GRAViMAG¶

Web interface¶

GRAViMAG\(^2\) is a web-based application for the processing and interpretation of potential data:

gravity
magnetic
self-potential data.

The GRAViMAG\(^2\) software is opened in a web browser. Simply point the browser to the relevant url. Then, a start screen should be shown:

From this start screen, you can access:

open old projects
create new projects

Create new project¶

we start creating a new project. Under Choose project, we use new to create a new project. Fill in the form, search the location in the map, and save the new project.

The newly created project is opened and the location displayed.

An existing project information can be edited later …

Once the project has been created, we start adding gravity and magnetic data sets.

Gravity data set¶

Under Gravity data, we choose new to create a new gravity data set. We need to label the new data set, then it appears in the dropdown list below. We load this newly created data set.

Note: If the data set has been processed, its data trace is shown in the map view window.

Below the label, several tabs have appeared, which we need to manage the data set:

General
Base
Data
Raw
Process
View
Tides
Export

General¶

This tab holds general information about the data set. Besdies an info string INFO, and the names of the operators OPERATOR, the start time TIME of the data set is given, an offset time relate to GMT time OFFSET, the instrument used INSTRUMENT, a reference density RHO, and the use of an earht tide file TIDES.

The tide file needs to be uploaded first, and is the output of the program eterna34…

Base¶

This tab holds information about the base point.

Here, coordinates, and possibly a known absolute gravity value [mGal], are stored BASE1. If no absolute gravity value is known, the value -1 indicates that absolute gravity is calculated grom the geoid.

Then the repeted measurements of the base points are listed DRIFT1.

Data¶

This tab holds information about the data points.

Here, we can upload the file exported from the CG-6 gravimeter. To accomplish this, we first iuse Delete all data to clear the table, then use Import (CG-6 format) to import the gravity data.

If we have already processed the accurate coordinates and elevations, we can swap them with the reading from the gravimeter, using Replace coordinates.

Raw¶

This tab lists the information from the input tabs in an ascii format, usable for external processing…

Process¶

This tab is used to process the information entered. If the input tabs has been entered correctly, a log file will be shown …

View¶

In this tab, the processed Bouguer anomaly can be visualised as a line plot.

Tides¶

In this tab, the loaded Earth tides can be visualised as a line plot.

Export¶

In this tab, the processed Bouguer gravity data can be exported into the geodyn format.

Magnetic data set¶

Under Magnetics data, we choose new to create a new magnetics data set. We need to label the new data set, then it appears in the dropdown list below. We load this newly created data set.