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Materi kuliah GIS untuk Teknik Sumberdaya Air
Citation preview
1
03-1: Fotogrametri : Geometri
dalam Foto Udara
Disampaikan Oleh : Dinar Dwi Anugerah Putranto
Sumber : John Jensen, Remote Sensing of the
Environment
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Aplikasi untuk Foto Udara
Exposure station #1
stereoscopic model
#2 #3
Direction of Flight
terrain recorded on three successive photographs
lens
altitude above ground level, H
60% overlap
Coverage of photograph
Flightline of Aerial Photography
3
Pertampalan Foto Udara
20 30%
sidelap
oblique photography may be
acquired at the end of a
flightline as the aircraft
banks to turn
Flightline #3
Flightline #2
Block of Aerial Photography
Flightline #1
4
Contoh :
Sumber :
Jensen:
photos of
Columbia SC
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Foto 4-5 dari slide sebelumnya
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Geometri pada
citra foto udara di
atas permukaan
yang datar
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Geometri secara detail di atas bidang datar
Scalef
H
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Detail
Geometri di
atas bidang
yang
berbukit
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Tinggi yang diperoleh dari relief
displacement
r
Negative
Exposure station, L
local datum
h
H
d
r
H
=
d
h
h d
r =
H x
r = 2.23 in.
d = 0.129 in.
H = 2978.5 ft above local datum
h = 172 ft
Principal point
Positive
f
A
B
a
b
b
a
o
o
PP
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Contoh : Tinggi dari relief displacement
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Tinggi yang diperoleh dari panjang bayangan
Sun's rays
shadowL
Measurement of the Height of
Objects Based on Shadow Length
h
a
tan a = adjacent
opposite
= shadow, L
height, h
h = L x tan a
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Contoh : Tinggi
yang diperoleh dari
panjang bayangan
0.119 59.1
0.241 119.65
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Prinsip Stereocospis
Sefinisi dari sudut
paralaks
tan2 2
cot2 2
A
A
AA
b
D
bD
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Stereophotogrammetry
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Persamaan Parallax
absolute parallax (air base in previous slide)
differential parallax ( or in previous slide)
flight altitude (where is measured at altitude )
height of object above
a b
o
o
P
dP P P
H h P h
h h
dPh H h
P dP