*These downloads represent output of our program for a land area near -105.98 degrees west by 40.1 degrees north.
The source code can be found here.

 About the program:                                                                     
These models demonstrate shading projections as calculated by our        program. The program can be used to model many land plots for any given day of the year. Shade will be calculated at preset intervals, currently the program is using a 15 minute interval.

In an effort to model the Colorado River Basin, this program will allow for more accurate solar radiation calculation. Work is ongoing to optimize and create an open source version. This site will be updated with program announcements.
If you have any questions, comments, or would like to request additional information contact : Troy Axthelm at

This site and program was created by and is maintained by Troy Axthelm and Jingyu Li.
 Planned Additions:                                                                     

To provide as accurate of a model as possible, many features will be added to the current program. Vegetation can have a great impact on the amount of sun that reaches a piece of land throughout the day. To model this, we will add an optional vegetation layer that will calculate the shading with vegetation data for the given area.

The time complexity of this program is also a point of concern due to the massive number of some computations needed to produce such a sophisticated shade model.  As we progress, we will be aware of time issues and will address them in a way that allows the model to maintain its accuracy as well as compute in a timely manner. 

Shade Mapping: Gradient Visualization

In this video, cool colors indicate shade and warm colors indicate sunlight. The video begins at midnight (0:00) and runs in 15 minute increments through the day. Sunlight appears on this plot at 3:30, around 7 seconds into the video.