Note: as of 1/23/96, the information previously on this page is obsolete.

Given digital contour lines, spot elevations, and streams, we want

The topogrid module of ARC/INFO, which is an implementation of the ANUDEM package, should take streams into account in building a digital elevation model. We have not been pleased with the results. We are consulting with the ANU people to see if we need to adjust our parameters, or if there are problems in the implementation of the algorithm. Topogrid can be forced to behave better if streams are used to create point coverages to further constrain to DEM construction.

In any case, it is often important to have the most accurate values for stream slopes, and that must be done using vector files of streams and contour lines. We have macros that