Crop history records are kept up-to-date using the NASS CDL.

Crop history is sourced from the National Agricultural Statistics Service's Cropland Data Layer (CDL), which was created by the USDA. The CDL is a raster, geo-referenced, crop-specific land cover data layer created annually for the continental United States using moderate resolution satellite imagery and extensive agricultural ground truth.

The crop history information on FarmlandFinder is updated annually across the U.S. using the CDL.

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