TIN Slope
Open Table of Contents ToolBox Implementation
Calculates the slope of the TIN Triangles of the input ESRI TIN or PolygonZ TIN in percent or degrees (0 to 90). Categorizes the triangles and groups them based on the slope. The user can input a text file to be used for defining the groups to be created. If not such file is provided the default grouping will be used.

Inputs:

  • A ESRI TIN or PolygonZ TIN
  • Slope option
    • Percent
    • Degrees
  • Optional: Class Breaks text file

Outputs:

  • A polygon feature class 
  • A new field ET_SCode will be added to the polygon attribute table. The values in this field will indicate the slope groups.

Default breaks

Slope in degrees Slope in percents
  • 0 - 0.5
  • 0.5 - 1.5
  • 1.5 - 3.0
  • 3.0 - 6.0
  • 6.0 - 12.0
  • 12.0 - 25.0
  • 25.0 - 45.0
  • 45.0 - 90.0
  • 0 - 1.0
  • 1.0 - 2.0
  • 2.0 - 5.0
  • 5.0 -10.0
  • 10.0 -20.0
  • 20.0 - 50.0
  • 50.0 - 100.0
  • Above 100

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. 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 5, the first group will be 0 to 5. Example text file:

Break, Group
1, Flat
5,Low
10,Low To Moderate
25,Moderate
35,High		 The file on the left will produce 6 groups
0 - 1 Flat
1 - 5 Low
5 - 10 Low To Moderate
10 - 25 Moderate
25 - 35 High
> 35 Above High

ToolBox implementation

Command line syntax - two different toolbox tools available depending on the type of the input TIN. Check the color coding for specifics.

ETS_GPSlopeFromEsriTIN <Input TIN>  <Out Feature Class> <Slope Units> {Class Break File}
ETS_GPSlopeFromPolygonZTIN <Input TIN>  <Out Feature Class>  {Class Break File}

Parameters

Expression Explanation
<Input TIN> An ESRI TIN layer or dataset
<Input TIN> A PolygonZ TIN (feature class)
<Out Feature Class> A String - the full name of the output feature class.
<Slope Units> A String indicating the units to be used for slope. Valid values "Degree", "Percent"
{Class Break File} A String - the full name of the class breaks file.

Scripting syntax

ETS_GPSlopeFromEsriTIN (Input TIN, Out Feature Class, Slope Units, Class Break File)

ETS_GPSlopeFromPolygonZTIN (Input TIN, Out Feature Class, Slope Units, Class Break File)

See the explanations above:
<> - required parameter
{} - optional parameter

All ESRI products mentioned are trademarks of Environmental Systems Research Institute, Inc.
Copyright: Ianko Tchoukanski