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International 
REGISTRATIO!N 
KEY WORDS: Surface 
ABSTRACT 
Laser altimetry has prov 
for the production of \ 
accurate heights. Altho 
calibration errors that m 
data to achieve the bes 
registered. The researc 
different methods, and i 
The surface registration 
observation equations. 
by the algorithm include 
were carried out using 
aerial imagery covering 
error in the location of 
presentation of the equa 
1 INTRODUCTION 
Airborne laser altimet 
obtaining a digital sur 
using laser altimetry is | 
the data, the efficiency 
processing required. 
provide — measuremer 
photogrammetric techn 
include urban areas, wo 
no texture or contra: 
Following this determi 
complementary to pl 
provide benefits when 
methods. This approa 
researchers (Ackermanr 
Brenner, 1999; Csathó 
Haala and Anders, 1997 
Vosselman 1999). 
Utilizing data from bi 
requires that the two 
system. To ensure this 
the data sets must be ı 
algorithm presented in 
registering surfaces der 
data. 
The transformation par: 
contain irregularly dis 
requiring the surfaces t 
parameters ^ represen