USGS NATIONAL LAND ARCHIVE PRODUCTION SYSTEM PRODUCT README: NDF FORMAT TABLE OF CONTENTS INTRODUCTION FORMAT ORGANIZATION * DATA FILE NAMES * README * READING DATA GENERAL INFORMATION and DOCUMENTATION ORDER SUPPORT DISCLAIMER INTRODUCTION This product was produced by the U.S. Geological Survey (USGS) and contains Landsat data files in standard National Land Archive Processing System Data Format (NDF) format. The Landsat 1, 2, and 3 satellites carried the multispectral scanner (MSS) sensors; the Landsat 4 and 5 satellites carries 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. Information on the Landsat 1 through 5 satellites is available at the Websites: http://edcwww.cr.usgs.gov/nsdi/html/landsat_mss/landsat_mss http://edcwww.cr.usgs.gov/nsdi/html/landsat_tm/landsat_tm Information about the Landsat-7 satellite, the ETM+ sensor, and Landsat-7 data collection, is available in the "Landsat 7 Science Data Users Handbook" at the Web site: http://edcwww.cr.usgs.gov/l7dhf/L7MMO/L7Documentation.html The NDF files are described in detail in the "National Land Archive Production System (NLAPS) Systematic Format Description Document" which may be found at the Website: http://edcwww.cr.usgs.gov/customer.html FORMAT The Landsat data are provided in NDF for radiometrically and geometrically corrected (level-1G) 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. For more information on the National Land Processing System, see the following Web site: NDF info at: http://edcwww.cr.usgs.gov/glis/hyper/guide/nlaps.html 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. In band sequential (BSQ) format, each band of a satellite image is separately stored in one image file (i.e., 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 and level-1G image files are in absolute radiance units scaled to 16 bits and 8 bits, respectively. 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 digital elevation model (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 parameters files: .HI, where 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+ Bands in Product Resolution(s) Product Files --------------------- ------------- ------------- 1-5, 7 30 Header Files: .H1 6, 9 60 .H2 8 15 .H3 Image Files: .I1 .I2 .I3 .I4 .I5 .I6 .I7 .I8 .I9 .WO .HI 1-5 30 Header Files: .H1 9 60 .H2 Image Files: .I1 .I2 .I3 .I4 .I5 .I9 .WO .HI 1 30 Header Files: .H1 8 15 .H2 Image Files: .I1 .I8 .WO .HI 1-5, 7 30 6, 9 30 8 30 Header Files: .H1 Image Files: .I1 .I2 .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.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 is a text file and is this document. * READING DATA * Delivered On Tape - Data on 8-mm, high-density (Exabyte) tapes are not tarred. * Delivered On CDROM: Data files are not packed. ISO 9660 Level 2. * 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. GENERAL INFORMATION and DOCUMENTATION For information about the Landsat 7 Data Set, including tutorials, product standards, and software, see: http://landsat7.usgs.gov/ No software is included on this product for viewing Landsat data. 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. The USGS EROS Data Center is available at: http://edcwww.cr.usgs.gov/eros-home.html and Customer Services is available at: http://edcwww.cr.usgs.gov/customer.html A list of ESIC offices is available at: http://mapping.usgs.gov/esic/esic.Index.html For information about other USGS products, see: http://mapping.usgs.gov/esic/to_order.html or call 1-888-ASK USGS. DISCLAIMER Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.