HCA-MCA CALCULATION (METHOD 2)

Summary

HCA-MCA Calculation (Method 2) determines High Consequence Area (HCA) and Moderate Consequence Area (MCA) ranges by method 2 (the Potential Impact Radius (PIR) method, per 49 CFR §192.903(2)).

Usage

Input Structure and Site Segment Features – This tool uses as input the Building Intended for Human Occupancy (BIHO) and identified site segments created by the Prepare Structure and Site Buffer and Segments tool. Unless otherwise specified, the tool defaults this parameter to the HCA_STRUCTURESEGMENT feature class in your selected Gas HCA Tool project geodatabase.
Input Road PIR Segment Features – This tool uses as input the road PIR segments created using the Prepare Roads tool. Unless otherwise specified, the tool defaults this parameter to the ROAD_PIR_SEGMENTS feature class in your selected Gas HCA Tool project geodatabase.
Boundary Extension Method – The default ‘Arc Method’ is the method implied by 49 CFR §192 Appendix E.(I.) Figure A., and is strongly recommended.
Output HCA Range Features – This parameter defines the destination of the output HCA-MCA range features. Unless otherwise specified, the default destination for the output HCA-MCA range features is the HCA_RANGE_M2 feature class in your selected Gas HCA Tool project geodatabase.
Output HCA Segment Features – This parameter defines the destination of the output dynamically segmented HCA and MCA range features, which contain useful information, such as BIHO and identified site counts, and the provenance of the segment. Unless otherwise specified, the default destination for the output HCA-MCA segment features is the HCA_SEGMENT_COUNT_M2 feature class in your selected Gas HCA Tool project geodatabase.

In a typical HCA-MCA workflow, HCA-MCA Calculation (Method 2) follows Prepare Structure and Site Buffer and Segments and Prepare Roads and is the final process step in the workflow.

Syntax

HCAMethod2Tool_hcapy (project_database, {input_hca_structure_segments}, {input_road_pir_segments}, boundary_method, {hca_range}, {hca_count_out})

Parameter	Explanation	Data Type
project_database	Dialog Reference Select a Gas HCA Tool project geodatabase created using the Initialize Database tool. The output from this tool is stored in this workspace by default. There is no Python reference for this parameter.	Workspace
input_hca_structure_segments (Optional)	Dialog Reference Specify your input road BIHO and identified site PIR segment features. There is no Python reference for this parameter.	Feature Layer
input_road_pir_segments (Optional)	Dialog Reference Specify your input road PIR segment features. There is no Python reference for this parameter.	Feature Layer
boundary_method	Dialog Reference Specify the HCA-MCA boundary extension method. Arc Method is the default and should not be altered under most circumstances. There is no Python reference for this parameter.	String
hca_range (Optional)	Dialog Reference Specify the destination of the output HCA range features. There is no Python reference for this parameter.	Feature Layer
hca_count_out (Optional)	Dialog Reference Specify the destination of the output HCA segment features. There is no Python reference for this parameter.	Feature Layer

Code Samples

HCA-MCA Calculation (Method 2)

# Import GasHCA Library

import hcapy

# import Gas HCA Tools

arcpy.ImportToolbox(“C:\Python27\ArcGIS10.6\Lib\site-packages\hcapy\esri\Toolboxes\Gas HCA Tools.pyt”)

project_database = r”C:\projects\GasHCA_Enhancements\A_DOTCLass_Test5.gdb”

boundary_method = “Arc Method”

# Execute tool

arcpy.HCAMethod2_hcapy(project_database, boundary_method = boundary_method)

Environments

Current Workspace, Scratch Workspace, Default Output Z Value, M Resolution, M Tolerance, Output M Domain, Output XY Domain, Output Z Domain, Output Coordinate System, Extent, Geographic Transformations, Output has M values, Output has Z values, XY Resolution, XY Tolerance, Z Resolution, Z Tolerance

Licensing information

This tool requires a valid Gas HCA Tool user license or subscription. Please see the Request License and Register License tool help topics for details on obtaining and registering a Gas HCA Tool software license.

Credits

Use limitations

There are no access and use limitations for this item.