Orbit-by-Orbit

Microwave Derived Products (EDR)

Interface Control Document




Revised 4/30/96
By Vincent Tabor

Revised 10/06/97
By Chris Duda

TABLE OF CONTENTS

1.0    INTRODUCTION

1

    
2.0
    2.1.2    HEADER RECORD DESCRIPTION
4

            
            EDR Product Identification Block
5

            EDR Data Sequence Block
7

            Rev Header Data Description Block
9

            EDR Scan Header Data Description Block
18

            EDR Data Description Block
20

            Rev Header Data Block Format
29

    2.1.2.1     DATA RECORD FORMAT DESCRIPTION

31

            EDR Scan Header Block
33

            EDR Data Block Format
35

3.0    PROGRAMMER NOTE

38

LIST OF ACRONYMS

CEMSC            Central Environmental Satellite Computer System

DACU                Data Acquisition Control Unit

DEF                Data Exchange Format

EDR                Environmental Data Record

FNOC                Fleet Numerical Oceanography Center

HDS                Hitachi Data Systems

IDB                Intermediate Data Base

NESDIS            National Environmental Satellite, Data and Information Service

REV                Revolution

SSM/I                Special Sensor Microwave Imagery

1.0    INTRODUCTION
EDR data sets are formatted into the Shared Processing Data Exchange Format (DEF) at FNOC. They are transmitted to NESDIS via communication satellite, and given a data set name to identify it on the NESDIS Computer (CEMSCS). There are approximately 14 orbits acquired during a 24 hour period. Data for at least a 24 hour period but no more than a 48 hour period should be resident on the CEMSCS direct access storage devices at any given time. EDR data for four of the DMSP satellites [DMSP F-10(S4), F-11(S5), F-13(S-7), and F- 14(S-8)] is currently being keep on the CEMSCS.

Previous versions of the EDR documentation which refer to the Intermediate Database (IDB) should be amended. NESDIS no longer uses the IDB for processing or orbital occess. Rather, all DMSP EDR orbits are made available on the CEMSCS as 1300 length records. These orbital datasets may be accessed directly by users.

The basic format of the EDR dataset is one EDR Output Header Record followed by a series of records which each contain one scanline of data. Section 2.1.1 describes the format of the EDR Output Header Record, record #1. Section 2.1.2 describes the format of the scanline data, records #2-EOF.


2.1. 2    HEADER RECORD DESCRIPTION

The EDR Output Header Record contains six description blocks which are defined in terms of words consisting of a combination of 32-bits, 16-bits, and 8-bits.

Description Blocks

1.    EDR IDENTIFICATION BLOCK
2.    EDR DATA SEQUENCE BLOCK
3.    REV HEADER DATA DESCRIPTION BLOCK
4.    EDR SCAN HEADER DATA DESCRIPTION BLOCK
5.    EDR DATA DESCRIPTION BLOCK
6.    REV HEADER DATA BLOCK FORMAT

EDR Product Identification Block


Data Word  


Type  


Contents  


Comments  
1  
I*2  
Block Length  
Length of Block in Terms of I*2 Words (14)  
2  
Byte  
MODE  
Binary 8-bit Number (1)  
3  
Byte  
SUBMODE  
Binary 8-bit Number (1)  
4  
C*4  
Originator ID  
Four Character (FNOC)  
5  
C*1  
Classification  
One Character (U)  
6  
Byte  
File Lifetime  
Binary 8-bit Number (255)  
7  
C*10  
Product Identifier  
10 Characters TSMIEDR 10  
8  
I*2  
Year  
Binary Number  
9  
Byte  
Month  
Binary 8-bit Number  
10  
Byte  
Day  
Binary 8-bit Number  
11  
Byte  
Hour  
Binary 8-bit Number  
12  
Byte  
Minute  
Binary 8-bit Number  
13  
I*2  
Checksum  
Binary Number

 

EDR PRODUCT IDENTIFICATION BLOCK

BYTES
0-1   BLOCK LENGTH

14  

 
2-3   MODE

1  

SUBMODE

1  

 
4-5   CHAR. 1

F  

CHAR. 2

N  

 
6-7   CHAR. 3

O  

CHAR. 4

C  

ORIGINATOR
ID  
8-9   CLASSIFICATION

U  

FILE LIFETIME

255  

 
10-11   FILE INDICATOR

T  

CHAR. 2

S  

 
12-13   CHAR. 3

M  

CHAR. 4

I  

 
14-15   CHAR. 5

E  

CHAR. 6

D  

PRODUCT
IDENTIFIER  
16-17   CHAR. 7

R  

CHAR. 8    
18-19   CHAR. 9   CHAR. 10

8  

 
20-21   YEAR

(SET BY SMIDEF)  

