JAPRS & SIS, Vol.34, Part 7, “Resource and Environmental Monitoring”, Hyderabad, India, 2002
Thus, the set of hardware equipment of monitoring Centre
allows to produce, support and update GIS for specific area or
region practically in real-time. In this case GIS includes 3 main
components:
digital terrain map;
thematic maps updated or newly produced according to
requirements of a specific customer;
3D terrain model.
Figure 3. Operation of the Ground Receiving Station
The basis of any GIS is digital terrain map. Digital terrain maps
should correspond to topological requirements and should be
produces in account of spatial logical relations between
different levels (or layers) of digital data. In general case terrain
maps, including those produced on a basis of space imagery,
contain the following (by layers):
geodetic basi? elements;
ortho-image;
terrain relief represented in a form of contours with
optional regular matrix of heights;
hydrography and hydrographic constructions;
cities with classification of buildings by type and
material;
industrial, agricultural and social objects;
transportation network (roads, railroads) and road
constructions;
vegetation and soil;
borderlines;
text and semantics.
Depending on customer's requirements so called thematic maps
are produced. Thematically processed images serve as the basis
for production of thematic maps and filling of GIS. Familiarly,
experienced and skilled operator is making imagery
classification in interactive mode. One and the same image can
be used for extraction of different information (road networks,
hydrology, forestry classification, etc.) depending on the
specific need of the customer.
Operation of the Ground Receiving Station
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628
