Mapping in Photogrammetry

What is the primary purpose of aerial mapping techniques in photogrammetry?

• To predict weather patterns in the atmosphere

• To study marine life in the ocean depths

• To analyze seismic activity in the Earth's crust

• To create accurate and detailed maps or models of the Earth's surface.

Explain the process of generating an orthophoto in photogrammetry.

• Generating a DSM, then converting it to a 3D model

• Skipping the distortion correction step

• The process involves collecting aerial images, creating a DSM, correcting distortions, and orthorectifying the images.

• Using satellite images instead of aerial images

How are digital elevation models created in photogrammetry?

• Directly measuring elevation on the ground

• Using satellite images to create 2D maps

• Converting physical models into digital format

• Processing overlapping aerial images to generate 3D point clouds

Why is camera calibration important in photogrammetry?

• Camera calibration corrects distortions in images and provides parameters for accurate measurements and reconstructions.

• Camera calibration is only relevant for video recording in photogrammetry

• Camera calibration causes image distortions in photogrammetry

• Camera calibration is unnecessary in photogrammetry

What is the significance of feature extraction from images in photogrammetry?

• Feature extraction causes distortion in images

• Feature extraction only works for 2D images

• Feature extraction is irrelevant in photogrammetry

• Feature extraction helps in identifying key points or landmarks in images that are essential for creating accurate 3D models in photogrammetry.

Name one common aerial mapping technique used in photogrammetry.

• Aerial mapping

• Aerial triangulation

• Satellite imaging

• Ground surveying

What are the key steps involved in the generation of an orthophoto?

• Satellite imagery acquisition, Image preprocessing, Digital elevation model (DEM) generation, Orthorectification, Mosaicking of orthorectified images

• Ground-based imagery acquisition, Camera calibration, Image preprocessing, Digital terrain model (DTM) generation, Orthorectification, Mosaicking of orthorectified images

• Aerial imagery acquisition, Camera calibration, Image preprocessing, Digital terrain model (DTM) generation, Orthorectification, Mosaicking of orthorectified images

• Aerial imagery acquisition, Camera calibration, Image enhancement, Digital terrain model (DTM) generation, Orthorectification, Mosaicking of orthorectified images

Discuss the role of digital elevation models in photogrammetry.

• Digital elevation models are primarily used for weather forecasting in photogrammetry

• Digital elevation models are not used in photogrammetry

• Digital elevation models are only used for 2D mapping in photogrammetry

• Digital elevation models provide topographic information essential for accurate 3D reconstruction and elevation measurements in photogrammetry.

How does camera calibration affect the accuracy of photogrammetric measurements?

• Camera calibration has no impact on the accuracy of photogrammetric measurements

• Camera calibration decreases the accuracy of photogrammetric measurements by distorting the images

• Camera calibration only affects the color accuracy of photogrammetric measurements

• Camera calibration improves the accuracy of photogrammetric measurements by providing correct internal camera parameters.

List some methods used for feature extraction from images in photogrammetry.

• KAZE

• FAST

• BRISK

• SIFT, SURF, ORB, Harris Corner Detection