TIN Aspect (3D Analyst)

Summary

Extracts the directional orientation of input TIN to an output polygon feature class.

Legacy:

This is a deprecated tool that has been superseded by the Surface Aspect tool.

Illustration

Usage

• Aspect is expressed in degrees.

• Aspect represents the horizontal orientation of a surface and is determined in units of degrees. Each facet of the surface is assigned a code value which represents the cardinal or ordinal direction of its slope, and contiguous areas with the same code are merged into one feature. The default classification scheme is defined as follows:

  Code	Slope Direction	Slope Angle Range
  -1	Flat	No Slope
  1	North	0° – 22.5°
  2	Northeast	22.5° – 67.5°
  3	East	67.5° – 112.5°
  4	Southeast	112.5° – 157.5°
  5	South	157.5° – 202.5°
  6	Southwest	202.5° – 247.5°
  7	West	247.5° – 292.5°
  8	Northwest	292.5° – 337.5°
  9	North	337.5° – 360°

• Customized class definitions can be provided through a Class Breaks Table. The table must have two columns where the first indicates the aspect break point in degrees and the second defines its code value. Consider the following example:

  Break	Aspect_Code
  90.0	1
  180.0	2
  270.0	3
  360.0	4

  The table can be in any supported format (.dbf, .txt, or geodatabase table). The name of the fields are irrelevant, as the first will always be used for the class breaks and the second for the aspect codes.

Parameters

Dialog

Label	Explanation	Data Type
Input TIN	The input TIN.	TIN Layer
Output Feature Class	The output feature class.	Feature Class
Class Breaks Table (Optional)	An input table containing the classification breaks that will be used to classify the output feature class.	Table
Aspect Field (Optional)	The field containing aspect values.	String

Python

arcpy.ddd.TinAspect(in_tin, out_feature_class, {class_breaks_table}, {aspect_field})

Name	Explanation	Data Type
in_tin	The input TIN.	TIN Layer
out_feature_class	The output feature class.	Feature Class
class_breaks_table (Optional)	An input table containing the classification breaks that will be used to classify the output feature class.	Table
aspect_field (Optional)	The field containing aspect values.	String

Code sample

TINAspect example (Python window)

The following Python Window script demonstrates how to use the TIN Aspectfunction in immediate mode.

import arcgisscripting
gp = arcgisscripting.create()

gp.workspace = "C:/data"
gp.TinAspect_3d("tin", "aspect.shp")

Environments

Current Workspace, Output XY Domain, Output Coordinate System, Extent, Scratch Workspace, XY Resolution, XY Tolerance

Licensing information

• Basic: Requires 3D Analyst
• Standard: Requires 3D Analyst
• Advanced: Requires 3D Analyst