The ASTER On-Demand L2 Decorrelation Stretch (SWIR) is an on-demand product with user-specified processing options. Users need to pick three from the available six SWIR spectral bands as input. This product is a color-enhanced image of the SWIR radiance data, produced from a Level-1B data set. Decorrelation stretch is a process used to enhance the color differences in an image by removing the inter-band correlation in the radiance values of the input SWIR pixels. Such an image provides a general overview that emphasizes reflectance and emissivity variations, and restrains variations owing to topography and temperature. The general purpose of a decorrelation stretched image is to serve as a data visualization tool while reviewing and selecting ASTER image data for further analysis and research. It attempts to address three broad requirements of such a visualization tool:
The decorrelation stretch product algorithm calculates the principal components of a three-band SWIR image. Each component is rescaled or contrast-stretched by normalizing the variances of the vectors, and rotated back into the RGB color space.
Area | ~60 km x 60 km |
Image Dimensions | 2100 rows x 2490 columns |
File Size | ~22 MB |
Spatial Resolution | 30 m |
Units | Centigrade (°C) |
Projection | Universal Transverse Mercator (UTM) |
Data Format | HDF-EOS or GeoTIFF |
Vgroup Data Fields | 3 |
Vgroup Data Fields/ |
Units |
Data Type |
Valid Range |
Band Scale Factor |
---|---|---|---|---|
SWIR (30 Meters) | ||||
Band 4 (1.600–1.700) | None | 8-bit unsigned integer | 0–255 | 1.0 |
Band 5 (2.145–2.185) | None | 8-bit unsigned integer | 0–255 | 1.0 |
Band 6 (2.185–2.225) | None | 8-bit unsigned integer | 0–255 | 1.0 |
Band 7 (2.235–2.285) | None | 8-bit unsigned integer | 0–255 | 1.0 |
Band 8 (2.295–2.365) | None | 8-bit unsigned integer | 0–255 | 1.0 |
Band 9 (2.360–2.430) | None | 8-bit unsigned integer | 0–255 | 1.0 |
LP DAAC Acknowledgement and Citations Policy
In the event that data distributed from the Land Processes DAAC are incorporated into your research, please supply the following acknowledgment within your published work: "These data are distributed by the Land Processes Distributed Active Archive Center (LP DAAC), located at the U.S. Geological Survey (USGS) Earth Resources Observation and Science (EROS) Center (lpdaac.usgs.gov)." If possible, please e-mail or send us reprints/citations of papers or oral presentations based on data obtained from the LP DAAC (see below for mailing address and e-mail address). This will help us to stay informed of how the data are being utilized.
LP DAAC User Services
U.S. Geological Survey (USGS)
Earth Resources Observation and Science (EROS) Center
47914 252nd Street
Sioux Falls, SD 57198-0001
Please find a link to (and information about) these data access tools on the Get Data Section of this Web Site.
U.S. Geological Survey (USGS)
Center for Earth Resources Observation and Science (EROS)
47914 252nd Street
Sioux Falls, SD 57198-0001
Phone Number: | 605-594-6116 |
Toll Free: | 866-573-3222 |
866-LPE-DAAC | |
Fax: | 605-594-6963 |
Email: | lpdaac@eos.nasa.gov |
Web: | http://lpdaac.usgs.gov |