SNF Satellite Image Data Inventory: Data Set Guide Document Summary: The purpose of the SNF Study was to develop the techniques to make the link from biophysical measurements made on the ground to aircraft radiometric measurements and then to scale up to satellite observations. Therefore, satellite image data were acquired for the Superior National Forest study site. These data were selected from all the scenes available from Landsat 1 through 5 and SPOT platforms. Image data substantially contaminated by cloud cover or of poor radiometric quality was not acquired. Of the Landsat scenes, only one Thematic Mapper (TM) scene was acquired, the remainder were Multispectral Scanner (MSS) images. Some of the acquired image data had cloud cover in portions of the scene or other problems with the data. These problems and other comments about the images are summarized in the data set. This data set contains a listing of the scenes that passed inspection and were acquired and archived by Goddard Space Flight Center. Though these image data are no longer available from either the Goddard Space Flight Center or the ORNL DAAC, this data set has been included in the Superior National Forest data collection in order to document which satellite images were used during the project. Table of Contents: 1. Data Set Overview 2. Investigator(s) 3. Theory of Measurements 4. Equipment 5. Data Acquisition Methods 6. Observations 7. Data Description 8. Data Organization 9. Data Manipulations 10. Errors 11. Notes 12. Application of the Data Set 13. Future Modifications and Plans 14. Software 15. Data Access 16. Output Products and Availability 17. References 18. Glossary of Terms 19. List of Acronyms 20. Document Information 1. Data Set Overview: Data Set Identification: SNF Satellite Image Data Inventory. Data Set Introduction: The purpose of the SNF Study was to develop the techniques to make the link from biophysical measurements made on the ground to aircraft radiometric measurements and then to scale up to satellite observations. Therefore, satellite image data were acquired for the Superior National Forest study site. These data were selected from all the scenes available from Landsat 1 through 5 and SPOT platforms. Image data substantially contaminated by cloud cover or of poor radiometric quality was not acquired. Of the Landsat scenes, only one Thematic Mapper (TM) scene was acquired, the remainder were Multispectral Scanner (MSS) images. Some of the acquired image data had cloud cover in portions of the scene or other problems with the data. These problems and other comments about the images are summarized in the data set. This data set contains a listing of the scenes that passed inspection and were acquired and archived by Goddard Space Flight Center. Though these image data are no longer available from either the Goddard Space Flight Center or the ORNL DAAC, this data set has been included in the Superior National Forest data collection in order to document which satellite images were used during the project. Objective/Purpose: The purpose of the SNF Study was to develop the techniques to make the link from biophysical measurements made on the ground to aircraft radiometric measurements and then to scale up to satellite observations. Summary of Parameters: This data set contains a listing of the scenes that passed inspection and were acquired and archived by Goddard Space Flight Center. These problems and other comments about the images are summarized in the data set. Discussion: Not available. Related Data Sets: Not available. 2. Investigator(s): Investigator(s) Name and Title: Dr. Forrest G. Hall NASA Goddard Space Flight Center Dr. K. Fred Huemmrich NASA Goddard Space Flight Center Dr. Donald E. Strebel Versar, Inc. Dr. Scott J. Goetz University of Maryland Ms. Jamie E. Nickeson NASA Goddard Space Flight Center Ms. K.D. Woods NASA Goddard Space Flight Center Dr. Celeste Jarvis NASA Headquarters Title of Investigation: Biophysical, Morphological, Canopy Optical Property, and Productivity Data on the Superior National Forest. Contact Information: Dr. Forrest G. Hall NASA Goddard Space Flight Center Code 923 Greenbelt, Maryland 20771 USA Fax +1 (301) 286-0239 Telephone +1 (301) 286-2974 Email: fghall@ltpmail.gsfc.nasa.gov 3. Theory of Measurements: Not available. 