USGS NATIONAL LAND ARCHIVE PRODUCTION SYSTEM PRODUCT README: NDF 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 standard National Land Archive Processing System (NLAPS) Data Format (NDF). 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 NDF for radiometrically and geometrically corrected (Level-1G systematically corrected) products. Data may be represented in both binary and American Standard Code for Information Interchange (ASCII) formats. Bit and byte ordering follow conventions set by the Institute of Electrical and Electronics Engineers (IEEE) with the term "byte" being synonymous with octet as used by the International Organization for Standardization. The NDF file format is described in the National Land Archive Production System (NLAPS) Systematic Format Description Document: http://landsat7.usgs.gov/documents/NLAPSII.pdf ORGANIZATION The product composition for geometrically and radiometrically corrected Landsat data includes a header file, image files, a work order report file, and a history and processing parameters file. The data is provided in band sequential (BSQ) format (i.e., each band is stored in a separate image file, and scan lines are sequentially written to the same image file). Geometrically corrected products which have had terrain correction applied, may also contain a digital elevation model (DEM) header file and a DEM File containing the terrain model used to correct the product. The Landsat data files are stored separately from the NDF directory file, which contains the file names and pointers for the data files. The level-1R files are in absolute radiance units scaled to 16 bits. The level-1G image files are in 8-bit (unsigned integer) digital numbers (DN). NDF Product Composition: NDF products are written to disk by NLAPS and conform to the naming standards defined below. Products are formatted as though they are being written to a single physical volume. Up to six file types are included with each NDF product. One or more image header files describe the product delivered and provide necessary information for further processing. One or more image files contain the binary image data. If a DEM is used for terrain correction, a DEM header and DEM image file may be included as well. Also, each NDF product includes a work order report file and a history file indicating processing parameters. Image and DEM Header File Format: The image and DEM header files contain information describing the image data in the image or DEM files. The format is similar to the EOSAT Fast Format header file ("Earth Observation Satellite Company (EOSAT) Fast Format Document for Digital Products - Version C, Effective April 23, 1996 [Revised July 29, 1996]" ) but is more general in that support for additional sensors, DEM data, and non-satellite imagery are included. The header file is intended to be easy to read and uses only ASCII-text to represent information (i.e., there is no binary information in the header). In order to accommodate multi-resolution products, one header file is written for each resolution in the output product. This is in contrast to previous versions of the NDF format in which all data files in the same volume (data set) were required to have the same pixel spacing and pixel format, with different resolutions requiring a separate volume set. Image and DEM Files: The image and DEM files contain the raw image pixels or elevation samples. There are no header records within the file, nor are there any prefix and/or suffix data to the individual image records. If the image file is part of a BSQ product, then it contains information for only one band, and the image lines for that band are stored sequentially. * DATA FILE NAMES NDF file name formats defines the naming convention for the file types that may be produced with an NDF-format product. _____________________________________________________________ |File type | Format | |__________________________|__________________________________| | | | |Header files for imagery | .H
, | | | where reflects the | | | acquisition footprint and | | |
