SDTS:

Annex G

(Normative)

Registration of Cell Values to Internal Reference System

G.1 Overview of Reference Systems

There are two reference systems defined by section 5.2.4: an Internal Spatial Reference System and an External Spatial Reference System. The Raster Modules provide two additional reference systems: the Raster Object Scan Reference system and the Layer Scan Reference system. The following definitions summarize these four reference systems:

External Reference system - As defined by the External Spatial Reference and the Dimension Definition modules, if the Dimension Definition module is used. This reference system defines the space in which the data set lies. A coordinate for this reference system is called an External Coordinate.
Internal Reference system - As defined by the Internal Spatial Reference and the Dimension Definition modules. The Internal Coordinate, also called the Spatial Address, is used to locate points in the Internal Reference system. The Spatial Address can be transformed into a External Coordinate by applying the transformation parameters defined in the Internal Reference record. The Internal Reference record transformation parameters are only used to transform the three geospatial dimensions. Nongeospatial dimensions will not be transformed, therefore, the values for these dimensions will appears as they are found in the Spatial Address (See 5.2.4, Spatial Reference Modules).
Raster Object Scan Reference system - As defined by the Raster Definition module. The Raster Object Coordinate is used to locate points in the Raster Object Scan Reference system. The Raster Object Coordinate can be reflected, translated, and scaled into a Spatial Address by parameters found in the Raster Definition module.
Layer Scan Reference System - As defined by the Layer Definition module. The Layer Coordinate is used to locate points in the Layer Scan Reference System. A Layer Coordinate, also called an index, is explicitly coded for the first Cell Value of each Cell Record. Subsequent Cell Value indexes of a record are derived by this first index plus parameters defined in the Internal Spatial Reference, Dimension Definition, Raster Definition and Layer Definition modules (See G.2). These indexes can be translated to a Raster Object Coordinate by parameters found in the Layer Definition module.

The remainder of this annex discusses the parameters necessary to perform the transformations of layer coordinates to raster object coordinates, and subsequently to internal coordinates.

G.2 Rules for Assigning Layer Coordinates to Cell Values.

The definitions in section G.1 require that each Cell Value be assigned a Layer Coordinate before the Cell Value can be registered to the Internal Reference system. To assign a Layer Coordinate to every cell of the layer requires knowledge about the sequence in which Cell Values will occur within the Cell Record. Basically, an n-dimensional array space must be mapped into a linear sequence. The method used by this standard to specify this order uses a conceptual structure called a cartesian label. The cartesian label is derived from parameters found in the Internal Spatial Reference, Dimension Definition, Raster Definition and Layer Definition modules. When the Cartesian product is performed on a cartesian label, an ordered list, composed of unique indexes, will be generated (see Part 3, 6.1.4, Order of Data Items in Arrays). The indexes generated in this fashion can be directly mapped to Layer Coordinates.

The two ordered sets, the sequence of Cell Values in a module record and the list of indexes (labels) from the cartesian product, can be matched up item for item---thus assigning an n-dimensional coordinate to every Cell value. The Layer Coordinate for the first Cell Value of the Cell Record is encoded in the Cell Record. The Layer Coordinate for the first Cell Value can be mapped to an index located in the list of indexes, called the Primary Index. All Cell Values following the first Cell Value can be matched to indexes following the Primary Index. Each Cell record will need a separate Primary Index to locate the first Cell Value of the record. Mapping indexes to Layer Coordinates and back is discussed in section G.3.

G.3 Generating a Cartesian Label for a Raster Object.

The Cell Values of an n-dimensional array are stored linearly in the repeating Cell Values field of the Cell module. The collection of Cell Values for a layer may be encoded in one record or in multiple records, but the order Cell Values are encoded within the Cell record is defined by the cartesian label. The cartesian label defines the cartesian coordinate system called the Layer Scan Reference system.

