However, to produce photo-like images, hybrid techniques require extensive libraries of tree and stand images that represent an appropriate range of species, tree sizes, growth forms, and landscape positions. Operators usually obtain the image from a satellite scene, aerial photograph, orthophoto, or map sheet and use techniques common to video imaging to modify the original image to reflect management activities. Several GIS and image processing applications provide draping capabilities. Most include rectification procedures to properly orient and align a digital image to the ground surface. Simple applications utilize orthophoto images that have already been registered to the ground surface and corrected for elevation, or relief, displacement.
Free packages are either public domain or otherwise freely available.
VistaPro does not provide for individual tree placement or specification of individual tree characteristics making it difficult to use to accurately representing a variety of stand conditions. This page includes references to commercial and non-commercial software products. Such references are for viewer information and do not imply endorsement by the U.S. Department of Agriculture of any product or service.