EROS DATA CENTER LEVEL-1 PRODUCT GENERATION SYSTEM PRODUCT README: GEOTIFF FORMAT TABLE OF CONTENTS BACKGROUND FORMAT ORGANIZATION NAMING CONVENTION READING DATA o DELIVERED ON TAPE o DELIVERED ON CD-ROM o DELIVERED VIA FILE TRANSFER PROTOCOL EDC CONTACT REFERENCES APPENDIX o ACRONYM LIST BACKGROUND The launch of the Landsat-7 satellite on April 15, 1999, marks the addition of the latest satellite to the National Aeronautics and Space Administration's Landsat satellite series. 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 Science Data Users Handbook." The Geographic Tagged Image File Format (GeoTIFF) files are described in detail in the "Earth Science Data and Information System (ESDIS) Level 1 Product Output Files Data Format Control Book, Volume 5, Book 2." See References. FORMAT Radiometrically and geometrically corrected Landsat-7 data (level-1G products) are provided in the GeoTIFF format. This format defines a set of public domain TIFF tags that describe the cartographic and geodetic information that is associated with an image. The initial tags are followed by image data, that in turn, may be interrupted by more descriptive tags. By using the GeoTIFF format, both metadata and image data can be encoded into the same file. ORGANIZATION Each band of Landsat-7 data in the GeoTIFF format is delivered as a grayscale, uncompressed, 8-bit string of unsigned integers. No other files accompany the product. NAMING CONVENTION The file naming convention for GeoTIFF is as follows: L7fppprrr_rrrYYYYMMDD_AAA.TIF where L7 indicates the Landsat-7 mission. f indicates the ETM+ data format. ppp indicates the starting path of the product. rrr_rrr indicates the starting and ending rows of the product. YYYYMMDD indicates the acquisition date of an image. AAA indicates the 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 TIF indicates the GeoTIFF file extension. READING DATA o Delivered On Tape Data on 8-mm, high-density (Exabyte) tapes are tarred per Institute of Electrical and Electronics Engineers 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 indicates that the data are to be read from tape. v requests verbose output (that is, processed file names will be listed). f indicates that the archive name is specified. The device name is system specific and may specify a device such as a tape drive or a file path. Specific parameters depend upon local workstation configurations. o Delivered On CD-ROM Data files are not packed. ISO 9660 Level 2. o Delivered Via File Transfer Protocol Data files are not packed or compressed. EDC CONTACT EDC User Services U.S. Geological Survey EROS Data Center 47914 252nd Street Sioux Falls, SD 57198-0001 USA Voice: 605-594-6116 Fax: 605-594-6963 E-Mail: edc@eos.nasa.gov REFERENCES Irish, Richard, 1998, Landsat 7 science data users handbook: Greenbelt, Maryland, Goddard Space Flight Center, electronic version, http://ltpwww.gsfc.nasa.gov/IAS/handbook/handbook_toc.html National Aeronautics and Space Administration, 1998, Earth Science Data and Information System (ESDIS) level 1 product output files data format control book, volume 5, book 2, revision 3: Greenbelt, Maryland, Goddard Space Flight Center, electronic version, http://lpgs-server.gsfc.nasa.gov/!LPGS_Baseline/LPGS_DFCB_Rev3(5.99).pdf [Updated May 1999, 510-3DFC/0197, CSC 10036361] Data Format Control Books may be revised periodically. Visit the following document server: Earth Science Data and Information System (ESDIS) Level 1 Product Generation System (LPGS) Document Server at: http://lpgs-server.gsfc.nasa.gov/!LPGS_Baseline/baseline.html Disclaimer: Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. APPENDIX o ACRONYM LIST EDC -- EROS Data Center EROS -- Earth Resources Observation Systems ESDIS -- Earth Science Data and Information System ETM+ -- Enhanced Thematic Mapper Plus GeoTIFF -- Geographic Tagged Image File Format LPGS -- Level-1 Product Generation System