The geodatabase is named ACS_2013_5YR_BG_25.gdb. The 2009-2014 ACS 5 year summary geodatabase for Massachusetts may be found in the Sources\census_tiger folder. This feature class can be found in the sources/census_tiger folder. Our sample data set includes a geodatabase from the ACS Five Year Estimates, downloaded from the Census Bureau's TIGER Download site. This sampling method leads to large margins of error depending on which statistic you are looking at. Īs we explain in more detail on the page About Census Data the American Community Survey (ACS) uses a very complicated sampling method to collect lots of very specific information on households.Viewing the Selected Features in the Attribute Table.Selecting Features Interactively ArcGis 10.6 Web Help.Making simple field Calculations Note: it is not necessary to start an edit session when you do this. Then, you can use the Select tool to select the blocks within the map, and sort by Density. The best way to explore the dentisites within the map is to create a new field in your attribute table for for Population Density and calculate the values. This is easy, but inpractice it is not the best, since you may want to change the map extent later. One way of doing this would be to create a new shape file by exporting the blocks within the current map extent before creating your classification. Keep in mind that our census blocks layer covers much more than our study area. The final stage of figuring out your class-breaks would be to figure out what the very top value should be. What is the Block with Highest Density Within the Map Extent Adjust your legend headings and titles so that they are easy for a human being to understand. Use the Classification options in the symbology properties to create new class breaks that help your users to see the blocks with extremely low and extremely high population density and a few grades to show blocks of average, above average and below average density. The automatically generated classification created by ArcMap may be a good starting place for categorizing your data, but the crazy numbers that result for the class divisions do not make for easy reading. 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.
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