From 5c9f6300eff440aad65dff5613fd34c1052ab19f Mon Sep 17 00:00:00 2001 From: Santiago Soler Date: Mon, 2 Jun 2025 09:25:04 -0700 Subject: [PATCH] Add admonition to clarify the sign of the gz in gravity inversion --- .../03-gravity/inv_gravity_anomaly_3d.ipynb | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) diff --git a/notebooks/03-gravity/inv_gravity_anomaly_3d.ipynb b/notebooks/03-gravity/inv_gravity_anomaly_3d.ipynb index b62d36a..99b53f4 100644 --- a/notebooks/03-gravity/inv_gravity_anomaly_3d.ipynb +++ b/notebooks/03-gravity/inv_gravity_anomaly_3d.ipynb @@ -383,6 +383,23 @@ "The SimPEG [Data](xref:simpeg#simpeg.data.Data) class is required for inversion and connects the observed data, uncertainties and survey geometry." ] }, + { + "cell_type": "markdown", + "metadata": { + "execution": { + "iopub.execute_input": "2025-06-02T16:23:34.738628Z", + "iopub.status.busy": "2025-06-02T16:23:34.738355Z", + "iopub.status.idle": "2025-06-02T16:23:34.744628Z", + "shell.execute_reply": "2025-06-02T16:23:34.743489Z", + "shell.execute_reply.started": "2025-06-02T16:23:34.738604Z" + } + }, + "source": [ + ":::{important}\n", + "SimPEG uses a right-handed xyz coordinate system in which the z axis points _upward_. When defining the `Data` object for a gravity inversion we must check that the `dobs` array contains the **upward** component of the gravity acceleration due to anomalous bodies.\n", + ":::" + ] + }, { "cell_type": "code", "execution_count": 8,