![]() Choose Pop_10 (2010 Population) and Normalize by your area field.Now open the symbology properties of your new layer and choose to map your blocks by Quantities > Graduated Colors.Right-click the heading of your new column and choose Calculate Geometry and fill in the blanks appropriately.Name this field "Hectares" or "Acres" depending on your preference. Which is a numeric type that can have decimal places. Open the attribute table for your blocks shape file and inspect the attributes.Normalization factors out the area of each block, allowing us to compare their population density on equal terms. After exploring the problems of comparing the population of blocks of different sizes, we will then add a Hectares or Acres column to our table and will use this to Normalize the data. In class, we will begin by making a map of population per census block. This shape file came from the Census Bureau's TIGER Download site. We will refer to this as our Blocks shape file. Use the ArcMap Add Data button to find the tabblock2010_25_pophu_extract.shp feature class and and add this to ArcMap. Use your file system browser to look at the files in the folder sources/census_tiger_2013. The idea behind this framework is to provide labels for the major political and physical elements that tie our area of interest together with its regional context. Graphical hierarchy has been created for our study of Somerville.įollowing the tutorial Nuts and Bolts of Mapping If you open the file gis_docs\greenline_ext.mxd you will see that a nice Primer on Organizing Data and Metadata with Arcgis. The dataset includes data and metadata from various sources. Understanding and Obtaining Census Dataĭownload and Explore The Tutorial DatasetĪnd unpack it to a new directory on your local hard drive.This topic is discussed in more detail on the page, Mapping with Quantitative Data which is required reading for this tutorial, which only covers the nuts and bolts of the subject. It is all to common to see maps made with GIS that reveal that tne map-maker, though he or she has learned how to make a map, has nevertheless misunderstood how to make sense out of the data. It is more complicated to make a map that is a useful tool for understanding the way that data describes a place and the things and conditions that were observed. It is easy to make colorful maps with quantitative data. Effective Cartography Mapping Census Data
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