USDA-NASS Cropland Data Layer: Illinois 2007
The United States Department of Agriculture, National Agricultural Statistics Service (USDA-NASS) Cropland Data Layer (CDL), or NASS Cropland Data Layer, for Illinois is a raster, geo-referenced, categorized land cover data layer. From 1999-2006, the emphasis of the CDL data product has been agricultural land cover. Beginning in 2007, NASS instituted a new classification protocol for an enhanced Cropland Data Layer data product that characterizes both agricultural and non-agricultural lands. The resulting Illinois 2007 CDL is a comprehensive, statewide land cover data product which will be produced by NASS on annual basis.
Prior to 2006, the CDL data layer was produced using Landsat 5 Thematic Mapper (TM) and Landsat 7 Enhanced Thematic Mapper (ETM+) satellite imagery with a ground resolution of 30 x 30 meters. Because of reliability and sensor difficulties with Landsats 5 and 7, the CDL data product is now produced using satellite imagery from the Indian Remote Sensing RESOURCESAT-1 Advanced Wide Field Sensor (AWiFS), which has a ground resolution of 56 x 56 meters. Ancillary classification inputs include: the United States Geological Survey (USGS) National Elevation Dataset (NED), the USGS National Land Cover Dataset 2001 (NLCD 2001), and the National Aeronautics and Space Administration (NASA) Moderate Resolution Imaging Spectroradiometer (MODIS) 250 meter 16 day Normalized Difference Vegetation Index (NDVI) composites. Agricultural training and validation data are derived from the Farm Service Agency (FSA) Common Land Unit (CLU) Program. The NLCD 2001 is used as non-agricultural training and validation data.
Download NASS data for Illinois
- 2007 Midwest CDL (Original) (300Mb)
Because the Illinois 2007 CDL is a marked departure from previous NASS CDL data products, remote sensing scientists from the Illinois State Geological Survey, the Illinois Natural History Survey, and USDA NASS conducted a formal accuracy assessment of the Illinois 2007 CDL land cover data product. The results of the statistical analyses are contained in the project report:
The statistical analysis determined that certain land cover categories from the original Illinois 2007 NASS CDL data product should be aggregated. ISGS and INHS scientists created a revised version of the CDL data product and also applied a color-coding scheme similar to that for the 1999-2000 Illinois Land Cover data product.
- Revised 2007 Illinois CDL (IMG and GeoTIFF 20.2Mb)
Download NASS maps for Illinois
In addition to these original GIS data products, a GeoPDF map of the Revised 2007 Illinois CDL is available for download. A GeoPDF is a special type of PDF, affording both visualization of the land cover information, as well as providing the user some basic GIS functions. Only Adobe Acrobat Reader is needed to view the GeoPDF map, but you must download a free GIS toolbar for Acrobat Reader, which is available for free download from TerraGo Technologies. Toolbar documentation and a GeoPDF tutorial are also available.
- Revised 2007 Illinois CDL Map_GeoPDF.pdf (53.6 Mb) (GeoPDF version)
- Revised 2007 Illinois CDL Map.pdf (7.5 Mb) (conventional PDF version)
Purpose
The purpose of the Illinois Cropland Data Layer Program is to use satellite imagery on an annual basis to provide supplemental acreage estimates for the state's major commodities, and to produce digital, crop specific, categorized geo-referenced output products. These data are intended for geographic display and analysis at the state level. The cropland data layers are provided as is. USDA-NASS does not warrant results you may obtain using the data.
Copyright Restrictions
There are NO copyright restrictions with the NASS Cropland Data Layer imagery. The categorized imagery is considered public domain and free to redistribute. However, NASS would appreciate acknowledgment or credit for the usage of our categorized imagery.
