75 
ts, for the 
cents per 
OBJECTIFIED DATA FOR URBAN GREEN-PLANNING FROM CIR-AERIAL PHOTOGRAPHY 
ves most 
resources 
r that important 
tool whereby 
water availability, 
s which govern 
valuation of 
n of high 
ves to be an 
ation, sensi- 
iple use 
the soil 
imagery, aerial 
to be an 
nagement 
s should the 
Hartmut Kenneweg 
Institut für Forsteinrichtung 
und Ertragskunde der Universität 
Göttingen 
The high contrast between any form of green vegetation and other 
features of an urban environment as seen on CIR-aerial photos, raises the 
question of whether there is any possibility of making use of CIR aerial 
photography for inventory purposes of urban green. As urban areas are the 
most intensively managed type of land use, there is a need for detailed infor 
mation mainly. Because of good access to almost all parts of cities many of 
the usual advantages of aerial photography do not exist here: much of the 
information which might be obtained from photo interpretation is known before 
or can be collected cheaper and easier without aerial photography. That is 
why any small-scale photos and especially satellite imagery can be excluded 
a priori from further considerations — as far as operational use is concerned. 
But there are some inventory problems which might well be solved using CIR- 
aerial photography — in spite of the mentioned restrictions. This was shown 
by the great demand and interest of West German city-authorities to make use 
of CIR aerial photography for collecting information and as a document of the 
present vitality, or, more exactly, the present degree of damage of their road 
side trees (MONARD 1972; THIADENS 1972; KADRO and KENNEWEG 1973; KENNEWEG 
1974). In some cases mainly economic cost-benefit-reasons prevented inventory 
and documentation of roadside trees to be carried out: costs for aerial photo 
Sensor 
graphy of smaller cities are as high or even higher than costs of an inventory 
on the ground; the additional value of aerial photography as a document for 
observations of further development is difficult to convert into terms of 
money. More possibilities to make use of CIR-aerial photography were not 
recognized by the municipal authorities or, at least, were not estimated par 
ticularly high. 
:>ne. 
This paper will present a suggested method to derive both easily and 
cheaply code-indices to characterize the supply of urban people with parks and 
with vegetation in general using photo interpretation in connection with known 
statistical data. The suggested indices may be worked out for small portions 
of a city as well as for larger city districts or even for whole cities. The 
leology of 
3 and Geology, 
bird’s eye view allows all green vegetation to be included into the calcula 
tion of the indices, not only in public parks, but also on private property. 
During the last years’ boom of building and road construction in 
urban areas, a certain problem was very often discussed by members of city- 
administrations, planning-managers, experts for protection of environment and 
by interested groups of local citizens: which argument can be used to work 
out objectified criteria for local statutes on construction-planning and con 
struction-permission, in order to cause private land owners and land-developing 
companies to protect and preserve trees, green areas and gardens on their 
property, at least to a certain part, in order to stop the permanent conversion 
of private urban green areas to parking lots and buildings at a certain minimum