Doesn anyone else have TIFF tags for geographic information?
Both ESRI and Intergraph have been involved in the GeoTIFF definition since the inception of GeoTIFF and have released softwares which support the open GeoTIFF tag structure. ESRI has a history of using a private tag which Arc/Info uses to support image placement. This tag is basically a simple tag implementation of their WORLD file on a TIFF tag, internal to the TIFF format file. ESRI prefers to keep this tag private. GeoTIFF tags do everything ESRI’s tag could do and a lot more. Intergraph also has a tag set which they have used for several years to support their raster geographic softwares. This set is completely private since they reserve the right to change any of its structure at any time without review or notification outside of their user base. There are many many other TIFF private tagsets, as well as private “IFD’s” (image file directories) which can exist transparently within the TIFF structure. But only GeoTIFF is known to the public domain and supports geographic parameter
