l. information source and basic maps 
The first step of establishing the 1lib- 
rary is to select the appropriate informa- 
mation source. The colour infrared aerial 
photoes can accurately reflect not only 
the profile of the tree crown and the 
scope of the spacious green land but also 
the different types of plants, growing 
conditions, mature extent , chlorophyll 
content and the relative relations with 
environmental factors, through the diffe- 
rence of colour, vein and shape of photo 
image. Before establishing the library, we 
accomplished the following basic works 
according to the colour infrared photoes 
and other remote sensing materials. 
1) Greening present situation maps of 
1:5000 and 1:20000 were translated , with 
the topographic maps of the same scale as 
control base and by single-projector tran- 
sfer as a tool of uniformizing the scale 
and eleminating photo errors. The former 
is used as the basic map to accurately 
carry out the statistics of all kinds of 
greening area and overlay rate, and the 
latter is used as the basic map for the 
research of greening changes and for 
the comprehensive analysis of environment 
factors such as construction density, popu- 
lation density, heat field, dust, noise, 
toxic gases, etc.. 
2)On the basis of 1:5000 greening present 
situation map, distribution chart of side- 
walk tree varieties were charted. After 
differentiating major tree varieties acco- 
rding to the colour and shape of different 
tree varieties reflected on the aerial 
photoes and checking through on-the-spot 
investigation. 
3) On the basis of 1:20000 greening pre- 
sent situation map, and with reference to 
the aerial photoes in 1964 and 1981, gree- 
nig change charts were interpreted and 
charted. These charts not only can reflect 
the regional feature of greening change 
and the increased or reduced area of 
various kinds of green land, but also can 
be used to analyse the change process 
and cause in comparison with the aerial 
photoes. 
4) The regional population was investiga- 
ted and intputted to carry out the statis- 
tics and analysis of the per person green 
land conditions. 
2. Formation of greening data file 
The image-spot showing the present situa- 
tion of urban greening distribution are 
selecting control points 
translation 
small and dispersive so the relatively 
economic and applicable method now availa- 
ble for the statistical quantization is 
the method of dot grid. We directly formed 
£rid data of greening overlay rate  (GOR) 
with the dot grid. In order to raise the 
the efficiency of the work, we also tried 
directly input the greening information on 
the photoes into the computer by using the 
colour scanning system to form the polygon 
data file. 
As to the grid structure, a single grid 
is used as analysing and processing unit. 
Many codes of greening and environment 
information may be stored in one grid . As 
classification border line is automatical- 
ly formed by code gathering,it is not only 
possible to save storage space, but also 
to carry out code overlapping analysis and 
statistics in the same unit. However the 
polygon structure has such advantages as 
high speed, correct border line, high pre- 
cision of area quantization etc. in input- 
ting and exportting complicated images and 
it is only such structure that can realize 
the input of greening pattern, so we use 
both the two structures in the library. 
Fig. 1 shows the working procedure of the 
establishment of the 2-D greening data 
library. 
3. Monitoring of greening dynamic 
We use the Shanghai present situation 
information library as a basic library, 
which may further form a greening 
dynamic data library in both positive 
and negative directions . The newest 
library may be formed through amendment 
and renewal of the duplicated basic 
diskettes by the aerial photo to be taken 
during recent months.The greening dynamic 
data library of negative direction is 
formed according to the past aerial 
photoes. An greening dynamic model may be 
made by using the dynamic data library. 
According to the information fed back by 
model, we may see the development of 
£reening and even predict future. Fig. 2 
is the negative change model exported 
from the library. This model reflects the 
dynamic change of greening in the area. 
We found out this linear area where the 
negative change of greening were most 
serious and analysed the reasons of 
change as well as provided technical 
basis of polity dicision for controlling 
continue lose of the kind of green land. 
count taken by hand 
with dot grid 
  
projection grid 
compile map of gree- data 
ning information file 
  
  
  
large scale aerial 
photo and map 
pement 
  
  
  
map with control grid 
the aerial photo and basic 
  
  
  
  
  
photographic plane poligon 
control mosaicking data 
automatic scanning file 
  
statistics 
charting 
2-D greening 
model data library 
  
  
  
by the computer 
  
  
exchange software, 
  
editing processing 
  
  
Fig. 1 Frame-diagram of the working procedure of 
establishing the 2-D greening data library 
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