Import/Append Base Station Data
Use the Gravity > Base Stations > Import/Merge Base Station Data menu option (GRLDBASEGX) to import base station data into the base station database.
Import/Merge Base Station Data dialog options
Load Base Station Data from Text Data File dialog options
Base file to load |
Select the name of the base station (comma-delimited) text file. |
Load Base Station Data from Database dialog options
Base station survey database |
Select the name of the base station database file. |
Load Base Station Data (from Survey file) dialog options
This dialog is called directly by the Gravity Import tool.
Application Notes
The base station data is loaded/imported into the base station database from either an existing Geosoft database, a comma delimited text file, or a text file, in one of the supported gravity instrument formats. Regardless of the source, once imported, the base station database has predefined channel names; these are indicated in double quotes in the leftmost column below.
Base Station Fields
Station number |
A unique station number that is used to look-up base station parameters during the reduction of survey data. |
Absolute gravity |
The absolute gravity at the base station in milligals. You can use one of the options below to determine its value:
|
Longitude, Latitude |
The geographic location of the base station. This location is used to establish the earth tide correction. Note that longitudes are negative in the Western hemisphere. |
Elevation |
This is optional information that is not used in the data reduction. By default, elevation units are assumed to be metres. You can change the elevation units by editing the channel information and setting the unit abbreviation. |
The values in quotes must be the channel names or the text file column headers in the comma delimited file. Some, however, can be user defined if the selected file is in the instrument survey file format.
Example of a comma-delimited (CSV) format file:
Station,Gravity,Longitude,Latitude,Elevation90010,979894.143,-89.2123166667,48.1929916667,340
90020,979895.21,-89.2136722222,48.1942,320
90030,979896.61,-89.2106166667,48.1948666667,198
Note that geographic coordinates can also be specified using the format "deg.mm.ss.ss".
See Open/Create Base Station Database for more information on establishing base stations.
Script Notes
Example of a scripted import: the file named "bases.csv" is imported into a base station named "bases.gdb":
SETINI GRLOAD.OUTPUT_DATABASE ="bases.gdb""
SETINI GRLOAD.SOURCE="Text data file""
SETINI GRLOAD.BASE_FILE="bases.csv"
SETINI GRLOAD.LATITUDE="Longitude"
SETINI GRLOAD.LONGITUDE="Latitude"
GX GRBASEDB
GX GRLDBASE
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