U.S. Geological Survey LEVEL-1 PRODUCT README: FAST-L7A FORMAT TABLE OF CONTENTS INTRODUCTION FORMAT ORGANIZATION * DATA FILE NAMES * README * READING DATA GENERAL INFORMATION and DOCUMENTATION ORDER SUPPORT DISCLAIMER INTRODUCTION This product was created by the U.S. Geological Survey (USGS) and contains Landsat-7 data files in FAST-L7A format. The Landsat-7 satellite carries the enhanced thematic mapper plus (ETM+) sensor and is part of an ongoing mission to provide quality remote sensing data in support of research and applications activities. Information on the Landsat-7 Program, including information about the Landsat-7 satellite, the ETM+ sensor, and Landsat-7 data collection, is available in the "Landsat-7 Level-0 and Level-1 Data Sets Document". The "National Land Archive Production System (NLAPS) Systematic Format Description Document" provides an overview of multiple product formats, including the FAST-L7A format. The FAST-L7A files are described in detail in the "Level 1 Product Output File, Data Format Control Book, L7-DFCB-04, Vol. 5, Book 2, Revision 5, April 2001". Other documents may be found on the Landsat-7 Documents Web page. Landsat-7 Level-0 and Level-1 Data Sets Document: http://eosims.cr.usgs.gov:5725/DATASET_DOCS/landsat7_dataset.html National Land Archive Production System (NLAPS) Systematic Format Description Document: http://edc.usgs.gov/products/satellite/NLAPSII.pdf Level 1 Product Output File, Data Format Control Book, L7-DFCB-04, Vol. 5, Book 2, Revision 5, April 2001: http://landsat7.usgs.gov/documents/dfcb/L1-409_DFCB_V5_B2_R5.pdf Landsat-7 Documents page: http://edcwww.cr.usgs.gov/l7dhf/L7MMO/document.htm FORMAT Landsat-7 data are provided in FAST-L7A format for radiometrically and geometrically corrected (level-1G) products. ORGANIZATION Landsat-7 data files are stored separately from the FAST-L7A directory file, which contains the file names and pointers for the data files. The level-1G image files are in absolute radiance units scaled to 8 bits. The FAST-L7A product consists of header files and linked image files: Header File Administrative Record: Contains information that identifies the product, the image, and the data specifically needed to ingest the imagery for each particular band. In order to import the image data, it is necessary to read the entries in the administrative record. Radiometric Record: Contains the coefficients needed to convert the image values into at-satellite spectral radiance for each particular band. Geometric Record: Contains geodetic location information. To align the imagery to other data sources, it is necessary to read the entries in the geometric record for each particular band. A separate header file exists for each of the following band groups: 1. Panchromatic 2. Visible Near Infrared/Shortwave Infrared (VNIR/SWIR) 3. Thermal Image File Each image file contains one ETM+ band of image pixels. There are no header records, prefix data, or suffix data in the image records. Image data are unblocked, and image files are 8-bit unsigned integers. * DATA FILE NAMES The file naming convention for FAST-L7A is as follows: L7fppprrr_rrrYYYYMMDD_AAA.FST where: L7 = Landsat-7 mission f = ETM+ data format (1 or 2) (data not pertaining to a specific format defaults to 1) ppp = starting path of the product rrr_rrr = starting and ending rows of the product YYYYMMDD = acquisition date of the image AAA = file type: B10 = band 1 B20 = band 2 B30 = band 3 B40 = band 4 B50 = band 5 B61 = band 6L (low gain) B62 = band 6H (high gain) B70 = band 7 B80 = band 8 HPN = panchromatic band header file HRF = VNIR/SWIR bands header file HTM = thermal bands header file MTL = Level-1 metadata FST = FAST-L7A file extension * README The README.FF7 is a text file and is this document. * READING DATA Delivered on tape: Data on 8-mm, high-density (Exabyte) tape and on digital linear tape (DLT) are tarred per Institute of Electrical and Electronics Engineers (IEEE) POSIX standard 1003.1, preserving file names. To read a tar tape on a computer with a UNIX operating system, type: tar -xvf / Command key arguments include: x = data are to be read from tape v = requests verbose output (that is, processed file names will be listed) f = archive name is specified The is system specific and may specify a device such as a tape drive or a file path. Specific parameters depend upon local server or workstation configurations. An example of extracting a specific directory from a tar-formatted tape: tar -xvf / 1 Other operating systems may require additional software for reading tar-formatted media. Delivered on compact disc (CD): Data files are not packed and conform to ISO 9660 Level-2 standards. Delivered via file transfer protocol (FTP): Data files are not packed or compressed. GENERAL INFORMATION and DOCUMENTATION For information about the Landsat-7 data set, including tutorials, product standards, and software, see: http://landsat7.usgs.gov/ http://edcdaac.usgs.gov/ No software is included on this product for viewing Landsat-7 data. FGDC metadata http://www.fgdc.gov/clearinghouse/clearinghouse.html ORDER SUPPORT Direct questions about orders to the USGS EROS Data Center's Customer Services at 1-800-252-4547 or contact an Earth Science Information Center (ESIC) office. USGS EROS Data Center: http://edc.usgs.gov/ Customer Services: http://edc.usgs.gov/about/customer/index.html ESIC Office Listing: http://mapping.usgs.gov/esic/esic_index.html For information about other USGS products, see: http://ask.usgs.gov/ or call 1-888-ASK-USGS (275-8747) DISCLAIMER Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Publication Date: April 29, 2002