November 78 - June 86 Global Composite
For most regions of the world, the color of the ocean is determined
primarily by the abundance of phytoplankton and their associated
photosynthetic pigments. As the concentration of phytoplankton
pigments increases, ocean color shifts from blue to green. Taking
advantage of this change, NASA developed the Coastal Zone Color
Scanner (CZCS) which was launched on the Nimbus-7 satellite in October
1978. During its 7 1/2 year lifetime (October 1978 - June 1986), CZCS
acquired nearly 68,000 images, each covering up to 2 million square
kilometers of ocean surface.
The Coastal Zone Color Scanner (CZCS) was a multi-spectral line scanner
devoted principally to measurements of ocean color. It had six spectral
bands (channels). There were four channels devoted to ocean color, each of
20 nanometer band width and centered at 443, 520, 550, and 670 nanometers.
These are referred to as channels 1 through 4, respectively. Channel 5
sensed reflected solar radiance and had a 100 nanometer bandwidth centered
at 750 nanometers and a dynamic range which was more suited to land.
Channel 6 operated in the 10.5 to 12.5 micrometer region and sensed
emitted thermal radiance for derivation of equivalent black body
temperature. The CZCS level 1, 2 and 3 data products are available
from the Goddard Space Flight Center (GSFC) Distributed Active
Archive Center (DAAC).
Table of Contents
-
- Dr. Gene Feldman
- Goddard Space Flight Center, Code 902.3
- Greenbelt, MD 20771
- (301)286-9428
- Internet:gene@seawifs.gsfc.nasa.gov
- Dr. Chuck McClain
- McClain - Goddard Space Flight Center, Code 971
- Greenbelt, MD 20771
- (301)286-8134
- Internet:mcclain@calval.gsfc.nasa.gov
- Dr. Wayne Esaias
- Goddard Space Flight Center, Code 971
- Greenbelt, MD 20771
- (301)286-5465
- Internet:wayne@petrel.gsfc.nasa.gov
Coastal Zone Color Scanner
- CZCS Data -
- Dr. Gene Feldman
- Goddard Space Flight Center, Code 902.3
- Greenbelt, MD 20771
- (301)286-9428
- Internet:gene@seawifs.gsfc.nasa.gov
- DSP Software -
- Dr. Bob Evans
- University of Miami, RSMAS/MPO
- 4600 Rickenbacker Causeway
- Miami, FL 33149
- (305)361-4799
- r.evans/omnet
-
-
-
For most regions of the world, the color of the ocean is determined primarily
by the abundance of phytoplankton and their associated photosynthetic
pigments. As the concentration of phytoplankton pigments increases, ocean
color shifts from blue to green. The Coastal Zone Color Scanner (CZCS),
was a multi-spectral line scanner developed by NASA to measure ocean color
as a means of determining chlorophyll concentrations and the distributions of
particulate matter and dissolved substances.
-
The purpose of the CZCS on Nimbus-7 was to obtain a better understanding of
the temporal and spatial distribution of phytoplankton biomass and primary
production, and a better understanding of the processes regulating the growth
of phytoplankton and of the processes influencing the ultimate fate of this
organically fixed carbon. Satellite observations of ocean color were
necessary to provide reliable estimates of marine phytoplankton biomass on
synoptic scales which are useful in studies of phytoplankton processes. The
mission objectives for the CZCS were to obtain observations of ocean color
and temperature, particularly in the coastal zones, which would provide data
with sufficient spatial and spectral resolution for the following applications:
- Measure concentrations of chlorophyll-a and phaeophytin.
- Map biologically productive areas.
- Map suspended sediment distribution and determine the type of materials suspended in the water.
- Map Gelbstoffe (yellow substances) as an indicator of salinity.
- Detect pollutants in the upper level of the oceans.
- Map temperature of coastal waters and the open ocean.
- Study the interactions between coastal effluents and open waters.
