Spectral Glimpse delivers on-demand satellite-derived spectral index values for any point in California. Click anywhere on the map to sample six vegetation, moisture, fire, and snow indices computed from NASA VIIRS 8-day composite imagery.

Each index comes with a current value, a plain-language interpretation, and two years of historical trend data so you can see how conditions have changed over time.

Data is sourced from NASA's VIIRS VNP09H1 product at 500m resolution. Built and maintained by Jerrod Lessel, a geospatial analyst at Caltrans on California's Central Coast.