3DM AnalystOpen Mine Pit

Measuring System

ADAM Technology wishes to acknowledge Kundana Gold Mining Company

for their assistance in the preparation of this demonstration

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3DM AnalystSoftware Tools for 3D Measurement

The system performs camera calibration and exterior orientation calculations to enable it to create epipolar images which can then be viewed in 3D. The epipolar images are then used to

generate a 3D Digital Terrain Model (DTM). This DTM can be modified and 3D Polylines added. 3D measurements can then be extracted from the data.

Once complete the epipolar images and all of the 3D data can be stored in the job file. The data can also be exported out for further editing and presentation work in other software

packages. The advanced texture mapping capability ensures that the 3D model is accurately represented. This is especially useful for geological observation.

The 3DM Analyst settings can be adjusted to achieve the accuracy required by the user. Typically surface points are measured within an accuracy of around 1/4000th of the size of

the object measured.

The 3DM Analyst is a set of specialised software tools designed to extract accurate 3D spatial measurements of objects by analysing images taken with handheld digital cameras. The 3 dimensional data produced can then be viewed, and edited, with standard stereovision systems (e.g. Stereographics Crystal Eyes or Z Screen, even as a low cost anaglyph).

Suitable photography involves taking a pair of convergent images of the same scene from separate positions. The camera(s) separation depends on the distance of the closest objects in the scene and the degree of stereo one wishes to achieve.

3DM AnalystPhotography

The cameras should be angled inwards, so that the imaginary rays projected into the scene intersect at a depth that is intended to be at the projection plane. Objects that are closer than this

intersection plane will appear to be closer to the viewer, points behind this intersection plane will appear to be further from the viewer.

To provide the most comfortable viewing: A general rule of thumb is for the camera separation to be around 1/20th of the distance where the camera rays intersect (intersection plane).

3DM Analyst

Stereopair images are loaded into the 3DM Analyst.

Left Image loaded Right Image loaded

The exterior orientation of a camera position is defined as the position of the projection centre of the camera in space (X,Y,Z) and 3 rotation angles describing the orientation (direction of the camera axis). Image correlation and centroiding

software is used to assist the operator in viewing the surveyed control points. This greatly improves accuracy and observation speed. The surveyed control points

along with some relative orientation points are then entered into the system.

The camera orientation is created from the bundle adjustment process. The bundle adjustment attempts to best match the image coordinates and the 3D control

locations of the two images.

3DM Analyst

Loading Control and Viewing Relative Orientation Points

After the epipolar resample, which aligns the images for easy stereo viewing, the feature points are calculated. These feature points are then used to generate

the points of a Digital Terrain Model (DTM).

Knowledge of the camera’s orientation ensures that the 3D DTM data generated is in the coordinate system that you have specified.

DTM Points Generation

3DM Analyst

3DM Analyst

Triangular DTM Mesh

A triangular mesh is applied to the model using the calculated DTM points. This gives the surface a viewable shape.

3DM Analyst

Automatic Contour Generation from Triangular DTM Mesh

Contours of a specified height are automatically calculated and can be displayed over the Triangular DTM Mesh.

3DM Analyst

Triangular Mesh and Contours Displayed

The 3D Triangular mesh and Contour display can be viewed and manipulated in 3D.

3DM Analyst

3D View of Model with Texture Mapping

The epipolar image is texture mapped over the 3D Triangular mesh. It too can be viewed and manipulated in 3D.

3DM Analyst

3D View of Model with Contours

Contours of any specified value can be automatically applied to the 3D Model.

3DM Analyst

3D Data Exporting

The 3D data can be exported in .DXF and .MAF formats for use in other software packages.

Viewing objects in 3D makes extracting 3D data easy and accurate.We have implemented support for the Stereographics Crystal Eyes or the Z Screen polarising glasses for stereo viewing. The operator can view the object in 3D, overlay the DTM

points and triangles in 3D, and even drive a floating mark around in 3D using the mouse, adding and deleting points at will.

The Control Point positions in the following model are displayed as X, Y and Z values in the bottom right of the Stereo Display window.

Note: The following images have been presented as an Anaglyph for this presentation. In a working situation the Stereographics stereo viewing system is recommended. To view the model in 3D you

will need to use a pair of Anaglyph glasses (red filter - left eye, blue filter - right eye).

3DM Analyst

3D View of Model with Control Points Displayed

ADAM TechnologySuite 3, 41 Belmont Avenue, Belmont, Western Australia 6104

Post: P.O. Box 283, Cloverdale, Western Australia Ph: + 61 8 9 479 5575 Fax: + 61 8 9 479 5585

Email: adam@adamtech.com.auWeb: www.adamtech.com.au

3DM Analyst 3D Measurement Software

For more information on 3D measurement contact:

End

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