Issues involving the creation of digital elevation models and terrain corrected orthoimagery using soft‐copy photogrammetry

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Abstract
Orthoimage maps are becoming the base maps for many geographic information systems. This paper first presents technological reasons why digital elevation models (DEMs) and orthoimagery databases are becoming so ubiquitous in our society based on improvements in 1) the collection of ground control, 2) the collection of high spatial resolution imagery, 3) image digitization technology, and 4) soft‐copy phtogrammetric hardware and software. The advantages and limitations of DEMs and orthoimages derived using soft‐copy techniques are identified. Recent advances in orthoimage creation are then presented. Users of these technologies are encouraged to take these observations into consideration when using DEMs and orthoimagery for earth resource management decision making.

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