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How to add source in GeoJSON layer using PostGIS?
I am getting multiple row of MultiPolygon on which I want to add as a layer on map. But only the first array of layer is added and remaining all is not appearing.
How to add GeoJSON layer to OpenLayers 3?
When you define your vector source, put the projection setting pointing to the target coordinate reference system (see the docs ): Perhaps this resource can help you to see different ways to load vector data: http://acanimal.github.io/thebookofopenlayers3/chapter03_03_vector_source.html
How to generate a GeoJSON object in JavaScript?
The issue is to do with how I generate the geojson object, I’ve done this using a loop – something is not quite right with the final product.
How to load vector data in OpenLayers 3?
Perhaps this resource can help you to see different ways to load vector data: http://acanimal.github.io/thebookofopenlayers3/chapter03_03_vector_source.html FYI… I believe this has changed for OL3 V3.5.0, so gcarrillo’s answer would be:
Where can I find custom vector tiles in PostGIS?
You can combine OpenMapTiles with your custom vector data saved in PostGIS database (there is the separate article for data stored in ShapeFile or GeoJSON ). The easiest way is to convert your data into vector tiles and then combine it with standard OpenMapTiles source in a map style.
How to convert data into MBTiles in GeoJSON?
Having your data in correct coordinate system, you can do the conversion using tippecanoe. The most simple use case is: It will convert your data into MBTiles for zoom levels 0 to 14. Tippecanoe enables much more sophisticated options including layer and attribute management, dropping features, generalization, and more.
How to return the geometry as a GeoJSON?
ST_AsGeoJSON — Return the geometry as a GeoJSON element. text ST_AsGeoJSON( record feature, text geomcolumnname, integer maxdecimaldigits=9, boolean pretty_bool=false); Return the geometry as a GeoJSON “geometry” object, or the row as a GeoJSON “feature” object.
How to connect OpenLayers to PostGIS data?
In Javascript I define the data and styling => Javascript-function calls a php-script via GET to retrive data from Postgis => function styles the data to render in Openlayers 3. The whole sripts can be seen in Is there an easy way to use Postgis-geojson in Openlayers 3?
Is the maxdecimaldigits argument used in GeoJSON?
(Cf GeoJSON specifications RFC 7946 ). 2D and 3D Geometries are both supported. GeoJSON only support SFS 1.1 geometry types (no curve support for example). The maxdecimaldigits argument may be used to reduce the maximum number of decimal places used in output (defaults to 9).