The cartesian label defines the Cartesian coordinate system by specifying the number of dimensions, the extent of each dimension and the order of expansion when the cartesian product is taken. Changing the order of repetition for the Dimension ID fields will change the cartesian label generated. The X, Y, and, if needed, Z dimensions will always be the last dimensions of the cartesian label.

The cartesian label is composed of multiple vector labels. Each vector label essentially labels one dimension of the Layer Scan Reference System, thus a four dimensional raster will have a cartesian label composed of four vector labels. The vector label is composed of simple labels. Each simple label provides a value for a position along the dimension. To clarify we will use the following notation:

m = total dimensions geospatial and nongeospatial. This count is derived from the Internal Spatial
Reference record referenced by RSDF/ISID. The number of dimensions will be two or greater.
The Internal Spatial Reference record can be used to find the number of dimensions as follows:
m = 2 + (1 if Z used) + (# of repetitions of the IREF/DMID field)
n = a unique value used to identify a specific dimension of the raster. NOTE: the first two dimensions
will always be the geospatial dimensions X and Y respectively and if the geospatial dimension Z
is used then the Z dimension will be the third dimension. If the Z dimension is not used, then the
third dimension will be the first nongeospatial dimension. All nongeospatial dimensions will
appear after the geospatial dimensions, and the order the nongeospatial dimensions appear will
be dependent on the order Dimension ID fields repeat in the Internal Reference Record for the
raster object in question.

X dimension or Column of the raster - n = 1
Y dimension or Row of the raster - n = 2
Z dimension or Plane of the raster - n = 3 (when the Z dimension is used)
the first IREF/DMID - n = 3 (when Z is not used) or 4 (when Z is used)
the second IREF/DMID - n = 4 (when Z is not used) or 5 (when Z is used)
.
.
.
the last IREF/DMID - n = m

en = extent of the layer along dimension n.
e1 - LDEF/LDEF/NCOL
e2 - LDEF/LDEF/NROW
e3 - LDEF/LDEF/NPLA (if the Z dimension is used)
e4 - The first repetition of LDEF/LDXT/DEXT
e5 - The second repetition of LDEF/LDXT/DEXT
.
.
.
em - The last repetition of LDEF/LDXT/DEXT

v = an index value used to identify a specific position along the dimension; legal values will be integers
from 1 to en for a given dimension n.
slv n = simple label located at index v along dimension n.
if LDEF/LDEF/SORI is 0 then slvn = v-1
if LDEF/LDEF/SORI is 1 then slvn = v

vln = vector label for the nth dimension, composed of en index values.
= sl1 n!sl2 n! ... !sl(_en-1) n!sl_e2 n

cl = cartesian label for the Layer Scan Reference System, composed of m vector labels, one for each
dimension. The order vector labels are placed in the cartesian label is defined as follows:
Right most three vector labels will be for the geospatial dimension X, Y and Z. The order the X,
Y and Z vector labels will appear in the Cartesian label will be dependent on the value of the
RSDF/RSDF/FSCN subfield. The FSCN subfield indicates which of the three dimension
proceeds first, which proceeds second and which last. The dimension to proceed first will be the
last vector label to appear in the cartesian label. The dimension to proceed second will be the
second from last vector label in the cartesian label. And the dimension to proceed last will be the
third from the last vector label in the cartesian label. If the Z dimension is not used, then no vector
label will be present in the cartesian label for the Z dimension. NOTE: The raster modules uses
the term column for the X dimension, row for the Y dimension, and plane for the Z dimension, all
other dimensions are termed as they appear in the Dimension Definition record.
The remaining vector labels will be ordered based on the order of repetition of the IREF/DMID
field. The dimension referenced by the last DMID field will have the first vector label in the
cartesian label. The next to last DMID field will have the second vector label in the cartesian
label. etc...
= vlm*vl(m-1)* ... *vl1*vl2 (This cartesian label shows an order where the RSDF/RSDF/FSCN is equal
to 'R') If RSDF/RSDF/FSCN is equal to 'C' then the last two vector labels would have been
switched. For an example, see Part 3, 6.1.4, Order of Data Items in Arrays.
After performing the substitutions, the syntax for the cartesian label is as follows:
cl = sl1 m!sl2 m! ... !sl_em m*sl1 m-1!sl2 m-1! ... !sl_em-1 m-1* ..... *sl1 1!sl2 1! ... !sl_e1 1*sl1 2!sl2 2! ... !sl_e2 2

Expanding the cartesian label will yield an ordered list of indexes found in Table 68.

