Geological Mapping Case Study
Conversion of Geological Cross Sections and Surface Maps
Background and Objectives
The client is a leading exploration company based in Australia and has executed several projects in North America and Australia. They work on a business model that combines technology with 3D Geosciences to increase the rate of discovery in sub-surface exploration.
Key Aspects of the Project
- Two types of projects were executed, namely, conversion of geological cross sections and interpretation surface maps. The former was part of a regional study conducted by the client, involving digital data compilation and regional/terrain-scale geological modeling. The end objective is identifying areas of prospective world-class deposits.
- The latter was part of a larger project implemented by the client that involved the collection, integration and validation of a large amount of data. The end objective is in building a new suite of geological interpretations and 3D models for the region.
Services Rendered and Methodology
-
Geological Cross Sections
Scans of cross-sections with registration points were used as input data.
The scope of work involved the following activities:- Registration of image
- Digitization of linework based on pre-defined criteria
- Creation of polygons
- Color-filling and splitting onto unique - levels
- Conversion of 2D sections to 3D
- Splitting of files into linework and polygons
-
Deliverables
- Output files in MicroStation .dgn format
- Excel spreadsheet detailing level information
-
Surface Maps
A0 scans of surface maps were used as input data for digitization.
The scope of work involved the following activities:- Creation of Level Structure for the Line and polygon Codes based on legend provided
- Import of registration reference file into the image registration software
- Registering of scans using outline of the reference file
- Digitization of all Line work on individual scans and level structuring in Microstation
- Export the existing Line work from MapInfo to Microstation
- Edge Matching of digitized scans with adjacent scans and with imported line work from MapInfo
- QC of Line Work
- Delivery of individual and edgematched line work files in .DGN
- Merging individual digitized line work files as a single file
- Polygon creation, Layerization and color filling in Microstation
- QC of Polygons
- Delivery of merged line work and polygon files in .DGN
- Export Line Work and Polygon Files to MapInfo
- Populating columns and color mapping of line and polygon files
- Delivery of merged line work and polygon files in MapInfo
-
Deliverables
- 2D MicroStation files
- Excel level sheet for MicroStation files
- MapInfo files
Tools used:
- MicroStation J
- MapInfo
- ArcMap
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Enterprise Integration and Photogrammetry - specializing in topographical,
parcel and cadastral mapping, orthophoto generation and rectification,
aerial triangulation, contour generation etc covering the complete terrain
in GIS systems.