Certified Photogrammetrist Photogrammetric Product Generation 3

Question 1

What is the relationship between flying height (H), focal length (f), and image scale (1/S) in aerial photography?

Accepted Answer

Scale = f / H (image scale denominator S = H/f)

Answer

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.

Question 2

What is 'map generalization' in the context of photogrammetric mapping?

Accepted Answer

The process of simplifying and selecting map features appropriate for the target map scale

Answer

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.

Question 3

What is 'pansharpening' in multispectral photogrammetric products?

Accepted Answer

Fusing a high-resolution panchromatic image with lower-resolution multispectral bands to produce a high-resolution color image

Answer

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.

Question 4

What accuracy class does ASPRS 2014 assign when RMSEz of a DEM equals 10 cm?

Accepted Answer

The DEM meets accuracy for products with 10 cm Non-Vegetated Vertical Accuracy (NVA)

Answer

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.

Question 5

What is the purpose of 'edge enhancement' in photogrammetric image processing?

Accepted Answer

To sharpen boundaries between land cover classes for improved visual interpretation and feature extraction

Answer

Edge enhancement sharpens boundaries between features in imagery—such as roads, building edges, and field boundaries—improving visual clarity and automated feature extraction.

Certified Photogrammetrist Practice Test

Certified Photogrammetrist Practice Test

Certified Photogrammetrist Photogrammetric Product Generation 3