mirror of
https://github.com/gnss-sdr/gnss-sdr
synced 2025-08-30 09:27:58 +00:00
skyplot improvements
Add new --format optional argument. Allowed options: pdf, eps, png, svg. Default: pdf Add new --version / -v optional arguments, show program version and exit Improve --help / -h message Improve error handling Generate PDF files with embedded fonts, ready for journal submission Improve argument handling Improve documentation Add explicit z-order control for cleaner display of labels in multiconstellation files
This commit is contained in:
Carles Fernandez
@@ -16,18 +16,19 @@ showing satellite visibility over time.
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## Features
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- Processes RINEX navigation files.
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- Calculates satellite positions using broadcast ephemeris.
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- Plots satellite tracks in azimuth-elevation coordinates.
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- Customizable observer location.
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- Color-codes satellites by constellation (GPS, Galileo, GLONASS, BeiDou).
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- Elevation mask set to 5°, configurable via the `--elev-mask` option.
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- Outputs high-quality image in PDF format. EPS, PNG, and SVG formats are also
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available via the `--format` option.
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- Non-interactive mode for CI jobs with the `--no-show` option.
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- Constellations to plot can be configured via the `--system` option.
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- Optionally uses an OBS file to limit plot to the receiver observation time
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(`--use-obs`).
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- When enabled, the tool looks for a matching file by replacing the last
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character of the NAV filename with O/o and uses it if found.
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- Calculates satellite positions using broadcast ephemeris.
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- Plots satellite tracks in azimuth-elevation coordinates.
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- Elevation mask set to 5°, configurable via the `--elev-mask` flag.
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- Color-codes satellites by constellation (GPS, Galileo, GLONASS, BeiDou).
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- Constellations to plot can be configured via the `--system` flag.
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- Customizable observer location.
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- Outputs high-quality image in PDF format.
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- Non-interactive mode for CI jobs (with `--no-show` flag).
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character of the NAV filename with `O`/`o` and uses it if found.
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## Requirements
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@@ -41,21 +42,27 @@ showing satellite visibility over time.
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### Basic Command
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```
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./skyplot.py <RINEX_FILE> [LATITUDE] [LONGITUDE] [ALTITUDE] [--use-obs] [--elev-mask] [--system ...] [--no-show]
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./skyplot.py <RINEX_FILE> [LATITUDE] [LONGITUDE] [ALTITUDE]
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[--elev-mask ELEV_MASK]
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[--format {pdf,eps,png,svg}]
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[--no-show]
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[--system SYSTEM [SYSTEM ...]]
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[--use-obs]
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```
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### Arguments
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| Argument | Type | Units | Description | Default |
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| ---------------- | -------- | ----------- | ---------------------- | -------- |
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| `RINEX_NAV_FILE` | Required | - | RINEX nav file path | - |
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| `LATITUDE` | Optional | degrees (°) | North/South position | 41.275°N |
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| `LONGITUDE` | Optional | degrees (°) | East/West position | 1.9876°E |
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| `ALTITUDE` | Optional | meters (m) | Height above sea level | 80.0 m |
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| `--use-obs` | Optional | - | Use RINEX obs data | - |
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| `--elev-mask` | Optional | degrees (°) | Elevation mask | 5° |
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| `--system` | Optional | - | Systems to plot | All |
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| `--no-show` | Optional | - | Do not show plot | - |
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| Argument | Type | Units | Description | Default |
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| ---------------- | -------- | ----------- | ------------------------ | -------- |
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| `RINEX_NAV_FILE` | Required | - | RINEX nav file path | - |
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| `LATITUDE` | Optional | degrees (°) | North/South position | 41.275°N |
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| `LONGITUDE` | Optional | degrees (°) | East/West position | 1.9876°E |
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| `ALTITUDE` | Optional | meters (m) | Height above sea level | 80.0 m |
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| `--elev-mask` | Optional | degrees (°) | Elevation mask | 5° |
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| `--format` | Optional | - | Output {pdf,eps,png,svg} | pdf |
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| `--no-show` | Optional | - | Do not show plot | - |
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| `--system` | Optional | - | Systems to plot | All |
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| `--use-obs` | Optional | - | Use RINEX obs data | - |
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### Examples
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@@ -84,6 +91,10 @@ showing satellite visibility over time.
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```
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./skyplot.py brdc0010.22n -33.4592 -70.6453 520.0 --system G E
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```
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- Get a PNG file:
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```
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./skyplot.py brdc0010.22n -33.4592 -70.6453 520.0 --format png
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```
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## Output
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@@ -91,8 +102,12 @@ The script generates a PDF file named `skyplot_<RINEX_FILE>.pdf` (with dots in
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`<RINEX_FILE>` replaced by `_`) with:
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- Satellite trajectories over all epochs in the file.