 
22-23   MONTH

(SET BY SMIDEF)  

DAY

(SET BY SMIDEF)  

 
24-25   HOUR

(SET IN SMIDEF)  

MINUTE

(SET IN SMIDEF)  

 
26-27   CHECKSUM

(CAL. IN SMIDEF)
 

 



EDR Data Sequence Block

Data Word  
Type  
Contents  
Comments  
1   I*2   Block length   Length of block in term of I*2 Words (13)  
2   Byte   MODE   Binary 8-bit Number (3)  
3   Byte   SUBMODE   Binary 8-bit Number (19)  
4   I*2   Number of Loops   Three  
5   Byte   Start Number   Binary 8-bit Number  
6   Byte   Loop Number   Binary 8-bit Number (1)  
7   I*2   Number of Data Blocks   Binary 16-bit Number (1)  
8   Byte   End Number   Binary 8-bit Number  
9   Byte   Loop Number   Binary 8-bit Number  
10   Byte   Start Number   Binary 8-bit Number  
11   Byte   Loop Number   Binary 8-bit Number (2)  
12   I*2   Number of Data Blocks   HDR Data Block (3)  
13   Byte   Start Number   Binary 8-bit Number  
14   Byte   Loop Number   Binary 8-bit Number (3)  
15   I*2   Number of Data Blocks   Binary 16-bit Number (1)  
16   Byte   END Number   Binary 8-bit Number  
17   Byte   Loop Number   Binary 8-bit Number (3)  
18   Byte   End Number   Binary 8-bit Number  
19   Byte   Loop Number   Binary 8-bit Number (2)  
20   I*2   Checksum   Calc in SMIDEF  

EDR DATA SEQUENCE BLOCK

BYTES
0-1   BLOCK LENGTH

13  

 
2-3   MODE

3  

SUBMODE

19  

 
4-5   NUMBER OF LOOPS

3  

 
6-7   START

{  

LOOP NUMBER

1  

REV HEADER
BLOCK  
8-9   NUMBER
OF DATA BLOCKS

1  

 
10-11   END

}  

LOOP NUMBER

1  

 
12-13   START

{  

LOOP NUMBER

2  

 
14-15   NUMBER
OF DATA BLOCKS

(SET IN SMIDEF)  

 
16-17   START

{  

LOOP NUMBER

3  

HDR DATA
BLOCK  
18-19   NUMBER OF DATA BLOCKS

1  

 
20-21   END

}  

LOOP NUMBER

3  

 
22-23   END

}  

LOOP NUMBER

2  

 
24-25   CHECKSUM
(CALC. IN SMIDEF)   		 

Rev Header Data Description Block

Data Word
Type
Contents
Comments
1   I*2   Block length   Length of Block in Terms of I*2 Words (95)  
2   Byte   Mode   Binary 8-bit Number (3)  
3   Byte   Submode   Binary 8-bit Number (17)  
4   Byte   Number Elements   Binary 8-bit Number (15)  
5   Byte   Bytes/Section   Binary 8-bit Number (24)  
6   I*2   Number of Sections   Binary Number (1)  
7   C*4   Spacecraft ID   Character String "SCID"  
8   Byte   Start Byte   Binary 8-bit Number (4)  
9   Byte   Bytes/Element   Binary 8-bit Number (4)  
10   I*2   Units Code   Combination of a Zero Filled Byte and Unit Code (19)  
11   Byte   Mult. Mantissa   Binary 8-bit Number (1)  
12   Byte   Exponent   Binary 8-bit Number (0)  
13   I*2   Additive Constant   Binary Number (0)  
14   C*4   Rev/Orbit Number   Character String "REV#"  
15   Byte   Start Byte   Binary 8-bit Number (8)  
16   Byte   Bytes/Element   Binary 8-bit Number (4)  
17   I*2   Units Code   Combination of a Zero Filled Byte and Unit Code (19)  
18   Byte   Mult. Mantissa   Binary 8-bit Number (1)  
19   Byte   Exponent   Binary 8-bit Number (0)  
20   I*2   Additive Constant   Binary Number  
21   C*4   Julian Day Data Begins   Character String "BJLD"  
22   Byte   Start Byte   Binary 8-bit Number (12)  
23   Byte   Bytes/Element   Binary 8-bit Number (2)

 

