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TransCAD

TransCAD. Geographic Analysis Tools. To Measure the Distance Between Points, the Size of an Area. To Calculate the Distance Between Map Features. Using Overlays.

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TransCAD

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  1. TransCAD Geographic Analysis Tools

  2. To Measure the Distance Between Points, the Size of an Area

  3. To Calculate the Distance Between Map Features

  4. Using Overlays • Overlay is a procedure that estimates the attributes of one or more features by superimposing them over other features, and figuring out the extent to which they overlap. You use overlays to estimate the attributes of features in a layer based on data in another map layer. For example, you can use overlays to: • Compute the total length of all streats inside one or more ZIP Codes • Overlay bands around a hazardous waste site on a block group layer joined to medical information, to compute the number of cancer patients within certain distance of the site • Overlay trade areas around potential retail store sites on census tracts, to estimate the population and average income in each market area • Count the number of hospital beds, trauma centers, and other medical resources around an earthquake fault

  5. To Create an Overlay

  6. To Build Areas of Influence

  7. Creating Districts • A district is an area that is made up of several smaller areas, all joined together. For example, a sales territory might be made up of a group of ZIP Code areas. TransCAD can build districts for you and compute the attributes of each one. • There are three key steps in creating districts: • Choose an area layer to use as the basis for your districts. You can choose whether to use all the features from the layer of just those in a selection set. • Assign a district number or name to each area. • Use the Merge by Value command to create a new geographic file containing the districts.

  8. To Create Districts

  9. To Create Bands

  10. To Create Area Layers from Line Features Then make a selection

  11. To Create Line Layers from Area Features

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