Bands From Raster (Production Mapping)
Récapitulatif
Creates an elevation bands feature class from a Digital Terrain Elevation Data (DTED) raster dataset. The resulting feature class is used by the Elevation Guide Bar surround element to display the high and low elevation areas on a Topographic Line Map (TLM) using a series of hypsometric gray bands.
There can be two, three, or four bands per map sheet. The number of bands that display will depend on the difference between the high and low elevation and the contour interval in the map sheet, with the following designations:
- Two bands—Low and High
- Three bands—Low, Medium, and High
- Four bands—Low, Medium, High, and Highest
Contour intervals can be 10, 20, or 40 meters by default. If no area of interest (AOI) features are selected, the bands will be calculated for the extent of the raster dataset.
Utilisation
If the area of interest (AOI) is spread across multiple raster dataset cells, you will have to specify all the cells.
The optional AOI feature class parameter is used to define the map extents.
The AOI field parameter must be the map sheet name or a unique identifier for each map sheet.
The Input Hydro Exclusion Features parameter (in_hydro_exclusion_feature in Python) is used for large water bodies and coastal areas that would significantly alter the area of the elevation bands.
Syntaxe
| Paramètre | Explication | Type de données |
in_raster |
The input raster dataset. | Raster Layer |
contour_interval |
Contour intervals with default value options of 10, 20, and 40. | Long |
out_feature_class |
The output elevation guide band feature class. | Feature Class |
in_aoi_features (Facultatif) |
The optional area of interest feature class to be used in lieu of the current data frame extent to define the map extents. | Feature Layer |
in_aoi_field (Facultatif) |
Field containing a unique identifier for each map sheet. | Field |
in_hydro_exclusion_features (Facultatif) |
Used to define large water body areas that need to be excluded from the elevation band area calculations. | Feature Layer |
Exemple de code
The following stand-alone script demonstrates how to use the BandsFromRaster tool.
# Name: BandsFromRaster_Example.py
# Description: Creates a raster and executes the BandsFromRaster tool.
# Requirements: Esri Production Mapping and Spatial Analyst
import arcpy
arcpy.CheckOutExtension("foundation")
# variables used by gp tools
cellSize='0.0005'
cellType="MAXIMUM_LENGTH"
contourField="elevation"
contourL = "TopographicMap/ContourL"
priorityFld='NONE'
raster = "contour_raster"
rasBnds = "raster_bands"
workspace="c:/data/Austin.gdb"
# set gp environment
arcpy.env.workspace=workspace
arcpy.env.overwriteOutput = True
# Bands from Raster requires a Raster - use the PolylineToRaster tool to
# create a raster from the Austin.gdb sample data
arcpy.PolylineToRaster_conversion(contourL,contourField, raster, cellType, priorityFld, cellSize)
# execute Bands From Raster using the contours raster
arcpy.BandsFromRaster_production(raster, "10", rasBnds)