Keyhole dates back to 2001 and draws on several precursors, eg: ERMapper (Perth, Western Australia) which offered similar functionality in the 1990s - in addition to computational process pipelines for, say, warping and geomosaicing inputs, multi spectral filtering (adding and subtracting weighted bands to sharpen certain features, etc).
ER Mapper was the first software I dog fooded that transferred images without the dial up scan line by scan line top down process that existed to that point in time.
The same discrete wavelet transform (DWT) and variation techniques occurred to several entities at much the same time .. some US patent pettiness killed a lot of development for a couple of years from 1999 forward:
ER Mapper was the first software I dog fooded that transferred images without the dial up scan line by scan line top down process that existed to that point in time.
The same discrete wavelet transform (DWT) and variation techniques occurred to several entities at much the same time .. some US patent pettiness killed a lot of development for a couple of years from 1999 forward:
* https://en.wikipedia.org/wiki/LizardTech,_Inc._v._Earth_Reso....