Create Low And High Spots (Defense Mapping)
Summary
Esri Defense Mapping cartographic production tool that finds the high and low spot heights for each feature in an input area of interest. Spot heights are appended to a Defense Mapping feature class.
Usage
The Input Area of Interest must have an NRN field. The NRN field uniquely identifies an area of interest within the Input Area of Interest features.
NoData cells in Input Rasters will not be used in the calculation on high and low spots.
Spot heights are written to the ZVH field in Input Spot Height Features.
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This tool uses tools from the Spatial Analyst extension.
Syntax
| Parameter | Explanation | Data Type |
Input_Area_of_Interest |
A feature layer that describes the processing extent. This tool computes high and low spot heights for each feature in the feature layer. You can select features in this feature layer to limit the processing area. | Feature Layer |
Input_Rasters [Input_Rasters,...] |
These rasters are used to determine high and low values within an area of interest. If you specify more than one raster, all input rasters must have the same bit depth and number of bands. | Raster Layer |
Input_Spot_Height_Features |
An existing Defense Mapping point feature layer to which the tool appends spot heights. | Feature Layer |
Spot_Height_Subtype (Optional) |
An existing subtype in Input Spot Height Features. The tool adds spot heights to this subtype. | String |
Code Sample
The following code example demonstrates how to execute the CreateLowAndHighSpots function.
# set gp environment
arcpy.env.workspace="c:/data"
arcpy.env.addOutputsToMap = True
# local variables
areaOfInterest = "C:/Program Files (x86)/ArcGIS/EsriDefenseMapping/Desktop10.1/ReferenceData/MapIndex.mdb/MapIndex/TLM100_Index"
areaOfInterestLyr="TLM100IDX"
whereclause="NRN='V695X1856'"
# raster N35.DT2 is located in c:/data/W121
raster="W121/N36.DT2"
rasterLyr="n36"
spotHeightFeatures="defense.gdb/Features/ElevP"
spotHeightFeaturesLyr="ElevPLyr"
heightSubtype="SpotElevationPoint"
# make a feature layer from area of interest and spot heights
arcpy.MakeFeatureLayer_management(spotHeightFeatures,spotHeightFeaturesLyr)
arcpy.MakeRasterLayer_management(raster,rasterLyr)
arcpy.MakeFeatureLayer_management(areaOfInterest,areaOfInterestLyr)
arcpy.SelectLayerByAttribute_management(areaOfInterestLyr,"NEW_SELECTION",whereclause)
# execute the CreateLowAndHighSpots_defense tool
arcpy.CreateLowAndHighSpots_defense(areaOfInterestLyr,raster,spotHeightFeaturesLyr,heightSubtype)