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 13 encompasses whole or portions of several states including California, Nevada, and Arizona. Questions about the NLCD mapping zone 13 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 13 are as follows:
SPRING-
Index 1 for Path 38/Row 34 on 04/26/00 = Scene_ID 7038034000011750
Index 2 for Path 38/Row 36 on 04/10/00 = Scene_ID 7038036000010150
Index 3 for Path 38/Row 37 on 03/25/00 = Scene_ID 7038037000008550
Index 4 for Path 39/Row 34 on 05/03/00 = Scene_ID 7039034000012450
Index 5 for Path 39/Row 35 on 04/01/00 = Scene_ID 7039035000009250
Index 5 for Path 39/Row 36 on 04/01/00 = Scene_ID 7039036000009250
Index 6 for Path 39/Row 37 on 03/22/02 = Scene_ID 7039037000208150
Index 7 for Path 40/Row 34 on 04/08/00 = Scene_ID 7040034000009950
Index 7 for Path 40/Row 35 on 04/08/00 = Scene_ID 7040035000009950
Index 8 for Path 40/Row 36 on 04/09/03 = Scene_ID 5040036000309910
Index 9 for Path 40/Row 37 on 02/25/02 = Scene_ID 7040037000205650
Index 7 for Path 41/Row 34 on 04/08/03 = Scene_ID 7041034000309850
Index 7 for Path 41/Row 35 on 04/08/03 = Scene_ID 7041035000309850
Index10 for Path 41/Row 36 on 03/04/02 = Scene_ID 7041036000206350
LEAF ON (Summer)-
Index 1 for Path 38/Row 34 on 05/31/01 = Scene_ID 7038034000115150
Index 2 for Path 38/Row 36 on 06/13/00 = Scene_ID 7038036000016550
Index 2 for Path 38/Row 37 on 06/13/00 = Scene_ID 7038037000016550
Index 3 for Path 39/Row 34 on 07/06/00 = Scene_ID 7039034000018850
Index 3 for Path 39/Row 35 on 07/06/00 = Scene_ID 7039035000018850
Index 3 for Path 39/Row 36 on 07/06/00 = Scene_ID 7039036000018850
Index 4 for Path 39/Row 37 on 06/07/01 = Scene_ID 7039037000115850
Index 5 for Path 40/Row 34 on 06/11/00 = Scene_ID 7040034000016350
Index 5 for Path 40/Row 35 on 06/11/00 = Scene_ID 7040035000016350
Index 6 for Path 40/Row 36 on 06/17/02 = Scene_ID 7040036000216850
Index 7 for Path 40/Row 37 on 06/14/01 = Scene_ID 7040037000116550
Index 8 for Path 41/Row 34 on 07/20/00 = Scene_ID 7041034000020250
Index 9 for Path 41/Row 35 on 07/26/02 = Scene_ID 7041035000220750
Index10 for Path 41/Row 36 on 06/08/02 = Scene_ID 7041036000215950
LEAF-OFF (Fall)-
Index 1 for Path 38/Row 34 on 11/02/99 = Scene_ID 7038034009930650
Index 2 for Path 38/Row 36 on 10/17/99 = Scene_ID 7038036009929050
Index 3 for Path 38/Row 37 on 10/01/99 = Scene_ID 7038037009927450
Index 4 for Path 39/Row 34 on 10/08/99 = Scene_ID 7039034009928150
Index 5 for Path 39/Row 35 on 10/24/99 = Scene_ID 7039035009929750
Index 5 for Path 39/Row 36 on 10/24/99 = Scene_ID 7039036009929750
Index 6 for Path 39/Row 37 on 10/27/03 = Scene_ID 5039037000330010
Index 7 for Path 39/Row 37 on 11/14/01 = Scene_ID 7039037000131850
Index 8 for Path 40/Row 34 on 10/15/99 = Scene_ID 7040034009928850
Index 9 for Path 40/Row 35 on 09/29/99 = Scene_ID 7040035009927250
Index10 for Path 40/Row 36 on 10/07/02 = Scene_ID 7040036000228050
Index11 for Path 40/Row 37 on 10/04/01 = Scene_ID 7040037000127750
Index12 for Path 41/Row 34 on 10/08/00 = Scene_ID 7041034000028250
Index13 for Path 41/Row 35 on 09/20/99 = Scene_ID 7041035009926350
Index14 for Path 41/Row 36 on 09/06/00 = Scene_ID 7041036000025050
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)