Massachusetts Institute of Technology Department of Urban Studies and Planning 11 520 A Workshop on Geographic Information Systems 11 188 Urban Planning and Social Science Laboratory Lab Exercise 6 Vector Spatial Analysis Due in Lab 7 In this exercise you will perform several different types of spatial analysis using the TIGER files cambtigr census block group data cambbgrp shp land use data landuse85 shp and various retail store locations for Cambridge Preliminaries 1 Launch ArcMap and add the following layers in the directory M data M data landuse85 shp M data cambbgrp shp not a coverage M data cambtigr coverage M data cambridge ice cream shp M data cambridge bookstores shp M data cambridge record stores shp Cambridge land use in 1999 per MassGIS U S Census 1990 block groups for Cambridge U S Census 1990 TIGER file for Cambridge Ice cream stores in Cambridge Bookstores in Cambridge Record CD Tape stores in Cambridge The source for the cambridge ice cream shp cambridge bookstores shp and cambridge record stores shp layers is the http www bigyellow com web site on November 1 1999 The locations were downloaded from the web page then geocoded in ArcMap We ll be exploring address geocoding in a subsequent lab Recall the usual preliminaries Since the datasets we ll be using are in Mass State Plane coordinates select View Data Frame Properties in the menu bar and set the map units to meters and the display units to miles If you want you can also change the name to something more informative than Layers 2 Go to the M data chapter11 folder You can find ArcGIS map document files ex11a mxd and ex11c mxd and directories Data and MyData Please copy all files and directories under the chapter11 folder and save them in your personal working space Part 1 Point in Polygon Spatial Join and Cluster Analyses In this part of the lab you will examine the demographic characteristics of the block groups in which various types of bookstores are located The bookstore data are contained in the shape file called cambridge bookstores shp ArcMap can do polygons to point overlay operation using a spatial join This time we ll explicitly set up a spatial join between cambridge bookstores shp and cambbgrp shp so that block group attributes can be added to bookstore table Spatial join Click the cambridge bookstores layer from the data frame window Click the right mouse button to select joins and relates join Join Data window will come up Select Join data from another layer based on spatial location for What do you want to join to this layer option Choose cambbgrp shp for a layer to join to this layer Check the it falls inside option Specify the name bookstore bgrp shp of the new file and the location your working directory where it is stored Click OK The new shape file you just created bookstore bgrp shp will be added in your data frame If you examine the attribute table for bookstore bgrp shp you should now see the attributes of cambridge bookstores and cambbgrp shp The Shape columns aren t true attributes they serve as placeholders that represent the geometry of layers that allow us to perform the spatial joins this way Now we can make a thematic map of cambridge bookstores shp using the attributes of cambbgrp shp Open the layer property window of bookstore bgrp shp to make a Graduated symbol map using the Med hh inc field You should end up with the bookstore locations sized by the median household income of the block group containing them To provide additional context for interpreting these locations create a thematic map of land use using the landuse85 shp layer This time you can name the file as bookstore lu99 Follow the same instructions as in the Explanatory Mapping portion of Lab 2 except this time ignore the directions regarding the layer sales89 Make the Cambridge TIGER file visible as well For the definition of the land use code please check the Massgis Massachusetts Geographic Information Systems land use definition at http www state ma us mgis lus htm Take a close look at the pattern of bookstores Does anything look interesting Write your observations as requested in the Question 1 of the assignment Make a layout of your map and submit this as the answer for Question 2 For extra credit or just for fun redo the spatial join this time tying the block groups to the ice cream stores and the record stores this requires a spatial join for each of the store layers and display them on the map too Do the additional store locations help you to see a pattern Part 2 Buffer Analysis In this part of the lab you will analyze the demographics of the neighborhood around MIT s biological research facility on Ames Street You will build on what you learned in the Simple Buffering part of Lab 3 to do a more elaborate analysis Here you will use ArcMap to calculate the number of children 5 years of age and under who live within half a mile of the facility To begin you will draw a half mile buffer around Ames Street First you will select Ames Street from the cambtigr coverage and then draw a buffer only around that street Select the cambtigr layer then use the Selection Select by Attributes menu item to select the arcs where the Fname field is Ames and the Ftype field is St You may have trouble spotting the arcs you just selected use the View Zoom Data Zoom To Selected Features menu item to help you find them You should end up with three selected arcs Now let s draw a 1 2 mile buffer around Ames Street Use the Analysis Tools Proximity buffer please see following figure in toolbox to start the buffer tool In the first step make sure to buffer only the selected features of cambtigr In the second step specify a distance of 0 5 miles Note that you must type the leading zero In the third step tell it to dissolve the barriers between the buffers by selecting ALL and to save the results in a new layer called amesbuf in your working directory A new data layer called amesbuf will appear in your data Frame Now move down the amesbuf layer so that cambtigr and the point layers display above the buffer You should be able to clearly see the selected arcs in cambtigr at the center of the buffer Number of Children within a Half Mile of Ames Street Since you are interested in finding the number of children that live in the buffered area your database must include the relevant age variables Take a look at the attribute table of cambbgrp shp in ArcMap and note that there are several age related variables that contain numeric counts Age