mirror of
https://github.com/Jermolene/TiddlyWiki5
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77 lines
2.0 KiB
Plaintext
77 lines
2.0 KiB
Plaintext
title: $:/plugins/tiddlywiki/geospatial/docs
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! Macros
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!! `show-geojson` macro
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The `show-geojson` operator displays a GeoJSON object in a human-readable form.
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|!Parameter |!Description |
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|geojson |Text of GeoJSON object to display |
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```
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<$macrocall $name="show-geojson" geojson={{$:/geospatialdemo/features/us-states}}/>
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```
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! Filter Operators
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!! `geopoint` operator
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The `geopoint` operator converts separate latitude, longitude and (optionally) altitude numbers into a [[GeoJSON Point Feature]] that can be used with other geospatial primitives.
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The coordinates are specified as two or three operands:
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```
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[geopoint<latitude>,<longitude>,<attitude>]
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```
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Any operands that cannot be interpreted as a valid number will be interpreted as the value zero.
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For example:
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```
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<$text text={{{ [geopoint[51.751944],[-1.257778]] }}}/>
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```
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Returns:
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```
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{"type":"Feature","properties":{},"geometry":{"type":"Point","coordinates":[51.751944,-1.257778,0]}}
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```
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!! `geodistance` operator
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!! `geounion` operator
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The `geounion` operator calculates the union between two or more [[GeoJSON Polygon Features|GeoJSON Polygon Feature]].
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Each input list item is interpreted as a [[GeoJSON Polygon Feature Collection]] containing polygons. Any item that
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```
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[geounion[]]
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```
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etc for geointersect and geodifference
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!! `geolookup` operator
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!! `olc-decode` operator
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The `olc-decode` operator converts an [[OpenLocationCode|https://github.com/google/open-location-code]] shortcut into the [[GeoJSON Point Feature]] at its centre or the [[GeoJSON Polygon Feature]] representing the bounds of the area identified by the input code.
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```
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[olc-decode:bounds[9C3WQP2R+QV]]
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[olc-decode:point[9C3WQP2R+QVH]]
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```
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!! `olc-encode` operator
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The `old-encode` operator converts separate latitude, longitude and (optionally) altitude numbers into an [[OpenLocationCode|https://github.com/google/open-location-code]] shortcut code with a specified length.
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```
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[olc-encode[51.751944],[-1.257778]]
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[olc-encode[51.751944],[-1.257778],[11]]
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```
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