The indexes generated in the table above are not in the correct order to be used as a Layer Coordinate. The indexes must be mapped as follows to generate a Layer Coordinate:

	dn = an integer index along dimension n, an element of the Layer coordinate.  
		Layer Coordinate elements, when derived  from a cartesian label index:
			d1 - slv 1
			d2 - slv 2
			d3 - slv 3
			d4 - slv 4
			d5 - slv 5
			.
			.
			.
			dm - slv m


		Layer Coordinate elements, when deriving the Primary Index.
			d1 - CELL/CELL/COLI
			d2 - CELL/CELL/ROWI
			d3 - CELL/CELL/PLAI ( if the Z axis is used)
			d4 - the first repetition of CELL/DNDX/ANVL.
			d5 - the second repetition of CELL/DNDX/ANVL
			.
			.
			.
			dm - the last repetition of CELL/DNDX/ANVL

Table 68 - List of indexes generated by taking the cartesian product

Repetition No.
Index

1

sl1 m!sl1 m-1!...!sl1 1!sl1 2

2

sl1 m!sl1 m-1!...!sl1 1!sl2 2

3

sl1 m!sl1 m-1!...!sl1 1!sl3 2

.

.

.

.

.

.

e2 - 1

sl1 m!sl1 m-1!...!sl1 1!sle2-1 2

e2

sl1 m!sl1 m-1!...!sl1 1!sle2 2

e2 + 1

sl1 m!sl1 m-1!...!sl2 1!sl1 2

e2 + 2

sl1 m!sl1 m-1!...!sl2 1!sl2 2

.

.

.

.

.

.

e1 * e2 - 1

sl1 m!sl1 m-1!...!sle1 1!sle2-1 2

e1 * e2

sl1 m!sl1 m-1!...!sle1 1!sle2 2

e1 * e2 + 1

sl1 m!sl2 m-1!...!sl1 1!sl1 2

e1 * e2 + 2

sl1 m!sl2 m-1!...!sl1 1!sl2 2

.

.

.

.

.

.

e1 * e2 * ... * em-1 - 1

sl1 m!slem-1 m-1!...!sle2 1!sle2-1 2

e1 * e2 * ... * em-1

sl1 m!slem-1 m-1!...!sle2 1!sle2 2

e1 * e2 * ... * em-1 + 1

sl2 m!sl1 m-1!...!sl1 1!sl1 2

e1 * e2 * ... * em-1 + 2

sl2 m!sl1 m-1!...!sl1 1!sl2 2

.

.

.

.

.

.

