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Planimetrics

The North Central Texas Council of Governments has facilitated the cooperative purchase of digital planimetrics for the following entities in the Dallas/Fort Worth Metroplex (36 cities plus all of Tarrant County).

Alvord DeSoto Haslet North Richland Hills Stephenville
Arlington Farmers Branch Heath Parker Tarrant County
Bridgeport Flower Mound Kaufman Plano Terrell
Cedar Hill Forney Lewisville Rhome Waxahachie
Coppell Fort Worth Little Elm Richardson White Settlement
Crowley Frisco McKinney Roanoke  
Dallas Grand Prairie Mesquite Rockwall  
Denton Haltom City Midlothian Sanger  

Feature layers include building footprints, sidewalks and pavement (road edges, parking lots, bridges, medians and islands).  The data are available for online purchase.

Data are available on a per-tile basis that includes all available features from the list above for $25.  Tiles are based on the same index grid as aerial photography and contours and measure 3,000’ x 2,000’ or 0.215 square miles.  Sample data and a shapefile of the tile structure may be downloaded below.  All planimetric orders can be placed via www.dfwmaps.com.  Before placing an order, please read the instructions and frequently asked questions.

The following downloadable zip file contains sample planimetrics of buildings, pavement, and sidewalks in shapefile format.

 City of Arlington Sample Files

 

Specifications

Using a method also known as heads-up digitizing, planimetric features were captured from the 2007 digital orthoimagery. In heads-up digitizing, lines are traced by hand directly on the computer screen using the digital orthoimage as a backdrop. Planimetric features are acquired quickly, requiring fewer tools and less processing than traditional photogrammetric capture. This method of capture also allows for many digitized features to closely match the horizontal accuracy of the orthophotography.

The following specifications have been provided by the contractor for this project, Sanborn.

* Capture rate is a percentage based on a 1=750 negative scale and a 6,720 square mile area (1=100 map scale)
Feature 6-inch Ortho Capture Rate*

Buildings (>100 sq. ft.)

100%

Paved parking (5 cars or more)

100%

Paved roads (edge of pavement)

100%

Unpaved roads (public, maintained)

98%

Public sidewalks

100%

Bridge

100%

 

If you have any additional questions, please contact Shelley Broyles at 817-695-9156 or via email.  


 

 
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