AVNIR CEOS TAPE FORMAT

• Introduction
• D-1 Cassette Specifications
• Logical Volume Structure on D-1 Cassette
  • Volume Descriptor Record Contents
  • File Pointer Record Contents
  • Text Record Contents
  • Common File Descriptor Record Contents
  • Leader File Descriptor Record Contents
  • Scene Header Record Contents
  • Definition of Orientation Angles
  • Map Projection Ancillary Record Contents
  • Radiometric Ancillary Record Contents
  • Ephemeris Ancillary Record Contents
  • Telemetry Ancillary Record Contents
  • Image File Descriptor Record Contents
  • Image Data Record Contents
  • Trailer File Descriptor Record Contents
  • Trailer Record Contents

Introduction

D-1 Cassette Specifications

The total capacity of one of the D-1M cassette is approximately 40 gigabytes, however 5% (~2 gigabytes) of the tape is not used for writing and another 10% (4 gigabytes) is lost utilizing its emulation format mode. Therefore, the total usable capacity of the D-1M cassette is approximately 34 gigabytes.

Logical Volume Structure on D-1 Cassette

Each image product on a D-1 cassette is referred to as a logical volume. The contents of a typical logical volume is illustrated in Figure B-1 through Figure B-2. Note that Figure B-3 and Figure B-4 are merely special cases of the generic layouts as shown in Figure B-1 and Figure B-2 respectively. As is shown, the data files are logically grouped on a tape (D-1 cassette) and the individual cassettes are the physical volumes. Due to the large capacity of a D-1 cassette, a logical volume will always be contained within a single physical volume. Furthermore, a physical volume may contain many logical volumes.

File Record Arrangement for BSQ Format products

File Record Arrangement for BSQ Format products containing output for m bands numbered Band [l] to Band [m], where is 1,2,3 or 3. Note that this layout will be used for normal multispectral and panchromatic products only.

File Record Arrangement for BIL Format products

File Record Arrangement for BIL Format products containing output for m bands numbered Band [l] to Band [m], where m is 1,2,3 or4 Note that this layout will be used for normal multispectral and panchromatic products only.

File Record Arrangement for BSQ Format Mu/Pan HIS Merged products

File Record Arrangement for BSQ Format Mu/Pan HIS Merged products containing output for the 3 merged multispectral band numbered Band [l] to Band [3]. The first Ancellary 4 record, marked with (a) pertains to the Multispectral band, while the second Ancillary 4 record, marked with (b), pertains to the Panchromatic band.

File Record Arrangement for BIL Format Mu/Pan HIS Merged product

File Record Arrangement for BIL Format Mu/Pan HIS Merged products containing outprt for the 3 merged multispectral bands numbered Band [l] to Band [3]. The first Ancillary 4 record, marked with (a), pertains to the Multispectral band, while the second Ancillary 4 record, marked with (b), pertains to the Panchromatic band.

Note that the ordering of per band data is based on a "band list" which is an array of length "m" containing the actual "band numbers" and is denoted by the syntax Band [1], Band [2],...,Band [m]. The product will therefore contain the per band data for the m bands inthe order as specified by this band list.

In the case of a multispectral product, it will have a band list of length 4, containing the band numbers 1,2,3,4. Refer to Figure B-1 and Figure B-2.

In the case of a panchromatic product, it will have a band list of length 1, containing the band number 5. Refer to Figure B-1 and Figure B-2.

In the case of a Mu/Pan HIS merged product, it will have a band list of length 3, containing all the bands specified in the product order, but in ascending band number order. For example, the band list will contain 1, 2, 3, 4 for a product order requiring bands 4, 2 and 1 as red, green and blue colours respecively. Refer to Figure B-3 and Figure B-4.

At the highest level of organization, a logical volume of data written in the standard format may be seen to consist of an introductory file (the volume derectory) and the set of data files (leader, image, and trailer), followed by a terminating file ( the null volume directory file). The null volume directory file consists of a null volume descriptor record only and marks the end of a logical volume. Any subsequent logical volumes of data (2-N on this physical volume) would have their volume directories following the null volume directory file of the preceding logical volume. A description of these files and their component record names is given below. Also, a Volume Label file and a Volume Footer file will be written at the beginning at end of the D-1 cassette. These files give information about the contents of the tape as well as the physical position of the next file to be written to tape. The formats of the Volume Label File and Volume Footer File are specified in the D1 Cassette format specification.

Description of Product Composition

The volume directory file defines the logical and physical construction of the volume. Within the volume directory file, the first record is a volume descriptor record. This is followed by one file pointer record for each data file within the logical volume(3 for BIL and '3*m' for BSQ -- m<4), which is used to define the logical construction of that data file. This is followed by a text record, which serves only as a descriptive record stored in alphanumeric form.

