Glossary

3D CARS common words and shortened terms are detailed here.

To update, follow glossary sphinx documentation in RST source documentation.

CARS

means CNES Algorithms to Reconstruct Surface (ou Chaîne Automatique de Restitution Stéréoscopique en français)

core

Means the internal CARS function used as the engine core for steps and pipelines.

disp

The short version of “disparity”

disparity

The column difference between a pixel in the left image and its homologous pixel in the right image.

DEM

Digital Elevation Model. Usually means all elevation models in raster: DSM, DTM,…

DSM

Digital Surface Model. Represents the earth’s surface and includes all objects on it. CARS generates DSMs. See Digital Elevation Model

DTM

Digital Terrain Model. Represents bare ground surface without any objects like plants and buildings You need another tool to generate DTM from CARS DSM. See Digital Elevation Model

epi

A shortened version for “epipolar”. Simplify length of functions in CARS code.

epipolar

Refer to epipolar geometry used as basis for CARS 3D pipeline.

matching

Stereo matching or disparity estimation is the process of finding the pixels in the multiscopic views that correspond to the same 3D point in the scene.

OTB

Orfeo Toolbox is an open-source project for state-of-the-art remote sensing applications.

pipeline

In computing, a pipeline, also known as a data pipeline is a set of data processing elements connected in series, where the output of one element is the input of the next one. In CARS, pipeline orchestrates applications/functions to chain 3D steps to produce DSM.

rectification

Image rectification is a transformation process used to project images onto a common image plane. In CARS, the epipipolar geometry rectification is used.

ROI

Region of Interest means a subpart of the DSM raster in CARS. It can be defined by a file or a bounding box.