Stereo Compilation & 3D Modeling Flashcards
6 cards from real Certified Photogrammetrist practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 Stereo Compilation & 3D Modeling flashcards as text
What is 'relief displacement' in aerial photography?
Answer: The shift of elevated objects outward from the nadir point on a vertical photograph
Relief displacement is the radial outward shift of elevated objects from the nadir point on a vertical aerial photograph, caused by the perspective projection of terrain relief.
What is a TIN (Triangulated Irregular Network) in 3D modeling?
Answer: A surface model composed of irregular triangular facets connecting measured mass points and breaklines
A TIN is a vector-based surface model made of irregular triangular facets connecting measured points and breaklines, faithfully representing terrain morphology including sharp features like ridges.
What is 'breakline' collection in stereo compilation?
Answer: Collecting linear features (ridgelines, drainage lines, roads edges) that define sharp changes in terrain slope for accurate TIN and DEM generation
Breaklines are collected along ridges, streams, road edges, and other features representing abrupt slope changes, ensuring that TINs and DEMs accurately model terrain discontinuities.
What is 'mass point collection' in stereo compilation?
Answer: The systematic collection of random elevation measurements across the terrain to support TIN and DEM generation
Mass point collection involves systematically measuring a large number of random elevation points across the terrain, providing the raw data needed to build an accurate TIN or DEM surface model.
In 3D city modeling, what is 'Level of Detail' (LOD) as defined by CityGML?
Answer: A hierarchical scale of model complexity, from simple block models (LOD1) to fully textured models with interior detail (LOD4)
CityGML defines LOD (Level of Detail) as a hierarchy from LOD0 (footprint) through LOD1 (block), LOD2 (roof structures), LOD3 (facades), to LOD4 (interior elements), reflecting increasing geometric complexity.
What is 'image rectification' in the photogrammetric workflow?
Answer: Transforming an image to remove tilt distortion so it appears as if taken from directly above (nadir)
Image rectification transforms a tilted aerial photograph to remove tilt effects, producing an image that appears as if taken from directly above—a prerequisite for creating orthophotos.
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