A set of tools for performing overlay analysis on a collection of point, line, and polygon feature classes using the classified MC-FRM flood probability data. There are two sets of tools:
- Tools for performing overlay analysis on the classified 2050 MC-FRM flood probabiltiy data
- Tools for performing overlay analysis on the classified 'current conditions' MC-FRM flood probability data
Set #1 was used for the Needs Assessment for the 2050 Long Range Transportation Plan; overlay analysis is performed on a variety of data.
Set #2 will be used for presenting current conditions; overlay analysis is performed on only one dataset.
The analysis is performed on point feature classes using a simple test for geometric intersection.
The analysis is performed on the line and polygon features using the ESRI "Identity" tool, which reports how much of each feature intersects the "identity" feature, in this case the 2050 flood risk polygons. The "Summary Statistics" tool is then run to calculate the sum how much of each "class" of input feature (e.g., roads with a functional classification of N) intersect with the polygon representing each level of flood risk. Lastly, these sums are converted from meters (or square meters) to miles (or square miles.)
The analysis is performed on the following feature classes:
- Point
- Bridge points (MassDOT)
- Culverts (MassDOT)
- MBTA rapid transit stations
- MBTA commuter rail stations
- MassDOT-owned park-and-ride lots
- CTPS-surveyed part-and-ride lots (centroid points derived from polygon features)
- Freight rail yards (MassDOT)
- Seaports (MassDOT)
- Intermodal Freight Facilities Rail TOFC COFC
- Hospitals (acute care)
- Hospitals non-acute care
- Community health centers
- Long-term care facilities
- Medical clinics
- Town halls
- Police stations
- Fire stations
- EV charging stations
- BlueBikes stations
- Line
- MBTA rapid transit lines - clipped to TOWNSSURVEY_POLY, selecting records with coastal_poly = 'NO'
- Commuter rail lines - clipped to TOWNSSURVEY_POLY, selecting records with coastal_poly = 'NO'
- Road Inventory 2021
- MassDOT Rail Inventory
- National highway system freight network - Critical Urban Corridors
- National highway system freight network - Critical Rural Corridors
- National highway system freight network - Primary Highway Freight System
- National highway system freight network - Non-Primary Highway Freight System
- Polygon
- 2020 Census tracts with EJ attributes, clipped to extent of 2050 MC-FRM probability polygons in order to greatly improve run-time speed
- minority
- low income
- limied English proficiency
- disability
- elderly
- youth
- 2020 Census tracts with EJ attributes, clipped to extent of 2050 MC-FRM probability polygons in order to greatly improve run-time speed
Each tool produces an ESRI FileGeodatabase feature class containing the geometric and tabular results of the overlay analysis for each input feature class.
Each tool produces a CSV file containing the tabular results of the overlay analysis for each input feature class.
The analysis is performed only on one line feature class using the ESRI "Identity" tool, which reports how much of each feature intersects the "identity" feature, in this case the current flood risk polygons. The "Summary Statistics" tool is then run to calculate how much of each "class" of input feature (e.g., roads with a functional classification of X) intersect with the polygon representing each level of flood risk.
- Line
- Road Inventory 2021
Same as for the 2050 analysis tools.
The usage is the same for the two sets of tools.
These tools require the ESRI arcpy library, and are intended to be run under the ESRI ArcGIS environment.
Each of these tools take 2 parameters:
- file geodatabase, for output feature classes
- directory (folder), for output CSV files
Author: Ben Krepp
Date: 23 June 2022
Updated: 27 November 2022, 12 April 2023
Location: Cyberspace