Create TLM Elevation Guide Bands from Features (Defense Mapping)
Summary
Creates banding features that can be used to generate the Elevation Guide Box element for a Topographic Line Map (TLM).
Usage
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It is recommended that you use contour lines that have been collected using meters.
The feature layers specified for the Contour Features and Additional Elevation Features parameters must all contain the field listed in the Elevation Field Name parameter.
The Elevation Units parameter value applies to all the feature layers specified for the Contour Features and Additional Elevation Features parameters.
The inclusion of additional elevation features allows the tool to fine-tune the output bands beyond what it can accomplish using contour lines alone.
When using exclusion feature classes, ensure that the exclusion feature class includes the proper elevation field and an elevation value of zero for each exclusion feature.
Syntax
| Parameter | Explanation | Data Type |
AOI_Feature_Class |
The area of interest for the TLM. This feature is typically stored in an index feature class. | Feature Layer |
Contour_Features |
The feature layer that contains the contours. The information for the output bands will be derived from these features. This must be a polyline feature class. | Feature Layer |
Contour_Interval |
The range in elevation (distance) between contour features. This must be 10, 20, 40, or 80. The default value is 20. | Long |
Elevation_Field_Name |
The field within the contour feature layer from which the elevation values will be derived. The default value for this is ZV2. | String |
Elevation_Units | The unit of measurement that has been used to collect the contours and additional elevation features.
| String |
Output_Feature_Class |
The feature class that will contain the banding features. The default name is TLM<scale>_CreateTLMElevationGuide. | Feature Class |
Additional_Elevation_Features (Optional) |
Feature layers that contain additional elevation information that can be used during band creation. | Feature Layer |
Exclusion_Features [Exclusion_Features,...] (Optional) |
Feature layers that define areas for processing exclusion. Excluded areas will not be taken into account when calculating the percent area ratio for the output bands. When excluding open water areas for coastal sheets, it is necessary to include these features as additional elevation features as well. | Feature Layer |
Code Sample
This Python example create elevation bands over a feature in the TLM index.
# CreateTLMElevationGuideBands.py
# Description: Create banding features from a single TLM feature
# Author: ESRI
# Date: April 2011
# Import arcpy module
import arcpy
# Check out a DefenseMapping extension license
arcpy.CheckOutExtension("foundation")
arcpy.CheckOutExtension("defense")
# Import the Defense Mapping toolbox - you may have to alter this path
arcpy.ImportToolbox(r'C:\Program Files\ArcGIS\Desktop10.0\ArcToolbox\Toolboxes\Defense Mapping Tools.tbx')
# set the Gp workspace environment
arcpy.env.workspace = r'c:\data\work.gdb'
#Create 2 feature layers for processing
arcpy.MakeFeatureLayer_management(r'C:\data\MapIndex.gdb\MapIndex\TLM100_Index','tlm_layer')
arcpy.MakeFeatureLayer_management(r'C:\data\work.gdb\contours','contours_layer')
# Select a single TLM feature
arcpy.SelectLayerByAttribute_management('tlm_layer',"NEW_SELECTION","NRN='V695X2453'")
# execute the tool - output will be written to the gp workspace
arcpy.CreateTLMElevationGuideBands_defense('tlm_layer','contours_layer',"20","zv2","Meters",'TlmGuideBands')
# Check in the extensions
arcpy.CheckInExtension("foundation")
arcpy.CheckInExtension("defense")