Global Land 1-KM AVHRR Project
CEOS/EDC Header Format
The archive header file used by the EDC Data Center is a Committee on Earth Observing Satellites (CEOS) Inventory Exchange Format (IEF) data exchange file. CEOS provides a three character abbreviation for all participating archive centers and receiving stations. Throughout the rest of this document the acronym SFL refers to the EDC Data Center.
The CEOS_IEF file contains the following:
1) A variable number of header records each 80 bytes in length. Each record must start with "/*" and end with "*/".
2) A variable number of inventory exchange records containing two 80 character lines. Each line contains a number of fields separated by blanks. All CEOS_IEF files from SFL will contain one, two line record.
3) A trailer record of 80 bytes. This record begins with "/*END_IEF", and ends with "*/".
The following is an example of an SFL archive header file in the CEOS_IEF format. The first five lines are required by the file format and will always be as shown except for the date and time of creation in line three. Lines 6 through 20 are specific to SFL, a description of these lines follows the example. Lines 21 through 23 are required by the file format and are dependent upon the image.
| /* | CEOS_IEF | */ |
| /* | SFL | */ |
| /* | yymmddhhMMss | */ |
| /* | NEWACQ | */ |
| /* | 00001 | */ |
| /* | SFL_ARCH_HEAD_START | */ |
| /* | 00439 11 HRPT SFL 01/15/1994 015 21:36:12.216 21:50:42.382 27371 27371 | */ |
| /* | ASC ASC ASC 5 12345 05221 2048 00006 DAY SunZenith +000082.80180 | */ |
| /* | NWest +0060.5080858 -0132.8519702 NNadir +0069.4401448 -0107.0042055 | */ |
| /* | NEast +0071.3446918 -0066.0878714 CWest +0040.6003863 -0107.0628114 | */ |
| /* | CNadir +0045.2336962 -0089.1274721 CEast +0046.6857900 -0069.6915112 | */ |
| /* | SWest +0017.1517659 -0095.6337401 SNadir +0020.0776842 -0081.3560094 | */ |
| /* | SEast +0021.7902854 -0067.0058703 EqCrs -0076.5293148 SatVw 1 | */ |
| /* | Dtime +000000.00000 Dalt +000000.00000 | */ |
| /* | Roll +0.2499999926 +0.0000000000 +0.0000000000 +0.0000000000 +0.0000000000 | */ |
| /* | Pitch +0.0000000000 +0.0000000000 +0.0000000000 +0.0000000000 +0.0000000000 | */ |
| /* | Yaw +0.0000000000 +0.0000000000 +0.0000000000 +0.0000000000 +0.0000000000 | */ |
| /* | EPHEM 195312734464894396829021640000000115719574369446833961627542878940114 | */ |
| /* | GAPS 00006: 00939-00001 01440-00002 01449-00001 02154-00011 03199-00001 | */ |
| /* | 05101-00001 | */ |
| /* | SFL_ARCH_HEAD_END | */ |
| N11AVHHRP 940115 213612 215042 SFLSFL27371A ??????-076.53 012345- 10D C 1 | ||
| +21.79-067.01+17.15-095.63+60.51-132.85+71.34-066.09N? ?????? ???????? 01 | ||
| /* | END_IEF | */ |
| Line | Pos | Type | Description |
|---|---|---|---|
| ---- | --- | ---- | ---------------------------------------- |
| 6 | 1 | 80 chr str | Denotes the start of an SFL archive header |
| 7 | 4 | 5 digit int NBS offset. | This value is divided by 1000 and added to the time stamp codes of the first and last lines in the image. |
| 10 | 2 digit int | Satellite number (9, 10, 11, 12, ...) | |
| 13 | 4 chr str | Data type (GAC, LAC, HRPT) | |
| 18 | 3 chr str | CEOS abbreviation for the receiving station where the image was acquired. | |
| 22 | 8 chr str | Date at the start of acquisition. | |
| 33 | 3 digit int | Julian day at the start of acquisition. | |
| 37 | 12 chr str | Time at the start of acquisition. This is the time stamp code of the first line in the image plus the NBS offset. | |
