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General Description of the Product
The NOAA Decadal Data (Set) of the Commonwealth of Independent States (CIS) was created by the USGS/EROS Data Center* in the summer of 1991. The data set consists of ten channels of composited data obtained from the NOAA-11 (and -9) satellites and their Advanced Very High Resolution Radiometer (AVHRR) sensors in the Local Area Coverage (LAC) mode; i.e., at one-kilometer spatial resolution. These are a decadal product, in that temporal compositing of the NOAA/AVHRR-LAC data was done over ten- day periods. The time span of the 50-tape set currently at GRID-Geneva is from June 1986 to August 1990, but only the three summer months (June/July/August) are included, and even these are on an irregular basis within the five-year period.
The NOAA Decadal Data of the CIS are held by GRID-Geneva as 50 magnetic tapes (nine-track, 6250 bpi), which are copies of the original 50-tape set at the USGS/EDC. There are 25 decadal periods/pairs of tapes in total. No further processing of these data has been done in Geneva. A separate document describing the original geographic and temporal compositing as carried out at the USGS/EDC, which is indispensable both as a reference and when using this data set, is mentioned below.
Contents/Format Description of the 50-Tape Set
The NOAA Decadal Data of the C.I.S. cover most of the former USSR, with the exception of parts of northeastern Siberia and the Far East, and also include all of Eastern Europe and small portions of Western Europe (e.g., the Baltic Region and southern Scandanavia). The data are in the Lambert Azimuthal Equal Area projection, selected to best represent the geographic region of the C.I.S., and also to allow for area measurements. A single data file includes mosaicked satellite imagery or ancillary data for the entire area of coverage.
* - United States Geological Survey (USGS) / Earth Resources Observation Satellite (EROS) / Data Center; or USGS/EDC.
The temporal contents of each tape pair is as follows:
Tapes/Year/Month/Days Tapes/Year/Month/Days Tapes/Year/Month/Days ____________________ ____________________ ___________________
1,2 '86 June 01-10 7, 8 '86 July 01-10 3,4 '86 June 11-20 9,10 '86 July 11-20 5,6 '86 June 21-30
11,12 '87 June 01-10 17,18 '87 July 01-10 13,14 '87 June 11-20 19,20 '87 July 11-20 15,16 '87 June 21-30
21,22 '88 June 01-10 27,28 '88 July 01-10 23,24 '88 June 11-20 29,30 '88 July 11-20 25,26 '88 June 21-30 31,32 '88 July 21-31
33,34 '90 June 01-10 39,40 '90 July 01-10 45,46 '90 Aug. 01-10 35,36 '90 June 11-20 41,42 '90 July 11-20 47,48 '90 Aug. 11-20 37,38 '90 June 21-30 43,44 '90 July 21-31 49,50 '90 Aug. 21-31
Two tapes comprise each decadal pair, with five bands/channels per tape. Each of the tapes contains a single header file (with seven records), and one data file (with 17780 records of 6139 length), for a data file size 109.15142 Mbs. The data file contains a total of five channels of data or information, in band sequential (BSQ) format as follows:
Band 01: NOAA/AVHRR channel one; from 10-day composite value Band 02: NOAA/AVHRR channel two; " " " (Tape one Band 03: NOAA/AVHRR channel three; " " " Band 04: NOAA/AVHRR channel four; " " " each pair) Band 05: NOAA/AVHRR channel five; " " "
Band 06: NOAA/AVHRR maximum NDVI; from 10-day compositing Band 07: NOAA/AVHRR satellite zenith angle (Tape two Band 08: NOAA/AVHRR solar zenith angle Band 09: NOAA/AVHRR relative azimuth each pair) Band 10: NOAA/AVHRR history file
Each band/channel of data is 3556 records by 6139 bytes; thus for five bands the total of 17780 records. Number of records corresponds with rows or lines of data, and number of bytes corresponds with columns, elements, pixels or samples of data.
The source of the 50-tape data set is the USGS/EROS Data Center in Sioux Falls, South Dakota (S.D.) USA, where the original tapes were duplicated for GRID. The reference to the 50-tape data set is the "NOAA Decadal Data for the CIS Users' Guide", USGS/EDC, August 1991 (eight pages).