Spatial data and information processing for geomodeling

Overview

We attempt to simplify the access to open-source spatial data processing for geological modeling with the development of GemGIS, a Python-based open-source library.

GemGIS wraps and extends the functionality of packages known to the geo-community such as GeoPandas, rasterio, OWSLib, Shapely, PyGEOS, PyVista, Pandas, NumPy and the geomodeling package GemPy.

The aim of GemGIS, as indicated by the name, is to become a bridge between conventional geoinformation systems (GIS) such as ArcGIS and QGIS, and geomodeling tools such as GemPy, allowing simpler and more automated workflows from one environment to the other.

Resources

Find the documentation of GemGIS here. It includes introductions to the main libraries used and to introductory topics like "What is vector data?" or "What is raster data?".

In addition, tutorial notebooks provide an overview of the different features of GemGIS. The notebooks can also be downloaded directly from here.

Installation

It is recommended to use GemGIS with python==3.9 in a separated environment. The main packages and its dependencies can be installed via the conda-forge channel. GemGIS is then available through PyPi.

1. conda install -c conda-forge pygeos
2. conda install -c conda-forge geopandas
3. conda install -c conda-forge rasterio
4. conda install -c conda-forge pyvista
5. pip install gemgis / conda install -c conda-forge gemgis

Check out the Installation Page for more detailed instructions.

References

• Jüstel, A., Endlein Correira, A., Wellmann, F. and Pischke, M.: GemGIS – GemPy Geographic: Open-Source Spatial Data Processing for Geological Modeling. EGU General Assembly 2021, https://doi.org/10.5194/egusphere-egu21-4613, 2021
• Jüstel, A.: 3D Probabilistic Modeling and Data Analysis of the Aachen-Weisweiler Area: Implications for Deep Geothermal Energy Exploration, unpublished Master Thesis at RWTH Aachen University, 2020
• de la Varga, M., Schaaf, A., and Wellmann, F.: GemPy 1.0: open-source stochastic geological modeling and inversion, Geosci. Model Dev., 12, 1-32, https://doi.org/10.5194/gmd-12-1-2019, 2019
• Powell, D.: Interpretation of Geological Structures Through Maps: An Introductory Practical Manual, Longman, pp. 192, 1992
• Bennison, G.M.: An Introduction to Geological Structures and Maps, Hodder Education Publication, pp. 78, 1990

Gallery

Working with Vector Data

Extracting XY values from Vector Data	Extracting XYZ values from Vector Data

Exploding Geometries/Vector Data	Clipping/Cropping Vector Data

Interpolating Vector Data to Rasters	Removing Interface Points within Fault Buffers

Extracting Interface Points and Orientations from Geological Cross Sections	Extracting Interface Points from Geological Maps

Creating Orientations from Isolines on maps	Calculating Orientations from Strike Lines

Delaunay triangulation for isoline maps	Delaunay triangulation of Shapely MultiPoints

Working with Raster Data

Sampling from Rasters	Sampling Interfaces and Orientations from Rasters

Calculating Raster Properties	Additional Raster Operations in GemGIS

Working with PolyData and Grids/Meshes in PyVista

Visualizing Spatial Data with PyVista	Visualizing Topography and Maps with PyVista

Visualizing Geological Cross Sections with PyVista	Creating Depth Maps from GemPy Models

Creating Temperature Maps from GemPy Models	Calculating Thickness Maps from GemPy Models

Visualizing Borehole Data	Draping Vector Data over Elevation Model

Working with Online Services

Working with Web Map Services - WMS	Working with Web Feature Services - WFS

Working with Web Feature Services - WFS

Parsing data formats

Opening Leapfrog Meshes and GoCad TSurfaces	Opening OBJ and DXF Files with PyVista in GemGIS

Opening GeoDataBases for GemGIS	Parsing Leapfrog Wells

Working with GPX Data	Working with KML Data

Opening ESRI ASC Grids and ZMAP Grids	Working with HGT Files

Additional Functionality

Plotting Orientations with mplstereonet	Plotting Hypocenters of Earthquakes with PyVista

Working with Well Data from the Geological Survey NRW	Parsing QGIS Style File to GemGIS

Obtaining City Locations	Creating proj.crs.crs.CRS Objects for GemGIS

Fitting plane through earthquake hypocenters	Georeferencing Rasters using Rasterio

Slicing GemPy Lith Blocks	Assigning physical properties to lith block

Creating LineStrings from PyVista Contour Lines

Examples

Example 1 - Planar Dipping Layers	Example 2 - Planar Dipping Layers

Example 3 - Planar Dipping Layers	Example 4 - Unconformably Dipping Layers

Example 5 - Folded Layers	Example 6 - Unconformably Folded Layers

Example 7 - Folded Layers	Example 8 - Faulted Dipping Layers

Example 9 - Faulted Dipping Layers	Example 10 - Faulted Folded Layers

Example 11 - Horizontal Layers Layers	Example 12 - Three Point Problem

Example 13 - Three Point Problem	Example 14 - Three Point Problem

Example 15 - Three Point Problem	Example 16 - All features

Example 17 - Three Point Problem	Example 18 - Faulted Folded Layers

Example 19 - Faulted Folded Layers	Example 20 - Sill

Example 21 - Coal Seam Mining	Example 22 - Coal Measures