3D Photogrammetry Mapping Capabilities
3D digital terrain model allows for:
- Measuring. Photogrammetry can be used to take before and after measurements and monitor the differences. Measurements include:
- Discontinuities. Examples of measuring joints and shears in a rock foundation include Pathfinder Dam, Glendo Dam , Morman Island Auxiliary Dam.
- Volumes of material (e.g., borrow quantities). At Minidoka, we measured the volume in an area that needed additional excavation to determine the volume of concrete needed to fill the hole.
- Concrete deterioration quantification
- Thickness contours (for example,shotcrete thickness)
- Topographic Contour Generation. All photogrammetry models generate a detailed digital terrain model (DTM), which is a 3D surface that can be used to rapidly generate cross sections, areas, volumes, and other measurements. A typical two-photo photogrammetry model will have over 100,000 points for a three-dimensional model. These data can be used in many ways, for example:
- 3D Modeling
- 3D surfaces (which are compatible with Civil 3D, ARC-GIS)
- Orthophotos (orient photos to a map)
- Geologic Mapping and Foundation Documentation
- Structure Deflection Movement of structures (for example spillways)
- Embankment Deformation
- Concrete Dam Deformation
- Dam Removal Sedimentatio