NOAA AVHRR and TOVS Digital CCT product in SHARP level 2B formatEntry ID: AVHRR.TOVS.SHARP2B
Abstract: SHARP is the ESA Earthnet format for AVHRR and TOVS data generated to provide
an easy data access for the international Remote sensing user community.
SHARP-1 consists of two volumes: AVHRR volume and TOVS volume. In order to
save user time of extracting from the raw data the useful quantities needed for
the problem in in hand, a family of high er level products has been ... proposed by
Earthnet: this is SHARP level-2.
The SHARP level-2A (Geophysical Product) contains geophysical parameters
extracted from AVHRR raw data (Vegetation Index and Sea Surface Temperature) as
well as calibrated data and a classification of the image.
Each pixel contains image data (calibrate), a classification and geographical
information (boundaries, coastlines and lat/long grid flags). Each pixel
consists of 2 bytes; 10 bits are used for image data, 3 bits for the
classification and 3 bits for geographical data. The classification includes
land, cloud, sea, snow/ice and unclassified pixels.
SHARP-2 products are produced from archived SHARP-1 day-time data. SHARP-2
products will not be archived. TOVS data remains the same as for SHARP-1
The SHARP-2B product consists of:
- 2 bands (1 and 5) containing class depending geophysical parameters
- 3 bands (2,3 and 4) containing calibrated data converted in equivalent
Reflectance (band 2),
AVHRR channel 3 spectral Radiance (band 3) and AVHRR channel 4 Brightness
Temperature (band 4).
Characteristics of Band 1, Class dependent parameter:
Land: Normalized Difference Vegetation Index (NDVI)
Sea: Equivalent Reflectance from Channel 1
cloud: Equivalent Reflectance from Channel 1
snow/ice: Equivalent Reflectance from Channel 1
glint: Equivalent Reflectance from Channel 1
unclass: Equivalent Reflectance from Channel 1
Characteristics of other Bands:
Band 2: Channel 2 Equivalent Reflectance
Band 3: Channel 3 Spectral Radiance
Band 4: Channel 4 Brightness Temperature
Band 5 over sea: Sea Surface Temperature (SST)
Band 5 over other areas: Brightness Temperature from Channel 5.
Note: 'Band' refers to the output data structure of the SHARP products.
'Channel' refers to the input satellite data acquired in different wavelengths.
This product can be produced with data from all the operating NOAA satellites;
however, if the data is derived from the even-numbered satellites, band 5 is
Image navigation (location) is carried out during Level 1 data generation,
using the orbital model for the satellite location and is tested by an operator
who carries out further correction if necessary. SHARP-2 products are in the
original spacecraft projection. A location grid of tie points (lat/long) is
given in the suffix data (every 16th image file record).
To order data, please see
(Click for Interactive Map)
Quality This program is public domain and is released on the condition that neither the
U.S Geological Survey nor the United States Government may be held liable for
any damages resulting from their authorized or unauthorized use.
Access Constraints SEAWAT is written in Fortran 77 with the following extensions: use of variable
names longer than 6 characters, Fortran 90 statements for dynamic memory
allocation, the DFLIB library and the DTIME function, and the FORM='BINARY'
option with the open statement. Generally, the program is easily installed on
most computer systems. The code has been used on personal computers with
several different versions of the WINDOWS operating system.
Distribution Media: Online
Distribution Size: 7.07MB
Distribution Format: ZIP file
Fees: No fees
Role: SERF AUTHOR
Phone: (301) 614-6898
Email: Tyler.B.Stevens at nasa.gov
NASA Goddard Space Flight Center Global Change Master Directory
Province or State: MD
Postal Code: 20771
Role: TECHNICAL CONTACT
Email: langevin at usgs.gov
U.S. Geological Survey 9100 N.W. 36th Street Federal Reserve Bank Bldg., Rm 107
Province or State: FL
Postal Code: 33178
Creation and Review Dates