USDA, National Agricultural Statistics Service, 2020 Crop Frequency Layers for CORN, COTTON, SOYBEANS AND WHEAT
BASED ON THE 2008-2020 CROPLAND DATA LAYERS (13 YEARS OF DATA)
NATIONAL ACCURACY REPORTS
CORN
Cover Attribute *Correct Producer's Omission User's Commission Cond'l
Type Code Pixels Accuracy Error Kappa Accuracy Error Kappa
---- ---- -------- --------- ----- ----- -------- ------- -----
Planted 1 time in 13 years 1 1,966,120 82.3% 17.7% 0.816 76.7% 23.3% 0.758
Planted 2 times in 13 years 2 1,587,180 77.2% 22.8% 0.765 76.8% 23.2% 0.760
Planted 3 times in 13 years 3 1,574,620 71.6% 28.4% 0.707 74.3% 25.7% 0.734
Planted 4 times in 13 years 4 2,001,110 73.3% 26.7% 0.721 73.3% 26.7% 0.721
Planted 5 times in 13 years 5 2,742,160 70.5% 29.5% 0.687 73.1% 26.9% 0.713
Planted 6 times in 13 years 6 10,505,800 87.0% 13.0% 0.841 88.3% 11.7% 0.857
Planted 7 times in 13 years 7 11,055,800 91.1% 8.9% 0.890 89.2% 10.8% 0.867
Planted 8 times in 13 years 8 3,180,270 87.1% 12.9% 0.863 82.0% 18.0% 0.809
Planted 9 times in 13 years 9 2,363,300 89.3% 10.7% 0.888 87.6% 12.4% 0.871
Planted 10 times in 13 years 10 1,516,790 89.4% 10.6% 0.891 88.1% 11.9% 0.878
Planted 11 times in 13 years 11 1,057,540 89.7% 10.3% 0.895 89.1% 10.9% 0.889
Planted 12 times in 13 years 12 758,577 90.3% 9.7% 0.902 88.2% 11.8% 0.881
Planted 13 times in 13 years 13 960,320 92.5% 7.5% 0.924 97.2% 2.8% 0.971
COTTON
Cover Attribute *Correct Producer's Omission User's Commission Cond'l
Type Code Pixels Accuracy Error Kappa Accuracy Error Kappa
---- ---- -------- --------- ----- ----- -------- ------- -----
Planted 1 time in 13 years 1 321,533 82.8% 17.2% 0.827 72.0% 28.0% 0.718
Planted 2 times in 13 years 2 201,569 80.4% 19.6% 0.803 77.1% 22.9% 0.770
Planted 3 times in 13 years 3 152,129 78.8% 21.2% 0.788 78.7% 21.3% 0.786
Planted 4 times in 13 years 4 119,919 78.2% 21.8% 0.781 77.2% 22.8% 0.772
Planted 5 times in 13 years 5 90,372 73.3% 26.7% 0.732 73.9% 26.1% 0.738
Planted 6 times in 13 years 6 83,661 74.8% 25.2% 0.748 78.9% 21.1% 0.788
Planted 7 times in 13 years 7 63,738 76.4% 23.6% 0.763 76.1% 23.9% 0.761
Planted 8 times in 13 years 8 43,105 69.7% 30.3% 0.696 74.5% 25.5% 0.745
Planted 9 times in 13 years 9 34,126 74.3% 25.7% 0.742 72.6% 27.4% 0.726
Planted 10 times in 13 years 10 25,382 71.6% 28.4% 0.716 72.8% 27.2% 0.728
Planted 11 times in 13 years 11 19,498 67.6% 32.4% 0.676 71.7% 28.3% 0.717
Planted 12 times in 13 years 12 25,098 82.6% 17.4% 0.826 75.1% 24.9% 0.751
Planted 13 times in 13 years 13 41,458 87.1% 12.9% 0.871 96.0% 4.0% 0.960
SOYBEANS
Cover Attribute *Correct Producer's Omission User's Commission Cond'l
Type Code Pixels Accuracy Error Kappa Accuracy Error Kappa
---- ---- -------- --------- ----- ----- -------- ------- -----
Planted 1 time in 13 years 1 1,645,060 81.7% 18.3% 0.811 78.2% 21.8% 0.775
Planted 2 times in 13 years 2 1,713,800 81.2% 18.8% 0.806 81.6% 18.4% 0.810
Planted 3 times in 13 years 3 2,187,140 81.4% 18.6% 0.806 82.4% 17.6% 0.816
Planted 4 times in 13 years 4 3,075,290 82.7% 17.3% 0.816 83.0% 17.0% 0.820
Planted 5 times in 13 years 5 4,224,940 77.7% 22.3% 0.758 80.4% 19.6% 0.787
Planted 6 times in 13 years 6 12,357,800 87.8% 12.2% 0.846 88.9% 11.1% 0.858
Planted 7 times in 13 years 7 10,226,000 89.4% 10.6% 0.871 88.2% 11.8% 0.857
Planted 8 times in 13 years 8 1,614,530 76.1% 23.9% 0.753 70.0% 30.0% 0.690
Planted 9 times in 13 years 9 859,782 75.5% 24.5% 0.751 71.8% 28.2% 0.713
Planted 10 times in 13 years 10 410,483 70.1% 29.9% 0.698 66.2% 33.8% 0.659
Planted 11 times in 13 years 11 272,442 66.8% 33.2% 0.666 65.6% 34.4% 0.654
Planted 12 times in 13 years 12 208,862 74.7% 25.3% 0.746 65.0% 35.0% 0.648
Planted 13 times in 13 years 13 231,114 83.9% 16.1% 0.838 78.4% 21.6% 0.783
