Browsing Articles Written by

Luke

Partisan advantage in Pima County’s voting precincts

GIS By April 11, 2017 Tags: , No Comments

Below is an interactive choropleth map showing the respective distribution of registered Democrats and Republicans among Pima County’s 249 voting precincts.1 If you hover your cursor over any location on the map should display voter registration totals for that location’s precinct. Voter registration data for this map was obtained today from the “voter statistics” section of the Pima County Recorder’s website.


1. It might be argued that Pima County has not 249, but 248 voting precincts. As a cartographic matter, it certainly has 249. Precinct 27, however, encompasses an area within the Pusch Ridge Wilderness that presently contains no street addresses, and thus, no registered voters. As such, it does not appear in the Pima County Recorder’s voter statistics. Nevertheless, it is a numbered precinct with a defined geography.

Homeowners receiving Arizona’s Historic Property Tax Reclassification in Pima County

GIS By February 20, 2017 Tags: , , , , 4 Comments

For its recipients, Arizona’s Historic Property Tax Reclassification is a pretty great deal. Homeowners who qualify get their assessment ratios slashed from 10% to 5%, cutting their property tax bills in half. This map shows the residential properties in Pima County that receive this benefit. If you zoom in and click on an individual parcel, the map should display that property’s street address and parcel number. For a re-sizable window in a separate tab, click here.

For more on what it takes to qualify for the Historic Property Tax Reclassification, and how to apply, click here.

Homeowners versus renters in Pima County

GIS By February 19, 2017 Tags: , , , 2 Comments

This map attempts to visualize Pima County’s respective distributions of residential property that is owner-occupied, and residential property that is not. The latter category consists almost entirely of rental property, but also includes a few other instances of non-owner-occupied property, such as vacation homes, certain group homes, and bed-and-breakfasts. It is represented in orange; the owner occupied property is represented in blue. To view this map in a separate, re-sizable window, click here.

Only residential property is represented on this map. Included in the white areas are public rights-of-way, government property, commercial property, agricultural property, and a number of other non-residential property types. This map distinguishes owner-occupied properties from other types based on their legal class, according to the Pima County Assessor’s records. For more information about legal classes, click here.

A closer look at the 2016 presidential election in Pima County

GIS By February 5, 2017 Tags: , , , , 3 Comments

This map shows each of Pima County’s 248 voting precincts with a shades of blue and red to indicate the respective degrees to which they favored the Democratic or Republican candidate, Hillary Clinton or Donald Trump. You can zoom in for a closer look, and click on any precinct for more detailed information. For a resizable version in a separate window, click here.

Although they were on the ballot, I chose to ignore vote totals for the Libertarian and Green party candidates for the purpose of this map. I also ignored write-in votes, over-voted, and under-voted ballots. None occurred in percentages that exceeded single digits, with the exception of Gary Johnson, who received 42 out of 412 votes—10.19% of the total—in precinct 114.

A GIS tour of Arizona’s golf courses

GIS By February 3, 2017 Tags: , , No Comments

This map shows Arizona’s 353 golf courses. (For a resizable version in a separate window, click here.) If you click on one of them, the map should display the course’s name, number of holes, whether it is public or private, and in some cases, what type of water source it uses. (The source file only contained this data for a limited number of courses.)

The GIS data shown here is provided by the Central Arizona Project, and was obtained via the AZGEO Clearinghouse, an great resource for GIS professionals and enthusiasts.