Image mapping with the thematic mapper

Abstract

This paper deals principally with Landsat Thematic Mapper (TM) image maps as published by the U.S. Geological Survey (USGS). While other agencies have produced similar products, technical data thereon are not generally available. Landsat data have certain characteristics that make them suitable for conversion into image maps. These characteristics involve spatial resolution; geometric fidelity; and spectral response. By carefully controlled processing it is possible to publish TM multicolor-image maps of 1: 100,000 scale with suitable geometrics fidelity and informational content. Moreover, such image maps can be produced within a fraction of the time and cost of a conventional line map once the satellites data are obtained. This paper analyses the three mentioned characteristics and discusses the' processes involved in producing TM image maps.