-
- Level 1
- Data contain at-spacecraft raw radiance counts with calibration and
earth location information appended, but not applied. It had six spectral
bands (channels):
- four devoted to ocean color, each of 20 nanometer band width and
centered at 443, 520, 550, and 670 nanometers. These are referred to as
channels 1 through 4, respectively.
- Channel 5 sensed reflected solar radiance, but had a 100 nanometer
bandwidth centered at 750 nanometers and a dynamic range which was more
suited to land.
- Channel 6 operated in the 10.5 to 12.5 micrometer region and sensed
emitted thermal radiance for derivation of equivalent black body temperature.
- Level 2 and Level 3
- Level 2 and 3 data contain six
derived geophysical parameters for each CZCS scene:
- Phytoplankton Pigment Concentrations
- Diffuse Attenuation Coefficient
- Normalized Water-Leaving Radiance @ 440 nm
- Normalized Water-Leaving Radiance @ 520 nm
- Normalized Water-Leaving Radiance @ 550 nm
- Aerosol Radiance @ 670 nm
The theory of measurement is based on the fact that the content of water, be
it organic or inorganic particulate matter or dissolved substances, affects
its color. Ocean water, containing very little particulate matter, scatters
as a Rayleigh scatterer with the well known deep purple or bluish color of
the ocean. As particulate matter is added to the water, the scattering
characteristics are changed and the color is changed. Phytoplnakton, for
instance, have specific absorption characteristics and normally change the
water to a more greenish hue although some phytoplankton, such as the various
red tide, can change the water to colors such as red, yellow, blue-green, or
mahogany. By sensing the color with very high signal-to-noise ratios, the
CZCS provides a mechanism for analyzing that color for the content of the
water. Inorganic particulate matter in water, such as the terrigenous
outflow from rivers, has a different color from organic material typically
brownish in color but sometimes varying with red.
-
-
The CZCS had a scan width of 1556 km centered on nadir and the ground
resolution was 0.825 km at nadir. The following lists the sensor's channels
and the primary purpose of each:
- Reflected solar energy was measured in 5 channels:
- 1 433-453 nm (blue) chlorophyll absorption
- 2 510-530 nm (green) chlorophyll concentration
- 3 540-560 nm (yellow) Gelbstoffe concentration
- 4 660-680 nm (red) aerosol absorption
- 5 700-800 nm (far red) land and cloud detection
- Infrared radiation was measured in one channel:
- 6 10.5-12.5 microns (infra-red) surface temperature
For further details, please consult The Nimbus 7 User's Guide (see reference below).
CZCS was launched aboard Nimbus-7 in October 1978. Due to the power demands
of the various on-board experiments the CZCS operated on an intermittent
schedule. The infra-red/temperature sensor (channel 6 10.5-12.5 microns)
failed within the first year. Sometime in 1981 it was determined that the
sensitivity of the other CZCS sensors was degrading with time, in particular
channel 4. Sensitivity degradation was persistent and increased during the
rest of the mission. In mid 1984 NIMBUS-7 Mission personnel experienced
turn-on problems with the CZCS system which were related to power supply
problems and the annual lower power summer season of NIMBUS-7. Also
spontaneous shut down of the CZCS system began occurring. These also
persisted for the rest of the mission. From March 9, 1986 to June, 1986 the
CZCS system was given highest priority for the collection of a
contemporaneous data set of ocean color. It was turned off in June at the
start of the low power season with the intention of turning it back on in
December when power conditions would be more favorable. Attempts to
reactivate the CZCS system in December 1986 failured. The CZCS sensor was
officially declared non-operational as of 18 December 1986.
NIMBUS-7 was launched in October 1978 and was a research-and-development
satellite serving as a stabilized, earth-observing platform for the testing
of advanced systems for sensing and collecting data in the pollution,
oceanographic and meteorological disciplines. It provided an opportunity to
assess each instrument's operation in the space environment and to collect a
sizable body of data with the global and seasonal coverage needed for support
of each experiment. The mission also extended and refined the sounding and
atmospheric structure measurement capabilities demonstrated by experiments on
previous Nimbus observatories.
