3-D fence diagrams

The fence diagram is the natural first step into 3-D: each survey line is drawn as a vertical cross-section (“fence panel”) hanging at its true map position, so you see all five WILLY_DATA lines together in one rotatable scene. It is the most faithful 3-D view of raw survey data — no volumetric interpolation between lines, just the real per-line pseudo-sections placed in space.

Drag to orbit the scene, scroll to zoom, and hover any panel for its resistivity and depth.

Load the survey

import os

from pycsamt.map import MapView


DATA = os.path.join(
    os.environ.get("PYCSAMT_DOCS_REPO_ROOT", "."), "data", "AMT", "WILLY_DATA"
)
mv = MapView.from_folder(DATA, recursive=True)
print(f"{mv.n_stations} stations across {len(mv.lines)} lines")

53 stations across 2 lines

The fence

MapView.map3d with mode="fence" builds one panel per line. Colour is apparent resistivity; the vertical axis is pseudo-depth from the period-to-depth transform.

fig = mv.map3d(mode="fence")
fig.update_layout(height=640, scene_aspectmode="cube")
fig

Add the stations

show_stations=True drops a marker at every station on top of the panels, tying the 3-D fence back to the plan-view survey geometry.

fig = mv.map3d(mode="fence", show_stations=True, station_size=3)
fig.update_layout(height=640, scene_aspectmode="cube")
fig

Phase fence

The same fence keyed on phase rather than resistivity — useful for cross-checking conductor positions between the two quantities in 3-D.

fig = mv.map3d(mode="fence", quantity="phase")
fig.update_layout(height=640, scene_aspectmode="cube")
fig

Constrain the colour range

Passing an explicit rho_range fixes the colour scale across a survey, so several fences (or several surveys) are directly comparable rather than each auto-scaling to its own extremes.

fig = mv.map3d(mode="fence", rho_range=(1.0, 1000.0))
fig.update_layout(height=640, scene_aspectmode="cube")
fig

Next. A fence shows the measured lines only. The volume, block, and depth views interpolate between the lines to fill a continuous 3-D resistivity body.