If the following table does not display properly, then please visit the following website to view the original metadata file <https://www.nass.usda.gov/Research_and_Science/Cropland/metadata/meta.php>.
USDA, National Agricultural Statistics Service, 2021 California Cropland Data Layer
STATEWIDE AGRICULTURAL ACCURACY REPORT
Crop-specific covers only *Correct Accuracy Error Kappa
------------------------- ------- -------- ------ -----
FSA Crops 401,930 78.4% 21.6% 0.766
Cover Attribute *Correct Producer's Omission User's Commission Cond'l
Type Code Pixels Accuracy Error Kappa Accuracy Error Kappa
---- ---- ------ -------- ----- ----- -------- ----- -----
Corn 1 11,079 69.9% 30.1% 0.695 77.5% 22.5% 0.771
Cotton 2 14,120 85.6% 14.4% 0.853 84.9% 15.1% 0.846
Rice 3 59,542 97.4% 2.6% 0.972 99.0% 1.0% 0.989
Sorghum 4 154 13.8% 86.2% 0.138 48.7% 51.3% 0.487
Sunflower 6 3,977 77.5% 22.5% 0.774 76.1% 23.9% 0.760
Sweet Corn 12 409 44.9% 55.1% 0.449 66.3% 33.7% 0.663
Pop or Orn Corn 13 6 23.1% 76.9% 0.231 35.3% 64.7% 0.353
Mint 14 136 70.5% 29.5% 0.705 69.7% 30.3% 0.697
Barley 21 2,466 57.6% 42.4% 0.575 75.2% 24.8% 0.751
Durum Wheat 22 1,498 63.6% 36.4% 0.635 72.1% 27.9% 0.720
Spring Wheat 23 141 15.5% 84.5% 0.155 73.1% 26.9% 0.730
Winter Wheat 24 20,177 68.5% 31.5% 0.675 69.4% 30.6% 0.685
Rye 27 647 34.9% 65.1% 0.348 59.2% 40.8% 0.591
Oats 28 1,925 40.6% 59.4% 0.404 52.5% 47.5% 0.523
Millet 29 0 n/a n/a n/a 0.0% 100.0% 0.000
Canola 31 0 0.0% 100.0% 0.000 0.0% 100.0% 0.000
Safflower 33 2,984 75.8% 24.2% 0.757 81.8% 18.2% 0.817
Alfalfa 36 63,178 86.5% 13.5% 0.854 81.7% 18.3% 0.803
Other Hay/Non Alfalfa 37 10,869 62.1% 37.9% 0.615 70.4% 29.6% 0.699
Buckwheat 39 0 n/a n/a n/a 0.0% 100.0% 0.000
Sugarbeets 41 2,162 77.4% 22.6% 0.773 64.5% 35.5% 0.644
Dry Beans 42 219 34.2% 65.8% 0.341 38.4% 61.6% 0.383
Potatoes 43 414 60.8% 39.2% 0.608 68.7% 31.3% 0.686
Other Crops 44 390 39.6% 60.4% 0.395 82.1% 17.9% 0.821
Sugarcane 45 0 n/a n/a n/a 0.0% 100.0% 0.000
Sweet Potatoes 46 0 0.0% 100.0% 0.000 0.0% 100.0% 0.000
Misc Vegs & Fruits 47 8 8.0% 92.0% 0.080 13.6% 86.4% 0.136
Watermelons 48 89 10.5% 89.5% 0.105 28.1% 71.9% 0.280
Onions 49 2,327 62.3% 37.7% 0.622 66.7% 33.3% 0.666
Cucumbers 50 81 26.0% 74.0% 0.260 35.4% 64.6% 0.354
Chick Peas 51 238 61.5% 38.5% 0.615 54.2% 45.8% 0.542
Lentils 52 0 0.0% 100.0% 0.000 n/a n/a n/a
Peas 53 32 7.6% 92.4% 0.076 32.7% 67.3% 0.326
Tomatoes 54 23,483 83.3% 16.7% 0.829 83.8% 16.2% 0.834
Herbs 57 148 29.4% 70.6% 0.293 32.7% 67.3% 0.326
Clover/Wildflowers 58 2,465 89.3% 10.7% 0.893 93.7% 6.3% 0.936
Sod/Grass Seed 59 180 24.8% 75.2% 0.247 45.7% 54.3% 0.456
Fallow/Idle Cropland 61 46,273 85.3% 14.7% 0.844 84.4% 15.6% 0.835
Cherries 66 891 81.2% 18.8% 0.812 79.8% 20.2% 0.797
Peaches 67 47 19.7% 80.3% 0.197 42.3% 57.7% 0.423
Apples 68 12 80.0% 20.0% 0.800 13.2% 86.8% 0.132
Grapes 69 7,933 82.5% 17.5% 0.823 74.2% 25.8% 0.739
Other Tree Crops 71 45 3.2% 96.8% 0.031 4.8% 95.2% 0.046
Citrus 72 418 12.6% 87.4% 0.123 10.2% 89.8% 0.099
Pecans 74 13 28.3% 71.7% 0.283 36.1% 63.9% 0.361
Almonds 75 55,592 90.1% 9.9% 0.894 87.5% 12.5% 0.867
Walnuts 76 14,763 88.7% 11.3% 0.885 88.2% 11.8% 0.880
Pears 77 185 81.5% 18.5% 0.815 92.5% 7.5% 0.925