Nimbus-7 sensors included experiments were a limb infrared monitoring of the
stratosphere (LIMS), stratospheric and mesopheric sounder (SAMS),
coastal-zone color scanner (CZCS), stratospheric aerosol measurement
(SAM II), earth radiation budget (ERB), scanning multichannel microwave
radiometer (SMMR), solar backscatter UV and total ozone mapping spectrometer
(SBUV/TOMS), and temperature-humidity infrared radiometer (THIR). These
sensors were capable of observing several parameters at and below the
mesospheric levels. After 11 years in orbit, three experiments, SAM II,
SBUV/TOMS, and ERB, are still functioning successfully. Several more years
of operation are anticipated.
Nominal orbit parameters for the Nimbus-7 spacecraft are:
Launch date 10/24/78
Orbit Sun-synchronous, near polar
Nominal Altitude (km) 955
Inclination (deg) 104.9
Nodal Period (min.) 104
Equator Crossing Time 1200 noon (ascending)
Nodal Increment (deg) 26.1
The CZCS was a cross-track scanning system. The Instrument Field of View
(IFOV) of each detector was .865 mrad, yielding a resolution of 825 m at the
satellite subpoint. The swath covered 1566 km in width from a maximum scan
angle of approximately 40 degrees. Data were then transmitted to a receiving
station at a rate of 800 kbps.
Samples/ Samples/ Quantizing
Bands Scan Sec Resolution
1 through 6 1,970 94,560 8-bit
(256 levels)
NASA
Prelaunch calibration of the CZCS used a 76 centimeter diameter integrating
sphere as a source of diffuse radiance for channels 1 through 5 and a
blackbody source for calibration of channel 6. The integrating sphere was
especially constructed for calibration of the CZCS and was calibrated from a
standard lamp from the National Bureau of Standards utilizing a spectrometer
and another integrating sphere to transfer calibration from the lamp to the
sphere.
In addition to the sphere and the blackbody, a collimator was used to
calibrate the CZCS in vacuum testing. In-flight calibration of the CZCS is
accomplished for the first five bands by using a built-in incandescent light
source. This in-flight calibration source was calibrated using the instrument
itself as a transfer against the referenced sphere output.
Channel 6 is calibrated by viewing the blackened housing of the instrument
whose temperature is monitored. Deep space is another calibration viewed
during the 360 degrees rotation of the scan mirror.
The raw data from the six channels of the CZCS were either directly
transmitted to the ground station in real-time or recorded on the
satellite tape recorder for later playback and transmission to the
ground station. Data were stored on magnetic tape and sent to the Image
Processing Division (IPD) at Goddard Space Flight Center (GSFC). In
addition to radiance measurements, these data also include the calibration
lamp data and Image Location Data (ILT).
-
-
Information is not available yet.
-
Information is not available yet.
- Levels 1, 1a, 2
- Each granule is a single CZCS scene with a maximum of 2 minutes of data.
- Level 3
- Each granule is either a single global or regional composite
representing
- a daily, weekly, monthly or annual average.
-
Spatial Coverage is global with an emphasis on coastal regions.
- The level 1 and level 2 scenes are partial orbital swaths. In one
two-minute data segment, the CZCS covers approximately 1.3 million square
kilometers of the ocean surface.
- The level 3 products are full global images.
- There are also some level 3 products which are sectored regional images.
These regional images have the following upper left corner (ulc) and lower
right corner (lrc) latitudes and longitudes.
REGION ulc lat.,lon. lrc lat.,lon.
North Atlantic 69.873, -88.506 -19.951, 1.318
N.E. Pacific 61.260, -162.334 -28.564, -72.500
South America 19.600, -114.873 -70.225, -25.049
Mediterranean 69.873, -34.014 -19.951, 55.811
India 31.025, 10.811 -58.799, 100.635
Japan 66.812, 89.912 -23.643, 179.736
Australia 16.963, 89.912 -72.861, 179.736
-
- Level 1
- CZCS had a scan width of approximately 1600 kilometers with
- a spatial resolution at nadir of 800 meters in each of the
- 6 co-registered channels.
