photogrammetry as a research tool greg burgess derf november 2008
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Photogrammetry as a research toolPhotogrammetry as a research tool
Greg BurgessGreg Burgess
DERF November 2008DERF November 2008
Measurement of direction from an imageMeasurement of direction from an image
Photographic determination of the Photographic determination of the coordinates of a pointcoordinates of a point
Fig
ure
: G
eo
de
tic S
erv
ice
s In
cF
igu
re:
Ge
od
etic
Se
rvic
es
Inc
Photographic determination of the Photographic determination of the coordinates of many pointscoordinates of many points
Fig
ure
: G
eo
de
tic S
erv
ice
s In
cF
igu
re:
Ge
od
etic
Se
rvic
es
Inc
Camera positionsCamera positions
Camera calibrationCamera calibration
Camera parameters to Camera parameters to determine:determine:
Principal distancePrincipal distance Principal point locationPrincipal point location Lens distortionsLens distortions
Archaeological photogrammetryArchaeological photogrammetryIm
ag
e o
f th
e M
ed
ina
of
Fe
s, M
oro
cco
, p
roce
sse
d u
sed
TIP
HO
N s
oft
wa
re,
M K
oe
hl
Ima
ge
of
the
Me
din
a o
f F
es,
Mo
rocc
o,
pro
cess
ed
use
d T
IPH
ON
so
ftw
are
, M
Ko
eh
l
Mirror panel mould photogrammetryMirror panel mould photogrammetry
Mirror panel photogrammetryMirror panel photogrammetry
A very big dish…A very big dish…Im
age c
ourt
esy
of
the N
AIC
- A
reci
bo
Image c
ourt
esy
of
the N
AIC
- A
reci
bo
Obse
rvato
ryO
bse
rvato
ry
SG4 jigSG4 jig
SG4 jigSG4 jig
Photo
: J Pre
ston
Photo
: J Pre
ston
Photo
: J Pre
ston
Photo
: J Pre
ston
Photo
taken b
y s
om
eone w
ho is
less
afr
aid
of
heig
hts
than m
ePhoto
taken b
y s
om
eone w
ho is
less
afr
aid
of
heig
hts
than m
e
Jig with retro-reflective targetsJig with retro-reflective targets
Vision Measurement System (VMS)Vision Measurement System (VMS)
Problems…Problems…
Principal point instabilityPrincipal point instability
Principal point dependence on camera roll angle
-0.28
-0.26
-0.24
-0.22
-0.20
-0.18
0.05 0.10 0.15 0.20 0.25
PPx (mm)
PP
y (m
m)
-90˚ 0
90˚
Problems…Problems…
DewDew
FSJ4 1 Oct 2008 resultsFSJ4 1 Oct 2008 results
Estimated measurement accuracy:Estimated measurement accuracy:
σσx & x & σσy ≈ 0.5 mm, y ≈ 0.5 mm, σσz = 0.35 mmz = 0.35 mm
RMS height deviation of mounting points from the RMS height deviation of mounting points from the ideal paraboloid: ideal paraboloid: σσh = 0.56 mmh = 0.56 mm
Internal measurement precision: 1:230,000Internal measurement precision: 1:230,000
Pho
to:
M S
hort
is