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eec1695eb8
Line 5 : ST_TOUCHES should be ST_Touches. Other functions also were changed to lower case (i.e. ST_CONTAINS, ST_ CROSSES to ST_Contains, ST_Crosses)
60 lines
2.6 KiB
Plaintext
60 lines
2.6 KiB
Plaintext
{
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"name": "overlay_touches",
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"type": "function",
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"groups": ["GeometryGroup"],
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"description": "Returns whether the current feature spatially touches at least one feature from a target layer, or an array of expression-based results for the features in the target layer touched by the current feature.<br><br>Read more on the underlying GEOS \"Touches\" predicate, as described in PostGIS <a href='https://postgis.net/docs/ST_Touches.html'>ST_Touches</a> function.",
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"arguments": [
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{
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"arg": "layer",
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"description": "the layer whose overlay is checked"
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},
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{
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"arg": "expression",
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"description": "an optional expression to evaluate on the features from the target layer. If not set, the function will just return a boolean indicating whether there is at least one match.",
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"optional": true
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},
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{
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"arg": "filter",
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"description": "an optional expression to filter the target features to check. If not set, all the features will be checked.",
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"optional": true
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},
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{
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"arg": "limit",
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"description": "an optional integer to limit the number of matching features. If not set, all the matching features will be returned.",
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"optional": true
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},
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{
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"arg": "cache",
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"description": "set this to true to build a local spatial index (most of the time, this is unwanted, unless you are working with a particularly slow data provider)",
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"optional": true,
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"default": "false"
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}
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],
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"examples": [
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{
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"expression": "overlay_touches('regions')",
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"returns": "true if the current feature spatially touches a region"
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},
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{
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"expression": "overlay_touches('regions', filter:= population > 10000)",
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"returns": "true if the current feature spatially touches a region with a population greater than 10000"
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},
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{
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"expression": "overlay_touches('regions', name)",
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"returns": "an array of names, for the regions touched by the current feature"
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},
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{
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"expression": "string_to_array(overlay_touches('regions', name))",
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"returns": "a string as a comma separated list of names, for the regions touched by the current feature"
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},
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{
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"expression": "array_sort(overlay_touches(layer:='regions', expression:=\"name\", filter:= population > 10000))",
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"returns": "an ordered array of names, for the regions touched by the current feature and with a population greater than 10000"
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},
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{
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"expression": "overlay_touches(layer:='regions', expression:= geom_to_wkt($geometry), limit:=2)",
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"returns": "an array of geometries (in WKT), for up to two regions touched by the current feature"
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}
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]
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}
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