- Level 1a
- Subsampled level 1 data (every 4th pixel, every 4th line) have a
- spatial resolution of about 4 km at nadir.
- Level 2
- Derived geophysical parameters have a spatial resolution of
- about 4 km at nadir.
- Level 3
- Level 3 earth-gridded data has approximately 18.5 km resolution at the equator.
- Level 1 and Level 2
- Satellite swath projection
- Level 3
- Equal Angle Grid
Composited earth-gridded data are binned to a fixed, linear
latitude-longitude (equal angle) grid of dimension 1024 (latitude) x 2048
(longitude) with ~18.5 km resolution at the equator.
-
-
The archive of CZCS data products began with November 2, 1978 and continued
until June 22, l986. However, there are several periods of intermittent
coverage. When operating full time, approximately 400 images were collected
each month.
-
Each scan of the CZCS viewed the Earth for approximately 27.5 microseconds.
During this period, each channel of the analog data output was digitized to
obtain a total of about 2000 samples. Successive scans occur at the rate of
8 per second. These data are compiled onto daily, weekly and monthly mosaics.
-
-
- Level 1:
- Level 1 data contain at-spacecraft raw radiance counts with calibration
and earth location information appended, but not applied.
- Level 2 and Level 3:
- Level 2 and 3 data contain six derived geophysical parameters for each CZCS scene.
-
Level 1
Visible and infrared radiances were measured in six spectral channels by
CZCS. The spectral region and band widths of the six channels and primary
use of each are indicated in the following table:
Channel/Band Spectral Band Primary purpose
(micrometers)
------------ ------------- ---------------------------
1 0.433 - 0.453 Chlorophyll absorption
2 0.510 - 0.530 Chlorophyll correlation
3 0.540 - 0.560 Yellow substance
4 0.660 - 0.680 Aerosol correction
5 0.700 - 0.800 Land/cloud flag
6 10.5 - 12.5 Surface temperature; failed shortly after launch
Level 2 and Level 3 Parameters
- Phytoplankton Pigment Concentrations
- Diffuse Attenuation Coefficient
- Normalized Water-Leaving Radiance @ 440 nm
- Normalized Water-Leaving Radiance @ 520 nm
- Normalized Water-Leaving Radiance @ 550 nm
- Aerosol Radiance @ 670 nm
-
Level Parameter Unit Resolution
1 Calibrated radiances mW/(cm2.sr.micron) 1 km x 1km
1a Calibrated radiances mW/(cm2.sr.micron) 4 km x 4 km
2 Pigment Concentration mg/m3 4 km x 4 km
Diffuse Attenuation Coeff none 4 km x 4 km
Normalized water-leaving mW/(cm2.sr.micron) 4 km x 4 km
radiance @ 440 nm
Normalized water-leaving mW/(cm2.sr.micron) 4 km x 4 km
radiance @ 520 nm
Normalized water-leaving mW/(cm2.sr.micron) 4 km x 4 km
radiance @ 550 nm
Aerosol radiance @ 670 nm mW/(cm2.sr.micron) 4 km x 4 km
3 All none 20km
-
The CZCS was flown aboard the Nimbus-7 satellite.
The following lists the data formats of the various CZCS products:
Data Format
Level 1 CRTT
Level 1a DSP
Level 2 DSP
Level 3 PST DSP
Level 3 COMP DSP
Level 3 flat files FLAT IMAGE FILES
Calibrated Radiance and Temperature Tape (CRTT) FORMAT:
The original Level 1 CZCS data was produced and stored on 9-track magnetic
volumes in CRTT Tape format. The CRTT Tape format has been retained for the
most part. The Nimbus-7 Coastal Zone Color Scanner Level 1 Data Product
User's Guide for a complete description of the CRTT Tape format. This Guide
may be ordered from the DAAC User Support Office (see Data Access below).
