© M Visvalingam and JC Whelan, University of Hull, June 2001

Terrain Sketching for Visual Insights Inc.

Gettysburg Data - Core Cell Maps

500m tolerance for convex and concave.    This has more detail than necessary. Compare this with the modern map of Gettysburg to locate River Rock, the start of which is shown in blue at the bottom of the plot. 

wpeCE.jpg (96410 bytes)

Map with default tolerances as used in paper by Visvalingam and Dowson (1998 and 2001).  It is much easier to pick out the important features, e.g. Cemetry Ridge, Seminary Ridge etc   The network of rivers and the quarry East of River Rock also stand out better. 


wpeCF.jpg (71151 bytes)

Tolerances for sketch with 2m vertical displacement. 

        map.bmp (447898 bytes)

Page  by: Mahes Visvalingam,
                Cartographic Information Systems Research Group, University of Hull, UK