I have about 600 GeoTIFF map files geo-referenced using New Zealand Transverse Mercator 2000 (NZTM2000). Each file is about 140 mb in size. I'd like to convert them to Garmin Custom Maps compatible KMZ files so people can download them and use them with Garmin GPS units.
Does anyone know a way to batch process these, preferably converting the tiff image to a much smaller jpeg image as part of the process? I'd prefer a tool that is free or donation based.
I've tried the method gdal_translate method provided as this answer https://gis.stackexchange.com/a/20936/1150 but unfortunately the KMZ files produced don't seem to be compatible with Garmin devices from the user feedback I've had. An example file produced using gdal_translate - https://dl.dropboxusercontent.com/u/48119/CB12-test.kmz
OkMap produces valid KMZ files but it lacks a useful batch processing option. OkMap also produces KMZ's that are much smaller that those produced through gdal_translate which is a nice bonus. Perhaps someone knows a technique / workaround I could use to automate OkMap not using the command line?