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- NAV file - ephemeris time range (default)
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- Receiver observation if `--use-obs` is specified and OBS file is found
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- NAV file - ephemeris time range (default).
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- Receiver observation if `--use-obs` is specified and OBS file is found.
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- Color-coded by constellation.
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- Observer location in title.
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- Time range in footer.
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- Embedded fonts that display consistently across all systems and generate
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publication-ready figures.
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- EPS, PNG, and SVG output formats available via `--format eps`, `--format png`,
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and `--format svg`.
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@@ -2,10 +2,17 @@
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"""
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skyplot.py
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Reads a RINEX navigation file and generates a skyplot. Optionally, a RINEX observation file can
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also be read to match the skyplot to the receiver processing time.
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Reads a RINEX navigation file and generates a skyplot. Optionally, a RINEX
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observation file can also be read to match the skyplot to the receiver
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processing time.
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Usage: python skyplot.py <RINEX_NAV_FILE> [observer_lat] [observer_lon] [observer_alt] [--use-obs]
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Usage:
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skyplot.py <RINEX_NAV_FILE> [observer_lat] [observer_lon] [observer_alt]
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[--elev-mask ELEV_MASK]
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[--format {pdf,eps,png,svg}]
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[--no-show]
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[--system SYSTEM [SYSTEM ...]]
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[--use-obs]
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-----------------------------------------------------------------------------
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@@ -25,9 +32,15 @@ from datetime import datetime, timedelta
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from math import atan2, cos, sin, sqrt
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from pathlib import Path
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import matplotlib.pyplot as plt
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import numpy as np
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try:
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import matplotlib.pyplot as plt
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import numpy as np
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except ImportError:
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print("Error: This script requires matplotlib and numpy.")
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print("Install them with: pip install matplotlib numpy")
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sys.exit(1)
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__version__ = "1.0.0"
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def _read_obs_time_bounds(obs_path):
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"""Return (start_time, end_time) from a RINEX 2/3 OBS file by scanning epoch lines.
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@@ -360,9 +373,15 @@ def ecef_to_az_el(x, y, z, obs_lat, obs_lon, obs_alt):
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def plot_satellite_tracks(satellites, obs_lat, obs_lon, obs_alt,
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footer_text=None, filename=None,
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show_plot=True, start_time=None,
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end_time=None, elev_mask=5.0):
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end_time=None, elev_mask=5.0,
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output_format="pdf"):
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"""Plot trajectories for all visible satellites"""
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plt.rcParams["font.family"] = "Times New Roman"
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plt.rcParams['pdf.fonttype'] = 42 # TrueType fonts
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plt.rcParams['ps.fonttype'] = 42 # TrueType fonts
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plt.rcParams['font.family'] = 'serif'
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plt.rcParams['font.serif'] = ['Times New Roman', 'Times', 'DejaVu Serif']
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plt.rcParams['mathtext.fontset'] = 'dejavuserif' # For math text
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plt.rcParams['svg.fonttype'] = 'none' # Make SVG text editable
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fig = plt.figure(figsize=(8, 8))
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ax = fig.add_subplot(111, projection='polar')
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ax.tick_params(labelsize=16, pad=7)
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@@ -442,13 +461,13 @@ def plot_satellite_tracks(satellites, obs_lat, obs_lon, obs_alt,
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for az_seg, el_seg in segments:
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theta = np.radians(az_seg)
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r = 90 - np.array(el_seg)
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ax.plot(theta, r, '-', color=color, alpha=0.7, linewidth=2.5)
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ax.plot(theta, r, '-', color=color, alpha=0.7, linewidth=2.5, zorder=1)
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# Arrow at end
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if len(theta) >= 2:
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dx = theta[-1] - theta[-2]
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dy = r[-1] - r[-2]
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arrow_length_factor = 1.3
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arrow_length_factor = 1.8
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extended_theta = theta[-2] + dx * arrow_length_factor
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extended_r = r[-2] + dy * arrow_length_factor
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ax.annotate('',
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@@ -461,13 +480,15 @@ def plot_satellite_tracks(satellites, obs_lat, obs_lon, obs_alt,
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'linewidth': 1.5,
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'shrinkA': 0,
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'shrinkB': 0
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})
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},
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zorder=2)
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# Label at midpoint of the segment
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mid_idx = len(theta)//2
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ax.text(theta[mid_idx], r[mid_idx], prn,
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fontsize=12, ha='center', va='center',
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bbox={"facecolor": "white", "alpha": 0.8, "pad": 2})
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bbox={"facecolor": "white", "alpha": 0.8, "pad": 2},
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zorder=3)
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# Legend for present systems
