Redbook Format

Redbook format is broken into general purpose blocks. Each block is defined as follows:

Halfword	Content		Description
0	LCllllllllll...		L - length flag - 0 if length included C - Checksum flag - 0 if checksum included llll... - length field - 14 bit length in halfwords (2 bytes)
1	mode	submode	Mode and submode values that define block type
2-nnn			Data
nnn	Checksum

These blocks are repeated until end of product

1. Product Data

1.1 Product Identification Block (mode 1, submode 1)

Halfword	Content		Description
1	1	1	Mode and submode
2	C1	C2	Originator identification (4 characters)
3	C3	C4
4	Classification	Retention time	Classification - U - unclassified C - confidential S - secret T - top secret E - encrypted Retention time - default time in days to retain product
5	File indicator	C2	File indicator determines originating agency
6	C3	C4	Product identifier C2-C10 - used to determine type of data
7	C5	C6
8	C7	C8
9	C9	C10
10	Year
11	Month	Day
12	Hour	Minute
13	C11	C12	Additional product identifier
14	C13	C14
15	C15	C16

1.2 End of Product Block (mode 1, submode 2)

Halfword	Content		Description
1	1	2	Mode and submode

1.4 Plot Parameters Block (mode 1, submode 4)

This defines various plotting parameters. Not all parameters need to be specified.

Halfword	Content		Description
1	1	4	Mode and submode
2	Z threshold	zoom factor	Z - zoom disable: 0 - data are sized according to zoom 1 - data are displayed invariant of zoom threshold - minimum zoom factor needed to display data 0 - display at all zoom levels 1 - display only at 1X or higher magnifications factor - optional zoom factor applied to strings at local level
3	plot color	background color	Color index values
4	line char	line width	line char: 0 - continuous 1 - dotted 2 - short dashed 3 - long dashed 4 - dotted (every 4th pixel) 5 - symbolic line line width - width of line in pixels
5	C1	C2	Line mneumonic (4 characters)
6	C3	C4
7	logical fill	fill pattern	logical fill - Flag indicating whether fill is to be done on the "L" left or "R" of vector string fill pattern - A preassigned pattern number

2. Systems Data

These are user defined fields.

3. Formatted Binary Data

4. Vector Graphics Data

These blocks are used with vector graphics plots.

4.16 Vector Graphics Definition Block (mode 4, submode 16)

Halfword	Content		Description
1	4	16	Mode and submode values
2	PI set	coord flag	PI - projection indicator - defines the background projection coord flag: 0 - M=latitude, N=longitude 1 - M=I, N=J, Cartesian coordinates 2 - M=X, N=Y, Pixel coordinates
3	area code	label code	area code - defines the reference points label code: 0 - label codes are non-standard and will be sent in alphanumeric block 1 - standard user define label
4	M1		First reference coordinate (M,N), defined by area code
5	N1
6	M2		Second reference coordinate (M,N)
7	N2
8	M3		Third reference coordinate (M,N)
9	N3
10	Month	Day	Valid Time
11	Hour	Minute
12	Month	Day	End of valid period
13	Hour	Minute

Projection Indicators:

The projection is a grid that is defined by a scale (distance between gridpoints) and a lower left corner position (X0,Y0).

PI	Description	Projection	LongX	Scale	X0	Y0
21	Northern Hemisphere	Polar Stereographic	105W	.0508	-61.5	-83.7
22	North America	Polar Stereographic	105W	.1016	-103	-86

Area Codes:

11 - One reference point is used to define the upper left corner of the product
12 - One reference point is used to define the lower left corner of the product
13 - One reference point is used to define the center of the product
21 - Two reference points are used to define the upper left and upper right corners of the product
22 - Two reference points are used to define the lower left and upper right corners of the product
23 - Two reference points are used to define the upper left and center of the product
24 - Two reference points are used. The first reference point gives the coordinates of the lower left corner of the product in units of the grid from which it was extracted. The second set of reference coordinates will give the maximum horizontal and maximum vertical size of the product in pixels.
25 - Same as 25 except the reference point is located at the center of the product.
33 - Three reference points are used to define the upper left, upper right, and lower right corners of the product.

