Used by geotiff.Encoder to control how GeoTiff data is to be written.
Currently supports sample size, format and 'esriCompat', an ESRI
This compatibility option changes the way that geographic data are written.
The "normal" approach is similar to how GDAL and other strict GeoTIFF
encoders work (we write out the projected CS ID, i.e. 3857). If 'esriCompat'
is set to true, we instead write out a "user-defined" projected CS.