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legend_elements = [
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@@ -503,11 +524,11 @@ def plot_satellite_tracks(satellites, obs_lat, obs_lon, obs_alt,
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if filename:
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filename_no_path = Path(filename).name
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filename_no_dots = filename_no_path.replace('.', '_')
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output_name = f"skyplot_{filename_no_dots}.pdf"
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output_name = f"skyplot_{filename_no_dots}.{output_format}"
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else:
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output_name = "skyplot.pdf"
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output_name = f"skyplot.{output_format}"
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plt.savefig(output_name, format='pdf', bbox_inches='tight')
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plt.savefig(output_name, format=output_format, bbox_inches='tight')
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print(f"Image saved as {output_name}")
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if show_plot:
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plt.show()
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@@ -517,177 +538,198 @@ def plot_satellite_tracks(satellites, obs_lat, obs_lon, obs_alt,
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def main():
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"""Generate the skyplot"""
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# Set system names and codes
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system_name_to_code = {
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'GPS': 'G',
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'GLONASS': 'R',
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'GALILEO': 'E',
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'BEIDOU': 'C',
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'QZSS': 'J',
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'IRNSS': 'I',
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'SBAS': 'S'
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}
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# Set up argument parser
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parser = argparse.ArgumentParser(
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description='Generate GNSS skyplot from RINEX navigation file',
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add_help=False
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)
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# Add the no-show flag
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parser.add_argument(
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'--no-show',
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action='store_true',
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help='Run without displaying plot window'
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)
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# Add the use-obs flag
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parser.add_argument(
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'--use-obs',
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action='store_true',
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help='Use corresponding RINEX observation file to bound the skyplot to the receiver time window'
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)
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# Add the elev-mask flag.
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parser.add_argument(
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'--elev-mask', type=float, default=5.0,
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help='Elevation mask in degrees for plotting satellite tracks (default: 5°)'
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)
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# Add the system flag.
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parser.add_argument(
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'--system',
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nargs='+',
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help='Only plot satellites from these systems (e.g., G R E or GPS Galileo GLONASS)'
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)
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# Parse known args (this ignores other positional args)
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args, remaining_args = parser.parse_known_args()
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# Handle help manually
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if '-h' in remaining_args or '--help' in remaining_args:
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print("""
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Usage: python skyplot.py <RINEX_FILE> [LATITUDE] [LONGITUDE] [ALTITUDE] [--use-obs] [--elev-mask] [--system ...] [--no-show]
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Example:
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python skyplot.py brdc0010.22n 41.275 1.9876 80.0 --use-obs --no-show --elev-mask=10 --system GPS Galileo
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""")
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sys.exit(0)
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if len(remaining_args) < 1:
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print("Error: RINEX file required")
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sys.exit(1)
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filename = remaining_args[0]
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# Default observer location (Castelldefels, Barcelona, Spain)
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obs_lat = np.radians(41.2750)
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obs_lon = np.radians(1.9876)
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obs_alt = 80.0
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# Override with command line arguments if provided
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if len(remaining_args) >= 4:
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try:
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obs_lat = np.radians(float(remaining_args[1]))
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obs_lon = np.radians(float(remaining_args[2]))
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if len(remaining_args) >= 5:
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obs_alt = float(remaining_args[3])
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except ValueError:
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print("Invalid observer coordinates. Using defaults.")
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# Read RINEX file
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print(f"Reading {filename}...")
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try:
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satellites = read_rinex_nav(filename)
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except FileNotFoundError:
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print(f"Error: File '{filename}' not found.")
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return
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# Set system names and codes
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system_name_to_code = {
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'GPS': 'G',
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'GLONASS': 'R',
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'GALILEO': 'E',
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'BEIDOU': 'C',
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'QZSS': 'J',
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'IRNSS': 'I',
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'SBAS': 'S'
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}
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if not satellites:
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print("No satellite data found in the file.")
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return
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# Set up argument parser
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parser = argparse.ArgumentParser(
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description='Generate a GNSS skyplot from a RINEX navigation file',
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epilog="Example: skyplot.py brdc0010.22n -33.4592 -70.6453 520.0 --format png --system G E --elev-mask 10 --no-show"
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)
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if args.system:
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systems_upper = set()
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for s in args.system:
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s_upper = s.upper()
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if s_upper in system_name_to_code:
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systems_upper.add(system_name_to_code[s_upper])
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else:
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systems_upper.add(s_upper) # Assume user passed the code
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# Positional arguments
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parser.add_argument(
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'filename',
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help='RINEX navigation file path'
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)
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satellites = {prn: eph_list for prn, eph_list in satellites.items() if prn[0].upper() in systems_upper}
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parser.add_argument(
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'lat', nargs='?', type=float, default=41.2750,
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help='Observer latitude in degrees (default: 41.275° N)'
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)
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parser.add_argument(
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'lon', nargs='?', type=float, default=1.9876,
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help='Observer longitude in degrees (default: 1.9876° E)'
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)
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parser.add_argument(
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'alt', nargs='?', type=float, default=80.0,
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help='Observer altitude in meters (default: 80.0 m)'
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)
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# Optional arguments
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parser.add_argument(
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'--elev-mask',
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type=float,
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default=5.0,
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help='Elevation mask in degrees for plotting satellite tracks (default: 5°)'
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)
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parser.add_argument(
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'--format',
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type=str,
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default="pdf",
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choices=["pdf", "eps", "png", "svg"],
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help='Output file format for plot (default: pdf)'
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)
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parser.add_argument(
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'--no-show',
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action='store_true',
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help='Run without displaying plot window'
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)
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parser.add_argument(
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'--system',
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nargs='+',
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help='Only plot satellites from these systems (e.g., G R E or GPS GLONASS Galileo)'
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)
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parser.add_argument(
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'--use-obs',
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action='store_true',
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help='Use corresponding RINEX observation file to bound the skyplot to the receiver time window'
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)
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parser.add_argument(
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"-v", "--version",
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action="version",
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version=f"%(prog)s {__version__}",
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help="Show program version and exit"
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)
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# Parse all arguments with full validation
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args = parser.parse_args()
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# Convert coordinates to radians
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obs_lat = np.radians(args.lat)
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obs_lon = np.radians(args.lon)
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obs_alt = args.alt
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filename = args.filename
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# Read RINEX file
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print(f"Reading {filename}...")
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try:
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satellites = read_rinex_nav(filename)
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except FileNotFoundError:
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print(f"Error: File '{filename}' not found.")
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return 1
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if not satellites:
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print(f"No satellites found for systems: {', '.join(sorted(systems_upper))}")
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return
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print("No satellite data found in the file.")
