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 Earth Satellite Corporation 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 08 encompasses whole or portions of several states including Washington, Oregon, and Idaho. Questions about the NLCD mapping zone 08 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 08 are as follows:
SPRING-
Index 1 for Path 42/Row 28 on 04/25/01 = Scene_ID 7042028000111550
Index 2 for Path 43/Row 27 on 05/10/01 = Scene_ID 7043027000113050
Index 3 for Path 43/Row 28 on 04/03/02 = Scene_ID 7043028000209350
Index 4 for Path 44/Row 27 on 03/22/01 = Scene_ID 7044027000108150
Index 4 for Path 44/Row 28 on 03/22/01 = Scene_ID 7044028000108150
Index 5 for Path 44/Row 29 on 05/04/02 = Scene_ID 5044029000212410
Index 6 for Path 45/Row 26 on 03/21/01 = Scene_ID 5045026000108010
Index 7 for Path 45/Row 27 on 03/26/00 = Scene_ID 7045027000008650
Index 6 for Path 45/Row 28 on 03/21/01 = Scene_ID 5045028000108010
Index 6 for Path 45/Row 29 on 03/21/01 = Scene_ID 5045029000108010
LEAF ON (Summer)-
Index 1 for Path 42/Row 28 on 07/17/02 = Scene_ID 7042028000219850
Index 2 for Path 43/Row 27 on 07/24/02 = Scene_ID 7043027000220550
Index 2 for Path 43/Row 28 on 07/24/02 = Scene_ID 7043028000220550
Index 3 for Path 44/Row 27 on 07/15/02 = Scene_ID 7044027000219650
Index 8 for Path 44/Row 27 on 09/27/00 = Scene_ID 7044027000027150
Index 3 for Path 44/Row 28 on 07/15/02 = Scene_ID 7044028000219650
Index 9 for Path 44/Row 28 on 09/30/01 = Scene_ID 7044028000127350
Index 4 for Path 44/Row 29 on 07/09/00 = Scene_ID 7044029000019150
Index 5 for Path 45/Row 26 on 07/16/00 = Scene_ID 7045026000019850
Index 5 for Path 45/Row 27 on 07/16/00 = Scene_ID 7045027000019850
Index 6 for Path 45/Row 28 on 07/22/02 = Scene_ID 7045028000220350
Index 7 for Path 45/Row 29 on 07/17/03 = Scene_ID 5045029000319810
LEAF-OFF (Fall)-
Index 1 for Path 42/Row 28 on 09/11/99 = Scene_ID 7042028009925450
Index 2 for Path 43/Row 27 on 10/04/99 = Scene_ID 7043027009927750
Index 3 for Path 43/Row 28 on 10/06/00 = Scene_ID 7043028000028050
Index 4 for Path 44/Row 27 on 09/27/00 = Scene_ID 7044027000027150
Index 5 for Path 44/Row 28 on 09/30/01 = Scene_ID 7044028000127350
Index 5 for Path 44/Row 29 on 09/30/01 = Scene_ID 7044029000127350
Index 6 for Path 45/Row 26 on 10/18/99 = Scene_ID 7045026009929150
Index 7 for Path 45/Row 27 on 10/04/00 = Scene_ID 7045027000027850
Index 7 for Path 45/Row 28 on 10/04/00 = Scene_ID 7045028000027850
Index 7 for Path 45/Row 29 on 10/04/00 = Scene_ID 7045029000027850
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)