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Magnetometer Viewer

The magnetometer viewer is the core analysis tool for TreasureHunter3D and FG Sensors DIY Gradiometer Kit files. After opening a scan you can switch between four view modes using the toolbar at the top of the page.

Uploading a scan​

  1. Go to Magnetometer under Instruments in the left navigation.

Dashboard — click Magnetometer in the left sidebar

  1. Click Select File or drag-and-drop your file onto the scan table.

Magnetometer Library — click Select File to upload your scan

  1. Choose your device type from the dropdown, or leave it unset for automatic detection. Keep the original filename intact — the platform uses it to identify the device.

Upload dialog — select device type and choose your file

  1. Click Upload — 25 credits are charged. The scan appears in the table within a few seconds to a minute.

Data Library after successful upload

  1. Click the row to open the viewer. It opens in 3D mode by default, with the 1D profile chart below.

View modes​

View mode buttons — 1D, 2D, 3D, Maps

1D — Profile chart​

The 1D view shows your scan as a line graph. The horizontal axis represents position along the scan path and the vertical axis shows signal intensity. The unit depends on your device:

DeviceUnit
TreasureHunter3DSignal strength (–1 to 1)
FG Sensors DIY Gradiometer KitSignal strength (–1 to 1)
PolarWave DroneRover (Survey)nanoTeslas (nT)
FG Sensors FGA Logger (Survey)nanoTeslas (nT)

Click on the 1D graph to place a tag on a point of interest — tags are saved with the scan and appear in your PDF report.

Use the mouse wheel to zoom, click-and-drag to pan. Double-click to reset the view.

Controls in the 1D view:

ControlWhat it does
Magnet TypeSelect single-axis, dual-axis, or total field display
Metrics TypeChoose the measurement to display (total field, gradient, etc.)
DecimationThin out the data for faster display of large files
InterpolationEven out the data to a consistent resolution
AmplificationScale up values to make subtle anomalies more visible
SmoothingReduce noise to reveal the underlying signal shape
DetrendRemove slow baseline drift across the scan
Baseline RemovalCenter the signal around zero
SensitivityAdjust the color scale range in 2D and 3D views

2D — Heatmap​

The 2D view renders your scan as a color-coded grid. Rows represent individual scan lines and color represents signal intensity. The same filter controls apply here. Use the Sensitivity slider to bring weak anomalies into the visible range.

Annotations in 2D:

  1. Click and drag on the grid to draw a rectangular region over an anomaly.
  2. A dialog will appear asking you to name the region.
  3. Annotations are saved automatically and appear in your PDF report.

3D — Surface plot​

The viewer opens in 3D mode by default. The 3D view renders your data as an interactive three-dimensional surface showing anomaly depth and shape — peaks and troughs represent magnetic field variations across the scanned area.

3D surface viewer — interactive render of magnetic data

ControlWhat it does
RotateClick and drag to spin the model from any angle
ZoomScroll up/down
PanRight-click and drag (or two-finger trackpad)
TagsClick on the surface to place a marker on a point of interest

Maps — Satellite overlay​

The Maps view displays your scan overlaid on a live satellite or street map using the GPS coordinates recorded during the survey.

Map view — scan overlaid on satellite imagery

When you first switch to Maps view, a GPS track line appears. Enable Gridding in the right-hand panel to interpolate your survey data across the surveyed area, turning the raw track into a filled colour map.

Gridding toggle in the right-hand panel

:::info GPS required The Maps view requires GPS data embedded in your file. Confirm GPS logging was active during your survey. If you are unsure, open the file in a text editor and look for latitude/longitude columns near the top. :::

Patchy or blank areas in the grid usually mean survey lines were spaced too far apart — tighter line spacing produces a smoother, more complete grid.

Toolbar​

ButtonAction
1D / 2D / 3D / MapsSwitch view mode
ReportOpen the report preview for this scan
Download CSVExport the processed data

Working with multi-axis devices​

Devices with 2 or 3 magnetometer axes produce separate channels for each direction. Use the Magnet Type selector to switch between:

  • Single axis — vertical component only
  • Dual axis — horizontal and vertical
  • Total field — combined field strength from all axes

The total-field view is usually the most useful for locating buried ferrous objects.

Tips for finding anomalies​

  1. Apply Detrend first — regional geomagnetic gradients create slow baseline drift that can hide local anomalies.
  2. Increase Amplification until anomalies stand out from the background.
  3. Use Smoothing to reduce noise if the signal is very erratic.
  4. Switch to 2D to see the spatial extent of an anomaly across multiple scan lines.
  5. Use the Maps view to locate anomalies geographically — enable Gridding for a filled colour overlay.
  6. Use Tags and Annotations to mark anomaly positions before generating your report.

Filter persistence​

All filter settings are saved automatically per scan. When you return to a scan your last configuration is restored. To start fresh, click the Reset Filters button in the filter panel.

Next steps​