Using colors to compare data

Comparison of "Quantitative Information" for the same level administrative units can be visualized using two color schemes:
  • Qualitative scheme - use distinctive colors to distinguish different categories in your data values
  • Sequential scheme - to accurately display the data and relationships between administrative units

Administrative units are for example the countries of the world or the states of a country.
We refer to these as "Divisions" or "Shapes".

Load visualization data

Create a new map work based on a "Divisions" base map.
    After you prepare your data
  1. Click "Load Data" button or the Data Set name link below it.
  2. Edit the name of the data set.
  3. Copy and Paste your data into this text box.
  4. Indicate what character separator you are using between the ID of the "Division" and the data value.
    TAB is used when data is being copied from Excel.
    In this example we are using "comma" as data was copied from a CSV Text file.
  5. It is important to use the "Division" IDs indicated in this file.
    These IDs are matched with the "Divisions" of the base map for rendering the correct values on the map work.
  6. Validate your data and display it.

Qualitative scheme

You could use qualitative color scheme for nominal, un-ordered, non-numerical data. ColorBrewer 2.0 is a good color selection tool that allows to experiment with the most popular color swatches in various combinations.
    After you loaded your data
  1. Choose "Coloring" representation.
  2. Choose "Qualitative" color scheme.
  3. Add more categories, as needed to match /describe/ your data.
  4. Click this square buttons to display the Style dialog, to pick or enter a color.
  5. Set the data values range. On the left, enter the smallest value you have in your data set for this category, and the largest in the right input box - for the same category.
  6. If you are displaying a "Legend", the values you enter and the colors you choose will be updated here.
    You can move the legend by dragging it - press mouse button on the gray " Legend " marker, or you can resize it.
    Click the "T+" icon to add more text lines to it, or the circle marker to reposition the color categories.
    You can further apply your personal style on the legend presentation by opening the "Legend" group in the Features Toolbox.

Sequential scheme

If you have orderable /ordered by value/ categories (such as low/med/high) or if you have numerical data, a sequential color scheme is what you need.
    After you loaded your data
  1. Choose "Coloring" representation.
  2. Choose "Sequential" color scheme.
  3. Pick a predefined or "Define" your own divergent sequential scheme.
  4. Click this square buttons to display the Style dialog, to pick or enter a color.
  5. Set the data values range. Enter the smallest value you have in your data set in the left, and the largest in the right input box.
  6. If you are displaying a "Legend", the values you enter and the colors you choose will be updated here.
    You can move the legend by dragging it - press mouse button on the gray " Legend " marker, or you can resize it.
    Click the "T+" icon to add more text lines to it, or the circle marker to reposition the color gradient.
The demo for Qualitative scheme...
The demo for Sequential scheme...
References: http://earthobservatory.nasa.gov/resources/blogs/intro_to_color_for_visualization.pdf