Term
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Definition
| Conjegate Principal Point |
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Term
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Definition
| National Topographic Series |
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Term
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Definition
| Forward Motion Compensation |
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Term
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Definition
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Term
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Definition
| Center of the camera lens |
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Term
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Definition
| The art and science of measuring on photographs |
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Term
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Definition
| Metal Rod representing virtual lighting in analog |
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Term
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Definition
| Laser Range Finder used to create a DEM |
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Term
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Definition
| A type of ortho issue caused by scanning. Looks like a rainbow |
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Term
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Definition
| Aerial Triangulation. Calculates position and rotation of all photos |
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Term
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Definition
| condition where 2 image points and 2 perspective centers and ground point creates a plane |
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Term
A client requires 1:10000 photography to cover a rectangular area 15.96km (E-W) by 9.12 (N-S) The aerial photo is 228 mm x 228 mm.
Which would be the optimum flight direction |
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Definition
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Term
A client requires 1:10000 photography to cover a rectangular area 15.96km (E-W) by 9.12 (N-S) The aerial photo is 228 mm x 228 mm.
How many neat models are needed to cover the area |
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Definition
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Term
A client requires 1:10000 photography to cover a rectangular area 15.96km (E-W) by 9.12 (N-S) The aerial photo is 228 mm x 228 mm.
How many photographs are needed to cover the area? |
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Definition
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Term
A client requires 1:10000 photography to cover a rectangular area 15.96km (E-W) by 9.12 (N-S) The aerial photo is 228 mm x 228 mm.
Compute the stereomodel size |
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Definition
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Term
A client requires 1:10000 photography to cover a rectangular area 15.96km (E-W) by 9.12 (N-S) The aerial photo is 228 mm x 228 mm.
Calculate the number of frames |
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Definition
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Term
| What are 3 terrain and seasonal considerations that must be considered when planning an aerial photograph |
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Definition
Terrain may cause stereo dead
Spring Leaf free photography
Sun Angle |
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Term
| Why is the sun angle an important consideration when taking air photos |
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Definition
Shadows too long poor exposure and difficult to see.
Sun too high --> Specular reflection |
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Term
| List different uses for a DEM |
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Definition
| contours, orthophotos, volumes, viewsheds, cross-sections, 3d modeling |
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Term
| Why do we need to colour balance aerial photography when creating orthophotos |
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Definition
| Sun always exposes one side of model more than the other so when mosaiced the images look patchy. |
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Term
| Why do bridges sometimes look distorted in orthophotos |
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Definition
| They are elevated and get projected onto the DEM |
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Term
Calculate the following photoscales.
Photo Distance Ground Distance
2.25" 1112' |
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Definition
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Term
Calculate the following photoscales.
Photo Distance Ground Distance
12cm 1320m |
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Definition
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Term
Calculate the following photoscales.
Photo Distance Ground Distance
152mm 1205m |
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Definition
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Term
Calculate the following photoscales.
Photo Distance Ground Distance
305mm 4231m |
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Definition
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Term
Problems that may arise during the production of orthophotos:
Geometric |
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Definition
| slight shifts from one ortho to the next |
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Term
Problems that may arise during the production of orthophotos:
Colour Balance |
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Definition
| changes in exposure from one side to another |
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Term
Problems that may arise during the production of orthophotos:
hair, scratches |
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Definition
| problems caused by developing and scanning film |
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Term
Problems that may arise during the production of orthophotos:
Elevated features |
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Definition
| Trees and buildings and bridges leaning |
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