4.1 Absolute Vectors Block (mode 4, submode 1)

Halfword	Content		Description
1	4	1	Mode and submode values
2	M0		First coordinate (M,N) of the line
3	N0
4	B M1		B - beam flag: 0 - pen up, new line starts 1 - pen down, line drawn to previous point Second coordinate (M,N)
5	N1
6-nnn	Mx,Nx		Successive coordinates

4.2 Relative Vectors Block (mode 4, submode 2)

Halfword	Content		Description
1	4	2	Mode and submode values
2	M0		First coordinate (M,N) of the line
3	N0
4	dM1	dN1	Delta M,N values. Successive values are added to previous values. The delta values are in two's complement.
5-nnn	dMx	dNx	Successive delta values.

4.5 Long/Short Relative Vectors Block (mode 4, submode 5)

This is similar to the relative vector block except that it allows deltas to be either a long or short value. The long deltas are 2 halfwords and the short deltas are 1 halfword.

Halfword	Content		Description
1	4	5	Mode and submode values
2	M0		First coordinate (M,N) of the line
3	N0
4	1 dM1	B dN1	1 - denotes short delta values. dM1 - 7 bit delta M (two's complement). B - beam mode: 0 - pen up, new line, 1 - pen down draw from previous point dN1 - 7 bit delta N (two's complement) Delta M,N values. Successive values are added to previous values. The delta values are in two's complement.
4	0xx dM1		0xx - denotes long delta values. dM1 - 15 bit delta M (two's complement)
5	0xB dN1		B - beam mode: 0 - pen up, new line, 1 - pen down draw from previous point dN1 - 15 bit delta M (two's complement)
5-nnn			Successive delta values.

4.10 Curve Vectors Block (mode 4, submode 10)

This specifies a list of point to which a smooth curve is to be fitted. There is a minimum of three points.

Halfword	Content		Description
1	4	10	Mode and submode values
2	M0		First coordinate (M,N) of the line
3	N0
4	B M1		B - beam flag: 0 - pen up, new line starts 1 - pen down, line drawn to previous point Second coordinate (M,N)
5	N1
6	B M2		Third coordinate (M,N)
7	N2
8-nnn	Mx,Nx		Successive coordinates

5. Alphanumeric Data

5.16 Alpanumeric Product Definition Block (mode 5, submode 16)

Halfword	Content		Description
1	5	16	Mode and submode values
2-nnn	C1	C2	Character data. Number of characters defined by block length.

5.1 Alphanumeric Character Block (mode 5, submode 1)

Halfword	Content		Description
1	5	1	Mode and submode values
2	M		Position (M,N) of the string
3	N
4	dM	dN	Delta M,N values identify offset from position for the first character in the string. This is fixed regardless of zoom factor.
5	B R size	C1	B - Block mode: 0 - display normally (except with R=1) 1 - rectangular block is cleared prior to plotting text. R - Reverse mode: 0 - normal display 1 - reverse mode size - Character size factor in display units: 0 = standard size, 1 = 5x7, 2 = 10x14, 3 = 15x21, etc. C1 - Start of character data.
6-nnn	C2	C3	Additional character data. Number of characters defined by block length.

5.2 Plot Data Block (mode 5, submode 2)

The plot data block plots data based on a process code. This can define strings or symbols to be plotted. In the case of symbols, the process code defines the number of characters needed to define the symbol. More than one can be plotted.

Halfword	Content		Description
1	5	2	Mode and submode values
2	B R size	code	B - Block mode: 0 - display normally (except with R=1) 1 - rectangular block is cleared prior to plotting text. R - Reverse mode: 0 - normal display 1 - reverse mode size - Character size factor in display units: 0 = standard size, 1 = 5x7, 2 = 10x14, 3 = 15x21, etc. code - Plot process code
3	M		Position (M,N) of the string
4	N
5	C1	C2	Characters to be plotted based on process code.
6	C3	C4
7-xxx	Cx	Cx
xxx+1	M		Position (M,N) of the next string
xxx+2	N
xxx+3	C1	C2	Characters to be plotted based on process code.
xxx+4	C3	C4
xxx+5-yyy	Cx	Cx

Process Codes:

0 - Character data. M,N is lower left corner of first character.
1 - Weather symbols. Each symbol is determined from a 4 character mneumonic. M,N is the lower left corner of the symbol.
2 -