# Surface Length (3D Analyst)

## 摘要

Calculates the surface length for each polyline or polygon feature based on a raster, triangulated irregular network (TIN), or terrain dataset surface.

The surface length information is stored as an attribute of the input feature class.

## 用法

• Use a smaller sampling distance to increase the accuracy of the surface length calculations.

• Use {out_length_field} to give the length field a custom name.

• Only polyline and polygon feature classes are valid inputs for this tool.

## 语法

SurfaceLength_3d (in_surface, in_feature_class, {out_length_field}, {sample_distance}, {z_factor}, {method}, {pyramid_level_resolution})
 参数 说明 数据类型 in_surface The input raster, TIN, or terrain dataset whose values will be used for interpolation. TIN layer; raster layer; terrain lLayer in_feature_class The input polygon or polyline feature class. Feature layer out_length_field(可选) The name of the attribute field to contain the surface length. String sample_distance(可选) The surface spacing at which the length is calculated. By default, the sampling distance is the natural densification of a TIN or the cell size of a raster. Double z_factor(可选) The factor multiplied by input surface values to store new values in the length field. The Z factor is used to convert z-units to match x,y units. Double method(可选) The interpolation method. For raster surfaces, the only option is BILINEAR. Select LINEAR or NATURAL_NEIGHBORS. String pyramid_level_resolution(可选) 此工具将使用 terrain 金字塔等级的 z 容差或窗口大小分辨率。默认值为 0（z 容差），或全分辨率（窗口大小）。 Double

## 代码实例

SurfaceLength example 1 (Python window)

``````import arcgisscripting
gp = arcgisscripting.create()

gp.CheckOutExtension("3D")
gp.workspace = "C:/data"
gp.SurfaceLength_3d("elevation_tin", "lines.shp", "Length3D")
``````

## 许可信息

ArcGIS for Desktop Basic: 需要 3D Analyst
ArcGIS for Desktop Standard: 需要 3D Analyst
ArcGIS for Desktop Advanced: 需要 3D Analyst
5/10/2014