Vr Mapping
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REFERENCE
Some useful information
NMAS – National Map Accuracy Standards
ASPRS – American Society for Photogrammetry and Remote Sensing
C-Factor
Cf = H/Ci
Where:
Cf = C-Factor
Ci = Contour interval (feet)
H = Flying height (feet) above mean ground level
Maximum ASPRS and Interpolated NMAS-C Factors
|
Map Accuracy Standard |
Softcopy Workstation |
Analytical Stereoplotter |
|
ASPRS Class 1 |
1600 |
2000 |
|
NMAS |
1700 |
2100 |
|
ASPRS Class 2 |
1800 |
2200 |
|
ASPRS Class 3 |
2000 |
2500 |
Source: Aerial Mapping methods
and applications / Edgar Falkner and Dennis Morgan – 2nd edition –
Lewis Publishers
Maximum Recommended Enlargement Factors from Photo Scale to Map Scale
|
Map Accuracy Standard |
Softcopy Workstation |
Analytical Stereoplotter |
|
ASPRS Class 1 |
6.0 |
7.0 |
|
NMAS |
6.5 |
7.5 |
|
ASPRS Class 2 |
7.0 |
8.0 |
|
ASPRS Class 3 |
8.0 |
9.0 |
Source: Aerial Mapping methods
and applications / Edgar Falkner and Dennis Morgan – 2nd edition –
Lewis Publishers
Film Strip Location – Zeiss RMK TOP
Source: Z/I Imaging – Denver Co.
Film Strip Location – Wild RC10/20/30
Source: USGS Optical Science Laboratory