24   I*2   Units Code   Combination of a Zero Filled Byte and Unit Code (51)  
25   Byte   Mult. Mantissa   Binary 8-bit Number (1)  
26   Byte   Exponent   Binary 8-bit Number (0)  
27   I*2   Additive Constant   Binary Number (0)  
28   C*4   Hour of Day Data Begins   Character String "BHR"  
29   Byte   Start Byte   Binary 8-bit Number (14)  
30   Byte   Bytes/Element   Binary 8-bit Number (1)  
31   I*2   Units Code   Combination of a Zero Filled Byte and Unit Code (50)  
32   Byte   Mult. Mantissa   Binary 8-bit Number (1)  
33   Byte   Exponent   Binary 8-bit Number (0)  
34   I*2   Additive Constant   Binary Number (0)  
35   C*4   Minute of Hour Data   Character String "BMN"
 
36   Byte   Start Byte   Binary 8-bit Number (15)  
37   Byte   Bytes/Element   Binary 8-bit Number (1)  
38   I*2   Units Code   Combination of a Zero Filled Byte and Unit Code (49)  
39   Byte   Mult. Mantissa   Binary 8-bit Number (1)  
40   Byte   Exponent   Binary 8-Bit Number (0)  
41   I*2   Additive Constant   Binary Number (0)  
42   C*4   Second of Min. Data Begins   Character String "BSEC"  
43   Byte   Start Byte   Binary 8-Bit Number (16)  
44   Byte   Bytes/Element   Binary 8-Bit Number (1)  
45   I*2   Units Code   Combination of a Zero Filled Byte and Unit Code (12)  
46   Byte   Mult. Mantissa   Binary 8-Bit Number (1)  
47   Byte   Exponent   Binary 8-Bit Number (0)  
48   I*2   Additive Constant   Binary Number (0)
 
49   C*4   Julian Day Data Ends   Character String "EJLD"  
50   Byte   Start Byte   Binary 8-Bit Number (17)  
51   Byte   Bytes/Element   Binary 8-Bit Number (2)  
52   I*2   Units Code   Combination of a Zero Filled Byte and Unit Code (51)  
53   Byte   Mult. Mantissa   Binary 8-Bit Number (1)  
54   Byte   Exponent   Binary 8-Bit Number (0)  
55   I*2   Additive Constant   Binary Number (0)  
56   C*4   Hour of Day Data Ends   Character String "EHR"  
57   Byte   Start Byte   Binary 8-Bit Number (19)  
58   Byte   Bytes/Element   Binary 8-Bit Number (1)  
59   I*2   Units Code   Combination of a Zero Filled Byte and Unit Code (50)  
60   Byte   Mult. Mantissa   Binary 8-Bit Number (1)  
61   Byte   Exponent   Binary 8-Bit Number (0)  
62   I*2   Additive Constant   Binary Number (0)  
63   C*4   Minute of Hour Data Ends   Character String "EMN"  
64   Byte   Start Byte   Binary 8-Bit Number (20)  
65   Byte   Bytes/Element   Binary 8-Bit Number (1)  
66   I*2   Units Code   Combination of a Zero Filled Byte and Unit Code (49)  
67   Byte   Mult. Mantissa   Binary 8-Bit Number (1)  
68   Byte   Exponent   Binary 8-Bit Number (0)  
69   I*2   Additive Constant   Binary Number (0)  
70   C*4   Second of Minute Data Ends   Character String "ESEC"  
71   Byte   Start Byte   Binary 8-Bit Number (21)
 
72   Byte   Bytes/Element   Binary 8-Bit Number (1)  
73   I*2   Units Code   Combination of a Zero Filled Byte and Unit Code (12)  
74   Byte   Mult. Mantissa   Binary 8-Bit Number (1)  
75   Byte   Exponent   Binary 8-Bit Number (0)  
76   I*2   Additive Constant   Binary Number (0)  
77   C*4   Day of Ascending Node   Character String "AJLD"  
78   Byte   Start Byte   Binary 8-Bit Number (22)  
79   Byte   Bytes/Element   Binary 8-Bit Number (2)  
80   I*2   Units Code   Combination of a Zero Filled Byte and Unit Code (51)  
81   Byte   Mult. Mantissa   Binary 8-Bit Number (1)  
82   Byte   Exponent   Binary 8-Bit Number (0)  
83   I*2   Additive Constant   Binary Number (0)  
84   C*4   Hour of Ascending Node   Character String "AHR"  
85   Byte   Start Byte   Binary 8-Bit Number (24)  
86   Byte   Bytes/Element   Binary 8-Bit Number (1)  
87   I*2   Units Code   Combination of a Zero Filled Byte and Unit Code (50)  
88   Byte   Mult. Mantissa   Binary 8-Bit Number (1)  
89   Byte   Exponent   Binary 8-Bit Number (0)  
90   I*2   Additive Constant   Binary Number (0)  
91   C*4   Minute of Ascending AMN (blank)   Character String Node  
92   Byte   Start Byte   Binary 8-Bit Number (25)  
93   Byte   Bytes/Element   Binary 8-Bit Number (1)  
94   I*2   Units Code   Combination of a Zero Filled Byte and Unit Code (49)  
95   Byte   Mult. Mantissa   Binary 8-Bit Number (1)
 
