ETS_TINAspect

TIN Aspect

Calculates the aspect (compass direction of the slope) for each TIN Triangle. Groups the triangles based on their Aspect category and creates a polygon dataset with Aspect categories.

Inputs:

Input TIN dataset.
Output polygon dataset.
Class Breaks text file (optional).

Outputs:

New Polygon feature dataset.

Notes:

A new field ET_ACode will be added to the polygon attribute table. The values in this field will indicate the aspect groups.
Breaks file format - The file consist of lines with 2 comma delimited values. The first value is the break value and the second the Group ID. Valid break values are numbers between 0 and 360.0. The Group ID can be numeric or string, the only requirement is to be unique. The first value will define the first group, if for example the value is 30, the first group will be 0 to 30.
If no Class Breaks file is specified, the following default breaks will be used:
Default breaks in degrees
- N - North ( 0 to 22.5 and 337.5 to 360
- NE - North East (22,5 to 67.5)
- E - East (67.5 to 112.5)
- SE - South East (112.5 to 157.5)
- S - South (67.5 to 112.5)
- SW - South West (202.5 to 247.5)
- W - West (247.5 to 292.5)
- NW - North West (292.5 to 337.5)
- U - Undefined - Slope = 0

Example:

Output - default breaks:

Running Programmatically

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Parameters

Expression	Explanation
Function Name	TinAspect
<input tin>	A String representing the input TIN dataset.
<output dataset>	A String - the full name of the output polygon dataset.
{breaks file}	A String - the full path to the class breaks file.

Running the function

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

Language	Syntax
Python	subprocess.call([ETSPath, "TinAspect", "input tin", "output dataset", "breaks file"])
.NET using ETSRun.exe	StartInfo.FileName = ETSPath StartInfo.Arguments = "TinAspect" "input tin" "output dataset" "breaks file"
.NET using ETSOutX.dll	TinAspect(input tin, output dataset, breaks file)
ArcPy	arcpy.TinAspect("input tin", "output dataset", "breaks file")

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.

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