Within each data file, the record is a file descriptor record containing detailed information on how to interpet the contents of its consituent records. In addition, each file has associated with it a file class, to identify the broad category to which the data belongs. Futhermore, within each data record, the first six fields (twelve bytes) are normally used to specify that record's sequence number within the file, some record type coding information, and the length of the record.

Logical Volume Records

1. Volume Descriptor
2. File Pointer
3. Text
4. File Descriptor (Common File, Leader File, Image File, and Trailer File)
5. Scene Header
6. Ancillary (Map Projection, Radiometric, Ephemeris, Telemetry)
7. Image
8. Trailer

1. 'b' indicates that the contents of that particular byte should be filled with a blank space ('b~b' indicates that the rest of a particular field should be filled with blanks).
2. A 'Blank' field corresponds to all 'b' for character fields.
3. For merged products (multispectral and panchromatic), any times relating to scene times shall correspond to the multispectral band.

Record Data Types

Record Type Codes and Record Subtype Codes

Record Content Definitions

Volume Descriptor Record Contents

Clarifications - Volume Descriptor Record

1. Fields #9-11 (Specification and version numbers)
   The values for these fields are specified in system parameter files, and may therefor be configured by the operating agency (NASDA) to any arbitrary values.

2. Field #12 (Software Version Number)
   The values U and W (Version of distortion correction and database version respectively) are derived from values in the Version database table as described in the AAPS External Interface Specification (Document A-1), as follows:
   U = "sum" of AVNIR_H and AVNIR_P;
   W = "sum" of AVNIR_CTRL, AVNIL_CONST, AVNIR_SENSOR and AVNIR CAL.
   For the purposes of adding the alphanumeric characters, the digits '1' to '9' will be mapped to their numeric equrivalents (i.e. the values 1 to 9), and the letters 'A' to 'Z' will be mapped to the values 10 through 35. A single digit resulting "sum" is derived by mapping the result of the following computation onto the characters '1' to 'A' to 'Z' using the above mappings: "som" = (((SUMversions)-1)mod 35) +1

File Pointer Record Contents

Text Record Contents

Field #	Byte #(s)	Data Type	Description (Definition and Value)
1	1-4	B4	Record number BSQ =05|10~14|10 BIL =05|10
2	5	B1	The first Subtype code =022|8
3	6	B1	Record type code =077|8
4	7	B1	The second subtype =022|8
5	8	B1	The third subtype code =022|8
6	9-12	B4	Record Length =360|10
7	13-14	A2	ASCII code character ='Ab'
8	15-16	A2	Blank
9	17-66	A50	Product Type = 'SSSLLNSNNNNSNNNYYDDDCCCb~b'SSS : Sensor type='AVM': Multispectral ='AVP': Panchromatic ='AVC': Mu/Pan HIS Merged LL : Satellite code (='AD') N : Mission number (='1') SNNNN : GRS column number SNNN : GRS line number YY : Preparation year (last two digits) DDD : Preparation dey (in Caesarean calendar) CCC : Processing level = '1Ab', '1B1', and '1B2'
10	67-124	A58	Facility for preparing product and preparation date ='EOC - ADEOSDPSbYYMMDDHHNNSSb~b' YY : Preparation year (last two digits) MM : Month DD : Day HH : Hour NN : Minute SS : Second
11	125-134	A10	Scene ID (scene center time) = 'MDDDDHHNNS' M : Mission number (='1') DDDD : Number of days passed after launching of satellite HH : Observation time (Houra) NN : Observation time (Minute) S : Observation time (in 10's of seconds)
12	135-136	A2	Blank
13	137-140	A4	Blank
14	141-144	A4	Image format (='BDQb' or 'BILb')
15	145-360	A216	Blank

Common File Descriptor Record Contents

Clarifications - Common File Descriptor Record

1. Fiellds #9-11 (Logical volume format manual and reversion numbers) The values for these fields are specified in system parameter files, and may therefore be configured by the operating agency (NASDA) to any arbitrary values.

