About TRCTR-PLLR

I needed a way to randomly sample location data that mirrored population distribution in the United States. My particular need was to study visual changes in my maps as they collected 100, 1,000, 10,000, or 100,000 points and to alter their style accordingly. The underlying idea could also be used in factories for unit tests, or for creating simulation models based on United States locations.

Is it necessary to point out that this is a simple visual design tool? Census tracts are chosen randomly based on population data, points are generated simply with the requirement that they fit within the boundaries of the tract. TRCTR-PLLR has no awareness of cultural or physical features within a tract that would determine or explain where people genuinely live.

This hosted instance may disappear in the not-too-distant future so once instructions are available, you should set up your own copy. The source code is available at the project's GitHub repository and there's a blog post in the works that explains the motivation and setting up your own instance. And the name.

I hope you find it useful in the work you do.

Eric Theise

TRCTR-PLLR
Observations
Output format
Properties

The 2010 National Census Tracts Gazetteer File includes the properties geoid, usps (state or territory), and pop10 (tract population). They're helpful and, by default, they're included in your output.

You can add one custom property and specify weights for its distribution.

Output