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View Shed Tool
Global Mapper User's Manual
The View Shed command selects the view shed analysis tool as the current tool. This tool allows registered
users to perform a view shed analysis using loaded elevation grid data with a user-specified transmitter
location, height, and radius. All areas within the selected radius that have a clear line of sight to the transmitter
are colored with a user-specified color.
To perform a view shed analysis, first select the view shed tool as your current tool. Press and release the left
mouse button at the position where you wish to place the transmitter. At this point, the View Shed Setup dialog
(pictured below) will appear, allowing you to setup the view shed calculation.
You can also calculate views sheds at multiple point locations by selecting the point features at the desired
locations in the Digitizer Tool, right clicking, then selecting the Calculate View Sheds at Selected Point(s)
option on the menu that is displayed.
If you choose to perform view shed operations at selected point feature locations, the view shed calculation
values will be initialized from attributes of that point feature. The values selected on the dialog will be used,
except when one of the following attributes is present with a value to override what was selected on the dialog
(this allows you to batch calculate view sheds at different locations with different parameters):
• OFFSETA - height above ground in meters (or feet if 'ft' in value) for transmitter (observation point)
• OFFSETA_MSL (or OFFSETA_MS if coming from a Shapefile) - height above sea level in meters
(or feet if 'ft' in value) for transmitter (observation point)
• OFFSETB - height above ground in meters (or feet if 'ft' in value) for receiver
• OFFSETB_MSL (or OFFSETB_MS if coming from a Shapefile) - height above sea level in meters
(or feet if 'ft' in value) for receiver
• AZIMUTH1 - start angle for view shed (0 is north, 90 is east, etc.)
• AZIMUTH2 - send angle for view shed (0 is north, 90 is east, etc.)
• RADIUS2 - outer radius in meters of view shed calculation
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