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2005 Mid-Western Cropland Data Layer
Illinois, Indiana, Iowa, Nebraska, North Dakota and Wisconsin
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This DVD includes categorized images from the Landsat 5 satellite for the specified state. The images have been labeled as specific crop types for the cultivated cropland areas of the state. Ancillary data layers obtained from the National Atlas program are provided for viewing purposes. Image browsing freeware software ArcReader is provided.
The non-cropland areas are broadly defined to complete the area coverage and are not accurate non-cropland land cover maps. Thus, for the cropland areas and categories, the performance statistics and the accuracy levels and measurements for the categorization are considerably more meaningful than for non-cropland areas and categories.
The categorization is provided in a graphic image format for viewing, including zoom-in capability. Beyond viewing the graphic images, the actual labeled or categorized Landsat 5 pixels are included as a geographic information systems “GeoTIFF” data layer.
ArcReader 9.1 is a
freeware GIS and image viewing tool, available from the Environmental Systems
Research Institute. Additional
information about the software can be found at http://www.esri.com/arcreader. A copy of the software is provided to load
onto your desktop in the \Programs directory of the DVD.
Users who already have
ArcGIS installed on their Desktop systems may consider using the \MapDocuments
folder to load the premade ArcGIS .mxd project of each state. If preinstalled
ArcGIS users try to install ArcReader, they will be asked to remove the ArcGIS
installation from their computer, this is not a recommended course of action!
For non ArcGIS users,
ArcReader can be loaded onto your PC Desktop system, it is possible to load the
premade Published Map Documents from the \PublishedMapDocuments folder. A
separate project for each Cropland Data Layer (CDL) is provided in the
\Programs folder and is named XX.pmf where XX is the State abbreviation. The Project includes: the CDL, shapefiles of NASS’s
Agricultural Statistics District boundaries, the Land Use Stratification from
NASS’s Area Sampling Frame, county boundaries, primary/secondary roads,
hydrology features, state boundaries and railroad lines at the National Atlas level of 1:2,000,000.
Uncompressed versions of the categorized images are located in the \CDL directory in GEOTIFF format. Uncompressed ERDAS Imagine version 8.7 files are available in the \CDL directory in the files xx05_tm_cdl.img where xx is the two letter state abbreviation.
All
images across all states have a master set of digital numbers or codes.
To view these codes open mastercat.htm.
Some codes are state specific, but the colors will vary across states to maximize
the contrast between crops and non-agricultural areas.
The
STATINFO subdirectories contain category lists and statistical information for
the analysis used. Reliability statistics include percent correct,
commission error, kappa coefficient, regression r-squared, and regression
slope.
Accuracy Assessments |
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Acreage Estimation & Cropland Data Layer Demo
This graphical
presentation provides an overview of the Acreage Estimation Program, and the Cropland
Data Layer in
.html format. It is best viewed at 1024 x 768 or greater resolution using
Microsoft Internet Explorer.
FAQ’s Frequently Anticipated Questions
Here’s
a FAQ list
to help answer some of your questions or concerns.
Here's the metadata description of the images used for the CDL.
State Metadata |
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