USDA-NASS Cropland Data Layer Illinois 2007 | clearinghouse.isgs.illinois.edu

Data

Summary

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 (see below).

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.

Data

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)

In addition to these original GIS data products, a GeoPDF map of the Revised 2007 Illinois CDL is available for download (see below). 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(link is external), which is available for free download from TerraGo Technologies. Toolbar documentation and a GeoPDF tutorial(link is external) are also available.