96   Byte   Exponent   Binary 8-Bit Number (0)  
97   I*2   Additive Constant   Binary Number (0)  
98   C*4   Second of Ascending Node   Character string "ASEC"  
99   Byte   Start Byte   Binary 8-Bit Number (26)  
100   Byte   Bytes/Element   Binary 8-Bit Number (1)  
101   I*2   Units Code   Combination of a Zero Filled Byte and Unit Code (12)  
102   Byte   Mult. Mantissa   Binary 8-Bit Number (1)  
103   Byte   Exponent   Binary 8-Bit Number (0)  
104   I*2   Additive Constant   Binary Number (0)  
105   C*4   Logical Satellite   Character String "LSI"  
106   Byte   Start Byte   Binary 8-Bit Number (27)  
107   Byte   Bytes/Element   Binary 8-Bit Number (1)  
108   I*2   Units Code   Combination of a Zero Filled Byte and Units Code (19)  
109   Byte   Mult. Mantissa   Binary 8-Bit Number (1)  
110   Byte   Exponent   Binary 8-Bit Number (0)  
111   I*2   Additive Constant   Binary Number (0)  
112   I*2   CheckSum   Binary Number  



BYTES                            BYTES
0-1   BLOCK LENGTH

95  

  30-31   ADDITIVE CONSTANT

0  

 
2-3   MODE
3   		SUBMODE 17     32-33   CHAR. 1
B   		CHAR. 2
J   		JULIAN DAY DATA BEGINS  
4-5   NUMBER
ELEMENTS
15   		BYTES/
SECTION
24   		  34-35   CHAR. 3

L  

CHAR. 4

D  

 
6-7   NUMBER OF SECTIONS

1  

  36-37   START
BYTE
12   		BYTES/
ELEMENTS
2   		 
8-9   CHAR. 1

S  

CHAR. 2

C  

SPACECRAFT ID   38-39   UNUSED

0  

UNITS
CODE
51   		 
10-11   CHAR. 3

I  

CHAR. 4

D  

  40-41   MULT.
MANTISSA
1   		EXPONENT

0  

 
12-13   START
BYTE
4   		BYTES/
ELEMENT S
4   		  42-43   ADDITIVE
CONSTANT
0   		 
14-15   UNUSED

0  

UNITS
CODE
19   		  44-45   CHAR. 1

B  

CHAR. 2

H  

HOUR OF DAY
DATA BEGINS  
16-17   MULT.
MANTISSA
1   		EXPONEN T

0  

  46-47   CHAR. 3

R  

CHAR. 4    
18-19   ADDITIVE
CONSTANT
0   		  48-49   START
BYTE
14   		BYTES/
ELEMENT
1   		 
20-21   CHAR. 1

R  

CHAR. 2

E  

REV/ORBIT
NUMBER   		50-51   UNUSED

0  

UNITS
CODE
50   		 
22-23   CHAR. 3

V  

CHAR. 4

#  

  52-53   MULT.
MANTISSA
1   		EXPONENT

0  

 
24-25   START
BYTE
8   		BYTES/
ELEMENT
4   		  54-55   ADDITIVE
CONSTANT
0   		 
26-27   UNUSED

0  

UNITS
CODE
19   		  56-57   CHAR. 1

B  

CHAR. 2

M  

MINUTE OF HOUR
DATA BEGINS  

28-29   		MULT.
MANTISSA
1   		EXPONEN T

0  

  58-59   CHAR. 3

N  

CHAR. 4    


BYTES                            BYTES
60-61   START
BYTE
15   		BYTES/
ELEMENT
1   		  90-91   ADDITIVE
CONSTANT

0  

 
62-63   UNUSED
0   		UNITS
CODE
49   		  92-93   CHAR. 1

E  

CHAR. 2

H  

HOUR OF DAY DATA BEGINS  
64-65   MULT.
MANTISSA
1   		EXPONENT

0  

  94-95   CHAR. 3

R  

CHAR. 4

 