Leader File Descriptor Record Contents

Scene Header Record Contents

Field #	Byte #(s)	Data Type	Description (Definition and Value)
1	1-4	B4	Record number =2|10
2	5	B1	The first Subtype code =022|8
3	6	B1	Record type code =022|8
4	7	B1	The second subtype code =022|8
5	8	B1	The third subtype code = 011|8
6	9-12	B4	Record Length =4680|10
7	13-16	I4	Header record number =bbb1
8	17-20	A4	Blank
9	21-36	A16	Product ID= 'SSSADISNNNNSNNNb' SSS :Sensor type = 'AVM': Mulispectral ='AVP': Panchromatic ='AVC': Mu/Pan HIS Merged SNNNN: GRS column number SNNN: GRS line number Data for fields #10~#17 are as follows: - Effective for levels 1A and 1B1 only. - For level 1B2: + Field #10,#15,#16 and #17 shall be blank. + Data for fields #11~ #14 shall be b~b0.0bbbbbb
10	37-52	A16	Uncorrected Scene ID= 'LDDDDHHMMSSXXXbb' Using Scene Centre time : L :Mission number (='1') DDDD :Number of days passed after satellite launch HH :Satellite time (Hour) MM :Satellite time (Minute) SS :Satellite time (Second) XXX :Satellite time (Millisecond)
11	53-68	F16.7	Levels 1A and 1B1 scene center latitude (degree)
12	69-84	F16.7	Levels 1A and 1B1 scene center longitude (degree)
13	85-100	F16.7	Line number for levels 1A and 1B1 scene center
14	101-116	F16.7	Pixel number for levels 1A and 1B1 scene center
15	117-148	A32	Scene center time= 'YYYYMMDDHHMMSSXXXb~b' YYYY : Four digits of A.D. year MM : Month DD : Day HH : Hour MM :Minute SS : Second XXX : Millisecond
16	149-164	I16	Time offset from nominal RSP center (millisecond - zero for any time less than a millisecond).
17	165-180	I16	RSP ID = 'MPPPFFFSNb~b' M :Ascending/Descending node ('A' or 'D') PPP :RSP Path number FFF :RSP Frame number SN :RSP Scene shift
18	181-196	I16	Orbits per cycle (=585) Data for fields #19~ #23 are as follows : - Effective for level 1B2 only. - For levels 1A and 1B1: + Field #19 shall be blank, and +All data for fields #20~ #23 shall be =b~b0.0bbbbbb
19	197-212	A16	Level 1B2 scehe (centre) ID = 'LDDDDHHMMSSXXXb~b' L :Mission number (='1') DDDD :Number of days passed after satellite launch HH :Satellite time (Hour) MM :Satellite time (Minute) SS :Satellite time (Second) XXX :Satellite time (Millisecond)
20	213-228	F16.7	Level 1B2 scene center latitude (degree)
21	229-244	F16.7	Level 1B2 scene center longitude (degree)
22	245-260	F16.7	Line number for level 1B2 scene center
23	261-276	F16.7	Pixel number for level 1B2 scene center
24	277-292	F16.1	Orientation Angle = 'b~bNNN.N' NNN.N =degrees (bb0.0~359.9)
25	293-308	A16	Incident Angle at Product Scene Centre = 'SNN.Nb~b' S ='R' or 'L' NN.N =degrees (b0.0~90.0)
26	309-324	A16	Mission ID = 'ADEOS - 1b~b'
27	325-340	A16	Sensor ID = 'AVNIRPb=b' : Panchromatic ='AVNIRMb~b' : Multispectral ='AVNIRCb~b' : Mu/Pan HIS Merged
28	341-356	I16	Calculated orbit number (cummulative - i.e. number of orbits since launch)
29	357-372	A16	Orbit direction = 'Ab~b' or 'Db~b' A : Ascending node D : Descending node
30	373-388	F16.2	Off - Nadir Mirror Pointing Angle = 'b~bSNN.NN' SNN.NN = degrees (-40.00 -b40.00)
31	389	A1	Compression mode ='A' A ='7' : 7- bit 'V' : variable length 'F' : fixed length
32	390-400	A11	Blank
33	401-408	A8	Date image was taken = 'DDMMMYYb' DD : Day (01~31) MMM : Month (Jan ~ Dec) YY : Year (Last two digits)
34	409-425	A17	Latitude and longitude of scene center (degree, minute) = 'CbLDD-MM/WDDD-MMb' L :North latitude ('N') or South latitude ('S') DD,DDD :Degree MM :Minute (Omit any value less than a minute) W :East longitude ('E') or West longitude ('W') - For levels 1A and 1B1 the values for latitude and longitude used in fields #11 and #12, converted into degrees and minutes, are used. - For level 1B2 the values for latitude and longitude used in fields #20 and #21, converted into degrees and minutes, are used.
35	426-442	A17	Latitude and longitude of nominal RSP center for levels 1A and 1B1 (Blank for 1B2) = 'NbLDD-MM/WDDD-MMb' L :North latitude ('N') or South latitude ('S') DD,DDD :Degree MM :Minute W :East longitude ('E') or West longitude ('W')
36	443-452	A10	Kind of sensor and spectrum band identification = 'XXXbBBBBbb' XXX : Sensor type ='AVP' : Panchromatic ='AVM' : Multispectral ='AVC': Mu/Pan HIS Merged BBBB : bands = 'Pbbb' : Panchromatic '1234' : Multispectral 'MMMb': Mu/Pan HIS Merged M= multispectral band numbers as specified by the product order in Red, Green, Blue order