e1 * e2 * ... * em-1 * em - 2

slem m!slem-1 m-1!...!sle1 1!sle2-2 2

e1 * e2 * ... * em-1 * em - 1

slem m!slem-1 m-1!...!sle1 1!sle2-1 2

e1 * e2 * ... * em-1* em

slem m!slem-1 m-1!...!sle1 1!sle2 2

Table 68 - List of indexes generated by taking the cartesian product
Repetition No.	Index
1	sl1 m!sl1 m-1!...!sl1 1!sl1 2
2	sl1 m!sl1 m-1!...!sl1 1!sl2 2
3	sl1 m!sl1 m-1!...!sl1 1!sl3 2
.	.
.	.
.	.
e2 - 1	sl1 m!sl1 m-1!...!sl1 1!sle2-1 2
e2	sl1 m!sl1 m-1!...!sl1 1!sle2 2
e2 + 1	sl1 m!sl1 m-1!...!sl2 1!sl1 2
e2 + 2	sl1 m!sl1 m-1!...!sl2 1!sl2 2
.	.
.	.
.	.
e1 * e2 - 1	sl1 m!sl1 m-1!...!sle1 1!sle2-1 2
e1 * e2	sl1 m!sl1 m-1!...!sle1 1!sle2 2
e1 * e2 + 1	sl1 m!sl2 m-1!...!sl1 1!sl1 2
e1 * e2 + 2	sl1 m!sl2 m-1!...!sl1 1!sl2 2
.	.
.	.
.	.
e1 * e2 * ... * em-1 - 1	sl1 m!slem-1 m-1!...!sle2 1!sle2-1 2
e1 * e2 * ... * em-1	sl1 m!slem-1 m-1!...!sle2 1!sle2 2
e1 * e2 * ... * em-1 + 1	sl2 m!sl1 m-1!...!sl1 1!sl1 2
e1 * e2 * ... * em-1 + 2	sl2 m!sl1 m-1!...!sl1 1!sl2 2
.	.
.	.
.	.
e1 * e2 * ... * em-1 * em - 2	slem m!slem-1 m-1!...!sle1 1!sle2-2 2
e1 * e2 * ... * em-1 * em - 1	slem m!slem-1 m-1!...!sle1 1!sle2-1 2
e1 * e2 * ... * em-1* em	slem m!slem-1 m-1!...!sle1 1!sle2 2

G.4 Assigning a Layer Coordinate with Multiple Layers per Cell Module.

When more than one layer is encoded into the same Cell Module, assignment of Layer Coordinates will be effected by the Cell Sequencing Code, RSDF/RSDF/CSCD, and sometimes by the order of repetition of the Layer ID fields, RSDF/LYID. For multiple layers to occupy the same cell module four rules must be followed:

Rule number one, all layers must be part of the same raster object, i.e. the Raster Definition record must have a Layer Foreign ID pointer to each of the Layer records to be coded in the same Cell module.
Rule number two, only one Layer coordinate will be assigned for each CVLS field. Although, it is possible for the same Layer Coordinate to be assigned to more than one CVLS field, thus the Cell Values with the same Layer Coordinate are coincident.
Rule number three, all layers must have Cell Values for the same Raster Object Coordinate, i.e. if a layer has missing values then all layers will have missing values in the same locations.
Rule number four, to allow all layers to be interleaved in the same Cell module, the following subfields must contain the same values for each layer. If the subfield or field is missing from one layer, then subfield or field will be missing from the other layer(s) as well.

	LDEF/LDEF/CMNM - Cell Module Name
	LDEF/LDEF/NROW - Number of Rows
	LDEF/LDEF/NCOL - Number of Columns
	LDEF/LDEF/NPLA - Number of Planes
	LDEF/LDEF/SORI - Scan Origin Row
	LDEF/LDEF/SOCI - Scan Origin Column
	LDEF/LDEF/SOPI - Scan Origin Plane
	LDEF/LDEF/RWOO - Row Offset Origin
	LDEF/LDEF/CLOO - Column Offset Origin
	LDEF/LDEF/PLOO - Plane Offset Origin
	LDEF/LDEF/INTR - Intracell Reference Location
	LDEF/LDXT - Layer Dimension Extent Field
		(All repetitions of the repeating LDXT field must be the same for all layers.)

When these conditions are met, the cartesian label will be identical for all interleaved layers. Assigning a Layer Coordinate to the CVLS field, is the same as assigning a Layer Coordinate to all Cell Values of the CVLS field. The process for assigning a Layer Coordinate to the CVLS field is defined in section G.3. Additional restrictions are imposed depending on the Cell Sequencing Code used.

G.4.1 Assigning a Layer Coordinate to a Cell Value when the GI Sequence is used.

