From the Swatches window you can change the colors of any of the fill values.Īnother method to choose a color palette is to use the Color Ramp pull down menu and choose a different palette of colors, such as minerals or pastels. While still in the Properties window, click on symbol next to the value you are symbolizing, this will bring up a color picker window. (Disclaimer: this can be a bit hard to accomplish, so if you are finding this difficult, just skip this step and look at the pictures, below.)Ĭlick OK and close the Layer Properties window. Repeat this procedure for all of the five breaks listed below. In the next break type 40000 to reflect the next break change the next level to 100000.
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To set Manual breaks - In the Classification window choose Manual, in the Breaks Values window, select the first break, 10000. Before setting up a third type of classification, Natural Breaks. Take another look at the Attribute table for the data and observe the patterns in the data. How many cites have a population less than 10,000? How many cities have a population between 40,000 and 10,000? How many cities have a population between 100,000 and 40,000? How many cities have a population between 220,000 and 100,000? The result is two cities: Baton Rouge and New Orleans. Color Start color Light Gray, End color Red.In the Properties window, select the following options: Try separating the population data into quantiles. There are other ways to break data sets into groups. top of page Classify Point features by Quantile Return to the Properties window and adjust your settings. Notice that all the cities are almost all of one size. However, the data on the map is hard to interpret. It is split into 5 groups with the cities that have the largest population colored with red dots. The data is differentiated both by size and color.
The map now displays the location and population of each city in Louisiana. Study the map - How do you think equal interval classification breaks up the data? In fact, 386 of the 391 cities are represented by small yellow dots. The resulting map consists of mostly yellow dots. Right click on the layer name cities to open the Layer Properties window. Note: The cities layer is automatically turned on when it is added. Cities should now be the top layer on your map.
Launch ArcGIS, Open the Louisiana Project File, and Add a New Layer This type of representation of data is known as classification. However, in order to communicate more in-depth information about the map's features we are going to modify the map symbols to not only show location, but also to display additional information about the data they represent, such as numbers of homes or population. So far the information displayed on the Louisiana GIS map gives you a good overview of where the Cities and Parishes in Louisiana are located. Top of page Getting to Know Classification in ArcGIS
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