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Add geonearestpoint operator

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jeremy@jermolene.com
2023-04-04 21:49:22 +01:00
parent 28a33df91d
commit 2a19e20307
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18
plugins/tiddlywiki/geospatial/docs.tid
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@@ -53,6 +53,24 @@ The `geodistance` operator calculates the distance between two points in [[GeoJS
</$let>
```
!! `geonearestpoint` operator
The `geonearestpoint` operator determines the point in a list that is nearest to a target point. Each input list item is interpreted as a [[GeoJSON Point Feature]] comprising the candidate points. The target point is specified as the first operand in [[GeoJSON Point Feature]] format.
```
<$let
oxford={{{ [geopoint[51.751944],[-1.257778]jsonset[id],[Oxford]] }}}
winchester={{{ [geopoint[51.0632],[-1.308]jsonset[id],[Winchester]] }}}
new-york={{{ [geopoint[40.730610],[-73.935242]jsonset[id],[New York]] }}}
>
<$text text={{{ =[<oxford>] =[<winchester>] +[geonearestpoint<new-york>jsonget[id]] }}}/>,
<$text text={{{ =[<oxford>] =[[Not a point]] +[geonearestpoint<new-york>jsonget[id]] }}}/>,
<$text text={{{ =[[Not a point]] +[geonearestpoint<new-york>jsonget[id]] }}}/>
</$let>
```
!! `geounion` operator
The `geounion` operator calculates the union between two or more [[GeoJSON Polygon Features|GeoJSON Polygon Feature]].