37	453-466	A14	Sun angle at Product Scene Centre = 'SUNbELGGbAHHHb' GG :Elevation of the sun (degree) HHH :Azimuth of the sun (degree - value measured clockwise from north)
38	467-478	A12	Processing code = 'GGP-XXXXXb' GG :Type of correction '1A' :Level 1A 'B1' :Level1B1 'B2' :Level1B2 P :Map projection method : 'b' :Level 1A and 1B1 'S' :Space Oblique Mercator (SOM) 'U' :Universal Transverse Mercator (UTM) 'P' :Polar Stereographic (PS) R :Resampling method : 'B' :Bi-linear 'C' :Cubic convolution 'M' :MTF 'N' :Nearest neighbor 'b' :Uncorrected XXXXX :Processing options (= 'GDIFC'). Options are left justified and reported in the following order : G :Registration to topographic map D :Rough DEM correction I : Image navigation F :Precision correction with GCP's C :Mu/Pan HIS Merged
39	479-490	A12	Identification of competent agent and project = 'NASDAADEOSbb'
40	491-506	A16	Scene ID= 'bE-MDDDD-HHMMS-B' + For levels 1A and 1B1, 'DDDDHHMM' is the same as that for field #10 + For level 1B2, 'DDDDHHMM' is the same as that for field #19 M :Mission number (='1') DDDD :Number of days passed after satellite launch HH :Satellite time (Hour) MM :Satellite time (Minute) S :Satellite time (tens of seconds -omit any seconds less than ten seconds) B :Band number = '1'~ '4' :Multispectral BSQ ='P' :Panchromatic BSQ =blank for BIL
41	507-516	A10	Blank
The following Tick Mark data configuration applies to the next four fields: The first 2 bytes : Position information (B2) Remaining 18 bytes : Character information (A18) Position Information : Up/Down : Pixel number Left/Right : Line number Character Information : Example of latitude and longtude display for UTM and PS map projections : 'EDDD-MMNDDD-MM.MMM' ,- 'NDDD-MMEDDD-MM.MMM' DDD : Degree MM : Minute E : E(ast)/W(est) N : N(orth)/S(outh) Example of distance display for SOM map projection only : 'USLLLLbVSKKKKK.KKK' ,-'VSLLLLbUSKKKKK.KKK' LLLL :Distance (in 10's of km) KKKKK.KKK :Distance (in km) V :map vertical axis U :along track axis (note that for a descending pass, the map vertical points eastward) S :displayed sign (+ or -) Spacing of Tick Marks : For UTM and PS map projections: The latitude spacing shall be 15 minutes For centre latitudes between 0 and +/- 55 degrees: the longitude spacing shall be 15 minutes For centre latitudes between +/- 55 and +/- 73.5 degrees: the longitude spacing shall be 30 minutes For centre latitudes between +/- 73.5 and +/- 81.4 degrees: the longitude spacing shall be 1 minutes For centre latitudes between +/- 81.4 and +/- 85.4 degrees: the longitude spacing shall be 2 minutes For centre latitudes between +/- 81.4 and +/- 87.3 degrees: the longitude spacing shall be 4 minutes For centre latitudes between +/- 87.3 and +/- 88.7 degrees: the longitude spacing shall be 6 minutes For SOM map projections : For all latitudes : the spacing shall be 20km Unused tick mark data Position information: 0 Character Information : 'b' always Tick mark data is effective for level 1B2 only, therefore, for levels 1A and 1B1: Position information :0 Character Information : 'b' always
42	517-816	15(B2/A18)	Upper tick mark data (20 bytes*15data)
43	817-956	7(B2/A18)	Left tick mark data (20 bytes*7data)
44	957-1096	7(B2/A18)	Right tick mark data (20 bytes*7data)
45	1097-1396	15(B2/A18)	Lower tick mark data (20 bytes*15data)
46	1397-1412	A16	Blank
47	1413-1428	I16	Number of effective bands in image = Number of effective bands shown by field #61 (should always be 5)
48	1429-1444	I16	Number of pixels per line in image
49	1445-1460	I16	Number of scene lines in image
50	1461-1476	A16	Blank
51	1477-1492	A16	Blank
52	1493-1508	I16	Radiometric resolution = 'b~b7' or 'b=b8'(bits)
53	1509-1524	A16	Blank
54	1525-1540	A16	Level 1B2 opeion = 'GDIMFb~b' G :Systematic geocoded (north up) to map ptojection. D :Rough teerain correction using DEM of 250 meter mesh (when full scene coverage dem is availabse) I :Correction of attitude fariation using Navigation Imagery obtained in Level 0 Data M :Application of Modulation Transfer Function (MTF) correction to imagery F :Generation of geometrically corrected image (precision corrected) through the use of ground control points C : Multispectral and Panchromatic bands merged to produce combined product.

