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Review of Case Materials
Reviews records, documents, testimony, data, and other relevant materials and consults with counsel regarding technical issues related to the matter.
Provide Expert Analysis
Applies specialized knowledge and experience to evaluate the technical or professional issues involved.
Form Expert Opinions
Develops independent, supportable opinions based on the available evidence and relevant standards.
Prepare Expert Reports
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Photogrammetry uses image geometry and identifiable points within photographs to derive spatial information about objects or surfaces. When overlapping images capture the same feature from different positions, an expert can use those relationships with camera information, scale, coordinates, or ground control to calculate measurements and reconstruct three-dimensional geometry. ASPRS defines photogrammetry around recording, measuring, and interpreting imagery to obtain reliable information about physical objects and the environment.
Accuracy can depend on image resolution, camera calibration, viewing geometry, overlap, ground control, coordinate systems, image quality, processing methods, and the distribution of reference points. An expert may also examine whether the claimed accuracy is consistent with the source imagery and intended use of the resulting product. Current ASPRS positional-accuracy standards include specific guidance for photogrammetry and other geospatial methods.
Historical and current imagery can be aligned and measured to examine changes in position, dimensions, terrain, structures, or surface features over time. The expert may compare camera perspectives, image scale, control information, dates, and identifiable common features before drawing conclusions. This type of analysis can be useful when the timing or extent of a physical change is disputed.
Useful materials can include original image files, metadata, camera and lens information, calibration records, flight or acquisition information, ground-control coordinates, processing settings, project files, point clouds, orthomosaics, elevation models, and any measurements derived from the imagery. Preserving the source files and processing history can make it possible to reproduce or test the reported result rather than relying only on a finished image or 3D model.
Prepares clear, well-supported expert reports outlining methodology, analysis, findings, and opinions.
Provide Deposition Testimony
Explains findings and opinions under oath and responds to questioning during deposition testimony.
Testify in Court
Presents specialized findings and opinions clearly to judges, juries, arbitrators, or other decision-makers.
