ETG_RasterViewshed

Raster Viewshed

Calculates the visibility from a set of observer points to each of the cells of the output raster based on the input surface raster.

Input raster dataset representing the surface for which the analysis will be performed.
Output raster name and format
A point dataset (Observers). The attribute table can have a numeric field which values will indicate the offset of the observers above the terrain.
A field in the point feature class that will indicate the offset of the observer above the surface.
A number that will indicate the offset of the target above the surface.
Cutoff distance (optional) - how far an observer can see.
Options (see Line of Sight discussion

An integer raster. Each cell will have as a value the number of observers from which this cell is visible.

Viewshed from 5 observers symbolized with unique value - the number of observers that can see each cell.

Viewshed from 5 observers classified in 2 classes:

The input format accepted are file based rasters - ERDAS IMAGINE or Tagged Image File Format (TIFF).
The .NET ToolBox for ArcGIS Desktop accepts also FileGDB Raster inputs.
The smooth polylines option might be time consuming.
The input raster must have a projected coordinate system.

Parameters

Expression	Explanation
Function Name	RasterViewshed
<input raster>	A String representing the input raster dataset.
<output raster>	A String - the full name of the output raster.
<ObserversLayer>	A String - full path to the Observers point layer.
{OffsetField}	A String representing the name of the field which values are going to be used as offset of the observers above the raster.
{TargetOffset}	A Double indicating the offset of the target above the surface.
{CutoffDistance}	A Double representing the Cutoff distance.
{UseEarthCurvature}	A Boolean indicating whether the output to be Polyline or PolylineZ feature.
{RefractionCorrection}	A Double representing the air refraction coefficient - Default value = 0.13.
{RadioWavesCorrection}	A Double representing the radio waves correction coefficient - Default value = 1.333333.

ETSPath used in the table below is the full path to ETSRun.exe (E.G. "C:\Program Files\ETSpatial Techniques\ETSurface\ETSRun.exe")

ObserversLayer

Language	Syntax
Python	subprocess.call([ETSPath, "RasterViewshed", "input raster", "output raster", "ObserversLayer", "OffsetField", "TargetOffset", "CutoffDistance", "UseEarthCurvature", "RefractionCorrection", "RadioWavesCorrection"])
.NET using ETSRun.exe	StartInfo.FileName = ETSPath StartInfo.Arguments = "RasterViewshed" "input raster" "output raster" "ObserversLayer" "OffsetField" "TargetOffset" "CutoffDistance" "UseEarthCurvature" "RefractionCorrection" "RadioWavesCorrection"
.NET using ETSOutX.dll	RasterViewshed(input raster, output raster, ObserversLayer, OffsetField, TargetOffset, CutoffDistance, UseEarthCurvature, RefractionCorrection, RadioWavesCorrection)
ArcPy	arcpy.RasterViewshed("input raster", "output raster", "ObserversLayer", "OffsetField", "TargetOffset", "CutoffDistance", "UseEarthCurvature", "RefractionCorrection", "RadioWavesCorrection")

Notes:

<> - required parameter
{} - optional parameter
See examples for Python , .NET or ArcPy
The argument separator for StartInfo.Arguments is space. If a string might contain a space, you need to double quote it.