WHEAT
Cover Attribute *Correct Producer's Omission User's Commission Cond'l
Type Code Pixels Accuracy Error Kappa Accuracy Error Kappa
---- ---- -------- --------- ----- ----- -------- ------- -----
Planted 1 time in 13 years 1 3,197,440 85.9% 14.1% 0.851 84.0% 16.0% 0.830
Planted 2 times in 13 years 2 1,867,770 76.3% 23.7% 0.754 79.4% 20.6% 0.786
Planted 3 times in 13 years 3 1,565,750 63.4% 36.6% 0.622 73.9% 26.1% 0.728
Planted 4 times in 13 years 4 1,835,750 65.9% 34.1% 0.644 67.6% 32.4% 0.662
Planted 5 times in 13 years 5 1,585,740 64.4% 35.6% 0.629 63.2% 36.8% 0.618
Planted 6 times in 13 years 6 2,631,690 79.6% 20.4% 0.784 75.2% 24.8% 0.739
Planted 7 times in 13 years 7 2,189,490 83.3% 16.7% 0.826 79.3% 20.7% 0.785
Planted 8 times in 13 years 8 704,839 71.6% 28.4% 0.712 68.5% 31.5% 0.680
Planted 9 times in 13 years 9 560,956 71.5% 28.5% 0.712 68.7% 31.3% 0.683
Planted 10 times in 13 years 10 340,995 68.4% 31.6% 0.681 62.2% 37.8% 0.619
Planted 11 times in 13 years 11 278,849 59.0% 41.0% 0.587 62.2% 37.8% 0.619
Planted 12 times in 13 years 12 221,075 64.5% 35.5% 0.643 61.8% 38.2% 0.616
Planted 13 times in 13 years 13 424,847 87.2% 12.8% 0.871 69.3% 30.7% 0.690
*Correct Pixels represents the total number of independent validation pixels correctly identified in the error matrix.
Attribute_Accuracy_Value:
The Crop Frequency Layer is based on the Cropland Data Layer (CDL). The classification accuracy of the original CDLs is generally 85% to 95% correct for the major crop-specific land cover categories. See the 'Attribute Accuracy Report' section of this metadata file for the detailed accuracy report.
Attribute_Accuracy_Explanation:
The accuracy assessment of the Crop Frequency Layers use the entire FSA CLU data (agricultural categories) that was used in the training and validation of the original Cropland Data Layers (CDL). Only FSA data that exists in all 13 years (2008-2020) is used for validating the Crop Frequency Layers. See the 'Attribute Accuracy Report' section of this metadata file for the full accuracy report.
These definitions of accuracy statistics were derived from the following book: Congalton, Russell G. and Kass Green. Assessing the Accuracy of Remotely Sensed Data: Principles and Practices. Boca Raton, Florida: CRC Press, Inc. 1999. The 'Producer's Accuracy' is calculated for each cover type in the ground truth and indicates the probability that a ground truth pixel will be correctly mapped (across all cover types) and measures 'errors of omission'. An 'Omission Error' occurs when a pixel is excluded from the category to which it belongs in the validation dataset. The 'User's Accuracy' indicates the probability that a pixel from the CDL classification actually matches the ground truth data and measures 'errors of commission'. The 'Commission Error' represent when a pixel is included in an incorrect category according to the validation data. It is important to take into consideration errors of omission and commission. For example, if you classify every pixel in a scene to 'wheat', then you have 100% Producer's Accuracy for the wheat category and 0% Omission Error. However, you would also have a very high error of commission as all other crop types would be included in the incorrect category. The 'Kappa' is a measure of agreement based on the difference between the actual agreement in the error matrix (i.e., the agreement between the remotely sensed classification and the reference data as indicated by the major diagonal) and the chance agreement which is indicated by the row and column totals. The 'Conditional Kappa Coefficient' is the agreement for an individual category within the entire error matrix.