Click the title to begin:


by Dr. Waldo Tobler


Dr. Tobler describes the areal interpolation technique he deve-loped to permit the construction of density, or contour maps, from data arranged by area. Such data, which may include information about geographical units such as school districts or neighborhoods, are common in the social sciences, but
present special problems for cartographers. Dr. Tobler's tech-nique provides social scientists with a means of resolving these problems.

You will need the RealPlayer™ to watch this slideshow. If your browser warns you that you don't have a necessary plug-in or helper application, you need to download and install the free RealPlayer here. To adjust the sound, use RealPlayer™ volume control or the Sound Settings in your Control Panel, using this icon on your status bar. You may need to adjust both.