Geographic Analysis Tools TransCAD Geographic Analysis Tools 2019/5/22

To Measure the Distance Between Points, the Size of an Area 2019/5/22

To Calculate the Distance Between Map Features 2019/5/22

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 2019/5/22

To Create an Overlay 2019/5/22

To Build Areas of Influence 2019/5/22

2019/5/22

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. 2019/5/22

To Create Districts 2019/5/22

To Create Bands 2019/5/22

To Create Area Layers from Line Features Then make a selection 2019/5/22

To Create Line Layers from Area Features 2019/5/22