When the data were transferred onto digital optical disks, the files in
CRTT Tape format were modified slightly to create files in CRTT Archive
format. The level 1 files available from the DAAC are in CRTT Archive
format. The CZCS Revised Level 1 Format document details the differences
between the CRTT Tape and Archive formats.
The University of Miami's Rosentiel School of Marine and Atmospheric
Sciences has written a program called CRRTWRITE which will generate a
CRT format tape from NASA CRTT Archive format files.
DSP FORMAT
Level 1a, level 2, level 3 PST images and level 3 COMP images are in DSP
format. DSP is a user-interactive satellite data analysis package that was
developed at the Rosenstiel School of Marine and Atmospheric Sciences
(University of Miami). DSP operates on either DEC-VAX or Unix Workstation
computers. The primary application of this package is for the processing
and interpretation of CZCS and Advanced Very High Resolution Radiometer
(AVHRR) data. DSP images can be converted to the SEAPAK format using the
SEAPAK package (see description below).
For more information on the DSP format please contact the Rosenstiel
School of Marine and Atmospheric Sciences at the University of Miami
(see DSP, section 4.3.2).
LEVEL 3 FLAT IMAGE FILE FORMAT
Level 3 Sample Images
Several additional time/space composites (climatological, seasonal,
annual, regional) also exist as single parameter images. These are
available as flat data files, without any headers, metadata or compositing
statistics. These include full resolution global 2048 (longitude) x 1024
(latitude) pixel images as well as reduced resolution global 512 x 512 pixel
images subsampled from the full global images with a 4 x 2 reduction factor.
These regional images (spatial coordinates tabulated in section 9 above) are
512 x 512 pixel images at full resolution of the global product. They are
simply a sector of the full global 2048 x 1024 composite grid. They are
composed of 512 records, each record 512 eight bit bytes and each pixel
value given by a count ranging between 0 and 255. Please consult the CZCS
README file available from the GSFC DAAC for further information on these
level 3 flat image files.
Information is not available yet.
-
The greatest problem encountered in analyzing the CZCS data was in the
correction for atmospheric interference. In the visible portion of the
spectrum, the largest contribution to the signal received by the CZCS is from
the atmosphere. Rayleigh and aerosol scattering in the atmosphere must be
compensated for before a high degree of accuracy in the determination of
pigment concentration and diffuse attenuation coefficient can be obtained.
The calibration procedure is quite complex and will not be discussed in
detail here. In essence the Rayleigh component is assumed constant and can be
subtracted from the signal. Aerosol scattering is variable and is measured by
assuming that the red region of the spectrum is completely absorbed by the
ocean surface and is therefore returning no signal to the instrument.
From this assumption, aerosol scattering can be calculated for the rest of
the visible spectrum. References 11.2.b and 11.2.c describe these principles
in detail. The final data are in the form of calibrated radiances.
Chlorophyll concentration algorithms were used to reduce the data produced
from the Level I radiance data base to concentration imagery. Basically,
these algorithms use radiance data ratios to determine concentrations.
Channels 1 and 3 were used for concentrations less than 1.5 mg/m**3 and
channels 2 and 3 for concentrations above that level. These algorithms
also account for the atmospheric scattering present, both Rayleigh and
aerosol, by empirical coefficients in the equations for concentration.
The Rayleigh component was assumed constant and can be subtracted from the
signal. Aerosol scattering is variable and was measured by assuming that
the red region of the spectrum is completely absorbed by the ocean surface
and is therefore returning no signal to the instrument.
At the IPD at GSFC the data were converted from voltages to radiances for
bands 1 through 5, and to equivalent blackbody temperatures for band 6.
Algorithms developed by the CZCS Nimbus Experiment Team (NET) were then
applied to produce data of suspended and dissolved materials on the water.
These algorithms were improved several times during the lifespan of the
instrument, especially for retrieval of water properties in sediment-laden
coastal regions.