4. Equipment: Sensor/Instrument Description: Collection Environment: Satellite. Source/Platform: * LANDSAT-1 * LANDSAT-2 * LANDSAT-3 * LANDSAT-4 * LANDSAT-5 * SPOT-1 Source/Platform Mission Objectives: Not available. Key Variables: Observation date (obs_datc), platform and sensor. Principles of Operation: Not available. Sensor/Instrument Measurement Geometry: Not available. Manufacturer of Sensor/Instrument: Not available. Calibration: Not available. 5. Data Acquisition Methods: Not available. 6. Observations: Data/Field Notes: Not available. 7. Data Description: Spatial Characteristics: The study area covered a 50 x 50 km area centered at approximately 48 degrees North latitude and 92 degrees West longitude in northeastern Minnesota at the southern edge of the North American boreal forest. Temporal Characteristics: This data set contains an inventory of data collected from July 1973 to August 1990. Data Characteristics: __________________________________________________________________________ Variable Name/ Long Name SAS Type Generic Type Description __________________________________________________________________________ 1 obs_datc OBS_DATE $ 12 DATE "Observation date (dd-mmm-yy)" __________________________________________________________________________ 2 sze SOLAR_ZEN 8 NUMBER(3,1) "Average solar zenith angle in decimal degrees" __________________________________________________________________________ 3 saz SOLAR_AZM 8 NUMBER(4,1) "Average solar azimuth angle in decimal degrees from north" __________________________________________________________________________ 4 vze VIEW_ZEN 8 NUMBER(3,1) "Average view zenith angle from the platform in decimal degrees" __________________________________________________________________________ 5 vaz VIEW_AZM 8 NUMBER(4,1) "Average view azimuth from the platform in decimal degrees from north" __________________________________________________________________________ 6 tape_id TAPE_ID $ 12 CHAR(12) "Tape ID" __________________________________________________________________________ 7 comment COMMENTS $ 70 CHAR(70) "Satellite image data comment regarding any known problems with the data, the level to which it has been processed, cloud cover, data quality, and any other appropriate remarks" __________________________________________________________________________ 8 platform PLATFORM $ 24 CHAR(8) "The name of the platform on which the instrument was mounted" __________________________________________________________________________ 9 sensor INSTRUMENT $ 24 CHAR(12) "Sensor/instrument that collected the data" __________________________________________________________________________ 10 n_pix PIXELS 8 NUMBER(5,0) "Number of pixels (samples) across any given record" __________________________________________________________________________ 11 n_recs NUM_RECORDS 8 NUMBER(5,0) "Number of records (lines) in the scene" _________________________________________________________________ Sample Data Record: obs_datc sze saz vze vaz tape_id comment platform sensor n_pix n_recs __________________________________________________________________________ "01-AUG-76" 39 130 0 0 "2983M760801" "Band 1 and 2 data "Landsat-2" "MSS" 3264 2983 striped, cum ulus in southern par t of SNF" "01-MAY-83" 38 141 0 0 "2983M830501" " " "Landsat-4" "MSS" 3264 2983 "03-JUL-73" 32 132 0 0 "2983M730703" "Band 1 and 2 data "Landsat-1" "MSS" 3264 2983 striped, sca ttered cumulus in S NF" "04-OCT-87" 53 167 3.3 102.7 "3000S871004" "Some cirrus cloud cover "SPOT" "HRV2" 3000 3000 in Eastern S NF" "05-JUL-76" 40 117 0 0 "2983M760705" "Band 1 and 2 striped, "Landsat-1" "MSS" 3264 2983 few cumulus, southern portion of s cene cut off" "05-JUN-82" 34 133 0 0 "2983M820605" "Line start e rror N and "Landsat-3" "MSS" 3264 2983 W of Ely, SN F cut off East of Big Moose Lake" "05-MAY-87" 33 168 27.6 106.8 "3000S870505" "Cirrus cloud cover in "SPOT" "HRV2" 3000 3000 Western port ion of SNF" "06-SEP-76" 49 139 0 0 "2983M760906" "Band 1 and 2 data "Landsat-2" "MSS" 3264 2983 striped, SNF clear of cloud cover" "08-AUG-87" 40 134 0 0 "2983M870808" "SNF clear of cloud "Landsat-5" "MSS" 3264 2983 cover" "11-JUN-79" 35 127 0 0 "2983M790611" "Band 1 and 2 data "Landsat-2" "MSS" 3264 2983 striped, sou thern half of SNF cut o ff" "13-AUG-87" 35 155 3.6 102.6 "3000S870813" "Few scattere d cumulus" "SPOT" "HRV1" 3000 3000 striped, sou thern half of SNF cut o ff" "14-SEP-87" 46 157 24.1 100 "3000S870914" "SNF clear of cloud "SPOT" "HRV1" 3000 3000 cover" "16-AUG-90" 42 134 0 0 "2983M900816" "Band 