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International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol XXXV, Part B4. Istanbul 2004
Figure 3. A part of LANDSAT block
After the adjustment, the orthophotos were produced. In the
production of the orthophotos, 100 meters interval Digital
Elevation Model (DEM) was used. Then, the orthophotos were
mosaicked. The resulting product was Turkey's mosaic.
3D visualization was produced in Erdas Virtual GIS module.
Road and railway network, city boundaries, names of the cities,
towns, rivers, lakes and dams (Figure 4).
Figure 4. Perspective view with the settlement names.
Also with a program produced in Photogrammetry Department
of GCM, it is possible to superimpose location names and
some other vector data on to the orthophotos (Figure 5).
Figure 5. Vectors over Landsat orthoimagery
45]
The panoramic view of the same area is shown in the Figure 6.
Figure 6. Panoramic view of Istanbul
3. CONCLUSION AND PROPOSALS
The need for a base in small scales comes out in every
technologic field. The accuracy, completeness, exquisiteness
and visuality are the important prerequisites for a base. By the
classical maps, one might not understand the topographic
structure of interested area. Also, it is expensive and time
consuming to produce classical or vector maps. If the high
resolution imagery and aerial photos are used for a base, the
costs and storage need will be very high. So the optimum
solution should be cheaper, less time consuming and should
need less storage capacity. Landsat imagery best fit the above
mentioned conditions. As a result, Turkey's mosaic was
produced from Landsat imagery with an accuracy of 1:100.000
scale maps.
With the help of the computer technology, seamless images can
be created and used quickly. The computer technology enables
everybody to use such geographic materials easily.
The resulting product (Turkey's mosaic) is open to every
possible application field. Especially, it is useful in areas
where overall view of Turkey is necessary. It has many
application areas: By enhancing the mosaic with some vector
data, names of historical places, settlements, accommodation it
serves as a valuable tourist map. It can also be used as a base
in vehicles” trip computer system or in vehicle tracking system
of a transportation company. The mosaic will help the pilots fly
over Turkey, instead of using 1:250.000 scale hardcopy maps
in airplanes or helicopters. They can also use it prior to the
flight in flight planning process by 3D visualization. It is
possible to construct Turkey's Geographic Information System
(GIS) based on this mosaic. Such a GIS will help everybody
who needs planning over whole Turkey.
References from websites:
LANDSAT Project,
http://www.landsat.gsfc.nasa.gov/projectsatellite.html
(accessed 05 May 2004)