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return 1
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# Print summary information
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all_epochs = sorted(list(set(
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e['epoch'] for prn, ephemerides in satellites.items() for e in ephemerides
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)))
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print("\nFile contains:")
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print(f"- {len(satellites)} unique satellites")
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print(f"- {len(all_epochs)} unique epochs")
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print(f"- From {all_epochs[0]} to {all_epochs[-1]}")
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if args.system:
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systems_upper = set()
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for s in args.system:
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s_upper = s.upper()
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if s_upper in system_name_to_code:
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systems_upper.add(system_name_to_code[s_upper])
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else:
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systems_upper.add(s_upper) # Assume user passed the code
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# Calculate and print satellite counts by system
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system_counts = {}
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for prn in satellites:
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system = prn[0]
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system_counts[system] = system_counts.get(system, 0) + 1
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satellites = {prn: eph_list for prn, eph_list in satellites.items() if prn[0].upper() in systems_upper}
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print("\nSatellite systems found:")
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for system, count in sorted(system_counts.items()):
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system_name = {
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'G': 'GPS',
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'R': 'GLONASS',
|
||||
'E': 'Galileo',
|
||||
'C': 'BeiDou'
|
||||
}.get(system, 'Unknown')
|
||||
print(f"- {system_name} ({system}): {count} satellites")
|
||||
if not satellites:
|
||||
print(f"No satellites found for systems: {', '.join(sorted(systems_upper))}")
|
||||
return 1
|
||||
|
||||
# Generate the combined skyplot
|
||||
# Time window: OBS bounds if provided; else NAV span
|
||||
use_start, use_end = all_epochs[0], all_epochs[-1]
|
||||
if args.use_obs:
|
||||
tried = []
|
||||
obs_path = None
|
||||
stem = filename[:-1]
|
||||
# Print summary information
|
||||
all_epochs = sorted(list(set(
|
||||
e['epoch'] for prn, ephemerides in satellites.items() for e in ephemerides
|
||||
)))
|
||||
print("\nFile contains:")
|
||||
print(f"- {len(satellites)} unique satellites")
|
||||
print(f"- {len(all_epochs)} unique epochs")
|
||||
print(f"- From {all_epochs[0]} to {all_epochs[-1]}")
|
||||
|
||||
for s in ('O', 'o'): # Try uppercase then lowercase
|
||||
candidate = stem + s
|
||||
tried.append(candidate)
|
||||
if Path(candidate).exists():
|
||||
obs_path = candidate
|
||||
break
|
||||
# Calculate and print satellite counts by system
|
||||
system_counts = {}
|
||||
for prn in satellites:
|
||||
system = prn[0]
|
||||
system_counts[system] = system_counts.get(system, 0) + 1
|
||||
|
||||
if obs_path:
|
||||
obs_start, obs_end = _read_obs_time_bounds(obs_path)
|
||||
if obs_start and obs_end:
|
||||
use_start, use_end = obs_start, obs_end
|
||||
print(f"\nObservation window detected from {obs_path}: {use_start} → {use_end}")
|
||||
print("\nSatellite systems found:")
|
||||
for system, count in sorted(system_counts.items()):
|
||||
system_name = {
|
||||
'G': 'GPS',
|
||||
'R': 'GLONASS',
|
||||
'E': 'Galileo',
|
||||
'C': 'BeiDou'
|
||||
}.get(system, 'Unknown')
|
||||
print(f"- {system_name} ({system}): {count} satellites")
|
||||
|
||||
# Generate the combined skyplot
|
||||
# Time window: OBS bounds if provided; else NAV span
|
||||
use_start, use_end = all_epochs[0], all_epochs[-1]
|
||||
if args.use_obs:
|
||||
tried = []
|
||||
obs_path = None
|
||||
stem = filename[:-1]
|
||||
|
||||
for s in ('O', 'o'): # Try uppercase then lowercase
|
||||
candidate = stem + s
|
||||
tried.append(candidate)
|
||||
if Path(candidate).exists():
|
||||
obs_path = candidate
|
||||
break
|
||||
|
||||
if obs_path:
|
||||
obs_start, obs_end = _read_obs_time_bounds(obs_path)
|
||||
if obs_start and obs_end:
|
||||
use_start, use_end = obs_start, obs_end
|
||||
print(f"\nObservation window detected from {obs_path}: {use_start} → {use_end}")
|
||||
else:
|
||||
print(f"\nWarning: Could not read valid times from {obs_path}. Using NAV span instead.")
|
||||
else:
|
||||
print(f"\nWarning: Could not read valid times from {obs_path}. Using NAV span instead.")
|
||||
else:
|
||||
print(f"\nOBS file not found. Tried: {', '.join(tried)}. Using NAV span instead.")
|
||||
print(f"\nOBS file not found. Tried: {', '.join(tried)}. Using NAV span instead.")
|
||||
|
||||
# Ensure at least two samples with the default 5-minute step
|
||||
if (use_end - use_start) < timedelta(minutes=5):
|
||||
use_end = use_start + timedelta(minutes=5)
|
||||
# Ensure at least two samples with the default 5-minute step
|
||||
if (use_end - use_start) < timedelta(minutes=5):
|
||||
use_end = use_start + timedelta(minutes=5)
|
||||
|
||||
# Generate the combined skyplot
|
||||
print("\nGenerating skyplot...")
|
||||
footer = f"From {use_start} to {use_end} UTC"
|
||||
# Generate the combined skyplot
|
||||
print("\nGenerating skyplot...")
|
||||
footer = f"From {use_start} to {use_end} UTC"
|
||||
|
||||
plot_satellite_tracks(
|
||||
satellites,
|
||||
obs_lat,
|
||||
obs_lon,
|
||||
obs_alt,
|
||||
footer_text=footer,
|
||||
filename=filename,
|
||||
show_plot=not args.no_show,
|
||||
start_time=use_start,
|
||||
end_time=use_end,
|
||||
elev_mask=args.elev_mask
|
||||
)
|
||||
plot_satellite_tracks(
|
||||
satellites,
|
||||
obs_lat,
|
||||
obs_lon,
|
||||
obs_alt,
|
||||
footer_text=footer,
|
||||
filename=filename,
|
||||
show_plot=not args.no_show,
|
||||
start_time=use_start,
|
||||
end_time=use_end,
|
||||
elev_mask=args.elev_mask,
|
||||
output_format=args.format
|
||||
)
|
||||
except Exception as e:
|
||||
print(f"Error: {str(e)}")
|
||||
return 1
|
||||
|
||||
return 0
|
||||
|
||||
|
||||
if __name__ == "__main__":
|
||||
|
||||
Reference in New Issue
Block a user