Homer, C., C. Huang, L. Yang, B. Wylie and M. Coan, 2004. Development of a 2001 national land cover database for the United States. Photogrammetric Engineering and Remote Sensing.
The USGS acknowledges the support of MDA Federal Inc. in development of data in this zone.
The NLCD 2001 was created by partitioning the U.S. into mapping zones. A total of 66 mapping zones were delineated within the conterminous U.S. based on ecoregion and geographical characteristics, edge matching features and the size requirement of Landsat mosaics. Mapping zone 30 encompasses whole or portions of several states including Montana, South Dakota and North Dakota. Questions about the NLCD mapping zone 30 can be directed to the NLCD 2001 land cover mapping team at the USGS/EROS, Sioux Falls, SD (605) 594-6151 or mrlc@usgs.gov.
By combining the training data with Landsat spectral data and other ancillary data, percent imperviousness prediction models were developed using a regression tree algorithm (named "Cubist"). All data layers used as input for running the Cubist in order to establish the prediction model for imperviousness are listed in the "Supplemental Information" section. Three ancillary data sets were used for urban/suburban delineation masking, which is essential to confine the imperviousness mapping within the developed areas.
After the best combination of possible input data layers had been determined and the final percent impervious layer produced, the urban mask created was used to eliminate those pixels from the final percent impervious file that fall outside identified impervious surface areas. Thus, the impervious pixels identified within the mask were retained, while all non-impervious surface pixels were removed from the final product. This corrected for any small areas of pixels that may have been included as part of the impervious surface layer because their spectral signature was not covered in the Cubist modeling process. Finally, visual inspection of imperviousness layer was made with limited manual editing to eliminate non-urban areas based on area of interest delineated by the mapping team.
Acquisition dates of Landsat ETM+ (TM) scenes used for land cover classification in zone 30 are as follows:
SPRING-
Index 1 for Path 32/Row 28 on 05/02/00 = Scene_ID 7032028000012350
Index 1 for Path 32/Row 29 on 05/02/00 = Scene_ID 7032029000012350
Index 2 for Path 33/Row 27 on 05/12/01 = Scene_ID 7033027000113250
Index 3 for Path 33/Row 28 on 05/01/00 = Scene_ID 5033028000012210
Index 3 for Path 33/Row 29 on 05/01/00 = Scene_ID 5033029000012210
Index 4 for Path 34/Row 26 on 04/30/00 = Scene_ID 7034026000012150
Index 4 for Path 34/Row 27 on 04/30/00 = Scene_ID 7034027000012150
Index 5 for Path 34/Row 28 on 04/25/01 = Scene_ID 5034028000111510
Index 5 for Path 34/Row 29 on 04/25/01 = Scene_ID 5034029000111510
Index 6 for Path 35/Row 26 on 05/13/02 = Scene_ID 7035026000213350
Index 6 for Path 35/Row 27 on 05/13/02 = Scene_ID 7035027000213350
Index 7 for Path 36/Row 26 on 04/20/00 = Scene_ID 5036026000011110
Index 8 for Path 36/Row 27 on 03/27/00 = Scene_ID 7036027000008750
Index 9 for Path 36/Row 28 on 05/17/01 = Scene_ID 7036028000113750
LEAF ON (Summer)-
Index 1 for Path 32/Row 28 on 08/25/01 = Scene_ID 7032028000123750
Index 1 for Path 32/Row 29 on 08/25/01 = Scene_ID 7032029000123750
Index 2 for Path 33/Row 27 on 07/12/00 = Scene_ID 7033027000019450
Index 2 for Path 33/Row 28 on 07/12/00 = Scene_ID 7033028000019450
Index 2 for Path 33/Row 29 on 07/12/00 = Scene_ID 7033029000019450
Index 3 for Path 34/Row 27 on 07/06/01 = Scene_ID 7034027000118750
Index 4 for Path 34/Row 28 on 07/22/01 = Scene_ID 7034028000120350
Index 5 for Path 34/Row 29 on 07/09/02 = Scene_ID 7034029000219050
Index 6 for Path 35/Row 27 on 06/30/02 = Scene_ID 7035027000218150
Index 7 for Path 36/Row 27 on 08/18/00 = Scene_ID 7036027000023150
Index 8 for Path 36/Row 27 on 08/19/03 = Scene_ID 5036027000323110
Index 8 for Path 36/Row 28 on 08/19/03 = Scene_ID 5036028000323110
LEAF-OFF (Fall)-
Index 1 for Path 32/Row 28 on 09/26/01 = Scene_ID 7032028000126950
Index 2 for Path 32/Row 29 on 09/05/02 = Scene_ID 5032029000224810
Index 3 for Path 33/Row 27 on 09/14/00 = Scene_ID 7033027000025850
Index 4 for Path 33/Row 28 on 09/25/01 = Scene_ID 5033028000126810
Index 3 for Path 33/Row 29 on 09/14/00 = Scene_ID 7033029000025850
Index 5 for Path 34/Row 26 on 10/23/00 = Scene_ID 7034026000029750
Index 6 for Path 34/Row 27 on 10/07/00 = Scene_ID 7034027000028150
Index 6 for Path 34/Row 28 on 10/07/00 = Scene_ID 7034028000028150
Index 7 for Path 34/Row 29 on 10/23/00 = Scene_ID 7034029000029750
Index 8 for Path 35/Row 26 on 11/02/01 = Scene_ID 7035026000130650
Index 9 for Path 35/Row 27 on 10/01/01 = Scene_ID 7035027000127450
Index10 for Path 36/Row 26 on 09/17/99 = Scene_ID 7036026009926050
Index11 for Path 36/Row 27 on 09/30/01 = Scene_ID 5036027000127310
Index12 for Path 36/Row 28 on 09/22/01 = Scene_ID 7036028000126550
Landsat data and ancillary data used for the imperviousness prediction -
Data Type of DEM composed of 1 band and a Continuous Variable Type.
Data Type of Slope composed of 1 band and a Continuous Variable Type.
Data Type of Aspect composed of 1 band of Categorical Variable Type.
Data type of Position Index composed of 1 band of Continuous Variable Type.
Ancillary data used for urban area masking include:
1. NOAA Defense Meteorological Satellite Program 1 km city light data (1 band)
2. MRLC 1992 classification (1 band)
3. TIGER 2000 roads (1 band)