Mauro Caprioli
65 MicroStation Command Window - grid0.dgn [To] x]
File Modifica Elemento Impostazion Strument Ware Area dilavoro Applcazioni Finestra 2
AF =O doo old]
E
99.0 ; Calturalo schemo
: altura rettangolo |
S ii ims 3 Caltura vista-senza bordo |
= 80.9
È
o
g
5
u 760}: (B)
(A)—> P Existing Data
s Laser Data
BO dt MEC E. vol 50.0
90.5 20.0 40.@ 60.0 82.0 100.0 140,0 136,5
Distance [nm] -
Bd4-0auso»cog[€« | { [+] 5
| -^ d Livelo-3 id
Figure 7. Section on a builded area on 1:500 map scale
S. CONCLUSION
The critical examination of the performed comparison consent to point out some basic considerations on the new
laser methodology, thinking of photogrammetry methodology as the truth on the ground, with all the limits of
this hipotheses.
The utilization of the LASER DATA results:
e In the not builded areas a lot of metric information (points) are available so that a very good surface
terrain representation it is possible, with an accuracy certainly higher than the photogrammetric one, even if
some strange value (poles, trees, etc) it is present because of the higher detail level reachable.
* [n the builded areas the LASER data permit to obtain a high detail level of the roof while some problems
appear when the laser move from the road to the roof because of points with intermediate values in
between, related to the front-side of the buildings. These points should be removed to obtain a better
representation of the whole area.
In the future, as software and hardware are going to improve, the use of LASER SCANNING DATA will be
more frequent in order to obtain much accuracy and a possible friendly use of this new methodology.
ACKNOWLEDGMENTS
This paper is part of a national research MURST COFIN-98, on Airborne Laser Scanning for digital models ,
Project Leader: Prof. R. GALETTO.
We are grateful to Mr. Roberto BRATTELLI, Intergraph Registered Consultant for his help.
International Archives of Photogrammetry and Remote Sensing. Vol. XXXIII, Part B3. Amsterdam 2000. 139
