What file format is the CDL published in?
The purchasable official CD/DVD contains the CDL categorized imagery in two file formats: GeoTIFF (.tif) and ERDAS Imagine (.img). The GeoTIFF will have three files associated with it: .tif, .tfw, and .aux. The ERDAS Imagine format will have two files associated with it: .img and .rrd. The image legends are offered in a JPEG (.jpg) format. The metadata is offered in a HTML (.htm) format.
The CDL data is available in a GeoTIFF (.tif) file format. The GeoTIFF for a single CDL data layer will have three files associated with it: .tif, .tfw, and .aux. Older CDLs may also be available in an ERDAS Imagine (.img) file format. The Erdas Imagine file will have two files associated with it: .img and .rrd.