The Level 1 radiance data were used to produce black and white images.
The data were then processed through a pigment concentration algorithm
and diffuse attenuation coefficient algorithm to produce Level 2 and 3
products. The images have been written onto both Calibrated Radiance
Chlorophyll Sediment Tapes (CRCSTs) and Sony optical disks. The optical
disk images were generated using a newer algorithm than that used to
generate the CRCSTs. The Level 3 products are global mosaics of derived
parameters in image format.
The entire CZCS digital archive has been converted from the original
1600-bpi magnetic tape to Sony digital optical disk at the NASA/GSFC
Space Data and Computing Division. The data format is nearly identical
to the Calibrated Radiance and Temperature Tape (CRTT) product.
The Level 2 data were reprocessed at the Goddard Space Flight Center using
the DSP analysis/processing system (see RELATED SOFTWARE)
developed by the
Rosenstiel School for Marine and Atmospheric Science at the University of
Miami. DSP offers improved algorithms for the derivation of diffuse
attenuation coefficient, water-leaving radiance, and aerosol radiances.
After reprocessing, Level 3 image products were then produced from these
Level 2 products.
-
Information is not available yet.
- Information is not available yet.
-
Scenes flagged as containing unreliable data were not included in the
subsequent global composites. However, they are still available from the
archive as Levels 1, 1a and 2. For the scenes that pass the quality control
step, composites of derived geophysical parameters at daily, weekly,
monthly, seasonal and annual time scales were produced, including all the
relevant compositing statistics. All the archive products are stored on
optical disc making subsequent retrieval, analysis and distribution more
convenient. The processing and quality control procedures are linked
through data base control producing a comprehensive and consistent data
base for all CZCS holdings. Many duplicates and errors have thereby been
eliminated. The data base entries also provide the framework for the browse,
archiving and search operations.
Several large ship expeditions have been made to validate the derived CZCS
data products. Most of these were conducted off the North American coasts,
but other investigations in European and South African waters have also
been conducted.
Data verification and correlation were done using data obtained from a
number of research vessels:
Nov 1978 RV GYRE and RV ATHENA II
Jun 1979 RV ATHENA II and RV OCEANUS
Sep 1979 RV NEW HORIZONS and USC VELARO
The CZCS has performed better than its design requirements for
signal-to-noise ratio in all channels. The table below shows the minimum
signal-to-noise ratio specified for the instrument at its most sensitive
gain setting.
Channel/ Signal/Noise
Band Ratio (mW/cm**2-ster) Radiance NETD Temp
1 150 5.41
2 140 3.50
3 125 2.86
4 100 1.34
5 100 10.8
6 N/A N/A 0.220K 270K
In the worst case, the concentration can be determined within a factor of 2 of the actual concentration.
Information is not available yet.
Information is not available yet.
The Goddard DAAC has not performed data verification on the CZCS dataset.
-
-
Information is not available yet.
-
- The internal metadata in the header and trailer documentation records for
level 1 files is known to be erroneous in several instances.
- Usage of levels 1a, 2, and 3 data independent of the DSP or SEAPAK data
analysis packages is limited.
- Level 1a and level 2 documentation is incomplete.
-
CZCS data are used for the analysis of chlorophyll and sediment
concentrations while the channel 6 temperature data are used for sea
surface temperature mapping. New data users are encouraged to contact a
member of the NASA/GSFC DAAC prior to attempting to use CZCS data.
There is an analog optical disk browse and order facility for quickly
searching through the entire Level 2 and Level 3 data sets. Data can be
ordered on-line. Several regional browse facilities have been established by
NASA at academic and research institutions.
-
Assumptions in the atmospheric correction of the data during processing
resulted in an accuracy of 35% in ocean color measurements in Case I waters
(chlorophyll and associated pigments determine the reflectance) and within a
factor of 2 generally.
Due to the limited duty cycle (10%) and the non-uniform coverage, sampling
was highly skewed. Temporal sampling frequency also varied, resulting in
potential errors. These limitations should be considered when analyzing
level 3 composites.
