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What differences can be expected when comparing CropScape pixel counts and official NASS statistics for counties, ASD, and states?

April 26, 2017comparing counties counts cropscape differences official pixel statistics

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What differences can be expected when comparing CropScape pixel counts and official NASS statistics for counties, ASD, and states?

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There will be differences between CropScape and official NASS estimates when comparing acreage statistics at the state, district, and county levels. Statistics generated by CropScape are dependent upon pixel counting. Pixel counting is usually downward biased when compared to the official estimates. Counting pixels and multiplying by the area of each pixel will result in biased area estimates and should be considered raw numbers needing bias correction. Official crop acreage estimates at the state and county level are available at http://www.nass.usda.gov/. Here are a list of references discussing the subject matter of pixel counting and estimation: a) Gallego F.J., 2004, Remote sensing and land cover area estimation. International Journal of Remote Sensing. Vol. 25, n. 15, pp. 3019-3047. b) European Commission, Joint Research Centre, MARS; Best practices for crop area estimation with Remote Sensing – Section 4.1.1. c) Czaplewski, R. L. (1992). Misclassification bias in areal estimates