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. Although 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:
- Data Set Overview
- Investigator(s)
- Theory of Measurements
- Equipment
- Data Acquisition Methods
- Observations
- Data Description
- Data Organization
- Data Manipulations
- Errors
- Notes
- Application of the Data Set
- Future Modifications and Plans
- Software
- Data Access
- Output Products and Availability
- References
- Glossary of Terms
- List of Acronyms
- Document Information
SNF Satellite Image Data Inventory.
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. Although 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.
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.
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.
Not available.
Not available.
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
Biophysical, Morphological, Canopy Optical Property, and Productivity Data on
the Superior National Forest.
Dr. Forrest G. Hall
NASA Goddard Space Flight Center
Fax: +1 (301)
614-6659
Telephone: +1 (301) 614-6695
E-mail: fghall@ltpmail.gsfc.nasa.gov
Not available.
Satellite.
- LANDSAT-1
- LANDSAT-2
- LANDSAT-3
- LANDSAT-4
- LANDSAT-5
- SPOT-1
Not available.
Observation date (obs_datc), platform, and sensor.
Not available.
Not available.
Not available.
Not available.
Not available.
Not available.
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.
This data set contains an inventory of data collected from July 1973 to
August 1990.
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"
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, cumulus in
southern part 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, scattered
cumulus in SNF"
"04-OCT-87" 53 167 3.3 102.7 "3000S871004" "Some cirrus cloud cover
"SPOT" "HRV2" 3000 3000 in Eastern SNF"
"05-JUL-76" 40 117 0 0 "2983M760705" "Band 1 and 2 striped,
"Landsat-1" "MSS" 3264 2983 few cumulus, southern
portion of scene cut off"
"05-JUN-82" 34 133 0 0 "2983M820605" "Line start error N and
"Landsat-3" "MSS" 3264 2983 W of Ely, SNF 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 portion 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, southern half
of SNF cut off"
"13-AUG-87" 35 155 3.6 102.6 "3000S870813" "Few scattered cumulus"
"SPOT" "HRV1" 3000 3000 striped, southern half
of SNF cut off"
"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, some 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 for 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, SNF 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, some 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 possesses
"Landsat-5" "TM" 6967 5965 subsection covering
SNF"
"25-APR-87" 36 164 17.2 105.3 "3000S870425" "Heavy cirrus cloud
"SPOT" "HRV2" 3000 3000 cover in northern 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 cumulus cloud "SPOT" "HRV2" 3000 3000 cover throughout SNF"
Footnote:
Key fields in each record are observation date (obs_datc), platform, and
sensor.
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.
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:
- Values that were identified as missing in the original data files. Missing
numeric values of this type are identified in these data as -999.
- 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.
Not available.
Not available.
Not available.
Not available.
Not available.
Not available.
The Superior National Forest data were 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.
Not available.
Problems with the data are recorded in the Comment field of the data file.
Not available.
None.
Not available.
None known at this revision.
