Calculate Bridge Overrides (Defense Mapping)

License Level:BasicStandardAdvanced

Summary

Calculates the overrides necessary to properly display bridge representations at a given location.

Overrides can be calculated for either line or point bridge features. For a line bridge feature, an override will be calculated for the width of a bridge representation based on the overpassing feature representation that runs through the bridge.

For point bridges, overrides include

Usage

Syntax

CalculateBridgeOverrides_defense (in_bridge_features, in_overpassing_features, reference_scale, {search_dist}, {expand}, {offset}, {min_length}, {bridge_subtype}, {overpassing_subtype})
ParameterExplanationData Type
in_bridge_features
in_bridge_features

The feature layer that contains the bridge features on which the overrides are calculated.

Layer
in_overpassing_features
in_overpassing_features

The feature layer that contains the features overpassing the bridges.

Layer
reference_scale

Defines the scale at which symbols appear at their intended size.

Long
search_dist
(Optional)

This is the distance by which this tool will buffer point bridge features when identifying the overpassing features, calculated in map units. This parameter is only available for point bridges. The default value is 0 meters.

Linear unit
expand
(Optional)

Indicates whether or not this tool considers marker layers on overpassing representations when analyzing widths.

  • NO EXPANDDoes not consider marker layers on overpassing representations. This is the default.
  • EXPANDConsiders marker layers on overpassing representations when analyzing widths.
Boolean
offset
(Optional)

The optional value that can be added to the bridge width override. The default value is 0 points.

Linear unit
min_length
(Optional)

The optional value that sets the minimum length of a line bridge. The default value is 1.35 millimeters.

Linear unit
bridge_subtype
(Optional)

The subtype of the feature class from the in_bridge_features parameter that will be modified by this operation.

String
overpassing_subtype
(Optional)

The subtype of the feature class in the in_overpassing_features parameter that will be used in this operation.

The subtype of the feature class in the Overpassing Features With Representations parameter that will be used in this operation.

String

Code Sample

CalculateBridgeOverrides example (stand-alone Python script)
# Name: CalculateBridgeOverrides_Example.py
# Description: Calculates the overrrides to display bridges properly at a location
# Requirements: Esri Defense Mapping solution

# Import arcpy module
import arcpy
from arcpy import env

# Check out a DefenseMapping extension license
arcpy.CheckOutExtension("defense")

# Set Cartography environment settings
env.cartographicCoordinateSystem = "GEOGCS['GCS_WGS_1984',DATUM['D_WGS_1984',SPHEROID['WGS_1984',6378137.0,298.257223563]],PRIMEM['Greenwich',0.0],UNIT['Degree',0.0174532925199433]]"
env.referenceScale = "10000"

# Local variables:
inBridgeFeatures = "C:/Data/Layers/Bridge.lyr"
inOverpassingFeatures = "C:/Data/Layers/Railroad.lyr"
refScale="1000"

# Execute Calculate Bridge Overrides function
arcpy.CalculateBridgeOverrides_defense(inBridgeFeatures, inOverpassingFeatures, refScale)

# Check in the Defense Mapping extension
arcpy.CheckInExtension("defense")

Environments

Related Topics

Licensing Information

ArcGIS for Desktop Basic: No
ArcGIS for Desktop Standard: Requires Defense Mapping
ArcGIS for Desktop Advanced: Requires Defense Mapping
9/2/2013