V. a. Modifying the Color Scheme
             Estimated time:
             3 minutes
By modifying the graduated color scheme of the Clipped Census Tract Layer (TexasTractLCP_Clip) a person can visually see which census tracts are out of compliance at the time of day they are examining. An example of when changing the color scheme can help seeing patterns, by adjusting the values, tracts can be identified easily. EPA has set the 8 hour ozone exposure at 75 ppb, and for a single hour at 120 ppb. When you are setting the break values in part a, you will be creating a cutoff to code the census tracts by ozone levels.
In this exercise, you will:
  • Modify the graduated color scheme, narrowing down to 2 colors, in compliance and out of compliance


                                                   Start VideoDemo

Text Version:

    1. Right Click on the Cencus_Clipped layer in the layer Table of Contents

    2. Click on Properties

    3. Click on Symbology -> Quantities -> Graduated Colors

    4. In the Value drop down box select 8HrOzContr

    5. In the Classes drop down box select 2

    6. Click Classify

    7. In the Method drop down box select Manual

    8. In the Break Values box type 75 as the first value and 200 as the second value, if you can’t set these values set the first value as high as you can

    9. Click OK -> OK