International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol XXXV, Part B2. Istanbul 2004
maps, which cover all Turkey, keep approximately
2 GB.)
e 17 aerlal photographs were put in system, which have
been scanned in 300 dpi for different purposes before.
These photographs were compressed by using MrSid
format at 1:30 ratio. A compressed aerial photograph
keeps approximately 3.5 MB.
e 295 flight strips in composing maps were digitized
and they were put in flight strips layer with their
attributes.
e Center points of 4234 photographs in flight strips
were computed, drawn and kept as another layer.
e Photograph frames were drawn by using center point
coordinates and photograph dimensions thus the
areas, that the aerial photographs cover, were
obtained visually. Then these drawn photographs
were kept as a polygon layer.
e Attributes of center points layer, which includes the
results of probable queries, were reevaluated and the -
attributes that would be presented to users were
determined.
e The settlement information; 162 villages, and 7
bigger settlement area, that the pilot project area
includes, were digitized and kept as different layers.
The result information that the users would get after queries can
be listed as:
e Time of Flight
e Job Type
* Photograph Scale
e. Film Number
e Photograph Number
e Focal Length
e Overlapping Ratio
* Direction of Flight
e Film Type
e Diapositive Information (Exist/Absent)
e Photograph Dimension
e Latitude of Photograph Center Point
* Longitude of Photograph Center Point
e The Path of Photograph in Computer
Query types were prepared as follows:
- Query by the settlement areas: This query was
prepared to answer the aerial photograph requests by using
settlement names like village, city, county etc. The query is
applied by comparing the settlement in its layer, selected from
related menu according to the user's selection, with the aerial
photographs layer.
— Query by coordinate: This is a query type which is
applied by the user’s point coordinates input. The required
background was prepared for accepting the inputs, UTM or
geographic coordinates. Then the script, that calls coordinate
transformation macro and applies the query, was written.
— Query by map name: In this query type, which was
prepared to answer the aerial photograph requests by giving
map names in different scales, the maps from 1 / 100 000 scaled
to 1 / 1 000 scaled were included. To form map index of study
area, only names of totally 8521 maps, prepared in determined
scales above, were entered as attribute data and the maps in
every scales were kept as polygon features in separate layers.
- Query by giving point data on the screen: The
raster map, which belongs to study area and has no layer on it,
comes on the screen and the user draws the feature, on which
654
the query will be done, with the mouse. The query is applied by
comparing the selected area with the aerial photographs layer
by the help of a prepared script.
- Preparing of result table and presenting of
requested aerial photograph: The determined attributes above
that is belonging to aerial photographs are shown in a result
table obtained from an applied query. It is essential to click the
'Photograph' button, underside the screen, for showing the
aerial photographs existing in the result table. When this button
is clicked, a new viewer is opened on the screen and the
selected aerial photograph is seen. The required buttons for
applying different processes with these photographs and taking
outputs of them are present on the upper side of the screen.
In the design of Photo Laboratory Archives Information
System, ‘Drawing of Perspective Centers of Photographs' and
‘Entering of Photograph Attributes’ were the most time
consuming phases. These phases have taken 7 workdays for the
selected pilot project.
Because the query options have been prepared in the design
phase, they are suitable for every map. Because the scanning
process of the maps and photographs is continuing in General
Command of Mapping, it will accelerate the workflow to start
this process with the already scanned maps, when the system is
put into practice
Because the settlement places layer will be taken from
Cartography Department, it is supposed that one map will be
finished approximately in a week with two personnel and one
computer.
S. CONCLUSIONS
The developments in informatics technologies not only force
the public structures and managements to change but also
reshape the international relations by increasing the
globalisation. In this respect; managements are trying to largely
use new technologies to increase the speed, production and
activity in publie services. In this age with increasing
information traffic, it is very difficult to store and present the
data with traditional methods. As a result of this, dense studies
are being carried to prepare information systems and databases
in governmental and institutional scales.
In General Command of Mapping, in this scope of transferring
archives to digital forms, studies for preparing Photo
Laboratory Archives Information System has come to an end.
When the system is put in practice, it will be able to query by
using settlement names, coordinates, map name and by entering
the points forming a query feature on the screen and also it will
be able to prepare result table and present the aerial
photography.
With the application of Photo Laboratory Archives Information
System it will be able to protect and control the sole and
historically valuable aerial photograph archives, accumulated in
years. in Turkey. Also with replying to photograph requests
fastly, the archives will be used productively. Because the
hardware, software and person in charge exist in General
Command of Mapping, there will bc no additional cost in
application of the system. With the coordinated work of
existing components; a contemporary archives which is suited
to e-government philosophy and open to the world by
means of internet, will be able to be acquired.
Interna
tein
Turkish
turkive.
Uyan, |
Turkey
Yomra
Kavran
Special
Comm:
contrib
