Surface Aspect (3D Analyst)

ArcGIS Pro 3.4 | | Help archive

Summary

Creates polygon features that represent aspect measurements derived from a TIN, terrain, or LAS dataset surface.

Illustration

TIN Aspect illustration

Usage

  • 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:

    CodeSlope DirectionSlope 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:

    BreakAspect_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

LabelExplanationData Type
Input Surface

The TIN, terrain, or LAS dataset surface that will be processed.

LAS Dataset Layer; Terrain Layer; TIN Layer
Output Feature Class

The feature class that will be produced.

Feature Class
Class Breaks Table
(Optional)

A table containing the classification breaks that will be used to define the aspect ranges in the output feature class.

Table
Aspect Field
(Optional)

The field containing aspect code values.

String
Pyramid Level Resolution
(Optional)

The z-tolerance or window-size resolution of the terrain pyramid level that will be used. The default is 0, or full resolution.

Double

Licensing information

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

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