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22 lines
948 B
Plaintext
22 lines
948 B
Plaintext
title: $:/plugins/tiddlywiki/geospatial/docs/geonearestpoint
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caption: geonearestpoint operator
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tags: $:/tags/GeospatialDocs
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!! `geonearestpoint` operator
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The `geonearestpoint` operator determines the point in a list that is nearest to a target point. Each input list item is interpreted as a [[GeoJSON Point Feature]] comprising the candidate points. The target point is specified as the first operand in [[GeoJSON Point Feature]] format.
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```
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<$let
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oxford={{{ [geopoint[51.751944],[-1.257778]jsonset[id],[Oxford]] }}}
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winchester={{{ [geopoint[51.0632],[-1.308]jsonset[id],[Winchester]] }}}
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new-york={{{ [geopoint[40.730610],[-73.935242]jsonset[id],[New York]] }}}
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>
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<$text text={{{ =[<oxford>] =[<winchester>] +[geonearestpoint<new-york>jsonget[id]] }}}/>,
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<$text text={{{ =[<oxford>] =[[Not a point]] +[geonearestpoint<new-york>jsonget[id]] }}}/>,
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<$text text={{{ =[[Not a point]] +[geonearestpoint<new-york>jsonget[id]] }}}/>
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</$let>
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```
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