In: Wagner W., Székely, B. (eds.): ISPRS TC VII Symposium - 100 Years ISPRS, Vienna, Austria, July 5-7, 2010, IAPRS, Vol. XXXVIII, Part 7B 
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Figure 6. Treetop detection 
3.3 Volume calculation and inventory 
With the help of the determined tree heights and crown a 
volume calculation can be made. 
In comparison with manual measurements and estimation, for 
the volume of the tree population a precision of 90% can be 
achieved. 
With classification functions, like maximum - likelyhood - 
classification, the inventory of the tree can be inspecteds. For 
this, some sample areas will be digitized and the sample areas 
will be used to improve the automated classifications. 
These function have their fixed position in the way of analysing 
and in association with true orthophotos these function will 
reflect a high precision in horizontal and vertical position plus 
degree of automation. 
4. CONCLUSION 
For three years, FMM has produced and used true orthophotos. 
7500 km 2 , mostly in Austria, are developed and analyzed. This 
data will be used in forestry reporting and their special 
applications. The images are to provide a basis for the inventory 
and correction of forestry information at stationary or mobile 
devices, on the other hand as illustration in webapplication for 
the forestry. Exactly in this economical sector these kind of 
orthophotos with the help of automatic analysis techniques 
reduces the investment of the data collection and processing at 
70 %. Inventories after damages are made rapidly and 
rationally. Total costs for forest enterprise can be reduced, in 
spite of some minor expenditure in comparison to normal 
orthophotos. 
In webapplication, for planning- , logistics or organisation 
software, unknown observer getting well with true orthophotos 
and can to adapt rapidly the displayed landscape. With that fact 
it is given, that the user, planer or driver can concentrate of the 
essential of his work. 
Other customers, like energy providers uses the true 
orthophotos and digital surface models. An economization and 
cost saving can be localized for example by the analysing of 
cable ducts . Energy providers have a growing interest to work 
with such data, because it is qualified for a calculation of 
solarpotential or noise diffusion. FMM is working continuously 
to develop automatic methods on the base digital surface 
models and true orthophotos. 
Cadastral authorities and municipalities are also customers, 
which need the data of FMM to standardize and upgrade the 
actuality and precision of the cadastre. 
Generally, true orthophotos und digital surface models are 
known everywhere but the utilization is just beginning. The 
potential uses of this data is nearly inexhaustible and will be 
underrated by many people. There may be questions about the 
costs and the high hardware profiles, but with optimized 
operation and automatic techniques this handicap is to 
overcome. Permanent customers are proof of this. 
FMM will continues this way and continues to search for 
automatic methods to accelerate the production and 
examination. 
4. REFERENCE 
Tiede, D., Osberger, A. , Novak, H., 2009. Automatisierte 
Baumextraktion mit höchstaufgelösten Oberflächenmodellen 
abgeleitet aus UltracamX-Daten, Extended Abstract, AGIT 
Band 2009. 
Dorfstetter, L. Novak, H., Ulz, M., 2009. Neue Einblicke von 
oben , Arbeit im Wald 2009, pp 14-15. 
Figure 7. Classification