1 and 2 data "Landsat-5" "MSS" 3264 2983 striped, som e cirrus cloud cover in SNF" "18-JUN-83" 32 133 0 0 "2983M830618" "SNF clear of cloud "Landsat-4" "MSS" 3264 2983 cover, image used as reference fo r GSFC work" "21-AUG-86" . . . . " " " " "Landsat-5" "MSS" 3264 2983 "21-JUN-77" 36 122 0 0 "2983M770621" "Band 1 and 2 striped, "Landsat-2" "MSS" 3264 2983 SNF clear, S NF cut off East of Big Lake" "21-MAY-76" 36 131 0 0 "2983M760521" "Band 1 and 2 data "Landsat-2" "MSS" 3264 2983 striped, SNF clear of cloud cover" "22-JAN-87" 69 165 2.3 103.4 "3000S870122" "Snow covered , SNF has "SPOT" "HRV2" 3000 3000 some cirrus" "23-JUL-90" 36 131 0 0 "2983M900723" "Band 1 and 2 data "Landsat-4" "MSS" 3264 2983 striped, som e cumulus outside SNF" "23-JUN-75" 35 125 0 0 "2983M750623" "Band 1 and 2 data "Landsat-1" "MSS" 3264 2983 striped, SNF clear of cloud cover" "24-SEP-76" 54 144 0 0 "2983M760924" "Band 1 and 2 data "Landsat-2" "MSS" 3264 2983 striped, SNF clear of cloud cover" "24-SEP-87" 50 162 13.8 101.4 "3000S870924" "SNF clear of cloud "SPOT" "HRV1" 3000 3000 cover" "25-APR-84" 40 139 0 0 "5965T840428" "GSFC only po ssesses "Landsat-5" "TM" 6967 5965 subsection c overing SNF" "25-APR-87" 36 164 17.2 105.3 "3000S870425" "Heavy cirrus cloud "SPOT" "HRV2" 3000 3000 cover in nor thern SNF" "28-JUL-87" 31 155 7.3 104 "3000S870728" "SNF clear of cloud "SPOT" "HRV1" 3000 3000 cover" "28-JUN-84" 32 129 0 0 "2983M840628" "Data problem not fully "Landsat-5" "MSS" 3264 2983 understood, sent back to no avail (scaled?)" "31-JUL-90" 38 130 0 0 "2983M900731" "Band 1 and 2 data "Landsat-5" "MSS" 3264 2983 striped, SNF clear of cloud cover" "31-MAY-87" 27 165 26.2 106.6 "3000S870531" "Heavy cumulu s cloud "SPOT" "HRV2" 3000 3000 cove r throughout SNF" _________________________________________________________________ Footnote: For presentation in this document, some padding blanks may have been eliminated between columns in the Sample Data Record. Due to the many fields in this data file, these columns will wrap while viewing. The actual data files, however, are column delimited with an adequate record length to prevent wrapping. See the Data Format Section for conventions used for missing data values in the data file. 8. Data Organization: Key fields in each record are observation date (obs_datc), platform and sensor; Data Granularity: This data set consists of a single ASCII file containing counts of vegetation individuals and average percent cover at each site by those vegetation species for all canopy layers. A general description of data granularity as it applies to the IMS appears in the EOSDIS Glossary. Data Format: The data files associated with this data set consist of numeric and character fields of varying lengths aligned in columns. The first row of each data file contains the 8 character SAS variable name that links to the data format definition file. Character fields are enclosed in double quotes and numeric fields are listed without quotes. Missing data values can be of two varieties: 1. Values that were identified as missing in the original data files. Missing numeric values of this type are identified in these data as -999. 2. Those holes that were created as a result of combining files that contained a slightly different variable set. Missing values of this type are identified in these data files as empty double quotes for character fields and a single period, '.' for numeric fields. 9. Data Manipulations: Not available. 10. Errors: Sources of Error: Not available. Quality Assessment: Data Validation by Source: Not available. Confidence Level/Accuracy Judgment: Not available. Measurement Error for Parameters: Not available. Additional Quality Assessments: Not available. Data Verification by Data Center: The Superior National Forest data was received from the Goddard Space Flight Center in three media: * As data dumps from the original Oracle SNF database maintained by GSFC, transferred electronically from the GSFC system to the ORNL system; * As ASCII files that mirrored the tables published in the Tech Memo; and * As hard copy (Tech Memo). Data from both electronic sources were input into SAS by ORNL DAAC data management staff and compared using computer code developed to process the SNF data. In many cases, the data values from both sources were found to be identical. In some cases, however, differences were identified and the providers of the data were