Attributes
The following is a cross-reference list of the categorization codes and land covers used in all states involved in the Cropland Data Layer Program. Not all land cover categories listed below will appear in an individual state; the Illinois Cropland Data Layer uses 13 of these categories.
| Attribute Domain Values and Definitions ROW CROPS 1-20 |
|
|---|---|
| Categorization Code | Land Cover |
| 1 | Corn |
| 2 | Cotton |
| 3 | Rice |
| 4 | Sorghum |
| 5 | Soybeans |
| 6 | Sunflowers |
| 10 | Peanuts |
| 11 | Tobacco |
| Raster Attribute Domain Values and Definitions GRAINS,HAY,SEEDS 21-40 |
|
| Categorization Code | Land Cover |
| 21 | Barley |
| 22 | Durum Wheat |
| 23 | Spring Wheat |
| 24 | Winter Wheat |
| 25 | Other Small Grains |
| 26 | Winter Wheat/Soybeans Double Cropped |
| 27 | Rye |
| 28 | Oats |
| 29 | Millet |
| 30 | Speltz |
| 31 | Canola |
| 32 | Flaxseed |
| 33 | Safflower |
| 34 | Rape seed |
| 35 | Mustard |
| 36 | Alfalfa |
| 37 | Other Hays |
| Raster Attribute Domain Values and Definitions OTHER CROPS 41-60 |
|
| Categorization Code | Land Cover |
| 41 | Sugarbeets |
| 42 | Dry Beans |
| 43 | Potatoes |
| 44 | Other Crops |
| 45 | Sugarcane |
| 46 | Sweet Potatoes |
| 47 | Miscellaneous Vegetables & Fruit |
| 48 | Watermelon |
| 50 | Pickles |
| 51 | Chick Peas |
| 52 | Lentils |
| 53 | Peas |
| 58 | Clover/Wildflowers |
| Raster Attribute Domain Values and Definitions OPEN NON-CROP 61-65 | |
| Categorization Code | Land Cover |
| 61 | Fallow/Idle Cropland |
| 62 | Grass/Pasture//Non-agricultural |
| 63 | Woodland |
| 64 | Shrubland |
| 65 | Barren |
| Raster Attribute Domain Values and Definitions OPEN NON-CROP 66-80 | |
| Categorization Code | Land Cover |
| 67 | Peaches |
| 68 | Apples |
| 69 | Grapes |
| 70 | Christmas Trees |
| 71 | Other Tree Nuts & Fruit |
| 72 | Citrus |
| 73 | Other Tree Fruit |
| 70 | Other Non-Tree Fruit |
| Raster Attribute Domain Values and Definitions OTHER 81-99 | |
| Categorization Code | Land Cover |
| 81 | Clouds |
| 82 | Urban/Developed |
| 83 | Water |
| 87 | Wetlands |
| 92 | Aquaculture |
| Raster Attribute Domain Values and Definitions NLCD-DERIVED NON-CROP 100-195 | |
| Categorization Code | Land Cover |
| 111 | NLCD - Open Water |
| 112 | NLCD - Perennial Ice, Snow |
| 121 | NLCD - Developed/Open Space |
| 122 | NLCD - Developed/Low Intensity |
| 123 | NLCD - Developed/Medium Intensity |
| 124 | NLCD - Developed/High Intensity |
| 131 | NLCD - Barren |
| 141 | NLCD - Deciduous Forest (Revised Illinois CDL incorporates #143-Mixed Forest and #63-Woodland) |
| 142 | NLCD - Evergreen Forest |
| 143 | NLCD - Mixed Forest |
| 152 | NLCD - Shrubland |
| 171 | NLCD - Grassland Herbaceous (Revised Illinois CDL incorporates #152-Shrub/Scrub, #181-Pasture/Hay, and #62-Grassland/Pasture/Non-Ag) |
| 181 | NLCD - Pasture/Hay |
| 182 | NLCD - Cultivated Crop |
| 190 | NLCD - Woody Wetlands |
| 195 | NLCD - Herbaceous Wetlands (Revised Illinois CDL incorporates #87-Wetlands) |