Boccardo, Piero
4. RESL
The 3D :
good po
processit
and refr:
the featu
In order
phase a
orthopro
discrepeti
Figure 12 — First taking position Figure 13 — Second taking position "eroding
DEED
funcion: | (Cancel
Figure 14 — Third taking position Figure 15 — Fourth taking position
Acquisition time has been varied from few seconds to couple of minutes; for all the acquisitions, taking also into
account the instrument moving, less than one hour was necessary.
3 POST PROCESSING
Figure
white)
The post-processing phase include the 3D reconstruction by
station using reflective stickers (fig. 16).
means of tie points, materialized onto the underground
4 CON
Accordir
friendlin
photogra
infrastru
In additi
surveyin
few year:
Future st
future su
scan wit]
ACKNC
Figure 16 — Reflective sticker Figure 17 — 3D reconstruction in Cosmos 3D viewer We like
not be pe
The software, by means of an autocorrelation procedure is capable to locate the 3D position of the reflective stickers E
(characterized by a high reflectivity in the near-infrared wavelength), imposing the correspondence of the coordinates REFER
(in a given reference system) of them in the different images (tie points).
The 3D reconstruction generates 3D files (in a 3DD fi
le format) that can be easily viewed using free-of-charge internet
downloadable software such as COSMOS (fig. 17).
P. Wald
Vienna,
Internet
74 International Archives of Photogrammetry and Remote Sensing
. Vol. XXXIII, Part B5. Amsterdam 2000.