U.S. Geological Survey LEVEL-1 PRODUCT README: GeoTIFF 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 data files in Geographic Tagged Image-File Format (GeoTIFF). The Landsat 1, 2, and 3 satellites carried the Multispectral Scanner (MSS) sensor; the Landsat 4 and 5 satellites carry both the MSS and the Thematic Mapper (TM) sensors; and the Landsat 7 satellite carries the Enhanced Thematic Mapper Plus (ETM+) sensor. All three sensors are a part of an ongoing mission to provide quality remote sensing data in support of research and applications activities. For information on MSS products (Landsats 1-5): http://edc.usgs.gov/products/satellite/mss.html For information on TM products (Landsats 4-5): http://edc.usgs.gov/products/satellite/tm.html For information on ETM+ products (Landsat 7): http://edc.usgs.gov/products/satellite/landsat7.html For information on the Landsat Project, missions, and data acquisitions: http://landsat7.usgs.gov For detailed information on the Landsat 7 satellite, the ETM+ sensor, and Landsat 7 data products, see the Landsat 7 Science Data Users Handbook: http://ltpwww.gsfc.nasa.gov/IAS/handbook/handbook_toc.html FORMAT Landsat data are provided in GeoTIFF for radiometrically and geometrically corrected (level-1G) products and for Landsat 7 ETM+ level-1G SLC-off gap-filled products. GeoTIFF defines a set of publicly available TIFF tags that describe cartographic and geodetic information associated with TIFF images. GeoTIFF is a format that enables referencing a raster image to a known geodetic model or map projection. 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. The Landsat-7 GeoTIFF file format is described in detail in the "Level 1 Product Output File, Data Format Control Book, L7-DFCB-04, Vol. 5, Book 2, Revision 6, April 2004": http://landsat7.usgs.gov/documents/L7-DFCB-04-L1p-DFCB.pdf For more information on GeoTIFF visit: http://www.remotesensing.org/geotiff/geotiff.html ORGANIZATION Each band of Landsat data in the GeoTIFF format is delivered as a grayscale, uncompressed, 8-bit string of unsigned integers. A metadata (MTL) file is included with Landsat 7 ETM+ orders. A processing history (WO) file is included with Landsat 4-5 TM orders. Landsat 7 ETM+ SLC-off gap-filled products will include an additional directory (GAP_MASK) that contains a set of flat binary scan gap mask files (one per band). * DATA FILE NAMES The file naming convention for Landsat 7 GeoTIFF is as follows: L7fppprrr_rrrYYYYMMDD_AAA.TIF where: L7 = Landsat-7 mission f = ETM+ data format (1 or 2) 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 MTL = Level-1 metadata TIF = GeoTIFF file extension The file naming convention for other Landsat GeoTIFF is as follows: LTNppprrrOOYYDOY10_AA.TIF where: LT = Landsat Thematic Mapper N = satellite number. This should be validated against the satellite field if used exclusively ppp = starting path of the product rrr = starting row of the product OO = WRS row offset (set to 00) YY = last two digits of the year of acquisition DOY = Julian date of acquisition 1 = instrument mode 0 = instrument multiplexor (MUX) AA = file type: B1 = band 1 B2 = band 2 B3 = band 3 B4 = band 4 B5 = band 5 B6 = band 6 B7 = band 7 TIF = GeoTIFF file extension * GAP MASKS Level-1G SLC-off gap-filled products include a scan gap mask for each band, located in a separate directory. Gap mask files are provided in compressed (GZIP) GeoTIFF format. The file name convention for gap mask files is identical to that described above for GeoTIFF format, with the exception of the file extension (.TIF.GZ). * README The README.GTF (this document) is an ASCII text file. * 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. No software is included on this product for viewing Landsat data. GENERAL INFORMATION and DOCUMENTATION Landsat 7 (ETM+): http://landsat7.usgs.gov/ http://edc.usgs.gov/products/satellite/landsat7.html Landsat 4-5 (TM): http://edc.usgs.gov/products/satellite/tm.html Landsat 1-5 (MSS): http://edc.usgs.gov/products/satellite/mss.html FGDC metadata: http://www.fgdc.gov/clearinghouse/clearinghouse.html Data restrictions and citation: http://edc.usgs.gov/about/customer/citation.html PRODUCT SUPPORT For further information on this product, contact USGS EROS Data Center Customer Services: Customer Services U.S. Geological Survey EROS Data Center 47914 252nd Street Sioux Falls, SD 57198-0001 Tel: 800-252-4547 Tel: 605-594-6151 TDD: 605-594-6933 Fax: 605-594-6589 Email: custserv@usgs.gov web: http://edc.usgs.gov/about/customer/index.html For information on other products from USGS EROS Data Center: http://edc.usgs.gov/ For information on other USGS products: 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: March 5, 2004