The usp line header, USP_LINE contains a sequence of
fields. The field values
associated with the binary data are also available as Dictionary
Definitions by preceding their names with "usp_"
(eg. usp_SmpInt=). They may be examined
in the Dictionary by end users or retrieved by application programs.
End users may override any of the field values associated
with binary input data. For example:
comment= override binary header value usp_NumTrc= 48 usp_SmpInt= 8 usp_CDPFld= 50
The first two above could just as well have been specified by their corresponding axis Definitions (assuming the default "axis= t x y"):
size.x=48 delta.t= 8.0
The default fields that make up the USP_LINE structure are
defined in
"${DDSROOT}/src/lib/dds3/usp.fmt.dds"
and may be modified by editing that file and putting it into a
directory defined by "${DDS_PATH}".
These defaults are summarized by their nominal offset, name, type,
and element count.
Off Name Type† N Comment
--- ------ --------- - -------------------------------
0 line_green_prefix USP_INT 1 "USP green word prefix"
4 EqpCod USP_CHAR 1 "Equipment code"
5 CrwNam USP_CHAR 6 "Crew Six Characters"
11 DatTyp USP_CHAR 1 "Data Type"
12 DgTrkS USP_CHAR 2 "Digital Truck System"
14 PrcNam USP_CHAR 10 "Processor Name"
28 PrcDat USP_CHAR 8 "Processing Date"
36 OACLin USP_CHAR 8 "OAC Line, 7 char right just"
44 JobNum USP_CHAR 8 "JOB Number 7 char right just"
52 NumTrc USP_INT 1 "number traces per record"
54 NumRec USP_INT 1 "number records per line"
60 SmpInt USP_INT 1 "sample interval ms"
64 NumSmp USP_INT 1 "number samples per trace"
68 FmtCod USP_SHORT 1 "format code"
70 IndAdj USP_SHORT 1 " adjustment"
72 OpGrFl USP_SHORT 1 "Opposite/Between Group Flag"
76 SrtTyp USP_CHAR 2 "Sort Type 0=FIFO 1=LA 2=mx/mn"
78 CDPFld USP_SHORT 1 "CDP Fold"
80 GrpInt USP_CHAR 4 "Group Interval"
84 DtInFl USP_INT 1 "Data Indicator Flag"
84* Dy1000 USP_INT 1 "Record interval*1000 (MBS)"
88 MxSPEl USP_SHORT 1 "Max Source Point Elevation"
90 MnSPEl USP_SHORT 1 "Min Source Point Elevation"
92 MxRSEL USP_SHORT 1 "Max Ref Surface Elevation"
94 MnRSEL USP_SHORT 1 "Min Ref Surface Elevation"
96 MxGrEl USP_SHORT 1 "Maximum group Elevation"
98 MnGrEl USP_SHORT 1 "Minimum group Elevation"
100 MxTrSt USP_SHORT 1 "Maximum trace Static"
102 MnTrSt USP_SHORT 1 "Minimum trace Static"
104 LinDir USP_CHAR 4 "Line Direction e.g., N45E"
108 AERcPr USP_INT 1 "Accumulative Est Rec Proc"
112 OrNTRC USP_SHORT 1 "Original traces Per Record"
114 OrNREC USP_SHORT 1 "Original Number records"
116 MutVel USP_FLOAT 1 "Muting Velocity"
120 ZDMuTm USP_SHORT 1 "Zero Distance Mutine Time"
122 IntInc USP_SHORT 1 "interpolation increment"
124 WatVel USP_INT 1 "Water Velocity"
124* RefVel USP_INT 1 "SLNT Reference Velocity(MBS)"
128 MxShDp USP_SHORT 1 "Maximum Shot Depth"
130 MnShDp USP_SHORT 1 "Minimum Shot Depth"
132 MxUHTm USP_SHORT 1 "Maximum Uphole Time"
134 MnUHTm USP_SHORT 1 "Minimum Uphole Time"
136 MxTrOf USP_SHORT 1 "Maximum traverse Offset"
138 MnTrOf USP_SHORT 1 "Minimum traverse Offset"
140 RATTrc USP_SHORT 1 "RATS Traces per Record"
140* AnglSt USP_SHORT 1 "SLNT Starting Angle (MBS)"
142 RATFld USP_SHORT 1 "RATS Fold"
142* AngInc USP_SHORT 1 "SLNT Angle Increment (MBS)"
144 UnitFl USP_SHORT 1 "Units Flag 0=feet 1=meters"
146 FrstSP USP_SHORT 1 "1st SP Number on Line"
148 DpN1SP USP_SHORT 1 "Dep Pt Num Below 1st Src Pt"
150 NmDpIn USP_SHORT 1 "Num Dep Pt Int per Unit Inc"
152 StWdFl USP_SHORT 1 "Static Wd Flag 0=old >=1 new"
154 DptInt USP_SHORT 1 "Depth Point interval"
156 TmMsSl USP_INT 1 "Time in ms of First Slice"
156* Dx1000 USP_INT 1 "Trace interval*1000 (MBS)"
160 TmSlIn USP_INT 1 "Time Slice increment in ms"
160* Dz1000 USP_INT 1 "Depth Interval*1000 (MBS)"
164 TmMsFS USP_FLOAT 1 "Time in ms of First Sample"
168 NTrLnS USP_INT 1 "Number Traces/Line Sorted In"
172 PltDir USP_SHORT 1 "Plot Direction"
174 LgRfEl USP_SHORT 1 "Log Reference Elevation"
176 MnLnIn USP_SHORT 1 "Minimum line Index"
178 MxLnIn USP_SHORT 1 "Maximum line Index"
180 MnDpIn USP_SHORT 1 "Minimum depth Index"
182 MxDpIn USP_SHORT 1 "Maximum depth Index"
184 ILClIn USP_FLOAT 1 "In Line Cell Increment"
188 CLClIn USP_FLOAT 1 "Cross Line Cell Increment"
192 ReSpFm USP_SHORT 1 "Reserved Special Format"
194 VlFnRF USP_SHORT 1 "Vel Func Ref Flag 0=RI 1=DI"
196 OACUsr USP_CHAR 4 "OAC USER Field"
200 LinNam USP_CHAR 8 "Line Name"
208 MutFlg USP_SHORT 1 "Mute Flag 0=yes 1=no"
210 SPBias USP_CHAR 2 "Shot point Bias"
212 SpBiFl USP_SHORT 1 "Shot Point Bias Flag"
214 APIWNo USP_CHAR 12 "API Well Number"
228 NmSpMi USP_FLOAT 1 "Number Shot points per Mile"
604 VelFun USP_SHORT 200 "velocity function"
604* MinVel USP_SHORT 1 "Minimum velocity (MBS)"
606* MaxVel USP_SHORT 1 "Maximum velocity (MBS)"
700 UnitSc float4 1 "Scale factor for time axis"
1004 HlhEnt USP_SHORT 1 "Number of Entries in HLH"
1006 HlhByt USP_SHORT 1 "Number of Bytes in HLH"
1008 HlhBuf unsigned1 0 "HLH buffer (sizes and char)"
* PadLine unsigned1 0 "USP Line header pad"
where * indicates overloading of
fields for the same byte locations.
† See
Data Types for more
details.