Definition of Orientation Angles Found in the Scene Header Record and Map Projection Ancillary

Map Projection Ancillary Record Contents

Field #	Byte #(s)	Data Type	Description (Definition and Value)
1	1-4	B4	Record number = 3|10
2	5	B1	The first Subtype code= 044|8
3	6	B1	Record type code =044|8
4	7	B1	The second subtype code =022|8
5	8	B1	The third subtype code =011|8
6	9-12	B4	Record Length =4680|10 Fields #7~#11 are for data related to uncorrected scenes and are, threfor, effective only for processing levels 1A and 1B1. For processing level 1B2 these fields will contain blanks.
7	13-28	I16	Number of nominal pixels per line (5000/10000)
8	29-44	I16	Number of nominal lines per scene (5000/10000)
9	45-60	F16.7	Nominal inter-pixel destance (n) at the scene centre
10	61-76	F16.7	Nominal inter-line destance (m) at the scene centre
11	77-92	F16.7	Image skew (milliradian ) (refer to Figure B-5) Fields #12~#20 are valid for level 1B2 UTM projection products only. Otherwise, these fields will contain blanks.
12	93-96	I4	Hemisphere = . bbb0 : Northern Hemisphere . bbb1 : Southern Hemisphere
13	97-108	I12	UTM zone number for uncorrected image
The latitude and longitude of this GRS centre converted into UTM coordinates.
14	109-124	F16.7	Nominal GRS centre position (Northing -km)
15	125-140	F16.7	Nominal GRS centre position (Easting -km) The latitude and longitude of this scene centre converted into UTM coordinates.
16	141-156	F16.7	Scene centre position (Northing -km)
17	157-172	F16.7	Scene centre position (Easting -km)
18	173-188	F16.7	Vertical offset between the scene center and the nominal GRS center (km). The value is obtained by deducting the value of field #16 from that of field #14.
19	189-204	F16.7	Horizontal offset between the scene center and the nominal GRS center (km). The value is obtained by deducting the value of field #17 from that of field #15.
20	205-220	F16.7	Angle between the map projection vertical axis and the true north at scene centre (radians ) (refer to Figure B-5)
Fields #21~#27 are valid for level 1B2 SOM projection products only. Otherwise, these fields will contain blanks.
The latitude and longitude of the nominal RSP centre converted into SOM coordinates:
21	221-236	F16.7	X coordinates of the nominal RSP center (km)
22	237-252	F16.7	Y coordinates of the nominal RSP center (km)
The latitude and longitude of the scene centre converted into SOM coordinates:
23	253-268	F16.7	X coordinates of the scene center (km)
24	269-284	F16.7	Y coordinates of the scene center (km)
25	285-300	F16.7	Vertical offset between the nominalRSP center and the scene center. The value is obtained by deducting the value of field #24 from #22.
26	301-316	F16.7	Horizonal offset between the nominalRSP center and the scene center. The value is obtained by deducting the value of field #23 from #21.
27	317-332	F16.7	Angle between the map projection vertical axis and the true north (radian). See field #20 for definition (refer to Figure B-5).
Fields #28~#38 are valid for level 1B2 polarstereographic pfojection products only. Otherwise, these fields will contain blanks.
28	333-348	F16.7	Latitude of map projection origin (degree)
29	349-364	F16.7	Longitude of map projection origin (degree)
30	365-380	F16.7	Reference latitude (degree)
31	381-396	F16.7	Reference longitude (degree)
The latitude and longitude of the nominal GRS centre converted into polarstereographic coordinates:
32	397-412	F16.7	X coordinates of the nominal GRS center (km)
33	413-428	F16.7	Y coordinates of the nominal GRS center (km)
The latitude and longitude of the scene centre converted into polarstereographic coordinates:
34	429-444	F16.7	X coordinates of the scene center (km)
35	445-460	F16.7	Y coordinates of the scene center (km)
36	461-476	F16.7	Vertical offset between the nominal GRS center and the scene center. The value is obtained by deducting the value of field #35 from #33.
