ER Viewer - Earth Resources Mapping

Hi
Its actually just an image viewing program (whether the images are from/for GIS or not) - you cant do much with it, though it is handy for cropping images (and retaining georeferencing info) and for converting between a few image formats...I suspect most would just use it for looking at ecw files...but OziExplorer (and a range of other image viewing type programs now have ecw plugins for this purpose)

From the http://www.ermapper.com website...

ER Viewer is an easy to use image viewer featuring interactive roaming and zooming with very large image files. A wide range of image formats are supported:

From version 7.0,
ER Viewer supports JPEG 2000 files
ER Mapper ECW v2.0 compressed imagery
Universal Data Format (UDF) images
ER Mapper images
TIFF and GeoTIFF images
SPOT View images
ESRI BIL (ARC/INFO and ArcView) images
Smart Data ER Mapper algorithms

Cheers
Greg