DELILAH Minigrid Survey Data: 3D 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 DELILAH minigrid survey data presented in the 3D-format data files contains the survey line number, x (cross-shore) , y (longshore) and z (depth relative to NGVD) coordinates in meters. Coordinates are relative to a pier-orthogonal system whose origin is located behind the dunes and along the FRF's south property boundary.

Sample: 3D Minigrid Format line
DE170   2901001  907        89.682   1282.351      2.837 
Each data line uses the following format:

Parameter and FORTRAN Format specification
Locality Code (DE for DELILAH) A2
Profile Line number A3
Survey number I4
Date (YYMMDD) I6
Computer Clock Time (EST in HHMM) I5
X coordinate (cross-shore in m) F11.3
Y coordinate (longshore in m) F11.3
Z coordinate (elevation, m NGVD) F11.3

3D survey data files are ASCII files containing all profile lines surveyed during a single survey. The filenames include the survey date. For example, the file containing survey data collected on October 12, 1990 is labeled DE901012.3d.

To access the DELILAH 3D minigrid survey data files

To access plots of the 3D files in either gif or cgm graphic formats.

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