Continuation: TABLE N° 2 
TRIANGULATED STRIPS WITH THE INSTRUMENTAL METHOD 
  
  
No 
28 
Country 
U.S.A. 
Survey 
purpose 
Organization 
map scale 
Photo- 
em Tac nc 1n 
total area | Cameras | graphie 
material 
1870 strips 
137.090 km 
Navy Hydro- 
Im S13 2 
|Fairchild film 
graphic office | 
m. ii 
special large 
scale 
| 
| 
or 
Forest Service |1 : 24.000 
[smaller 
Lockwood Kess- Fairchild film 
ler & Bartlett, "Tq. 12 
Inc. R.C. 8 
| Fairchild film 
K. 3 B. 
International |5 strips 
Aerial Mapping |116,5 km 
Company 
Highway 
planning 
  
Flight 
| "light Overlap | s: E | 
| Camera Fligh I | Auxiliary| (round | 
| : altitude | Photo and ? | | 
calibra- a | S equip- |character- 
tion | . anc SCALE Strip | ments istics 
| direction length | | 
= oes . — —— nn —|- 
| pe | 
| By Bureau 20.000 ft. | 
lof Stan-|30.000 ft. | 
| dards. | | 
(Cameras! | 
lare opera-| | 
tionally|3.000 ft. | 
[service te-|6.000 ft. | 
| | 
sted over| | 
|a camera! | | 
test range | | | 
|prior to| | 
leach sur-| | | 
vey | | 
| | 
| | | [^ | 
N-S or |1:35.000 |50 km Rugged 
|E-W | \terrain 
| 
11.200 ft. |1:2.400 [60 
6.000 ft. |1 : 40.000 [10-12 mo- 
mainly dels | 
| : 12.000 | 
| | 
| | 
| 
| | 
. ws a | | 
19.000 ft. 55-60 | Very steep 
19-10 mo- (terrain 
dels 
Bridging 
  
Ground control points —— 
| Plotting instruments 
| | 
| Thermical | Operators| 
> S| 
Tol Position of Plotting Preli- | character | | 
ber : enaractor and | Bridging 
num control points Type instru- minary | istics | * y | : je 
r ; i | | working metho 
fo in the strip ments tests | of kins 
strips | shifts 
rooms | 
| s | | d 
| | | | | | 
{An average strip/lst, 2nd,|C. 5 Grid test.|Partly con-|1 operat. 
lof 15 models has 3rd and C.8 ERDL me- [trolled 
|8 points-strip. The|4th order| Multiplex |thod is used | 
minimum number|geodetic| 
lof points being|stations | 
three | 
| 
| 
Each strip cover 0. 8 Grid test. |Aircondi- 
not less than 6 tioned 
horizontal control 
points. 
Vertical points are 
in pairs, one on ei- 
ther side of the cen- | 
Iter line of the flight 
land spaced equally 
in the direction of 
flight. 
First model: 
vertical points. 
Each strip has not 
less than four bands| 
four 
Where feasible, con-|2nd or 3rd A. 5 Normal pe-|Air con -|3 shifts 
trol is established |orderpoints riodic check | trolled 
in every model. 
First and last mo- 
dels have 3 or more| 
horizontal points. 
Where impossible, 
2-4 horizontal po- 
ints are selected 
every four models. 
Large scale map: 
16 vertical points 
each model. 
|Middle scale map: 
vertical control is 
lestablished every 4 
-5 models 
A minimum of 5|Photogra-|S. IV Normal pe-| Aircondi-|2 operat.| 
horizontal ^ points|phic points riodic check |tioned 1 shift 
and a minimum of 9 
[vertical points. 
| | 
Bridging characteristics 
j : e rip : [ 
| | 
Relative Use k ; | 
and | of data Time N° of | 
absolute from | required | repe- | 
| Orientation | auxiliary | for model | titions | 
| 
| 
of models |equipments| | | 
| | 
I 
| | | 
fre d 
  
| ^ 
6 points empirical |2 hours 
{method 
| 
| | | 
|The initial model 8 models 
lis brought into [a day | | 
[absolute orienta- | 
tion | | | 
The initial model 
brought into 
labsolute orienta- | 
tion | 
[18 
| Visual method 1 hour 
| 
Adjustment of 
A. distortion 
D. 
C. film 
shrinkage 
C. By f varia- 
tion 
C. By f varia- 
tion 
A. By cams 
refraction | 
  
| 
| 
| 
| 
  
| 
| 
| 
| 
— — ——| — 
Horizontal po-| Vertical ad-| 
Planimetry 
Adjustment of strips 
| Use of data Use 
| Altimetry from of ; 
| auxiliary | electronic 
| 
| 
| | 
| 
| 
| Datatron 
sitions are ad-|justment is| 
ve 
|justed by ma- | 
|thematical cur-|phically by 
fitting 
graphical 
thods. 
Mathe-| 
performed gra-| 
or|« spline-curve| 
me- |method ». | 
matical me-| | 
thod consists | 
of fitting error| 
cond order cur- | 
ve by 
square 
| 
| 
curve to a se-| | 
| 
method. 
\thod 
| 
| 
| 
| 
| 
| 
Graphical solu- | 
tion developp-| 
| Analytical me- 
least| 
| 
| 
IIBM 650 
|ed by U.S. Ar-| 
|my Map Servi- 
ice. Total cor- 
| . 
[rections 
curves 
| . oi} 
(their two deri- 
|vatives. 
| 
| Analytical me-|Vertical curve 
\thod 
[the two basic 
| Bendix 
G. 15 
from 
and] 
| | 
| | 
| 
| | 
| 
| 
IBM 
| method by gra- | 
|phical means. 
leached 
Use of 
other Sa 
| equip- Tests 
| ment 
jequipments| computers | 
| 
—;— 
| 
| 
| 
| 
| Maximum residual 
precision 
Mean errors 
error 0.01 inch. 
| at publication scale 
— FM ee renes 
| Precision reached is well within na- 
| tional map 
accura 
icy requirements 
| One fortieth of an inch at the scale 
| of the work