 
66-67   ADDITIVE
CONSTANT
0   		  96-97   START
BYTE
19   		BYTES/
ELEMENTS
1   		 
68-69   CHAR. 1

B  

CHAR. 2

S  

SECOND OF MIN.
DATA BEGINS   		98-99   UNUSED

0  

UNITS
CODE
50   		 
70-71   CHAR. 3

E  

CHAR. 4

C  

  100-101   MULT.
MANTISSA
1   		EXPONENT

0  

 
72-73   START
BYTE
16   		BYTES/
ELEMENTS
1   		  102-103   ADDITIVE
CONSTANT
0   		 
74-75   UNUSED

0  

UNITS
CODE
12   		  104-105   CHAR. 1

B  

CHAR. 2

H  

HOUR OF DAY
DATA BEGINS  
76-77   MULT.
MANTISSA
1   		EXPONENT

0  

  106-107   CHAR. 3

N  

CHAR. 4    
78-79   ADDITIVE
CONSTANT
0   		  108-109   START
BYTE
20   		BYTES/
ELEMENT
1   		 
80-81   CHAR. 1

E  

CHAR. 2

J  

JULIAN DAY DATA BEGINS   110-111   UNUSED

0  

UNITS
CODE
49   		 
82-83   CHAR. 3

L  

CHAR. 4

D  

  112-113   MULT.
MANTISSA
1   		EXPONENT

0  

 
84-85   START
BYTE
17   		BYTES/
ELEMENT
2   		  114-115   ADDITIVE
CONSTANT
0   		 
86-87   UNUSED

0  

UNITS
CODE
51   		  116-117   CHAR. 1

E  

CHAR. 2

S  

SECOND OF MINUTE DATA ENDS  
88-89   MULT.
MANTISSA
1   		EXPONENT

0  

  118-119   CHAR. 3

E  

CHAR. 4

C  

 



BYTES                            BYTES
120-121   START
BYTE
21   		BYTES/
ELEMENT
1   		  150-151   ADDITIVE
CONSTANT

0  

 
122-123   UNUSED
0   		UNITS
CODE
12   		  152-153   CHAR. 1

A  

CHAR. 2

M  

MINUTE OF ASCENDING NODE  
124-125   MULT.
MANTISSA
1   		EXPONENT

0  

  154-155   CHAR. 3

N  

CHAR. 4

 

 
126-127   ADDITIVE
CONSTANT
0   		  156-157   START
BYTE
25   		BYTES/
ELEMENTS
1   		 
128-129   CHAR. 1

A  

CHAR. 2

J  

DAY OF ASCENDING NODE   158-159   UNUSED

0  

UNITS
CODE
49   		 
130-131   CHAR. 3

L  

CHAR. 4

D  

  160-161   MULT.
MANTISSA
1   		EXPONENT

0  

 
132-133   START
BYTE
22   		BYTES/
ELEMENTS
2   		  162-163   ADDITIVE
CONSTANT
0   		 
134-135   UNUSED

0  

UNITS
CODE
51   		  164-165   CHAR. 1

A  

CHAR. 2

S  

SECOND OF ASCENDING NODE  
136-137   MULT.
MANTISSA
1   		EXPONENT

0  

  166-167   CHAR. 3

E  

CHAR. 4

C  

 
138-139   ADDITIVE
CONSTANT
0   		  168-169   START
BYTE
26   		BYTES/
ELEMENT
1   		 
140-141   CHAR. 1

A  

CHAR. 2

H  

HOUR OF ASCENDING NODE   170-171   UNUSED

0  

UNITS
CODE
12   		 
142-143   CHAR. 3

R  

CHAR. 4

 

  172-173   MULT.
MANTISSA
1   		EXPONENT

0  

 
144-145   START
BYTE
24   		BYTES/
ELEMENT
1   		  174-175   ADDITIVE
CONSTANT
0   		 
146-147   UNUSED

0  

UNITS
CODE
50   		  176-177   CHAR. 1

L  

CHAR. 2

S  

LOGICAL SATELLITE ID  
148-149   MULT.
MANTISSA
1   		EXPONENT

0  

  178-179   CHAR. 3

I  

CHAR. 4

 

 
Rev Header Data Description Block (continued)

