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GeoModeller User Manual Tutorial case study D (GIS import) 1

Contents | Help | Top | Back | Tutorial case study D (GIS import)Parent topic: 3D GeoModeller User Manual and Tutorials

Author: Desmond Fitzgerald, Intrepid Geophysics

Editor: Claire Edwards, Intrepid Geophysics

Update V2012: Stewart Hore

In this case study:

Tutorial D1GIS import

Tutorial D1GIS importParent topic: Tutorial case study D (GIS import)

Making use of existing 2D maps, Arc Shape files, etc.

In this tutorial:

D1 Tutorial Overview D1 Stage 1Start the project, define properties, choose projection and load DTM D1 Stage 2Open points list editor and import shape files D1 Stage 3Add geological formation A1 and assign shape as a boundry for this unit D1 Extensions to Geophysics

D1 Tutorial OverviewParent topic: Tutorial D1GIS import

Prior interpretations of Geology captured in GIS This takes the form of many parts such as

Solid geology Dykes Faults

Commonly in attributed shape files We wish to review this information in the context of building a 3D model, but only that which

falls within the project box May have to convert the projections May have to weed or thin the line work as it is overspecified for what it is May have to do some graphical adjustments before acceptance into the model This data has to have added input from the user as to exactly what it represents in a

3DGeomodel contextSolution Bring GIS data into the Plan view Points Editor Only show the data that falls in the project box - clip to the edges Allow the User to edit/review and then classify exactly what the GIS data represents

Geology boundary Fault

Commit new data to the modelContents | Top 2012 Intrepid-Geophysics & BRGM | Back |


Contents | Help | Top | Back |

Bowen Basin Example 2003 study area, approximately 200 * 200km in Queensland Compliation of all geophysics, topography Interpreted geology, faults, dykes, anomalies Mostly captured in ArcShape files with Coordinate System of GDA94/Map Grid of Australia,

Zone 55Stages of the tutorial D1 Stage 1Start the project, define properties, choose projection and load DTM D1 Stage 2Open points list editor and import shape files D1 Stage 3Add geological formation A1 and assign shape as a boundry for this unit

D1 Stage 1Start the project, define properties, choose projection and load DTM Parent topic: Tutorial D1GIS import

D1 Stage 1Steps1 Create a project with the following parameters:

Name: TutorialD (Note: No spaces!) Authors: your name Description: a comment of your choice Projection: GDA94/MGA zone 55 Unit: m Geographical area:

XMin = 600000. XMax = 650000. YMin = 7550000. YMax = 7600000. ZMin = 9000. ZMax =1000

.

Choose menu option Project > New. 3D GeoModeller displays the Project properties dialog box. Complete the fields as given above and choose OK. 3D GeoModeller displays the Project creation successful dialog box.Contents | Top 2012 Intrepid-Geophysics & BRGM | Back |



2 Load DTM with paremameters as shown below.

Create topographic surface From a DTM with the following properties: Name: Topography Filename:

GeoModeller\tutorial\CaseStudyD\TutorialD1\Data\dtm2.ers Description: a comment of your choiceChoose From a DTM in the Project creation successful dialog box. 3D GeoModeller displays the Load topography from an ASCII grid dialog box.Enter the Name and Description fields as shown above and choose Browse to navigate to GeoModeller\tutorial\CaseStudyD\TutorialD1\Data\dtm2.ersChoose OK.3D GeoModeller opens a 3D Viewer, which shows the bounding box of your project.

3 Save the project. From the main menu, choose Project > Save As, navigate to the directory where you want to save your work, assign a project name and save.Note that a completed version of the tutorial is available in GeoModeller\tutorial\CaseStudyD\TutorialD1\Completed_Project\ TutorialD1.xml. Do not overwrite it.

D1 Stage 2Open points list editor and import shape files Parent topic: Tutorial D1GIS import

D1 Stage 2Steps1 Bring up the points list editor, expand to full table view and open a shape file using the file

import option.

On the Points List Editor toolbar choose Float or dock the Points List Editor .From the Show Points List information or table menu in the toolbar choose Table .Contents | Top 2012 Intrepid-Geophysics & BRGM | Back |



From the toolbar select Show shape file input .

Choose Browse and navigate to GeoModeller\tutorial\CaseStudyD\TutorialD1\Data\interp\ geology_solid.shp

Choose Open

Dock the points list editor by clicking on Float or dock the Points List Editor .D1 Stage 3Add geological formation A1 and assign shape as a boundry for this unit Parent topic: Tutorial D1GIS import

D1 Stage 3Steps1 Create a geological formation with the following parameters:

Name: FormationD Colour: Light blue (RGB 0; 255; 255)Choose main menu option Geology > Formations > CreateEdit. In the CreateEdit geology formations dialog box, use the following sequence: Enter the Name. Specify the Colour (Double click the Colour field and select the colour from the palette.

Use the RGB tab if you want to get it exact, but this is not essential). Choose Add.Choose Close when finished.Contents | Top 2012 Intrepid-Geophysics & BRGM | Back |



2 Assign shape as a boundary for FormationD:In the Structural toolbar, choose Create geology data . FormationD will be selected in the Geological Formations and Faults menu box as it is the only formation/faultChoose Create and then Close. The shape should now be blue.

3 Add a second shape with high threshold and assign the shape to FormationD.

From the Points List Editor toolbar choose Float or dock the Points List Editor .Enter 16 into the Segment field and press Enter.Set the Treshold level to High using the threshold slider (See below). There should now be 50 points in the points list.

Choose Float or dock the Points List Editor to dock the points list editor.

From the Structural toolbar, select Create geology data . FormationD will be selected in the Geological Formations and Faults menu box. Choose Create and then Close. The second shape should now be blue.

D1 Stage 3Threshold discussionThe Threshold slider bar is used for weeding out unnecessary precision in the representation of the shape. Low threshold includes all original points, while high threshold gives about one third of the points without generally degrading the shape too much.

D1 Stage 3General Comments This scheme relies on reliable geolocation of all your spatial data from different sources Full projection and datum conversion facilities, are provided to do the on-the-fly changes Can be used for ASCII csv files, Intrepid line and point datasets, Geosoft gdb. Is extensible to MapInfo with some work on a driver Only proven for ArcShape files as yetContents | Top 2012 Intrepid-Geophysics & BRGM | Back |


Contents | Help | Top | Back | D1 Extensions to GeophysicsParent topic: Tutorial D1GIS import

Euler This scheme has potential for Euler Clustered Depth Estimates to be managed in a Plan View

Threshold changed to pick on reliabilityGeophysics Flight LineProfile/Sections One could easily imagine selected flight lines from an airborne survey

Each line has a Geomodeller section These sections generated automatically A method such as Naudy giving possible 2D magnetric Dykes, dip, width and

susceptibility Threshold used to control Similarity

Image ProcessingGeophysical Grid Enhancements An additional layer in the plan view to cover the basic rendering and stretching of normal

geophysical grid data sets Not just the import of a jpeg image

A rapid depth estimator, such as "PotentQ" under control of the user for points of interestContents | Top 2012 Intrepid-Geophysics & BRGM | Back |

Tutorial case study D (GIS import)Tutorial D1-GIS importD1 Tutorial OverviewD1 Stage 1-Start the project, define properties, choose projection and load DTMD1 Stage 2-Open points list editor and import shape filesD1 Stage 3-Add geological formation A1 and assign shape as a boundry for this unitD1 Extensions to Geophysics

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