Sympo. 
The a 
L.M.Baii 
Remote Se 
P. Robins 
Operatione 
1 INTR0D1 
The vai 
environir 
officai 
contact 
to a hea 
existenc 
1984) . 
local au 
play to 
in planr 
Recently 
Council 
Nature C 
of West 1 
the enha 
open spa< 
resident 
only evi 
' develop« 
space is 
in the 
compromi 
between 
demand : 
there is 
which ai 
thus try 
away fre 
One meth 
open spac 
capacity 
The a 
feasibi] 
determini 
urban woe 
bird popi 
the pop 1 
developm 
photograj 
studies 
predictic 
1979), he 
too comp] 
merely a 
than as a