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Corn and Soybean Mapping in the United States Using MODIS Time-Series Data Sets

^a Geographic Information Science Center of Excellence, South Dakota State Univ., Brookings, SD 57007
^b Dep. of Geography, Univ. of Maryland, College Park, MD 20742

View larger version (16K): [in this window] [in a new window]   Fig. 1. Flowchart for processing MODIS crop type maps.

View larger version (15K): [in this window] [in a new window]   Fig. 2. Seasonal changes of NDVI for corn fields, where (a) is high (>50%) corn field density and (b) is low (<25%) corn field density pixels using 32-d composites from March 2002 to February 2003.

View larger version (12K): [in this window] [in a new window]   Fig. 3. Range of estimated corn area (ha) from 30 parsimonious regression tree models. Dashed line and dots are NASS census values. Boxes and bars represent ± 25% and ± 45% of median, respectively. The x axis is sorted by NASS 2002 census.

View larger version (72K): [in this window] [in a new window]   Fig. 4. Corn field maps based on (a) 500-m MODIS and (b) NASS 2002 census.

View larger version (20K): [in this window] [in a new window]   Fig. 5. Validation of 500-m MODIS regression tree model for corn field areas (ha) with NASS 2002 census data at (a) county level and (b) state level. Dashed line is 1:1. ** Significant at P 0.01.

View larger version (15K): [in this window] [in a new window]   Fig. 6. Seasonal changes of NDVI for soybean fields, where (a) is high (>50%) soybean field density and (b) is low (<25%) soybean field density pixels using 32-d composites from March 2002 to February 2003.

View larger version (11K): [in this window] [in a new window]   Fig. 7. Range of estimated soybean area (ha) from 30 parsimonious regression tree models. Dashed line and dots are NASS census values. Boxes and bars represent ±25% and ±45% of median, respectively. The x axis is sorted by NASS 2002 census.

View larger version (86K): [in this window] [in a new window]   Fig. 8. Soybean field maps based on (a) 500-m MODIS and (b) NASS 2002 census.

View larger version (18K): [in this window] [in a new window]   Fig. 9. Validation of 500-m MODIS regression tree model for soybean field areas (ha) with NASS 2002 census data in (a) county level and (b) state level. Dashed line is 1:1. ** Significant at P 0.01.

View larger version (11K): [in this window] [in a new window]   Fig. 10. Ranges of corn and soybean field areas (ha) summed from 30 parsimonious regression tree models per crop type. Dashed line and dots are NASS census values. Boxes and bars represent ±25% and ±45% of median, respectively. The x axis is sorted by NASS 2002 census.

View larger version (18K): [in this window] [in a new window]   Fig. 11. Validation of 500-m MODIS regression tree model for corn plus soybean field areas (ha) with NASS 2002 census data at (a) county level and (b) state level. Dashed line is 1:1. ** Significant at P 0.01.