Tutorial: Processing gravity data with Harmonica
Santiago Soler, Andrea Balza Morales and Agustina Pesce
BEFORE THE TUTORIAL:
Please go to https://github.com/fatiando/transform21 and follow the setup instructions.
ABSTRACT
In this tutorial, we'll take a tour around Harmonica https://www.fatiando.org/harmonica, a Python library for forward modeling, inversion, and processing gravity data, focusing on the processing workflow. We will start with a real dataset of scattered gravity observations and finally produce a regular grid of the Bouguer gravity disturbance. We will accomplish this by following these steps:
1. Load the gravity dataset.
2. Compute gravity disturbance by removing the normal gravity through Boule.
3. Project** the data to plain coordinates.
4. Load the survey area's digital elevation model (DEM).
5. Compute Bouguer gravity disturbance by forward modeling the topography with prisms.
6. Interpolate the Bouguer gravity disturbance onto a regular grid at a constant height through the equivalent layer technique.
7. Obtain the Bouguer gravity disturbance on a profile using the same equivalent layer.
TIMESTAMPS
00:00 Matt's intro
01:10 Tutorial introduction
02:11 Setup your system
05:34 What is Harmonica?
07:16 Roadmap
10:37 Import packages
13:13 Download the gravity dataset
22:11 Project the data into plain coordinates
27:55 Understanding the data
29:39 Compute gravity disturbance
38:19 Compute Bouguer gravity disturbance (model the topography with prisms)
01:07:48 Compute residuals (remove regional trend)
01:14:45 Grid the residuals with equivalent sources (a.k.a. equivalent layer)
01:34:00 Extract a profile
01:43:21 Saving results as open-format files
01:45:39 Wrap up
IMPORTANT
Please note that this tutorial was created with the following dependencies:
dependencies:
python==3.8.*
numpy
pandas
xarray
matplotlib
jupyterlab
proj
pyproj
netcdf4
Fatiando a Terra libraries
pooch
verde
boule==0.2.0
harmonica==0.2.1
You can find the complete list in the environment.yml file located at
https://github.com/fatiando/transform...
Over time the syntax could change. Check the repository for notices, more information, and more recent versions.
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