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15 lines
1.5 KiB
Plaintext
15 lines
1.5 KiB
Plaintext
{
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"name": "layer_property",
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"type": "function",
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"description": "Returns a matching layer property or metadata value.",
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"arguments": [
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{"arg":"layer", "description":"a string, representing either a layer name or layer ID"},
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{"arg":"property", "description":"a string corresponding to the property to return. Valid options are:<br /><ul><li>name: layer name</li><li>id: layer ID</li><li>title: metadata title string</li><li>abstract: metadata abstract string</li><li>keywords: metadata keywords</li><li>data_url: metadata URL</li><li>attribution: metadata attribution string</li><li>attribution_url: metadata attribution URL</li><li>source: layer source</li><li>min_scale: minimum display scale for layer</li><li>max_scale: maximum display scale for layer</li><li>crs: layer CRS</li><li>crs_definition: layer CRS full definition</li><li>crs_description: layer CRS description</li><li>extent: layer extent (as a geometry object)</li><li>type: layer type, e.g., Vector or Raster</li><li>storage_type: storage format (vector layers only)</li><li>geometry_type: geometry type, e.g., Point (vector layers only)</li><li>feature_count: approximate feature count for layer (vector layers only)</li><li>path: File path to the layer data source. Only available for file based layers.</li></ul>"}
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],
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"examples": [
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{ "expression":"layer_property('streets','title')", "returns":"'Basemap Streets'"},
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{ "expression":"layer_property('airports','feature_count')", "returns":"120"},
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{ "expression":"layer_property('landsat','crs')", "returns":"'EPSG:4326'"}
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]
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}
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