When the layer sequential, GI, sequence code is specified, the Cell Values for each layer will be encoded in separate records. Regardless of how the records are interleaved, each record will have a separate Primary Index, as defined in section G.3. The Primary Index is used with the layers cartesian label to assign Layer Coordinates to each Cell Value.

G.4.2 Assigning a Layer Coordinate to a Cell Value when the GJ Sequence is used.

When the layer interleaved by line, GJ, sequence code is specified, the Cell Values for each layer will be encoded in the same record. All Cell Values for the first layer will be encoded in the first consecutive set of CVLS fields. The Cell Values for each layer will be encoded in consecutive sets of CVLS fields. There is no restriction on how much of the layer is coded in the record, but there must be equal numbers of Cell Values coded in the Cell Record for each layer. This encoding scheme requires the layers to have the same dimensions and they must be coincident with each other.

G.4.3 Assigning a Layer Coordinate to a Cell Value when the GL Sequence is used.

When the layer interleave by pixel, GL, sequence code is specified, each Cell Values field will contain one cell value from each layer. This encoding scheme requires the layers to have the same dimensions and they must be coincident with each other.

G.4.4 Assigning Layer Coordinates to Cell Values Utilizing Tesseral Indexing.

This standard provides the ability to transfer tesserally indexed raster data, but it does not provide the necessary rules for assigning Layer Coordinates to cell values. The responsibility for providing the tesseral indexing rules is left for the data encoder to define. Any data encoder using tesseral indexing will need to consider the parameters used in section G.2 while defining these rules. Once these rules have been established, the Layer Coordinates assigned by the new rules can be used as defined in section G.5. When tesseral indexing is used, the Row Index, Column Index and Plane Index subfields as well as the Dimension Index field of the Cell module can not be used; the Tesseral Index subfield of the Cell module will be used instead.

G.5 How to Transform a Layer Coordinate into a Spatial Address

To give an accurate description of how spatial addresses are assigned to cells the following definitions can be used to transform a layer coordinate from the layer scan reference system to the internal reference system (see Figure 33)

