The Center for Watershed Sciences has a set of study sites on rivers throughout the northern Sierra Nevada range in California. Part of this research includes monitoring the river's edge habitat with remote game cameras. After a year's worth of captures, we realized we could do some other processing with these videos. This video shows images and hydrographs from two nearby rivers capturing the same moment in time.

About the images:
The images in this video are taken by a pair of identical game camera's that take an hourly picture, on the hour, 24 hours a day. The left images are from the Clavey River, and the right images are from the confluence of the Clavey (left) and Tuolumne (right).

How the video is made:
For this video, we pulled in river stage data from USGS flow gages at nearby, but not exact, locations. Using Python and matplotlib, we created a hydrograph for each time. Then, using Perl and ImageMagick, we overlaid the hydrographs with images based on the timestamps and then paired images together based upon closest timestamps (which also leads to the stuttering you see on the right side). Finally, we used Virtualdub to turn the completed frames into a 10 FPS movie.

See for another video like this from the American and Yuba rivers and more complete methods.

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