37	477-492	F16.7	Horizontal offset between the nominal GRS center and the scene center. The value is obtained by deducting the value of field #34 from #32.
38	493-508	F16.7	Angle between the map projection vertical axis and the true north (radian). See field #20 for definition (refer to Figure B-5). Fields #39~#46apply only to corrected scenes and are, therefore,effective only for processing level 1B2. Otherwise, these fields will contain blanks.
39	509-524	F16.7	Number of nominal pixels per line
40	525-540	F16.7	Number of nominal lines per line
41	541-556	F16.7	Nominal output inter-pixel distance
42	557-572	F16.7	Nominal output inter-linedistance
43	573-588	A16	Blank
44	589-604	A16	Blank
45	605-620	A16	Blank
46	621-636	F16.7	Angle between the map projection axis and the true north (radian). See field #20 for definition (refer to Figure B-5).
47	637-652	F16.7	Nominal satellite orbit inclination (degree)
48	653-668	F16.7	Longitude of nominal ascending node on the equator (radian)
49	669-684	F16.7	Nominal satellite altitude (km)
50	685-700	F16.7	Nominal ground speed (km/sec)
51	701-716	F16.7	Effective Scene heading angle at the scene center time measured from True North (radian) (refer to Figure B-5)
52	717-732	F16.7 = 'b~b0.0'
53	732-748	F16.7	Swath angle (nominal - degree= 5.7)
54	749-764	F16.7	Nominal scan rate (scans/sec = 1000/1.2 for Panchromatic and 1000/2.4 for Multispectral)
55	765-780	A16	Name of reference ellipoid
56	781-796	F16.7	Semimajor axis of reference ellipsoid (meters)
57	797-812	F16.7	Semiminor axis of reference ellipsoid (meters)
58	813-828	F16.7	Datum shift referenced to Greenwich :dx (meters)
59	829-844	F16.7	Datum shift referenced to Greenwich :dy (meters)
60	845-860	F16.7	Datum shift referenced to Greenwich :dz (meters)
61	861-876	F16.7	Datum rotational shift: 1(arc- second - 1/3600 degree)
62	877-892	F16.7	Datum rotational shift: 2(arc- second )
63	893-908	F16.7	Datum rotational shift: 3(arc- second )
64	909-924	F16.7	Scale factor of refernce ellipsoid
65	925-956	A32	32-character string to identify geodetic system used with map projections. Blank for AVNIR levels 1A and 1B1
Fields 66 through 73 store the (line, pixel), (latitude, longitude), (X,Y) transformation coefficients : P = P0 + P1I + P2J + P3IJ + P4I2 + P5J2 L = L0 + L1I + L2J +L3IJ +L4I2 +L5J2 I = I0 + I1P + I2L + I3PL + I4P2 + I5L2 J = J0 + J1P + J2L + J3PL + J4P2 + J5L2 Y = Y0 + Y1P + Y2L + Y3PL + Y4P2 + Y5L2 X = X0 + X1P + X2L + X3PL + X4P2 + X5L2 I' = I'0 + I'1P + I'2L + I'3PL + I'4P2 + I'5L2 J' = J'0 + J'1P + J'2L + J'3PL + J'4P2 + J'5L2 where : (I,J), (I',J') are line and pixel of corrected image (P,L) are degrees of latitude and longitude (Y,X) are distance in meters (Y,X) and (I',J')are only valid for level 1B2 products. Storage format =so.NNNNNNNNNNNNNNNND+/-NNN (Note : these formulas are adapted from the SPOT CCT format)
66	957-1100	6(G24.16E3)	Stores six coefficients fromP0 toP5
67	1101-1244	6(G24.16E3)	Stores six coefficients fromL0 toL5
68	1245-1388	6(G24.16E3)	Stores six coefficients from I0 to I5
69	1389-1532	6(G24.16E3)	Stores six coefficients from J0 to J5
70	1533-1676	6(G24.16E3)	Stores six coefficients from Y0 to Y5 (only valid for level 1B2 products and set to blanks for 1A and 1B1 products)
71	1677-1820	6(G24.16E3)	Stores six coefficients from X0 to X5 (only valid for level 1B2 products and set to blanks for 1A and 1B1 products)
72	1821-1964	6(G24.16E3)	Stores six coefficients from I'0 to I'5 (only valid for level 1B2 products and set to blanks for 1A and 1B1 products)
73	1965-2108	6(G24.16E3)	Stores six coefficients from J'0 to J'5 (only valid for level 1B2 products and set to blanks for 1A and 1B1 products)
74	2109-2132	G24, 16E3	Output coordinate rotation angle measured from True North for 1B2 products and set to zero for 1A 1B1 products =0.NNNNNNNNNNNNNNNND+/-NNN (Radians)
75	2133-4680	A2548	Blank

