Renders the whole schema with metadata as a JSON string.
Renders all the extents in this RasterFrameLayer as GeoJSON in EPSG:4326.
Renders all the extents in this RasterFrameLayer as GeoJSON in EPSG:4326. This does a full table scan and collects **all** the geometry into the driver, and then converts it into a Spray JSON data structure. Not performant, and for debugging only.