-
-
The Sea-viewing Wide Field-of-view Sensor
(SeaWiFS)
is scheduled to launch in 1995 as a follow-on to CZCS.
DSP Image File Format (Appendix D)
PC-SEAPAK User's Guide (Version 4.0)
SEAPAK User's Guide (VAX) (Version 2.0)
-
-
Nimbus-7 User's Guide
CZCS Level 1 Data Product Users' Guide
-
Scientific Reference Guide (from GSFC DAAC)
-
"Information on The GSFC Distributed Active Archive Center" flyer (from GSFC DAAC)
-
-
SEAPAK is a user-interactive satellite data analysis package that was
developed at the NASA/Goddard Space Flight Center. The primary application
of SEAPAK is for the processing and interpretation of Coastal Zone Color
Scanner (CZCS) and Advanced Very High Resolution Radiometer (AVHRR) data.
In addition, CZCS DSP images can be converted to the SEAPAK format using
the SEAPAK package.
Two versions of the SEAPAK CZCS processing software are available from NASA
Goddard Space Flight Center. PC-SEAPAK runs on PC-AT, 386, or 486 class
machines. UNIX-SEAPAK operates only on SGI's Unix Workstation. Beside
including most major programs in PC-SEAPAK to process CZCS and AVHRR
satellite data, Unix-SEAPAK also includes programs to handle ancillary data.
To obtain these programs see Software Access.
DSP is image processing software package developed at the Rosenstiel
School of Marine and Atmospheric Sciences of the University of Miami.
DSP images can be converted to the SEAPAK format in the SEAPAK package.
For information on the full applications,
requirements and availability of these systems, contact:
SEAPAK: Dr. Charles McClain
C.MCCLAIN (OMNET)
URCHIN::MCCLAIN (NSI-Decnet)
MCCLAIN@CALVAL.GSFC.NASA.GOV (Internet)
DSP: Dr. Robert Evans
R.EVANS (OMNET)
MIAMI::EVANS (NSI-Decnet)
- UNIX-SEAPAK
-
All the instructions for getting UNIX-SEAPAK and the updates are available
via anonymous ftp from
shark.gsfc.nasa.gov. Login as 'anonymous' (no
password required), then change directory to '/seapak'. The files
'ANNOUNCEMENT', 'README.SEAPAK.PLEASE!' in this directory contain
information about how to get UNIX-SEAPAK.
- PC-SEAPAK:
-
anonymous ftp from NASA Goddard Space Flight Center. To be able to use all
of PC-SEAPAK's graphics functions, you will need to have a Matrox graphics
board installed on your PC. Even if you do not have this board, the whole
PC-SEAPAK package should be installed. It will work on a PC without the
board but the you won't be able to run the display related programs.
If you do not have ftp capability, we can send you a non-display version of
PC-SEAPAK, on diskettes. This version is sent in order to minimize the
number of diskettes needed and will provide you a working, non-graphical
version of PC-SEAPAK.
On
shark.gsfc.nasa.gov, you will find several compressed files and one program
to decompress those files under the directory '/pcseapak/version4'. Use
'ftp' and login as 'anonymous' (no password required), change directory to
'/pcseapak/version4',
and copy over these files:
- seapak.zip - The compressed file that contains all the PC-
SEAPAK version 4.0 programs
data base file (in 5-minute resolution)
- ciadb.zip - The compressed file that contains the eight CIA world
data base files.
- pctoms.zip - The compressed file that contains nine PCTOMS data
base files.
- halo88.zip - The compressed file that contains HALO88 font files
and the driver program for the MVP-AT image board
- pkunzip.exe - The decompressing program to be used on PC to
decompress those compressed zip files.
UPDATES:
These update files have to be restored (in any temporary directory
using 'pkunzip') and installed (copied) IN ORDER into the SEAPAK
directory after you have installed the original PC-SEAPAK 4.0.
