ALOS PRISM triplet and stereopairs to build Digital Surface Model

ALOS PRISM triplet and stereopairs to build Digital Surface Model
Valerio Baiocchi,
Baiocchi Maria Vittoria Milone,
Milone Martina Mormile
Area Geodesia e Geomatica,
Geomatica DICEA,
DICEA Sapienza Università di Roma,
Roma Via Eudossiana 18,
18 00184 Roma,
Roma Tel.
Tel 0644585068,
0644585068 fax 0664585515,
0664585515 e-mail,
e mail
valerio baiocchi@uniroma1 it
[email protected]
Introduction
I the
In
th p
present
s tp
paper
p the
th p
phases
h s s of
f extraction
t
ti of
f a DSM from
f
ALOS Prism
P is stereopairs
st
p i s and
d triplets
t ipl ts are illustrated.
ill st t d
Images represents a coastal area that spans from the city
of
f Pescara
P sc
t the
to
th city
cit of
f Ortona
O t n (Abruzzo
(Ab uzz region,
i n Italy).
It l )
The availability of PRISM stereopairs and triplets is recent but no longer possible cause platform ended its activities
last year.
year In this paper accuracy of produced DEMs is compared with heights from terrestrial LIDAR survey.
survey
Specific characteristic of the images acquired for this study is the possibility to compare two stereopairs between
them and the stereopairs with the triplet.
triplet
Stereopair and triplet data
Table 1 - Images characteristics
Fig. 1 – Stereopair and triplet coverage
Table 2
2- Accuracy and precison of image orientation
Fig. 2 –DSM obtained from the stereopair width approximately
45 KM
Results of differentiation between DSM Stereopair height and LIDAR height on more than 86000 points using bilinear interpolation
Fig.3
g – LIDAR points,
p
image
g width approximately
pp
y 2.5 km
M
Mean
0 000
0.000
Standard deviation
0.938
Maximum difference
5.825
Minimum
M
n mum difference
ff r n
-3.949
.9 9