is 1 for | | | single-resolution footprint and | | | increments from 1 for each | | | header file in a multi- | | | resolution footprint. | |__________________________|__________________________________| | | | |Image files | .I, where | | | is as above and | | | is an integer ranging | | | from 1 to the number of bands | | | in the product for BSQ. | |__________________________|__________________________________| | | | |Work order report files | .WO, where | | | is as above and a WO suffix is | | | appended. | |__________________________|__________________________________| | | | |History and processing | .HI, where | |parameters files | is as above and a HI suffix | | | references the history and | | | processing parameters used to | | | process this product. | |__________________________|__________________________________| | | | |Header files for DEM data | .DH, where | | | is as above and a DH suffix | | | references the DEM header | | | (optional) | |__________________________|__________________________________| | | | |DEM data files | .DD, where | | | is as above and DD suffix | | | references the DEM data | | | (optional). | |__________________________|__________________________________| Sample Product Band and File Combinations - ETM+ _______________________________________________________________ | ETM+ |Resolution(s)| File |Header Files |Image Files | | Bands | |Organization| | | | in | | | | | |Product| | | | | |_______|_____________|____________|____________ |_____________| |1-5, 7 |30 |BSQ |.H1 |.I1 | |6, 9 |60 | |.H2 |.I2 | |8 |15 | |.H3 |.I3 | | | | | |.I4 | | | | | |.I5 | | | | | |.I6 | | | | | |.I7 | | | | | |.I8 | | | | | |.I9 | | | | | |.WO | | | | | |.HI | |_______|_____________|____________|___________ _|_____________| |1-5 |30 |BSQ |.H1 |.I1 | |9 |60 | |.H2 |.I2 | | | | | |.I3 | | | | | |.I4 | | | | | |.I5 | | | | | |.I9 | | | | | |.WO | | | | | |.HI | |_______|_____________|____________|_____________|_____________| |1 |30 |BSQ |.H1 |.I1 | |8 |15 | |.H2 |.I8 | | | | | |.WO | | | | | |.HI | |_______|_____________|____________|_____________|_____________| |1-5, 7 |30 |BSQ |.H1 |.I1 | |6, 9 |30 | | |.I2 | |8 |30 | | |.I3 | | | | | |.I4 | | | | | |.I5 | | | | | |.I6 | | | | | |.I7 | | | | | |.I8 | | | | | |.I9 | | | | | |.WO | | | | | |.HI | |_______|_____________|____________|_____________|_____________| The sequence of the image data files that are produced with an NDF-format product are as follows: (ETM+ sample) LE7018033009924650.H1 -- Product header #1 LE7018033009924650.H2 -- Product header #2 LE7018033009924650.H3 -- Product header #3 LE7018033009924650.I1 -- ETM+ band 1 LE7018033009924650.I2 -- ETM+ band 2 LE7018033009924650.I3 -- ETM+ band 3 LE7018033009924650.I4 -- ETM+ band 4 LE7018033009924650.I5 -- ETM+ band 5 LE7018033009924650.I6 -- ETM+ band 6, low LE7018033009924650.I7 -- ETM+ band 7 LE7018033009924650.I8 -- ETM+ band 8 LE7018033009924650.I9 -- ETM+ band 6, high LE7018033009924650.MTL - Level-1 metadata LE7018033009924650.WO -- Job report file LE7018033009924650.HI -- Job history file LE7018033009924650.DH -- DEM header (optional) LE7018033009924650.DD -- DEM data (optional) (TM sample) LT5018033009924650.H1 -- Product header #1 LT5018033009924650.I1 -- TM band 1 LT5018033009924650.I2 -- TM band 2 LT5018033009924650.I3 -- TM band 3 LT5018033009924650.I4 -- TM band 4 LT5018033009924650.I5 -- TM band 5 LT5018033009924650.I6 -- TM band 6 LT5018033009924650.I7 -- TM band 7 LT5018033009924650.WO -- Job report file LT5018033009924650.HI -- Job history file LT5018033009924650.DH -- DEM header (optional) LT5018033009924650.DD -- DEM data (optional) (MSS sample) LM5018033009924650.H1 -- Product header #1 LM5018033009924650.I1 -- MSS band 1 LM5018033009924650.I2 -- MSS band 2 LM5018033009924650.I3 -- MSS band 3 LM5018033009924650.I4 -- MSS band 4 LM5018033009924650.I5 -- MSS band 5 (Landsat 3 only) LM5018033009924650.WO -- Job report file LM5018033009924650.HI -- Job history file LM5018033009924650.DH -- DEM header (optional) LM5018033009924650.DD -- DEM data (optional) * README The README.TXT (this document) is an ASCII text file. * READING DATA Delivered on tape: Data on 8-mm, high-density (Exabyte) tapes are not tarred. 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. Delivered on digital linear tape (DLT): Data files are not packed or compressed. Surcharge required. 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