GEODYN¶
geodyn format¶
The geodyn format is a common format for geophysical data files. The
file structure is simple, a header and the data section.
as an example, below a DEM (digital elevation model) is shown in the
geodyn format:
!--------------------------------------------------------------------
!PROJECT: KARST Einhornhoehle
!LOCATION: Einhornhoehle
!DATA: DTM (Landesamt Niedersachsen)
!OPERATOR:
!DATE:
!COORDINATES: UTM 32T
!NOTES: 2m resolution (resampled), offset -44.90m substracted
!--------------------------------------------------------------------
!VALUE: datetime easting northing elev depth topo value
!UNIT: [m] [m] [m] [m] [m] [xx]
2019-01-11-18:00:00 596000.00 5722100.00 330.01 0.00 330.01 0.00
2019-01-11-18:00:00 596002.00 5722100.00 330.04 0.00 330.04 0.00
2019-01-11-18:00:00 596004.00 5722100.00 330.08 0.00 330.08 0.00
2019-01-11-18:00:00 596006.00 5722100.00 330.11 0.00 330.11 0.00
2019-01-11-18:00:00 596008.00 5722100.00 330.15 0.00 330.15 0.00
Lines starting with an ampersand (!) are comment lines. The capitalised key words are used to sort the information in this header lines:
keyword |
description |
|---|---|
!PROJECT: |
project name |
!LOCATION: |
locality |
!DATA: |
type of data, origin |
!OPERATOR: |
people responsible for data aquisition |
!DATE: |
date of data processing |
!COORDINATES: |
coordinate system used |
!NOTES: |
additional notes |
The last two lines in the header are VALUE and UNIT for the column data following.
All other lines are data, following the format
field |
description |
|---|---|
datetimestring |
date and time for proceesed data |
easting |
easting in UTM coordinates |
northing |
northing in UTM coordinates |
elev |
elevation |
depth |
depth of field value (sensor location) |
value1 |
field value 1 |
value2 |
field value 2 |
The geodyn format can hold any type of data, e.g. 1D borehole logs,
2D map view data (gravity, magnetic, self-potential, topography, …) and
2D cross section data (geoelectrics, georadar, …), or 3D data.
From ERT to geodyn¶
Within Res2DInv, use the display window to display data, then export
with swapped depth axis. The resulting name.xyz-file will hold the
exported data. From the many formats, use the blocks without topography
section, and save as name.blocks
Together with the profile data name.profile use the program
ERT_Res2DInv2GEODYN to create a file in geodyn format.
From GPR to geodyn¶
Within ReflexW, export the processed profiles as ascii 4 colunm format
(use traceheader coordinates!). The resulting file name.ASC holds
the coordinates, two-way traveltime, and reflection amplitudes.
Together with the profile data name.utm use the program
GPR_REFLEXW2GEODYN to create a file in geodyn format. Needs the
traceincrement and the estimated velocity!
json format¶
GEO_GEODYN2JSON3D_GEODYN2INFO3D_GEODYN2VTK3D_GEODYN2JSON