- update.zip
- update1.zip
- update2.zip
Download all of these files to the PC first. Then run PKUNZIP to
decompress all the ZIP files. Type PKUNZIP at the DOS prompt and you will
get a detailed description about how to use this command.
For example, to decompress all files in 'SEAPAK.ZIP' to the directory
'D:\SEAPAK', just type 'PKUNZIP SEAPAK.ZIP D:\SEAPAK'. All
other compressed files should
be decompressed the same way. It is recommended that you decompress
different zip files into different directories.
After all compressed files are restored, you need set up the SEAPAK
environmental variable, modify SEAPAK.FIG file if necessary, run the
programs SPKSETUP and INIT.
For further information, read SYSTEM ENVIRONMENT : SOFTWARE in the
PC-SEAPAK User's Guide. This User's Guide is available on request.
Contact the DAAC User Services Office
to request a copy of the
PC-SEAPAK User's Guide or to request a non-graphical version of PC-SEAPAK
on diskettes.
If you have any problem or need assistance with installing or using
PC-SEAPAK, please call Gary Fu at 301-286-7107 or send e-mail to
gfu@shark.gsfc.nasa.gov
Gary Fu is also involved in developing the SEADAS processing software for processing
SeaWiFS data.
GSFC DAAC
- GSFC DAAC User Services
- NASA/GSFC Code 902.2
- Greenbelt, MD 20771
- (301)614-5224
- (301)614-5268 fax
- Internet: daacuso@daac.gsfc.nasa.gov
- OMNET: DAACUSO.GSFC
GSFC DAAC
The central archive and distribution facility responsible for providing
access to the entire CZCS data set is at NASA's Goddard Space Flight Center.
There are several ways to access the data.
- GODDARD DAAC IMS
The primary means of access is through the Goddard DAAC IMS. The procedure is as follows:
Telnet daac.gsfc.nasa.gov (192.107.190.139)
username: daacims
password: gsfcdaac
First you will be asked for user information. A Search Inventory window will
then appear where you will supply your search criteria and then submit your
order.
- Coastal Zone Color Scanner Browse System
In addition to Goddard, a number of academic and research institutions
have been established by NASA to serve as regional browse, distribution and
analysis centers for Levels 1a, 2 and 3. These distributed archives have
resident copies of all Level 1a and higher data, and the necessary hardware
and software required for browsing, copying and reformatting the images.
The CZCS Browse Program was designed to provide a researcher with the ability
to quickly search the entire Level-2 CZCS data set and to instantly view the
color-coded phytoplankton pigment fields that meet the search criteria.
This version of the browse program also provides approximately 9,000 ship
(in situ) observations for comparison with the Level-2 data. Additionally,
researcher-specified 'movie loops' can be generated to allow study of
temporal changes.
Most of CZCS level 1 dataset currently is available from the GSFC DAAC IMS
and the ESDIS IMS. It's archive at the GSFC DAAC is scheduled for completion
by the late summer of 1994. The higher level products will be archived by
autumn of 1994. The higher level products will be available from the GSFC
DAAC IMS as they are archived. However, CZCS products that do not yet appear
in the IMS inventory may be ordered by contacting the GSFC DAAC User Services
Office (See Data Access).
-
-
- 8mm tape (8200 and 8500 bpi)
- 4mm tape
- 9 track tape (1600 and 6250 bpi)
-
- electronic transfer (ftp)
Information is not available yet.
-
CZCS Coastal Zone Color Scanner
EOSDIS Earth Observing System Data and Information System
ESDIS EOSDIS Data and Information System
IFOV Instrument Field of View
IMS Information Mangement System
Last update: Mon Oct 7 11:03:42 EDT 1996
Goddard DAAC Help Desk: 301-614-5224; daac@gsfc.nasa.gov
Web Curator: Daniel Ziskin -- webmaster@daac.gsfc.nasa.gov
NASA official: Paul Chan, DAAC Manager -- chan@daac.gsfc.nasa.gov