consulted to resolve inconsistencies. Additionally, some variable columns were available in one source, but not the other for various reasons. For example, some calculated variables/columns were provided in the ASCII files (reflecting the Tech Memo tables) that were not stored in the Oracle database for purposes of space conservation. For similar reasons, coded values were used for many of the site and species identifier variables. A separate reference table was provided to link the coded variable with its definition, e.g., the SPECIES_REF file and the SITE_REF file. The database produced by the ORNL DAAC is a hybrid product that is a composite of data and information extracted from all three source media. In data sets where coded variables were included, the code definition variables have been added to improve usability of the data set as a stand-alone product. Therefore the ASCII files that are available through the ORNL DAAC on-line search and order systems are output from a data set that is a product of the essential core of numeric data provided by the data source (GSFC), augmented with additional descriptive information provided by GSFC and reorganized by the ORNL DAAC into a data structure consistent with other similar data sets maintained by the ORNL DAAC. 11. Notes: Limitations of the Data: Not available. Known Problems with the Data: Problems with the data are recorded in the Comment field of the data file. Usage Guidance: Not available. Any Other Relevant Information about the Study: None. 12. Application of the Data Set: Not available. 13. Future Modifications and Plans: None known at this revision. 14. Software: Not available. 15. Data Access: Contact Information: ORNL DAAC User Services P.O. Box 2008 Mail Stop 6407 Oak Ridge National Laboratory Oak Ridge, TN 37831-6407 Telephone: (423) 241-3952 FAX: (423) 574-4665 Email: ornldaac@ornl.gov Data Center Identification: EOSDIS Distributed Active Archive Center P.O. Box 2008 Mail Stop 6407 Oak Ridge National Laboratory Oak Ridge, TN 37831-6407 USA Telephone: (423) 241-3952 FAX: (423) 574-4665 Email: ornldaac@ornl.gov Procedures for Obtaining Data: Users may place requests by letter, telephone, electronic mail, FAX, or personal visit. Data is also available via the World Wide Web at http://www-eosdis.ornl.gov. Data Center Status/Plans: The Superior National Forest Data is available from the ORNL DAAC. Please contact the ORNL DAAC User Services Office for the most current information about these data. 16. Output Products and Availability: Available online, as a computer FTP file (zipped or unzipped), on tape or IBM-formatted diskettes. 17. References: Not available. Archive/DBMS Usage Documentation. Contact the EOS Distributed Active Archive Center (DAAC) at Oak Ridge National Laboratory (ORNL), Oak Ridge, Tennessee (see the Data Center Identification Section). Documentation about using the archive and/or online access to the data at the ORNL DAAC is not available at this revision. 18. Glossary of Terms: A general glossary for the DAAC is located at EOSDIS Glossary. 19. List of Acronyms: TM Thematic Mapper MSS Multispectral Scanner URL Uniform Resource Locator A general list of acronyms for the DAAC is available at http://cdiac.esd.ornl.gov/cdiac/pns/acronyms.html. 20. Document Information: Document Revision Date: October 17, 1996. Document Review Date: February 25, 1997. Document ID: ORNL-SNF_SAT_INV. Citation: Please cite the following NASA Technical Memorandum 104568 in any work or any publication using these data: Hall, F.G., K.F. Huemmrich, D.E. Strebel, S.J. Goetz, J.E. Nickeson, and K.D. Woods, July 1992. Biophysical, Morphological, Canopy Optical Property, and Productivity Data From the Superior National Forest. NASA Technical Memorandum 104568. National Aeronautics and Space Administration, Washington, D.C. 20546. Document Curator: Donna O. Lambert dlambert@daacs.esd.ornl.gov Document Author: Merilyn J. Gentry mjg@walden.rmt.utk.edu Document URL: http://www-eosdis.ornl.gov /SNF/guides/satellite_image_inventory.html _________________________________________________________________ SNF Home Page | Oak Ridge DAAC Home Page | ORNL Home Page ORNL DAAC User Services Office: 423-241-3952; email ornldaac@ornl.gov Web Document Curator: Sarah Jennings, xqj@ornl.gov Document Editor: Donna Lambert Revision Date: September 24, 1997 URL: http://www-eosdis.ornl.gov /SNF/guides/satellite_image_inventory.html