DELILAH Survey Data: 2d Format (also called the ISRP or EDIT2 Format)

The DELILAH survey data were collected using the Coastal Research Amphibious Buggy or CRAB, a 10-m tall self-propelled tripod. Position of the CRAB was determined using a Geotronics 140T auto-tracking total station. This system aims an infrared beam at a reflecting prism mounted on the CRAB and measures the spherical coordinates associated with each position. The Geodimeter 140T tracks the CRAB and samples at 1Hz. There were errors associated with the Geodimeter (vertical noise and drifting) which are described in the Survey Section.

The profile-survey cross-section ( X - distance offshore and Z - depth) data are stored in a single file named DELILAH.2d which is sorted by profile number and then by survey number. The alongshore location, in the FRF coordinate system, for each of the Minigrid profile lines is listed in the table below. Cross-shore distances are measured relative to a shore-parallel baseline with its origin at the SE corner of the FRF property.

Profile       Longshore
Line          Distance
Number          (m)
------        --------
170             1280
180             1234
195             1189
200             1143
210             1097
215             1074
220             1052
225             1029
230             1006
235              997
240              954
250              914
255              892
260              869
265              846
270              823
275              797
280              777
285              754
290              732

The data are stored in an EDIT2 format. Two profile-surveys in the EDIT2 format starting with an initial Header Record are shown below.

Sample: EDIT2 Format Data

00        112M NGVDDELILAH CRAB Surveys                              961030 WAB
DE170   21901001  924319 -464             631  606  675  616  713  570  754  463
DE170   22  806  348  808  348  896  283  935  300  941  302  945  307  950  308
DE170   23  956  310  985  289 1011  283 1028  270 1036  259 1046  247 1059  225
DE170   24 1135   91 1146   77 1157   69 1165   59 1173   53 1180   46 1188   39
DE170   25 1227   15 1234   12 1242    8 1246    6 1261    2 1269   -2 1276   -7
DE170   26 1285   -4 1292  -10 1298   -9 1325  -22 1334  -30 1340  -32 1351  -35
DE170   27 1359  -36 1367  -39 1376  -49 1381  -52 1389  -57 1400  -63 1406  -69
DE170   28 1414  -77 1425  -82 1431  -84 1438  -88 1445  -93 1452  -95 1459  -98
DE170   29 1468 -100 1475 -103 1480 -105 1487 -106 1492 -107 1497 -108 1504 -108
DE170   2: 1514 -110 1523 -111 1530 -111 1536 -111 1543 -111 1551 -109 1558 -110
DE170   2; 1565 -109 1570 -109 1579 -109 1585 -108 1591 -106 1598 -106 1605 -106
DE170   2& 1611 -106 1618 -103 1625 -103 1630 -103 1637 -104 1643 -102 1650 -100

The first line is a Header Record that defines details of the data format including the units of the data and how many decimal places are stored for both distance and elevation. The Header Record format is:

Field                                  FORTRAN Format
   00                                          A2
   Blank                                       8X
   Data format (1=Edit2, 2=Edit3, 3=Edit3)     I2
   Distance decimal places                     I1
   Elevation decimal places                    I1
   Units (FT or M )                            A2
   Datum Description (NGVD, MSL, etc)          A4
   Project Description                         A50
   Data processing date                        A6
   Blank space                                 1X
   Data processors Initials                    A4

The survey data start with an 80 character line followed by a series of 80 character continuation lines. Each block contains the data for one survey of one profile (known as a profile-survey). "Profile" number refers to a particular location, the "survey" number identifies the consecutive survey of that location. The data are stored in meters as integer values according to the Header Record specification. For the DELILAH data decimal places are 1 for distances and 2 for elevations. Elevation data are referenced to the National Geodetic Vertical Datum of 1929 (NGVD). The locality code defines the beach where the data were collected. For DELILAH the locality code is DE.

The Edit2 format can be deciphered as follows:

Initial Line:                          FORTRAN Format
  Locality Code                                 A2
  Profile Number                                A3
  Survey Number                                 I4
  Line Number (always 1)                        A1
  Date (YRMODA)                                 I6
  Time                                          I5
  Number of Survey Points                       I3
  Minimum Elevation Reached                     F5.2
  Information Label                             A11
  First 4 Distance-Elevation Pairs              4(F5.1, F5.2)

Continuation Lines:
  Locality Code                                 A2
  Profile Number                                A3
  Survey Number                                 I4
  Line Number (2-9, A-Z, a-z, misc characters)  A1
  Seven Distance-Elevation Pairs                7(F5.1, F5.2)

In FORTRAN, the block can be read with the following read statement:

Character Locality*2,iProfile*3,

read(7,100)Locality,iProfile,iSurvey,iDate,iTime,Npts,aMin,Label,
&(x(i),y(i),i=1,Npts) 100
format(A2,A3,I4,I6,I5,F5.2,A11,4(F5.1,F5.2),/,(10x,7(F5.1,F5.2)))

Note: For you non-FORTRAN folks, A=alphanumeric field, F=floating point, and I=Integer field. The associated number is the field width in characters, and the decimal point indicates where the decimal place should go. (ie: F5.1 = a real number 5 characters wide with one decimal place)



To access the DELILAH 2D survey data file DELILAH.2d

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