ArcMap

TIN Aspect

摘要

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

插图

TIN Aspect illustration

用法

  • 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:

    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.

语法

TinAspect_3d (in_tin, out_feature_class, {class_breaks_table}, {aspect_field})
参数说明数据类型
in_tin

The input TIN.

TIN Layer
out_feature_class

The output feature class.

Feature Class
class_breaks_table
(可选)

An input table containing the classification breaks that will be used to classify the output feature class.

Table
aspect_field
(可选)

The field containing aspect values.

String

代码示例

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.CheckOutExtension("3D")
gp.workspace = "C:/data"
gp.TinAspect_3d("tin", "aspect.shp")

环境

许可信息

  • ArcGIS Desktop Basic: 需要 3D Analyst
  • ArcGIS Desktop Standard: 需要 3D Analyst
  • ArcGIS Desktop Advanced: 需要 3D Analyst