Radiometric Ancillary Record Contents

Field #	Byte #(s)	Data Type	Description (Definition and Value)
1	1-4	B4	Record number =4|10
2	5	B1	The first Subtype code=077|8
3	6	B1	Record type code =044|8
4	7	B1	The second subtype code =022|8
5	8	B1	The third subtype code =011|8
6	9-12	B4	Record Length =4680|10
7	13-16	A4	Sensor Operating Mode
8	17-20	I4	Lower limit of strength after correction ='bbb0'
9	21-24	I4	Upper limit of strength after correction ='b255'
	Exposure Coefficients (fields 10-15) : The values in fields 10-15 provide the normalized exposure coefficient engineering units, which are normally expressed as real values between 0 and 1. The integer values in these fields may be converted to thecorresponding real values by multiplying by 10-4. See also the explanatory notes at the end of this table.
10	25-29	I5	Exposure Coefficient- Multispectral Band 1
11	30-34	I5	Exposure Coefficient- Multispectral Band 2
12	35-39	I5	Exposure Coefficient- Multispectral Band 3
13	40-44	I5	Exposure Coefficient- Multispectral Band 4
14	45-49	I5	Exposure Coefficient- Pan Band
15	50-54	I5	Exposure Coefficient- Navigation Band
16	55	A1	Blank
17	56	A1	Blank
18	57-62	A6	Sensor Gains : Multispectral products: 'XXXXbX' (4 multispectral bands plus navigation band); Panchromatic products: 'bbbbXX' (panchromatic band plus navigation band); HIS merged products: 'XXXXXX' (4 multispectral bands. panchromatic band plus navigation band) where X represents the sensor gain for each band, and can have the values: L = Low Gain N =Normal Gain H = High Gain S = Super Gain
19	63	A1	Compression mode = 'A' A = '7' : 7-bit 'V' : variable length 'F' : fixes length
20	64-66	A3	Blank
21	67-78	A12	The first time of telemetry (Hour : Minute : Second) = 'HH:MM:SS.SSS' (no zero suppression)
22	79-86	F8.3	AVNIR detector temp.1 (‹C--Mu. band 1)
23	87-94	F8.3	AVNIR detector temp.2 (‹C--Mu. band 2)
24	95-102	F8.3	AVNIR detector temp.3 (‹C--Mu. band 3)
25	103-110	F8.3	AVNIR detector temp.4 (‹C--Mu. band 4)
26	111-118	F8.3	AVNIR detector temp.5 (‹C--Mu. band 5)
27	119-126	F8.3	AVNIR detector temp.6 (‹C--Mu. band 6)
28	127-134	F8.3	Multispectral PreAmp/Driver circuit temp.
29	135-142	F8.3	Panchtomatic/Navigation PreAmp/Driver circuit temp.
30	143-150	F8.3	Process Amp temperatrure
31	151-2686	A2536	Blank
32	2687-2694	A8	Blank
33	2695-2702	A8	Blank
	Gain, Offset : Gains and offset below are for conversion from calibrated digital numbers to radiance s: W/m2/sr/[micro]m
34	2703-2718	2F8.4	Band 1 gain, offset
35	2719-2734	2F8.4	Band 2 gain, offset
36	2735-2750	2F8.4	Band 3 gain, offset
37	2751-2766	2F8.4	Band 4 gain, offset
38	2767-2782	2F8.4	Band P gain, offset
39	2783-2798	A16	Blank
40	2799-2814	A16	Blank
41	2815-2830	A16	Blank
42	2831-4680	A1850	Blank

Clarifications - Radiometric Ancillary Record
The exposure coefficients in fields 10-15 are derived from the exposure settings received in the downlinked telemetry data based on Table 5 of the AVNIR Telemetry Definition document (document R-6).