BYTES
180-181   START
BYTE
27   		BYTES/
ELEMENT
1  
182-183   UNUSED

0  

UNITS
CODE
19  
184-185   MULT.
MANTISSA
1   		EXPONENT

0  

186-187   ADDITIVE
CONSTANT
0  
188-189   CHECKSUM

(CALC. IN SMIDEF)  



EDR Scan Header Data Description Block

Data Word
Type
Contents
Comments
1   I*2   Block length   Length of block in term of I*2 words (17)  
2   Byte   MODE   Binary 8-bit Number (3)  
3   Byte   SUBMODE   Binary 8-bit Number (17)  
4   Byte   Number of Elements   Binary 8-bit Number (2)  
5   Byte   Bytes per Section   Binary 8-bit Number (6)  
6   I*2   Number of Sections   Binary Number (1)  
7   C*4   Counter   Character String "CNTR"  
8   Byte   Start Byte   Binary 8-bit Number (4)  
9   Byte   Bytes/Element   Binary 8-bit Number (2)  
10   I*2   Unit Code   Combination of a Zero Filled Byte and the Unit Code (19)  
11   Byte   Mult. Mantissa   Binary 8-bit Number (1)  
12   Byte   Exponent   Binary 8-bit Number (0)  
13   I*2   Additive Constant   Binary Number  
14   C*4   Bscan Start Time   Character String "BSTM"  
15   Byte   Start Byte   Binary 8-bit Number (6)  
16   Byte   Bytes/Element   Binary 8-bit Number (4)  
17   I*2   Units Code   Combination of a Zero Filled Byte and the Unit Code (12)  
18   Byte   Mult. Mantissa   Binary 8-bit Number (1)  
19   Byte   Exponent   Binary 8-bit Number (0)  
20   I*2   Additive Constant   Binary Number  
21   I*2   Checksum   Calculated in "SMIDEF"  


EDR SCAN HEADER DATA DESCRIPTION BLOCK

BYTES                            BYTES
0-1   BLOCK LENGTH

17  


 

30-31   ADDITIVE
CONSTANT
0   		 
2-3   MODE

3  

SUBMODE

17  

  32-33   CHECKSUM

(CAL. IN SMIDEF)  

 
4-5   NUMBER
ELEMENT S
2   		BYTES/
SECTION
6   		         
6-7   NUMBER OF SECTIONS
1   		         
8-9   CHAR. 1

C  

CHAR. 2

N  

COUNTER          
10-11   CHAR. 3

T  

CHAR. 4

R  

         
12-13   START
BYTE
4   		BYTES/
ELEMENTS
2   		       
14-15   UNUSED

0  

UNITS
CODE
19   		         
16-17   MULT.
MANTISSA
1   		EXPONENT

0  

         
18-19   ADDITIVE
CONSTANT
0   		         
20-21   CHAR. 1

B  

CHAR. 2

S  

B-SCAN
START TIME   		       
22-23   CHAR. 3

T  

CHAR. 4

M  

         
24-25   START
BYTE

6  

BYTES/
ELEMENT

4  

       
26-27   UNUSED

0  

UNITS
CODE
12   		         
28-29   MULT.
MANTISSA
1   		EXPONENT

0  

         


EDR Data Description Block

Data Word
Type
Contents
Comments
1   I*2   Block length   Length of Block in Terms of I*2 Words (107)  
2   Byte   Mode   Binary 8-Bit Number (3)  
3   Byte   Submode   Binary 8-Bit Number (17)  
4   Byte   Number Elements   Binary 8-Bit Number (17)  
5   Byte   Bytes/Selection   Binary 8-Bit Number (20)  
6   I*2   Number of Sections   Binary Number (62)  
7   C*4   Counter   Character String "CNTR"  
8   Byte   Start Byte   Binary 8-Bit Number (4)  
9   Byte   Bytes/Element   Binary 8-Bit Number (2)  
10   I*2   Units Code   Combination of a Zero Filled Byte and Unit Code (19)  
11   Byte   Mult. Mantissa   Binary 8-Bit Number (1)  
12   Byte   Exponent   Binary 8-Bit Number (0)  
13   I*2   Additive Constant   Binary Number (0)  
14   C*4   Latitude   Character String "LAT"  
15   Byte   Start Byte   Binary 8-Bit Number (6)  
16   Byte   Bytes/Element   Binary 8-Bit Number (2)  
17   I*2   Units Code   Combination of a Zero Filled Byte and Unit Code (45)  
18   Byte   Mult. Mantissa   Binary 8-Bit Number (1)  
19   Byte   Ex