Tag Archives: Color infrared

Oh how the years go by: 40 years – Mount St. Helens

This week marks 40 years since the Mount St. Helens eruption. The image above is from the USGS Earthshots trading card series. The images are displayed in color infrared which is useful for showing living vegetation in red. The mountains surrounding Mount St. Helens are primarily forest. Notice the extreme change in the landscape from the 1973 image to the post eruption image in 1983. The damage was extensive and ash covered much of the surrounding forest land.

Additional Resource

Earthshots: Satellite Images of Environmental Change – Mount St. Helens: https://earthshots.usgs.gov/earthshots/Mount-St-Helens#ad-image-0-0
Scroll through the images to watch the forest begin to return as the years go by!

2016 Imagery available for Eastern Iowa!

Spring 2016 ortho imagery is now on the Orthoserver – http://ortho.gis.iastate.edu/.  ISU GIS Facility staff created natural color, color-infrared, and 4 band image services for the spring 2016 aerial flight of the eastern half of Iowa.  The source resolution is 1 foot.  The services can be found at: http://ortho.gis.iastate.edu/arcgis/rest/services/ortho .