Ephemeris Ancillary Record Contents

Field #	Byte #(s)	Data Type	Description (Definition and Value)
1	1-4	B4	Record number =5|10
2	5	B1	The first Subtype code=366|8
3	6	B1	Record type code =044|8
4	7	B1	The second subtype code =022|8
5	8	B1	The third subtype code =011|8
6	9-12	B4	Record Length =4680|10
7	13-20	A8	Blank
8	21-24	A4	Blank
(Fields #9~#15 are the first orbit data set, unused orbit data set have the time field set to blanks)
9	25-40	A16	Time (UT) of orbit data ='YYMMDDHHNNSSXXXb' YY : Year (last two digits of A.D. year) ('00'~ '99') MM : Month ('01'~ '12') DD : Day ('01'~ '31') HH : Hour ('00'~ '23') NN : Minute ('00'~ '59') SS : Second ('00'~ '59') XXX : Millsecond ('000'~ '999')
10	41-52	F12.5	X component of satellite position in fixed coordinate system of the earth (km) (ECR)
11	53-64	F12.5	Y component of satellite position in fixed coordinate system of the earth (km) (ECR)
12	65-76	F12.5	Z component of satellite position in fixed coordinate system of the earth (km) (ECR)
13	77-88	F12.8	X component of satellite speed in fixed coordinate system of the earth not including earth rotation velocity (km/sec) (X') (ECR)
14	89-100	F12.8	Y component of satellite speed in fixed coordinate system of the earth not including earth rotation velocity (km/sec) (Y') (ECR)
15	101-112	F12.8	Z component of satellite speed in fixed coordinate system of the earth not including earth rotation velocity (km/sec) (Z') (ECR)
16	113-200	See above	The second orbit data sets (repeat of fields above 9 to 15).
17	201-2488	See above	The 3rd orbit data sets (repeat of fields above 9 to 15).
18	2489-3544	See above	The 29th to 40th orbit data sets (these are only required when the "customer geocodeable" productois requested) (repeat of above fields 9 to 15 above)
Fields #19~#22 are the first attitude data set
19	3545-3560	A16	Time (UT) of attitude data = 'YYMMDDHHNNSSXXXb' (See field #9 for description)
20	3561-3568	F8.5	Roll (degrees)
21	3569-3576	F8.5	Pitch (degrees)
22	3577-3584	F8.5	Yaw (degrees)
23	3585-4104	See above	The 2nd to 14th attitude data sets (repeat of above fields 19 to 22).
24	4105-4344	See above	The 15th to 20th attitude data sets (these above are only required when the "customer geocodeable" product is requested) (repeat of above fields 19 to 22).
Fields 25-32 are extracted from the Facility Related Data Record in the level 0 logical volume (refer to Document R-5)
25	4345-4365	A21	Observation start date/time = 'YYYYMMDDbhh:mm:ss.ttt'
26	4366-4386	A21	Observation completion date/time = 'YYYYMMDDbhh:mm:ss.ttt'
27	4387-4391	I5	Time deviation information 1: Cumulative orbit number computed with time deviation
28	4392-4412	A21	Time deviation information 1: Valid data period (start) = 'YYYYMMDDbhh:mm:ss.ttt' (UTC)
29	4413-4433	A21	Time deviation information 1: Valid data period (completion) = 'YYYYMMDDbhh:mm:ss.ttt' (UTC)
30	4434-4446	F13.10	Time deviation information 1: Satellite counter cycles = 'SX.XXXXXXXXXX' (second)
31	4447-4457	A11	Time deviation information 1: Reference satellite time counter = 'NNNNNNNNNNN'
32	4458-4478	A21	Time deviation information 1: Reference satellite time = 'YYYYMMDDbhh:mm:ss.ttt' (UTC) Fields 33-45 are extracted from the Platform Position Record, in the level 0 logical volume, colses to scene centre time (refer to Document R-5)
33	4479-4482	A4	Orbit precesion = 'XXXX' 'OPRD' :Predicted value 'PPED' : Determinid value
34	4483-4485	I3	IERS report information :UTC-TAO seconds = 'sss'
35	4486-4494	F9.5	IERS report information :UTIR-TAO seconds = 'sss.ttttt'
36	4495-4502	F8.4	IERS report information :Polar motion parameter Xpm degree-second
37	4503-4510	F8.4	IERS report information :Polar motion parameter Ypm degree-second
38	4511-4531	A21	Orbit date/time (UT) = 'YYYYMMDDbhh:mm:ss.000'
39	4532-4563	A32	Orbit element coordinates = 'ECIbbbbbbbbbbbbbbbbbbbbbbbbbbbbb'
40	4564-4577	F14.6	Satellite position component x (Km)
41	4578-4591	F14.6	Satellite position component y (Km)
42	4592-4605	F14.6	Satellite position component z (Km)
43	4606-4619	F14.6	Satellite velocity component x' (Km/s)
44	4620-4633	F14.6	Satellite velocity component y' (Km/s)
45	4634-4647	F14.6	Satellite velocity component z' (Km/s)
46	4648-4680	A33	Blank

Telemetry Ancillary Record Contents

Clarification - Telemetry Ancillary Record
The telemetry data reported in this record will be extracted from near the scene center. In the case of Multispectral or Pandhromatic products, only a single telemetry record will be made available. In the case of Mu/Pan HIS Merged products, two telemetry records will be reported, the first from the multispectral image and the second form the panchromatic image.

Image File Descriptor Record Contents

Image Data Record Contents

Trailer File Descriptor Record Contents

Trailer Record Contents