Use the KMLUnitsType enumeration (either via the KMLImageCoordinate.xUnits and KMLImageCoordinate.yUnits properties) to establish the KML image coordinate system. Values of type fraction must be between 0.0 and 1.0. Values below 0.0 will be set to 0.0, and values above 1.0 will be set to 1.0. If a non-integral number is specified with a unit type of pixels or insetPixels, it will be rounded down to a whole number (e.g. 2.243 will be rounded to 2.0).
The KmlUnitsType can be one of: