Dynamic Choropleth Maps Get Java Virtual Machine  |  Tutorial  |  Help  


Dynamic Choropleth Maps was designed as a data visualization tool and is intended to be used for spatial analyses. A very extensive collection of county level data sets has been integrated into this product to give users access to a full spectrum of key data from Environmental to Demographic to Health. Visual associations or patterns observed from data combinations may not necessarily imply a relationship; further investigation is recommended.

System Requirements

You will need at least 1024x768 resolution to see the full map and slider controls. Go to control panel to set resolution if needed. In IE or Mozilla you should also press the F11 key for Full Screen, or select View from the browser menu bar then select Full Screen. The applet is compliant with Java virtual machine 1.1 or later. If your browser does not have the Java virtual machine you can obtain it by clicking the link for "Get Java Virtual Machine." If java is not working make sure Java is enabled in your browser. See Help->Quick Start Guide for more information.

Zooming the map

The map uses point and zoom. To Zoom in at point on the map press and hold down the left mouse button. Zooming stops when the mouse button is released. To Zoom out to the full map click the mouse button.

Drilling Down in the map

Right click the mouse over the map to bring up a popup menu of web tools into which you can drill down for more information specific to a county.

Data Download and metadata

Right click a data set in the data tree, then select download to load the file into a browser window, or metadata to bring up metadata information about the data.


Right click the map and select "Analyzer" to transform data and map it. Data variables associated with the South, East, and North Sliders, are identified as X,Y, and Z, respectively. A transformation of the form f(x,y,z) is assigned to x, y, or z. The function f is formed using the operators +,-,*,/,^,(,). For example z = 100 * (z-x)/x assigns z as the percent change of z with respect to x. A dialog box will allow the transform to be input as well as an optional title. Click OK to map the transformed data. See the tutorial for more information on this feature.

History feature

The history buttons can be used for map history, just like browser history. The buttons are above the data list box.

Map Legend

Use the check box in the upper left corner to activate the floating Legend. The Legend window can be dragged by grabbing it. The Legend details will change in real-time as the sliders are moved.

Using Dynamic Choropleth Maps

Click the Help or Tutorial links for detailed instructions on using the software.

For further Information