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International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol XXXV, Part B4. Istanbul 2004
normal lens cameras are preferred for the area that is hilly or
urban area.
In photogrammetric applications, in order to obtain stereo
model, end lap is assumed to be 60%. To cover the project area
completely with sterco models along strips, side lap is assumed
to be 30%.
The flight line directions are generally planed in East-West or
North-South direction. The flight line direction might be in
different direction in some cases. The land limitations such as
mountain range, lake, and scaside affect planning of the flight
line directions. In these situations, flight lines are planed
parallel to these details. And also needs of cross strip affect
planning of the flight line directions.
Calculating the flight height is also taken an important place in
planning. Selecting a lower altitude for flight causes photo
scale to be grater than desired scale and causes the laps to be
smaller than desired ratio. This situation might causes gaps
between models and strips, and causes need of additional
flights.
All these processes are time consuming processes and must be
performed carefully. Any carelessness or mistakes might cause
many errors in the future. To eliminate most of these errors that
might be occurred in the future, using software for calculations
and preparing all plans in digitally are considered as the best
method.
1.3 Flight Planning Software
This software is developed according to request of our users.
The software is intended to prepare flight plans in digital
format. The software is formed with many useful tools for
planning. These tools cover all the aspects of modern aerial
survey photography: Digitizing, planning, taking photograph,
reporting, archiving, besides the basic tools: zoom, print etc.
In order to start a project, the project requirements must be
entered to the system in the project definition step by using
project definition window shown in the figure 1. These are;
Project name
Project manager
Brief definition of project
Project area
Project owner
Focal length of camera
Film type
End and side lap ratio
Average terrain height
0. Min. and Max. change ratio in scale or laps
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According to this information, the software automatically
calculates other necessary information for plan. Base length,
distance between strips and flight height according to average
terrain height are calculated in this step.
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Figure 1. Project definition window
Next step is planning the strips, single photos and control
points. In main window shown in the figure 2, all planning
process can be applied. Raster or vector data can be used as
base map for planning. Coordinates can be entered by using
base map directly or entered manually. Tools in the main
window for planning strips are;
sin Create
2. Copy to next
3. "Delete
4. Rotate
5. Move
6. Divide
7. Make extend
8. Make shorten
9. Enter terrain height manually
Tools for planning single photos are;
Create
Move
Delete
Rotate
Enter terrain height manually
Enter coordinates of exp. Station manually
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QN Cn
Tools for planning control points are;
] Create
2. Move
3,1 Delete
4. Enter coordinates manually
5. Read coordinates from file
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Figure 2. Main window
