Writer Notes

There are two separate and distinct methods to create elements:

Has Raster Geometry	Remarks
No	If the feature has no geometry, and has the Icon and LatLonBox element attributes specified, the writer will directly write the <GroundOverlay> element without performing any further operations.
Yes	The writer can handle the raster geometry be either directly writing the raster geometry using either the GEOTIFF or JPEG writers, or the writer can merely copy or reference the original raster source file. Directly writing the raster geometry is preferable, and is the default behaviour.

Notes

If the “copy” or “reference” modes are used, it is very important to ensure that the associated raster tile has a JPEG or TIFF format, and uses a LL84 coordinate system.

If the (default) “write” mode is used, the feature will be reprojected to the LL84 coordinate system using a raster reprojection, and then written using a FME raster writer.

The KML writer does not attempt to pre-process raster tiles so that they are suitable for writing to the selected output format. It may be necessary to manipulate the raster’s bands or palettes prior to writing.