Just found out how to convert MrSID files (from NZ geology) to other formats using GDAL.
- Followed instructions here: http://www.photo-mark.com/notes/2008/nov/12/converting-mrsid-gis-files/
- Needed most recent version of GDAL with frameworks (1.8 Complete): http://www.kyngchaos.com/software/frameworks
- Had to change command to “/Library/Frameworks/GDAL.framework/Versions/Current/Programs/gdal_translate -of PNG /Users/Matt/Desktop/whangarei/inputmap.sid /Users/Matt/Desktop/whangarei/outputmap.png”
- That makes an image file, but I think I’ll convert to geotiff for GIS:
- /Library/Frameworks/GDAL.framework/Versions/Current/Programs/gdal_translate /Users/Matt/Desktop/whangarei/inputmap.sid /Users/Matt/Desktop/whangarei/outputmap.tif
- Map source: http://www.gns.cri.nz/Home/Our-Science/Energy-Resources/Geological-Mapping/Geological-Maps/1-250-000-QMAP/Map-downloads
- Map coordinate system: New Zealand Map Grid (Geodetic Datum 1949)
- gdal_translate man: http://www.gdal.org/gdal_translate.html