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*** Award Winning Software *** |
Name: Surface Area and Ratio for ArcGIS (Click Name to Download)
Install File: surface_area.exe
Last Modified: July 8, 2009
View Online PDF Manual (requires Adobe Acrobat Reader)
Download Manual in A4 page size
Topics: Sphere, geodesic, great circle, surface, area, ratio, elevation, topography, roughness, convolution, convolutedness, rugosity, terrain, geomorphology
Author: Jeff Jenness
Wildlife Biologist, GIS Analyst
Jenness Enterprises
3020 N. Schevene Blvd.
Flagstaff, AZ, 86004 USA
(928) 607-4638
Description: This extension allows you to generate Surface Area and Surface Ratio rasters from an existing Elevation raster. The cell values for these new rasters reflect the surface area and (surface area) / (planimetric area) ratio for the land area contained within that cell's boundaries. Both Surface Area and Surface Ratio provide useful indices of topographic roughness and convolutedness, and can give a more realistic estimate of the land area available than you can get from the simple planimetric area.
This extension operates on both projected and
unprojected rasters, which must be analyzed differently because
of the fundamental difference in the measurement units of the coordinate
systems. These methods are described later in the manual, but this
extension will automatically detect the coordinate system of the raster
and use the method appropriate for that coordinate system.
Output: Three optional outputs:
 | A surface area raster, where each cell value reflects the total topographic surface area within that cell. |
| A surface ratio raster, where each cell value reflects the [surface area] / [planimetric area] ratio. |
| A planimetric area raster, where each cell value reflects the planimetric area within that cell. |
Recommended Citation Format: For those who wish to cite this extension, the author recommends something similar to:
Jenness, J. 2009. Surface Area and Ratio for ArcGIS (surface_area.exe). Jenness Enterprises. Available at: http://www.jennessent.com/arcgis/surface_area.htm.
Please let me know if you cite this extension in a publication. I will update the citation list to include any publications that I am told about.
Requires: ArcGIS 9.1 or better, at any license level. This extension has not been tested with ArcGIS 9.0, and I am sure it will not work with ArcGIS 8.x. This tool has only been tested on Windows 2000 and XP.
Important: This extension does not require Spatial Analyst or 3D Analyst. It will work just fine without any add-on extensions.
General Instructions:
This tool must be installed in the Windows registry before ArcGIS will recognize it. To install, double-click on the file “surface_area.exe” and follow the instructions.
For detailed instructions, view the on-line PDF version of
Surface Area and Ratio Manual
Revisions
Version 1.0
| Build 1.0.130 (July 7, 2009): Initial Release |
| Build 1.0.131 (July 8, 2009): Fixed web site address in "About" dialog. |
Enjoy! Please contact the author if you have problems or find bugs.
Jeff Jenness jeffj@jennessent.com
Jenness Enterprises http://www.jennessent.com
3020 N. Schevene Blvd.
Flagstaff, AZ 86004
USA
Please visit Jenness Enterprises ArcGIS Tools site for more ArcGIS tools and other software by the author. We also offer GIS consultation services for both ArcGIS and ArcView 3.x to help you meet your specific data analysis and application development needs.
