Saturday, April 6, 2013

Setting Intervals on Raster Symbology Data

Problem: You found some raster data and have a color ramp displayed, but you only have a range of the different data. You want to be able to visually see what the different numbers in the data are by the colors. This can be done by adding intervals. 

Solution: 

  1. In the Table of Contents, double click on the raster data to open the layer properties
  2. Navigate to the symbology tab and select a color that will best represent your data in the color ramp drop down menu. 
  3. Once you have selected your colors click labeling to bring up the advanced labeling dialog box (See above picture, top right arrow). 
  4. From here you can select the number of intervals. This will show how your data is divided up and labeled by color.
    1. There are two ways to divide up your data. The first radio button allows the user to select how many intervals and lets the computer decide how much data is in each interval. Click generate.
    2. The second radio button allows the user to select how much data is in each interval. An example is 250 meters per interval. Click generate.
  5.  You will be able to see how your data will be split up to determine which option is best. For this example, I have selected 7 intervals using the first radio button. Hit OK when you are finished.

    6. In the layer properties click apply and then OK
    7. Now you are able to see that the dark brown area is 2,496 meters above sea level. 

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