Pistachios 204 22,996 89.1% 10.9% 0.888 89.7% 10.3% 0.894
Triticale 205 3,665 43.8% 56.2% 0.435 65.0% 35.0% 0.647
Carrots 206 693 39.4% 60.6% 0.393 56.0% 44.0% 0.559
Asparagus 207 0 n/a n/a n/a 0.0% 100.0% 0.000
Garlic 208 1,499 59.3% 40.7% 0.593 74.9% 25.1% 0.748
Cantaloupes 209 205 24.6% 75.4% 0.245 38.6% 61.4% 0.386
Olives 211 1,530 72.1% 27.9% 0.721 85.7% 14.3% 0.856
Oranges 212 378 29.8% 70.2% 0.298 91.3% 8.7% 0.913
Honeydew Melons 213 179 35.7% 64.3% 0.357 46.1% 53.9% 0.461
Broccoli 214 86 10.1% 89.9% 0.101 28.5% 71.5% 0.284
Avocados 215 45 81.8% 18.2% 0.818 29.0% 71.0% 0.290
Peppers 216 46 22.1% 77.9% 0.221 27.4% 72.6% 0.274
Pomegranates 217 1,216 92.1% 7.9% 0.920 93.2% 6.8% 0.932
Nectarines 218 30 27.3% 72.7% 0.273 50.0% 50.0% 0.500
Greens 219 440 46.7% 53.3% 0.466 49.3% 50.7% 0.493
Plums 220 425 47.8% 52.2% 0.478 56.7% 43.3% 0.566
Strawberries 221 9 36.0% 64.0% 0.360 56.3% 43.8% 0.562
Squash 222 19 16.8% 83.2% 0.168 40.4% 59.6% 0.404
Vetch 224 2 9.5% 90.5% 0.095 2.8% 97.2% 0.028
Dbl Crop WinWht/Corn 225 10,648 63.7% 36.3% 0.630 59.6% 40.4% 0.590
Dbl Crop Oats/Corn 226 1,672 48.9% 51.1% 0.488 58.6% 41.4% 0.585
Lettuce 227 388 16.9% 83.1% 0.168 38.9% 61.1% 0.387
Dbl Crop Triticale/Corn 228 3,463 53.9% 46.1% 0.536 56.6% 43.4% 0.563
Pumpkins 229 11 34.4% 65.6% 0.344 21.2% 78.8% 0.212
Dbl Crop Lettuce/Cantaloup 231 0 0.0% 100.0% 0.000 0.0% 100.0% 0.000
Dbl Crop Lettuce/Cotton 232 0 0.0% 100.0% 0.000 n/a n/a n/a
Dbl Crop WinWht/Sorghum 236 380 41.3% 58.7% 0.412 50.9% 49.1% 0.509
Dbl Crop Barley/Corn 237 66 19.2% 80.8% 0.192 35.3% 64.7% 0.353
Dbl Crop WinWht/Cotton 238 1 2.4% 97.6% 0.024 33.3% 66.7% 0.333
Blueberries 242 0 0.0% 100.0% 0.000 0.0% 100.0% 0.000
Cabbage 243 90 61.2% 38.8% 0.612 62.5% 37.5% 0.625
Cauliflower 244 32 7.5% 92.5% 0.075 31.7% 68.3% 0.317
Celery 245 0 0.0% 100.0% 0.000 0.0% 100.0% 0.000
Turnips 247 0 n/a n/a n/a 0.0% 100.0% 0.000
Gourds 249 0 0.0% 100.0% 0.000 n/a n/a n/a
*Correct Pixels represents the total number of independent validation pixels correctly identified in the error matrix.
**The Overall Accuracy represents only the FSA row crops and annual fruit and vegetables (codes 1-61, 66-80, 92 and 200-255).
FSA-sampled grass and pasture. Non-agricultural and NLCD-sampled categories (codes 62-65, 81-91 and 93-199) are not included in the Overall Accuracy.
The accuracy of the non-agricultural land cover classes within the Cropland Data Layer is entirely dependent upon the USGS, National Land Cover Database. Thus, the USDA, NASS recommends that users consider the NLCD for studies involving non-agricultural land cover. For more information on the accuracy of the NLCD please reference <https://www.mrlc.gov/>.
Attribute_Accuracy_Value:
Classification accuracy 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 strength and emphasis of the CDL is crop-specific land cover categories. The accuracy of the CDL non-agricultural land cover classes is entirely dependent upon the USGS, National Land Cover Database. Thus, the USDA, NASS recommends that users consider the NLCD for studies involving non-agricultural land cover.
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.