Photogrammetry

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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

8

Detail

Geometri di

atas bidang

yang

berbukit

9

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

12

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