There many methods for displaying contour lines in visualization and GIS software programs. In most cases, representing terrain data with standard contours or hillshading techniques are sufficient. In other cases, you may want a more artistic technique to help emphasize specific features in the data or to make the map more pleasing to the eye. One of these techniques is using the Tanaka method for creating illuminated contours. I recently read an article about how to create illuminated contours in ArcGIS and couldn’t resist trying to replicate the results in Surfer's mapping software.
The Tanaka method applies a northwest light source to a contour map. The contour lines then change in color and width based on their relationship to the light source. Contour lines facing the light source are drawn in white while those in the shadow are drawn in black. The contour lines facing the light source (or facing away from it) are thicker, and the contour lines in the orthogonal direction are thinner. A more detailed explanation of the method can be found online at: http://www.mbmg.mtech.edu/pdf/gis_illum.pdf
Golden Software customers possess a broad assortment of backgrounds from earth sciences and engineering to education and politics. This vast background results in a variety of uses for Golden Software’s products. Each customer uses the software in a unique way, and we are pleased to share these stories. This blog features Dr. John Hall of the Geological Survey of Israel and his use of Surfer.
Dr. Hall is a marine geophysicist and doctoral graduate from Columbia University’s Lamont-Doherty Geological (now Earth) Observatory. Upon the completion of his doctorate, he worked for the Geological Survey of Israel until his retirement at the end of 2005. His research includes global tectonics, offshore geophysical surveys, and compilations of detailed gridded topography for Israel and neighboring areas. Although Dr. Hall is retired, he continues to utilize Golden Software’s own contouring, gridding, and 3D surface mapping program, Surfer.
Bernhard Hochwimmer is the Executive Director and Manager of Geology for Dart Mining NL based in Melbourne, Australia. Dart Mining NL is a base metal and gold exploration development company with many projects located in the northeastern section of the Victoria province. One such project of great interest is The Unicorn Project. Hochwimmer uses Surfer mapping software to create 2D and 3D geochemical maps of the region to be mined. These maps for the Unicorn Project are compiled utilizing some 1,312 soil, float and rock chip samples taken on 100 x100m grid intervals. By overlaying maps of different elemental geochemistry, Hochwimmer can estimate the mining potential within Mt. Unicorn (Figure 1). |
Users often combine Golden Software's mapping and griding software products to produce their final project. In the summer of 2007, a study was conducted by Dr. Richard Crawford of the Prince William Sound Science Center (PWSSC) in conjunction with the Valdez Fisheries Development Association to develop a tool to enhance the evaluation of fish abundance with their commercial-grade echo sounders. The goal was to maximize the harvesting of brood stock at the Solomon Gulch Hatchery. For their analysis, PWSSC used a combination of Surfer, Voxler, and Grapher to complete the study of Enhancing in-house assessment of pink salmon returns at Solomon Gulch Hatchery in Alaska. See the full report for additional information.
Prince William Science Center, located in Cordova, Alaska.
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