North American Croplands Teki Sankey and Richard Massey Update: 8/21/2014

United States Cropland Distribution: 2008 (source: USDA CDL) Landcover typePixels (56 meter)% of total croplands % Sum Winter Wheat Spring Wheat Durum Wheat Corn Sweet Corn Pop or Orn Corn Rice Barley Soybeans Lentils Cotton Potatoes Sweet Potatoes Alfalfa Dbl Crop WinWht/Soybeans Sorghum Sunflower

NDVI spectral signatures for 2007 Pure pixel spectra by 5x5 buffer window Pixel size = 56m, resampling to 250m will not mix boundaries after buffer Random points inside boundaries, max 10,000 per crop per Agricultural Ecological zone Extraction of NDVI spectra for each of the point (spectral database) Correlation of CDL NDVI spectra with obtained class spectra from Isodata classification of each Ag-eco zone Labelling of classes

5x5 buffer window (pixel size 56m)

FAO Ag Eco zones

Random Sample points per crop type per Ag-Eco zone for 2007 CropAEZ3AEZ4AEZ5AEZ6AEZ7AEZ8AEZ9AEZ10AEZ11AEZ12Total Winter Wheat Spring Wheat Durum Wheat Corn Sweet Corn Pop Corn Rice Barley Soybean Lentils Cotton Potato Sweet Potato Alfalfa WinWht/Soybean Sorghum Sunflower Total

NDVI spectra for Ag-Eco zone 6

AOI-3 Ag-Eco zone 6 WWSWDWCORIBASBLTCTPTSPAAWWSBSGSF CLASS CLASS CLASS CLASS CLASS CLASS CLASS CLASS CLASS CLASS CLASS CLASS CLASS CLASS CLASS

Further analysis 1.Spectral correlation similarity using R 2 values (> 0.95) 2.Euclidian distance similarity using a buffer for CDL NDVI and class spectra 3.Class grouping and re-running the R 2 comparison 4.Testing for Significant differences in R 2 5.Grouping small crop cover types in adjacent Ag-Eco zones

Thank you