International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol XXXV, Part B2. Istanbul 2004
Ansicht Bearbeiten Raster Analyse. Externes Gerät Aero
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Check cea and protectéd zones
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Kalkungsversuch FA Kempfeld
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0 500 1000 1500 2000 3000 Meter
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Fiatz (Rastplatz Parkplatz)
Figure 5-7: Up the preplanning tool of the work with zones of
different protection status, in the middle the track of the
helicopter and down a application map of the forestry work
are the areas to be worked on. They are either already given
by the forest-organisation or they have to be digitised
onscreen in the software. The areas have to be defined and
might be also the intensity-level. Very important is the
definition of protected areas, where not any chalk should go
60
in. To support both, sure chalking and sure not any chalk,
buffers can be defined around this types of areas. That's
the main feature in this tool.
More complex is the software for the flight itself. The
system needs for the computation of the drift, information
about the wind-speed, the wind-heading, the average drop
speed of the chalk-corn and either a value of the flight
altitude over ground or information of a digital terrain-
model, which also can be used in the software.
Further on we need an information about the spray-width
of the emitter. With this information we can start the
flight and the GPS continuously show the position of the
helicopter on the moving map and a bar where the chalk
would fall down. If we reach the area, a signal (optically
and acoustically) will be given. If we have set the
automatic mode, the computer gives a signal to the
parallel port of the computer and a switch there opens the
emitter. The signal, that the emitter is opened to spray the
chalk, will be given to the Aerologger as well and the
information will come back to the software. The software
computes either by the predefined altitude over ground, or
by the combination of the GPS-height and the terrain
model the drop-height of the chalk-corns. The influence
of the wind and its direction take place and the final place
where the chalk meets the ground will be mapped.
Finally, a strip will be mapped on the screen to show,
what is done. If we reach the buffer of a protected area,
the emitter suddenly will be switched of and a warning
appears. The overlap between the flown strips have to be
controlled manually.
One result will be the mapped tracks of the Aerologger
and the software itself. Visible on the sceenshot on the
left are the tracks, which guide always back to a central
place, where the chalk is loaded. The emission of 1000 kg
of chalk needs 20-40 seconds. That's the reason, why the
track is relatively big and a lot of turns lead back to a
central place.
À second result is an application map to see, what has
been done. This helps for further planning and the control
of the effect of the work. Such an application map can be
seen down.
In a next development will be integrated a digital camera,
which takes frequently images during the application. The
camera has to be controlled completely by the software.
The name of the image in the camera has to be linked to a
point with coordinates in the database. Only a view digital
cameras allow access from an outside software. This tool
is under development.
This application can be easily adapted to any other field.
It does not have to be airborne as well, it is an interesting
technology for agricultural as well. To manage
fertilisation by machines, pesticide-spays with planes and
many others could use this technology. The system can be
enlarged by several sensors for any monitoring and
implicational job.
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