DESCRIPTION: This extension allows you to calculate various surface and topographic characteristics for Point, Line or Polygon Themes that overlay a GRID or TIN surface:
** Point Themes: Calculate the X- and Y-Coordinates, the Slope, Aspect and Elevation, and the surface area, flat area and (surface/flat) area ratios within a circular area surrounding each point. Also calculate the minimum, maximum, mean and standard deviation of elevation values, and identify the high and low points, in that circular area.
** Line (or Polyline) Themes: Calculate the surface length, the flat length, and the (Surface Length)/(Flat Length) ratio of each line, the minimum slope, maximum slope and average slope of that line, and the start, end, minimum, maximum and average elevation, elevation range and absolute/cumulative elevation change of that line. You can also generate a point shapefile of the high and low points on that line.
** Elevational Profiles of Routes, including several tools to modify their appearance
** Polygon Themes: Calculate the surface area within polygons, the flat area and the (surface/flat) area ratio within polygons. You can also calculate the surface area and the land volume within each polygon that lies above and below a specified elevation. Finally, you can calculate the highest elevation, the lowest elevation, and the elevation range, mean and standard deviation within each polygon, and you can generate a shapefile of the high and low points within that polygon.
Use GRID or TIN elevation theme: You can use either a GRID or TIN as your elevation theme. If you use a GRID, then this extension will create a TIN of the relevant area and calculate surface and topographic data from the new TIN.
Save and clip TINs: CAUTION: A clipped TIN may not be exactly what you think it is. See the manual or online documentation for an explanation of what happens when a TIN is clipped.
REQUIRES: This extension requires the Spatial Analyst and 3D Analyst extensions, as well as a point, polyline or polygon theme and an elevation theme. The elevation theme can be either a GRID or a TIN, but it must completely encompass the features. If you are running AV 3.0a, you must download the Dialog Designer from ESRI at: http://support.esri.com/index.cfm?fa=downloads.patchesServicePacks.viewPatch&PID=25&MetaID=483
UPDATES: V. 1.6b (February 11, 2008) fixes a bug in which multiple coincident extreme points were generated (i.e. several Lowest Points, all at the same location). Now only one point feature will be generated for each unique location.
A full manual in Acrobat PDF format is included in the zip file and may be viewed on-line at:
http://www.jennessent.com/arcview/surface_tools.htm
For more ArcView Extensions and other software by the author, please visit the author’s software download page at:
http://www.jennessent.com/arcview/arcview_extensions.htm
Enjoy!
Jeff Jenness...
the complete description can be found in the readme.txt file included in the zipfile download. |
