Page History

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1. In the Catalog pane, add the US_tract_2010_harriscounty and US_tract_1980_harriscounty feature class to the Houston History Map view. 
2. In the Contents pane, right-click the US_tract_2010_harriscounty layer name and select Symbology.
3. Use the primary 'Symbology' drop-down menu to select Graduated Colors.
4. Use the 'Field' drop-down menu to scroll down sixth from the bottom and select the AV0AA2000 AV0AA2010 field. This field stores the total number of persons per census tract in the year 20002010.

The map view now displays a choropleth map, where the darker colors represent higher numbers counts of people. In studying the map, there does not appear to be a pattern. Now you will try normalizing by the area of the census tract.

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As mentioned previously, the projection of the census layer is WGS 1984. Therefore, the layer is unprojected and the coordinates are stored in angular units of decimal degrees. Therefore, the Shape_Area field is displaying square decimal degrees and the map is displaying number of people per square decimal degree. This is a somewhat incomprehesible unit, however, the values are still proportional to how they would be in a different unit and the relative coloring on the map remains correct. If you wanted to make a map that displays vacant housing units per square mile, then you would need to project the US_tract_2010_harriscounty layer. Projecting is further covered in the Introduction to Coordinate Systems and Projections course.

Notice that according to the density of population count, the greatest amount of people appear to be both inside and outside the loop along 59.

1. Use the 'Normalization' drop-down menu to select the SUM_HU100 field.

The map is now displaying the number of vacant housing units divided by the total number of housing units, or the percent vacant housing units. While all three methods of symbolizing the vacant housing units are techically corect This is probably the most common

1. On the lower half of the Symbology pane, click the Histogram tab.

1. On the lower half of the Symbology pane, click the Histogram tab.

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Discuss and test classification methods.

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Discuss and test classification methods.

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1. Use the 'Method" drop-down menu to select Equal Interval.
2. Use the 'Method" drop-down menu to select Quantile.

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Adding Layer Transparency

1. Ensure that the CensusUS_2010tract_By2019_SuperNeighborhoodharriscounty layer is selected.
2. In the ribbon, click the Feature Layer contextual Appearance tab.Appearance tab, in the Effects group, slide the Layer Transparency slider or type "50" and hit Enter  on the keyboard.
3. Remove layer transparency by typing "0" and hitting Enter on the keyboard. 

Swipe Layers  

1. In the Appearance tab, in In the Effects group, slide the  the Layer Transparency slider or  or type "50" and hit Enterand hit Enter  on the keyboard.

Symbolizing Layers By Category

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