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It is early in the project to be deciding upon symbology, however, when layers are added to a Map, ArcGIS Pro assigns a random color to the layers. Sometimes the colors are very faint and difficult to see at all or the colors of multiple layers are very similar to each other and difficult to distinguish. To ensure that everyone can easily see the layers we are working with, we will adjust the basic symbology.

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1. On the Map tab, in the Selection group, click the Select button.
   
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2. In the map view, click on a any neighborhood to select it.
3. Drag a box to select multiple adjacent neighborhoods.
4. Hold down Shift and click to add additional non-adjacent neighborhoods.
5. Hold down Ctrl to and click to deselect neighborhoods.

When you are finished using a selection, it is important to clear the selected features, because the majority of tools in ArcGIS Pro only run on selected features. Therefore, if you run a tool anticipating that you will be processing all features in a particular layer and you inadvertently have some features selected from a previous process, only those selected features will be processed, which will lead to unexpected results.

1. On the the Map tab, in the Selection group, click the Clear button to clear the selected features.

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Selecting Features Manually from the Table View

1. In the Contents pane, right-click the Census_2010_By_Superneighborhood layer name and select Attribute Table.
2. Right-click the Census_2000_By_SuperNeighborhood layer and select Attribute Table.
3. In the table view, use the scroll bar to scroll to the far right of the table.
4. Double-click the 'Name' field header to sort the neighborhoods alphabetically.
5. To select a neighborhood from the table, click the gray square on  to the far left of each row.
6. Cover Ctrl and Shift selection techniques.
7. On the the Map tab, in the Selection group, click the Clear button to clear the selected features.

Symbolizing Layers By Attributes

Symbolizing Layers By Quantity

1. In the Contents pane, right-click the Census_2010_By_Superneighborhood layer name and select Symbology.
2. Use the 'Primary symbology' drop-down menu to select Graduated Colors.
3. Use the 'Field:' drop-down menu to scroll down sixth from the bottom and select the SUM_Vacant. field. This field stores the number of vacant housing units within each neighborhood.

Within the map view, the darker colors represent higher numbers. This is a typical convention in choropleth maps. In studying the map, it appears as if the most vacant housing is in southwest Houston outside the Loop. While this is true according to raw counts per neighborhood, there could be differences in the neighborhoods that are unaccounted for.Discuss raw counts and darkest areas of map

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

Discuss density and changes on map

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

Discuss percent and changes on map.

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

Discuss and test classification methods.Show Histogram tab

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

Discuss and test number of classes.

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

Discuss and test color schemes.

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