| 50 | 12 chr str | Time after the last scan line was acquired. This effectively is the time stamp code from next line that the satellite scanned after this image was acquired plus the NBS offset. | |
| 63 | 5 digit int | Orbit number at the start of acquisition. | |
| 69 | 5 digit int | Orbit number at the end of acquisition. | |
| 8 | 4 | 4 chr str | Direction of the pass at the start (ASC, DESC). |
| 9 | 4 chr str | Direction of the pass at the center (ASC, DESC). | |
| 14 | 4 chr str | Direction of the pass at the end (ASC, DESC). | |
| 19 | 1 digit int | Number of bands in the image. | |
| 21 | 5 chr str | Indicates which bands are present. | |
| 27 | 5 digit int | Number of lines in the image. | |
| 33 | 4 digit int | Number of samples in the image. | |
| 38 | 5 digit int | Total number of dropped lines in the image. | |
| 44 | 5 chr str | Indicates day or nighttime data. (DAY, NIGHT). | |
| 60 | 12 digit real | Sun Zenith angle in degrees. | |
| 9 | 11 | 12 digit real | Latitude of the Northwest corner in degrees |
| 25 | 12 digit real | Longitude of the Northwest corner in degrees | |
| 48 | 12 digit real | Latitude of the North nadir point in degrees | |
| 62 | 12 digit real | Longitude of the North nadir point in degrees | |
| 10 | 11 | 12 digit real | Latitude of the Northeast corner in degrees |
| 25 | 12 digit real | Longitude of the Northeast corner in degrees | |
| 48 | 12 digit real | Latitude of the Center West point in degrees | |
| 62 | 12 digit real | Longitude of the Center West point in degrees | |
| 11 | 11 | 12 digit real | Latitude of the Center Nadir point in degrees |
| 25 | 12 digit real | Longitude of the Center Nadir point in degrees | |
| 48 | 12 digit real | Latitude of the Center East point in degrees | |
| 62 | 12 digit real | Longitude of the Center East point in degrees | |
| 12 | 11 | 12 digit real | Latitude of the Southwest corner in degrees |
| 25 | 12 digit real | Longitude of the Southwest corner in degrees | |
| 48 | 12 digit real | Latitude of the South Nadir point in degrees | |
| 62 | 12 digit real | Longitude of the South Nadir point in degrees | |
| 13 | 11 | 12 digit real | Latitude of the Southeast corner in degrees |
| 25 | 12 digit real | Longitude of the Southeast corner in degrees | |
| 48 | 12 digit real | Equatorial crossing in degrees | |
| 70 | 1 digit int | Satellite view flag(1-As received 0-North up) | |
| 14 | 10 | 12 digit real | Delta time correction |
| 29 | 12 digit real | Delta altitude correction | |
| 15 | 10 | 12 digit real | Roll correction coefficents |
| 16 | 10 | 12 digit real | Pitch correction coefficents |
| 17 | 10 | 12 digit real | Yaw correction coefficents |
| 18 | 10 | 69 chr str | Ephemeris information |
| 19 | 9 | 5 digit int | Total number of gaps in the data. If there are no gaps in the data then this line will not be present. |
| 16 | 5 digit int | If there are any data gaps in the image then each data gap will have an entry of the form xxxxx-yyyyy. xxxxx denotes the first line number of the gap and yyyyy denotes the number of lines in the gap. Each entry will be separated from one another with a space. If there are more than 5 data gaps in the image then additional data gap lines will be added to the header. Each additional line will contain from 1 to 6 data gap entries. | |
| 20 | --- additional data gap line --- | ||
| 21 | 1 | 80 chr str | Denotes the end of an SFL archive header |
U.S. Department of the Interior |
U.S. Geological Survey
URL: http://edc2.usgs.gov/1KM/ceosheader.php
Page Contact Information: webmapping@usgs.gov
Page Last Modified: June 23, 2008