	m = as defined in section G.3
	n = as defined in section G.3
	en = as defined in section G.3
	dn = as defined in section G.3.
	pn = extent of the raster along dimension n.
		p1 - RSDF/RSDF/CLXT
		p2 - RSDF/RSDF/RWXT
		p3 - RSDF/RSDF/PLXT
		p4 - The first repetition of RSDF/RDXT/DEXT
		p5 - The second repetition of RSDF/RDXT/DEXT
			.
			.
			.
		pm - The last repetition of RSDF/RDXT/DEXT
	rn = the cell size, in Internal Coordinates, along dimension n of the raster.  The resolution for the X, Y 
and Z dimension, found in the Internal Spatial Reference record, will be divided by the Scaling 
factor, SFAX, SFAY and SFAZ, to transform the resolution from External scale to Internal scale. 
This assumes the cell size along a dimension is constant.  For variable cell size along a 
dimension see section G.6.
		r1 - IREF/IREF/XHRS divided by IREF/IREF/SFAX
		r2 - IREF/IREF/YHRS divided by IREF/IREF/SFAY
		r3 - IREF/IREF/ZHRS divided by IREF/IREF/SFAZ (if Z axis is used)
		r4 - the DMDF/DMDF/DRES pointed to by the first repetition of IREF/DMID
		r5 - the DMDF/DMDF/DRES pointed to by the second repetition of IREF/DMID
			.
			.
			.
		rm - the DMDF/DMDF/DRES pointed to by the last repetition of IREF/DMID
	sn = indicates if the Layer Scan Reference origin for dimension n starts at zero or one.  If the value is 
zero then the dimensions Layer Scan Reference system starts at zero.  If the value is one then 
the dimensions layer scan reference system starts at one.   These values are derived from the  
following locations:
		s1 - LDEF/LDEF/SOCI
		s2 - LDEF/LDEF/SORI
		s3 - LDEF/LDEF/SOPI (if Z axis is used)
		s4 - the first repetition of LDEF/LDXT/SODM
		s5 - the second repetition of LDEF/LDXT/SODM
			.
			.
			.
		sm - the last repetition of LDEF/LDXT/SODM
	on = an Internal Coordinate value which locates the origin of the Raster Object Reference system 
along dimension n.
		o1 - RSDF/SADR/X
		o2 - RSDF/SADR/Y
		o3 - RSDF/SADR/Z (if the Z axis is used)
		o4 - RSDF/SADR/<subfield for first nongeospatial dimension>
		o5 - RSDF/SADR/<subfield for second nongeospatial dimension>
.
			.
			.
			.
		om - RSDF/SADR/<subfield for last nongeospatial dimension>
	tn = integer translation value to move dimension n of the Layer Scan Reference system origin to the 
Raster Object Scan Reference system.
		t1 - LDEF/LDEF/CLOO
		t2 - LDEF/LDEF/RWOO
		t3 - LDEF/LDEF/PLOO (if the Z axis is used)
		t4 - the first repetition of LDEF/LDXT/DTOO
		t5 - the second repetition of LDEF/LDXT/DTOO
			.
			.
			.
		tm - the last repetition of LDEF/LDXT/DTOO
	cn = the Internal Coordinate value which locates index dn along dimension n 
	an = a value, +1 or -1, indicating the orientation of the Raster Object Scan Reference origin with 
respect to the Internal Reference Origin for the dimension n.  A positive one indicates the raster 
object scan reference axis and the internal reference axis are oriented the same way.  A minus 
one indicates the two axes are oriented opposite ways.
		if RSDF/RSDF/SCOR indicates Left, a1 = +1
		if RSDF/RSDF/SCOR indicates Right, a1 = -1
		if RSDF/RSDF/SCOR indicates Top,  a2 = -1
		if RSDF/RSDF/SCOR indicates Bottom, a2= +1
		if RSDF/RSDF/SCOR indicates Z runs negative to positive, a3 = +1
		if RSDF/RSDF/SCOR indicates Z runs positive to negative, a3 = -1
		the first repetition of RSDF/RDXT
			if DSCO = PN, value for dimension 4, a4 = -1 
			if DSCO = NP, value for dimension 4, a4 = +1
		the second repetition of RSDF/RDXT
			if DSCO = PN, value for dimension 5, a5 = -1 
			if DSCO = NP, value for dimension 5, a5 = +1
				.
				.
				.
		the last repetition of RSDF/RDXT
			if DSCO = PN, value for dimension m, am = -1 
			if DSCO = NP, value for dimension m, am = +1
	R = a vector representing the Internal Reference system cell sizes for all dimensions, derived from the 
records pointed to by the Internal Spatial  ID field  of the Raster Definition module.
		[r1 r2 r3 r4 r5  . . . . . rm ]
	S = a vector where each value is zero or one.  
		[ s1 s2 s3 s4 s5  . . . . . sm ]
	D = a vector representing a integer index into the Layer Scan Reference system, usually derived when 
a Cell Value's index is needed.  Every Cell record has a Layer Coordinate, D, to locate the first 
cell of the record.
		[d1 d2 d3 d4 d5   . . . . . dm ]
	O = a vector representing the Internal Coordinate of the Raster Object Scan reference system origin, 
derived from the SADR field in the Raster Definition module.
		[o1 o2 o3 o4 o5  . . . . . om]
	T = a vector used to translate the Layer Scan Reference system to the Raster Object Scan Reference 
system.
		[t1 t2 t3 t4 t5   . . . . . tm ]
	A = a vector representing the location of the Raster Object Scan Reference system origin with respect 
to the World Coordinate origin.
		[a1 a2 a3 a4 a5  . . . . . am ]
	Rd = mxm diagonal matrix where the values of the vector R are along the diagonal.
	Ad = mxm diagonal matrix where the values of the vector A are along the diagonal.
	C = the resultant vector for the Layer Coordinate D.  This vector is also known as the Spatial Address 
for the Layer Coordinate D.  The vector C  is defined by the following matrix formula:
	    = O + ( D - S + T ) * Rd * Ad

