JMap.Layer.Thematic.getById
Returns a specific layer thematic.
The JMap layer id
The thematic id
Error if no layer found for the id, if the layer is a layer group, or if the thematic doesn't exist.
// returns thematic id=3 of layer id=4JMap.Layer.Thematic.getById(4, 3) Copy
// returns thematic id=3 of layer id=4JMap.Layer.Thematic.getById(4, 3)
JMap.Layer.Thematic.getById
Returns a specific layer thematic.