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Bonus: Symbolizing Layers By Attributes

1. On the ribbon, click the Insert tab.
2. In the Project group, click the New Map button.
   
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3. Right-click the US_tract_1980_Harris_County feature class and select Add To Current Map.
4. Above the ribbon, on the Quick Access toolbar, click the Save button.

Symbolizing Layers By Quantity

1. In the Contents pane, right-click the CensusUS_tract_20101980_ByHarris_SuperNeighborhoodCounty layer name and select Symbology.

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1. In the

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1. Symbology pane, click the primary drop-down menu

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1. and select

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1. Graduated Colors.
   
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2. Use the 'Field' drop-down menu to

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1. select the 

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1. AV0AA1980 field. NHGIS data downloads include a read-me file that defines the codes for each field (column). AV0AA1980 stores the number of

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1. people within each

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1. census tract.
   
   The map view now displays a choropleth map, where the darker colors represent higher numbers of

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1. people. In studying the map, it appears as if

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1. there is no discernible pattern to population numbers. While this is true according to raw counts per

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1. census tract, there could be differences in the

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1. census tracts that are unaccounted for in this symbology. Now you will try normalizing by the area of the

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1. census tracts.
   
   
2. Use the 'Normalization' drop-down menu to scroll to the bottom and select the last Shape_Area field.

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1.  
   
   Note: the projection of the census layer is GCS WGS 1984. Therefore, the layer is unprojected and the coordinates are stored in angular units of decimal degrees. Therefore, the Shape_

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1. Area field is displaying square decimal degrees and the map is displaying number of

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1. people per square decimal degree. This is a somewhat

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1. incomprehensible 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.

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projecting is further covered in the Introduction to Coordinate Systems and Projections course.

1.  Notice that according to the density of

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1. population count, the greatest amount of

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1. people appear to be

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1. inside

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

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

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Discuss and test number of classes.

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1.  Quantile.
2. Use the 'Classes' drop-down menu to select 20.
3. Use the 'Classes' drop-down menu to select 4.

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Discuss and test color schemes.

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Adding Layer Transparency

1. Use the 'Color Scheme' drop-down menu to select a different color scheme of your choice.

Adding Layer Transparency

1. In the Contents pane, ensure that the US_tract_1980_Harris_CountyEnsure that the Census_2010_By_SuperNeighborhood layer is selected.
2. In the ribbon, click the

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1. Appearance

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1. tab.
2. In the Effects group, slide the Layer Transparency slider or type "50" and hit Enter.

Symbolizing Layers By Category

1. Use the primary 'Symbology' drop-down menu to selectUnique Values.

Use the 'Field 1' drop-down menu to selectName.

1. In the Contents pane, collapse the Census_2010_By_Superneighborhood symbologyReturn the Layer Transparency slider to "0".