Photogrammetric Product Generation 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 Photogrammetric Product Generation flashcards as text
What is the relationship between flying height (H), focal length (f), and image scale (1/S) in aerial photography?
Answer: Scale = f / H (image scale denominator S = H/f)
Image scale is f/H: a 152 mm focal length camera at 3,048 m flying height produces a 1:20,000 scale image, as scale = f/H = 0.152/3048 = 1/20,000.
What is 'map generalization' in the context of photogrammetric mapping?
Answer: The process of simplifying and selecting map features appropriate for the target map scale
Map generalization involves selecting, simplifying, and symbolizing features at a level of detail appropriate for the output map scale, since not all detail captured at the source GSD can be shown on a smaller-scale map.
What is 'pansharpening' in multispectral photogrammetric products?
Answer: Fusing a high-resolution panchromatic image with lower-resolution multispectral bands to produce a high-resolution color image
Pansharpening fuses a high-spatial-resolution panchromatic (greyscale) image with coarser-resolution multispectral bands to produce a sharp, full-color image at the panchromatic resolution.
What accuracy class does ASPRS 2014 assign when RMSEz of a DEM equals 10 cm?
Answer: The DEM meets accuracy for products with 10 cm Non-Vegetated Vertical Accuracy (NVA)
Under ASPRS 2014, a DEM with RMSEz = 10 cm has a Non-Vegetated Vertical Accuracy (NVA) of approximately 19.6 cm (95% confidence), placing it in the accuracy class for products with 10 cm NVA.
What is the purpose of 'edge enhancement' in photogrammetric image processing?
Answer: To sharpen boundaries between land cover classes for improved visual interpretation and feature extraction
Edge enhancement sharpens boundaries between features in imagery—such as roads, building edges, and field boundaries—improving visual clarity and automated feature extraction.
What is a 'digital terrain model' (DTM) compared to a 'digital elevation model' (DEM)?
Answer: DTM includes breaklines and mass points (vector + raster hybrid) representing the bare-earth terrain; DEM is often used as a generic term for any elevation raster
A DTM includes both the raster elevation grid and vector elements (breaklines, mass points) representing bare-earth terrain features; DEM is often used generically for any elevation raster, including DSMs.
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Sources & references
Exam facts on this page (fees, format, dates, passing scores) are checked against these official sources; the date is our last check. Editorial policy
- asprs.org — Test delivery, eligibility, fees, registration deadline, retake fee, retake policy, score release, time limit, score validity · verified Nov 2026
- prometric.com — Registration · verified Nov 2026