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| GeoCommunity Mailing List |
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| Mailing List Archives |
| Subject: | Re: GISList: LINE OF SIGHT ANALYSIS. |
| Date: |
08/28/2002 08:58:40 AM |
| From: |
Peter H. Van Demark |
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Santosh:
>I need some information on LINE OF SIGHT ANALYSIS.
>Is anybody aware of this? What is it?
>Where is it used and how is it done?
>I hope that isn't too much.
Line of sight (or visibility) analysis determines what can be seen on a
surface from a point on or above that surface. Maptitude, in its Surface
Analysis commands, lets you first create a surface from regular or
irregular XYZ points or a Digital Elevation Model. To get you started,
Maptitude includes a 5-arc-minute world DEM.
Then you click on a point, type in a height above the surface (which can be
0), and give a name for a new area geographic file that is created and
added as a layer in your map. It has a visible area (which might be quite
complex) and a non-visible area (which covers the remainder of the map):
the latter is crosshatched using a Pattern theme to highlight the area that
is visible.
You can get more information on Maptitude at
(http://www.caliper.com/maptovu.htm) and a color brochure at
(http://www.caliper.com/PDFs/Maptitude45Brochure.PDF).
Peter
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Peter Van Demark
Director of GIS Products and Training Phone: 617-527-4700
Caliper Corporation Fax: 617-527-5113
1172 Beacon Street E-mail: peter@caliper.com
Newton MA 02461-9926 Web site: http://www.caliper.com
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