GIS Workshop

GIS Workshop

  1. Introduction

Purpose: To develop a set of historical census tract boundaries for Dallas city limits, for 1940, 1950, 1950, 1970 using ARCVIEW. .

Existing data to be used:

Click to View:

1940 1950 1960 1970

  1. Basic Idea
  2. Use the TIGER polygon coverage as a template to create an accurate coverage for each historical census tract. Verify boundaries using the street centerline file (for accurate placement of boundaries) and the Mapsco (to verify street identity).

    Click HERE to view detailed instructions for converting photocopied maps to polyline shapefiles.

  3. Subsequent Tracts
  4. Once the first census tract coverage has been created, the other tracts are much easier to edit. The previous decade's coverage is duplicated, and then edited to match the image. Polygon identifications were added to all shapefiles once the editing was complete. Click HERE for completed maps.

  5. Final Step: Scanning information tables and converting to attribute data

Census tract information was available only as copies from a book, so the same method of scanning will be used on the tables. The information will then be converted to (by OCR) to a spreadsheet format, saved as a d-base file, and then converted to an attribute table.

NOTE: The above was the optimistic approach. Unfortunately, the scanner did not recognize the antiquated fonts and transferred only gibberish to the spreadsheet format (I tried Word, as well). I hand-entered a token amount of information from each data set.


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