Geographic data for Louisiana, along with scripted processing and cleaning.
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README.md

Louisiana and New Orleans geographic data

A collection of geographic data for New Orleans and Louisiana, with a fully scripted data-cleaning process.

Table of contents

What's included

All files that are ready for use are stored in the exports directory. Each geography includes a full-sized version with all original metadata, as well as a simplified version (using the suffix -simplified) with less accurate boundaries that is smaller in size than the original and only includes the relevant metadata. The simplified versions are more suitable for web applications because of their smaller file sizes.

All files are available in the ESRI Shapefile (.shp), GeoJSON (.json) and TopoJSON (.json) file formats.

Click the links below to see previews of each geography.

Municipal districts

Parishes

Precincts*

Property

State districts

Water

*Note: Precincts can change many times per year, so the accuracy of these files are usually only good for a few months. Always double-check with the appropriate parish offices before using the data to make sure that the parish's voting precincts have not changed recently. The statewide file comes from the House of Representatives is almost always out of date, so only use this file for historical data. This would not be suitable for an election night live data feed because the parcel shapes won't match.

Future releases

See the Issues tagged "data-suggestion" for plans for the future. Comment on those issues if you'd rather see some sooner than others.

Contributing to this project

See CONTRIBUTING for the full details about how you can contribute to this project. Here are the basics:

Report bugs, ask questions and suggest features on the Issues page. If you aren't sure whether you should submit a pull request or not, just do it. I'm not picky and would much rather receive some sort of help and have to make adjustments than receive no help at all.

Setup for development

Most cleaning is done using the command-line tools ogr2ogr and topojson, as well as some use of Mapshaper, PostGIS and Python. A single Makefile scripts each step, which makes use of Unix utilities.

Installation

If possible, use a package manager such as Homebrew for Mac or apt-get for Linux to make your life easier.

ogr2ogr

Linux:

apt-get install gdal-bin

# If you get a permissions error, try running as super user:
sudo apt-get install gdal-bin

Mac:

brew install gdal

node.js

Linux:

apt-get install nodejs

Mac:

brew install node

topojson

Relies on node.js.

Linux and Mac:

npm install -g topojson

Contact

This repo is maintained by Thomas Thoren. Please contact tthoren@thelensnola.org with any questions.

License

MIT. See LICENSE for full information.