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:

2007_Illinois_Land_Cover_Project_Report.zip (7.0Mb)

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


Revised 2007 Illinois CDL Map

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
2Cotton
3Rice
4Sorghum
5Soybeans
6Sunflowers
10Peanuts
11 Tobacco
Raster Attribute Domain Values and Definitions
GRAINS,HAY,SEEDS 21-40
Categorization Code Land Cover
21Barley
22Durum Wheat
23Spring Wheat
24Winter Wheat
25Other Small Grains
26Winter Wheat/Soybeans Double Cropped
27Rye
28Oats
29Millet
30Speltz
31Canola
32Flaxseed
33Safflower
34Rape seed
35Mustard
36Alfalfa
37Other Hays
Raster Attribute Domain Values and Definitions
OTHER CROPS 41-60
Categorization CodeLand Cover
41Sugarbeets
42Dry Beans
43Potatoes
44Other Crops
45Sugarcane
46Sweet Potatoes
47Miscellaneous Vegetables & Fruit
48Watermelon
50Pickles
51Chick Peas
52Lentils
53Peas
58Clover/Wildflowers
Raster Attribute Domain Values and Definitions
OPEN NON-CROP 61-65
Categorization CodeLand Cover
61Fallow/Idle Cropland
62Grass/Pasture//Non-agricultural
63Woodland
64Shrubland
65Barren
Raster Attribute Domain Values and Definitions
OPEN NON-CROP 66-80
Categorization CodeLand Cover
67Peaches
68Apples
69Grapes
70Christmas Trees
71Other Tree Nuts & Fruit
72Citrus
73Other Tree Fruit
70Other Non-Tree Fruit
Raster Attribute Domain Values and Definitions
OTHER 81-99
Categorization CodeLand Cover
81Clouds
82Urban/Developed
83Water
87 Wetlands
92Aquaculture
Raster Attribute Domain Values and Definitions
NLCD-DERIVED NON-CROP 100-195
Categorization CodeLand Cover
111NLCD - Open Water
112NLCD - Perennial Ice, Snow
121NLCD - Developed/Open Space
122NLCD - Developed/Low Intensity
123NLCD - Developed/Medium Intensity
124NLCD - Developed/High Intensity
131NLCD - Barren
141NLCD - Deciduous Forest (Revised Illinois CDL incorporates #143-Mixed Forest and #63-Woodland)
142NLCD - Evergreen Forest
143NLCD - Mixed Forest
152NLCD - Shrubland
171NLCD - Grassland Herbaceous (Revised Illinois CDL incorporates #152-Shrub/Scrub, #181-Pasture/Hay, and #62-Grassland/Pasture/Non-Ag)
181NLCD - Pasture/Hay
182NLCD - Cultivated Crop
190NLCD - Woody Wetlands
195NLCD - Herbaceous Wetlands (Revised Illinois CDL incorporates #87-Wetlands)