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 Sanborn Map Company 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 34 encompasses whole or portions of several states including Texas, New Mexico, Oklahoma,and Kansas. Questions about the NLCD mapping zone 34 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 34 are as follows:
SPRING-
Index 1 for Path 29/Row 35 on 02/28/02 = Scene_ID 7029035000205950
Index 2 for Path 29/Row 36 on 04/01/02 = Scene_ID 7029036000209150
Index 2 for Path 29/Row 37 on 04/01/02 = Scene_ID 7029037000209150
Index 3 for Path 29/Row 38 on 02/12/02 = Scene_ID 7029038000204350
Index 4 for Path 30/Row 34 on 05/04/00 = Scene_ID 7030034000012550
Index 5 for Path 30/Row 35 on 04/24/02 = Scene_ID 7030035000211450
Index 6 for Path 30/Row 36 on 03/07/02 = Scene_ID 7030036000206650
Index 7 for Path 30/Row 37 on 02/19/02 = Scene_ID 7030037000205050
Index 8 for Path 30/Row 38 on 04/08/02 = Scene_ID 7030038000209850
Index 9 for Path 31/Row 34 on 05/11/00 = Scene_ID 7031034000013250
Index10 for Path 31/Row 35 on 02/26/02 = Scene_ID 7031035000205750
Index10 for Path 31/Row 36 on 02/26/02 = Scene_ID 7031036000205750
Index11 for Path 31/Row 37 on 02/21/00 = Scene_ID 7031037000005250
Index12 for Path 32/Row 36 on 04/16/00 = Scene_ID 7032036000010750
LEAF ON (Summer)-
Index 1 for Path 29/Row 35 on 05/19/02 = Scene_ID 7029035000213950
Index11 for Path 29/Row 35 on 10/23/01 = Scene_ID 7029035000129650
Index 2 for Path 29/Row 36 on 05/29/00 = Scene_ID 7029036000015050
Index 2 for Path 29/Row 37 on 05/29/00 = Scene_ID 7029037000015050
Index 3 for Path 29/Row 38 on 05/13/00 = Scene_ID 7029038000013450
Index 4 for Path 30/Row 34 on 05/29/03 = Scene_ID 7030034000314950
Index 5 for Path 30/Row 35 on 06/19/02 = Scene_ID 5030035000217010
Index 6 for Path 30/Row 36 on 05/23/01 = Scene_ID 7030036000114350
Index 6 for Path 30/Row 37 on 05/23/01 = Scene_ID 7030037000114350
Index 6 for Path 30/Row 38 on 05/23/01 = Scene_ID 7030038000114350
Index 7 for Path 31/Row 34 on 06/15/01 = Scene_ID 7031034000116650
Index10 for Path 31/Row 35 on 09/16/00 = Scene_ID 7031035000026050
Index 8 for Path 31/Row 35 on 05/27/00 = Scene_ID 7031035000014850
Index 8 for Path 31/Row 36 on 05/27/00 = Scene_ID 7031036000014850
Index 8 for Path 31/Row 37 on 05/27/00 = Scene_ID 7031037000014850
Index 9 for Path 32/Row 36 on 05/08/02 = Scene_ID 7032036000212850
LEAF-OFF (Fall)-
Index 1 for Path 29/Row 35 on 10/23/01 = Scene_ID 7029035000129650
Index 2 for Path 29/Row 36 on 10/07/01 = Scene_ID 7029036000128050
Index 1 for Path 29/Row 37 on 10/23/01 = Scene_ID 7029037000129650
Index 2 for Path 29/Row 38 on 10/07/01 = Scene_ID 7029038000128050
Index 3 for Path 30/Row 34 on 09/25/00 = Scene_ID 7030034000026950
Index 4 for Path 30/Row 35 on 10/14/01 = Scene_ID 7030035000128750
Index 4 for Path 30/Row 36 on 10/14/01 = Scene_ID 7030036000128750
Index 5 for Path 30/Row 37 on 09/28/01 = Scene_ID 7030037000127150
Index 4 for Path 30/Row 38 on 10/14/01 = Scene_ID 7030038000128750
Index 6 for Path 31/Row 34 on 10/18/00 = Scene_ID 7031034000029250
Index 7 for Path 31/Row 35 on 11/01/99 = Scene_ID 7031035009930550
Index 7 for Path 31/Row 36 on 11/01/99 = Scene_ID 7031036009930550
Index 7 for Path 31/Row 37 on 11/01/99 = Scene_ID 7031037009930550
Index 7 for Path 31/Row 38 on 11/01/99 = Scene_ID 7031038009930550
Index 8 for Path 32/Row 36 on 10/23/99 = Scene_ID 7032036009929650
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)