which is geographically correct for the proposed tagset?
The images should be pre-corrected to a standard map projection, such as UTM, StatePlane, an international grid coordinate system (such as “British NationalGrid”, or “Nigeria East Belt” or similar). Geotiff-savvy TIFF readers can then use the geotie tags to place the image (say a satellite image) into the correct position in the GIS display. For SPOT’s products (called our SPOTView product line) the images will be accurate within 12 meters horizontal anywhere in the USA (a looser spec prevails in most international SPOTViews). Images which are not georeferenced to a map projection can still be entered into a GeoTIFF format but with some compromises on precision/accuracy of placement.
