Store and display feature collections #2154
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Geometry type entries are for displaying individual or multi geometries. Feature collections however need to be displayed as a vector layer. An archipelago is a good example for a multi geometry. A series of n drivetime catchments is not a multigeometry but a feature collection since each band is a feature with own properties. Breaking a feature collection into features to be passed to a vector layer is not hard. Difficulties arise when trying to store feature collections in a relational database. It is not feasible to create a table for each feature which has an associated feature collection. Neither is it recommended to create a table with n columns, with a column each representing a distinct feature geometry. A geojson feature collection as a format for vector layers would solve the storage issue. A feature collection is a geojson standard. A feature collections can be read from a file. A feature collection can be stored in a JSON type PostGIS table field. |
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