When the default implementation is used for the Object Representation Code, G2, the formula for C is defined as follows (See 5.7.5, Default Implementation):

	m = 2
	O = derived as indicated above.
		[ o1  o2 ]
	T = [ 0  0 ]
	D = derived as indicated above.
		[ d1  d2 ]
	S = [ 0  0 ]
	R = derived as indicated above
		[ r1  r2 ]
	A = [ +1   -1 ]
	Rd = derived as indicated above
	Ad =  derived as indicated above
	C = the same as above, but we can simplify it because of the default values:
	    = O + D * Rd * Ad

G.6 Transforming a Layer Coordinate to a Spatial Address using Labels.

This standard allows one or more dimensions of a raster to be labeled, when the resolution for the dimension is not constant. When an axis is labeled each position of the axis in the Raster Object Scan Reference system will have one label indicating where the corresponding position lies in the Internal Reference system. If a dimension requires labeling, then the resolution for the labeled dimension will be set to zero. The geospatial dimensions, X, Y and Z, can be labeled, but the labels must match the format defined by the raster's Internal Reference record. The nongeospatial dimensions can be labeled, but the labels must match the format defined by the dimension's Dimension Definition record. The labels will be stored in the repeating fields, each dimension will be labeled in a specific field (see Table 69).

If the Z dimension were labeled, the IREF/IREF/ZRES would be zero and there would be RSDF/RSDF/PLXT repetitions of the RSDF/ZXLB field. Each ZXLB field would contain a label for the corresponding position along the Z dimension of the Raster Object Scan Reference system.

To use the labels, perform the calculations as defined in section G.3 and then for the dimensions with a zero resolution, a label will have to be placed in the corresponding dimension of the C vector. The following formula can be used.

	c_n = LBL_n  _(dn=0n)

If the nth dimension's resolution is zero, the value for cnth element of the C vector will be the (dn+on)th label of the nth dimension's list of labels.

Table 69 - Location of labels when a dimension is labeled.

Dimension
Field with labels located in it
Subfield containing the Label Field's Number of Repetitions
Notation used when referencing the label.

1

RSDF/XXLB

RSDF/RSDF/CLXT

LBL1

2

RSDF/YXLB

RSDF/RSDF/RWXT

LBL2

3

RSDF/ZXLB¹

RSDF/RSDF/PLXT

LBL3

4

RSDF/DAL0

RSDF/RDXT/DEXT (1st rep.)

LBL4

5

RSDF/DAL1

RSDF/RDXT/DEXT (2nd rep.)

LBL5

6

RSDF/DLA2

RSDF/RDXT/DEXT (3rd rep.)

LBL6

.

.

.

.

.

.

m

RSDF/DAL(m-4)

RSDF/RDXT/DEXT (last rep.)

LBLm

¹
if the Z dimension is used

Table 69 - Location of labels when a dimension is labeled.
Dimension	Field with labels located in it	Subfield containing the Label Field's Number of Repetitions	Notation used when referencing the label.
1	RSDF/XXLB	RSDF/RSDF/CLXT	LBL1
2	RSDF/YXLB	RSDF/RSDF/RWXT	LBL2
3	RSDF/ZXLB¹	RSDF/RSDF/PLXT	LBL3
4	RSDF/DAL0	RSDF/RDXT/DEXT (1st rep.)	LBL4
5	RSDF/DAL1	RSDF/RDXT/DEXT (2nd rep.)	LBL5
6	RSDF/DLA2	RSDF/RDXT/DEXT (3rd rep.)	LBL6
.	.
.	.
.	.
m	RSDF/DAL(m-4)	RSDF/RDXT/DEXT (last rep.)	LBLm

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