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International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol XXXV, Part B2. Istanbul 2004
analyses over the correct overlap can be done
immediately to see, if additional photos are
needed. The data can be uses as initialization-
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triangulation software.
Figure 3: Screenshot of the planning tool for
scanning campaigns
APPLICATION FOR SCANNING
The application for scanning, f.e. with aerial
lidar or optical MS-sensors, is similar like for
aerial imaging. Usually already a GPS-INS is
installed, to far a interface to such a sensor can
be defined.
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In the planning part, the scan angle and the 4 ——
à Start/Stop scenning coordinates
Check and confirm coordinates of start/stop scanning +
coordinates og For
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23 snatorfugiscan-t oni
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overlap of the strip. The other things are
moreless the same as for aerial photographs.
The scan width is directly connected to the roll parameter and
the terrain. In some sensors, the distance of the outer points
are computed online, so far the width can be computed
directly. As an online-monitor, the implemented displays
show the roll values and its limits. The already scanned area
will be displayed as a more less straight strip. Up to now the
scanner is controlled separately and this application is used
for navigation only. In a further step also the sensor can be
controlled by this software. Important is here the use of a
digital terrain model, especially if the scan angle is wide.
With this dada, a real-time control if the done work is
possible and missing parts can be captured still in the air.
SYSTEM FOR EMITTING OF MATERIALS- FORESTRY
APPLICATION
Figure 4: Helicopter for chalking forestry areas with the
emitter under it
In Europe and also world wide, the forest has sickness
because of air pollution and in the case of S0; pollution,
problems with acid rain and acidification of forest soils.
Since several years, the forest-institutions under-take
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chalking campaigns against the soil acidification. In the
meantime, the emitting via helicopters is the most used
variant of this application. Usually it will be done by private
companies, which get the job after tenders from the countries
forest administrations. In Germany, every year several
thousands of hectares are chalked by helicopters, done by
external companies and managed by the countries forest
administrations. There exists a big need to document the
emission of chalk by helicopters and planes. Not only for
planning and navigation, also for documentation of the done
work and also to control the firms doing this job. In the frame
of ISO 9001 and upcoming European rules, a documentation
of such applications has to be done as well. So far a system,
based on GIS, GPS, Sensors and avionics, has been
developed.
Heart of the system is the Trimus AeroLogger which was
developed on base of the Trimus K++ technology. In the case
of fast movements, a rapid updating of the position is needed.
We built in a fast GPS-board, which gives an accuracy of 1 m
with a refresh rate of >=5 Hz. The accuracy is guaranteed by
a C/A and L1 code smoothed measurement in combination
with EGNOS-correction.
The GPS is combined with a processor-unit, which connects
| other serial port, 8 analogue ports with 12 bit and an event-
in switch. All data, from the GPS, the serial and analogue
ports, and the event-in switch are synchronised to the
frequency and the watch of the GPS. As a redundant, difficult
to manipulate, data-logging system, the Trimus Aerologger
has a SM Drive to store either the entire track or controlled
by the event-in switch (£e. during the application event). This
data are stored in 1 Hz on the SM-Card and are processed
separately. The Aerologger sends continuously besides the
logging a modified MNEA-string to a Cockpit-Computer
with >=5 Hz, to navigate the pilot to the application places.
The Computer is able to start, stop or interrupt the emitter,
map its work and display the result directly on the monitor.
The signal for emitting will be given by the software, but also
a manual control is possible. A related signal will be given
from the emitter to the Aerologger and again back to the
computer. This event will be monitored.
The software is based on 2 parts. One tool supports the
preplanning of the campaign, the other: manages the
application during the flight. For the planning most important
