Difference between revisions of "Topography - Terrestrial Laser Scanner Trimble GX"
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==Links== | ==Links== | ||
Projects that used the above equipment: | Projects that used the above equipment: | ||
+ | * [http://brandenburg.geoecology.uni-potsdam.de/projekte/sesam/index.php SESAM II] | ||
Other related web sites: | Other related web sites: | ||
− | |||
==References== | ==References== |
Revision as of 18:21, 17 February 2012
Parameter to be measured:
- surface topography
Method:
- terrestrial laser scan
Equipment:
- Laser Scanner
- battery kit
- reflector targets
- software PointScape, PocketScape
optional: handheld operation unit (TSC2), Wireless kit
- Laptop, tripod, additional reflectors (not included)
Advantages:
- nominal currently one of the most precise TLS on the market (angular and distance resolution, laser footprint)
- green laser works better on snow and moist surfaces than IR lasers
- both operation software options PointScape (Windows) and PocketScape (Windows Mobile) are intuitive and well designed
- PointScape enables scanning selected polygons (opposed to rectangular selections)
- support of target spheres (beside flat targets)
- SureScan option: automatic adjustment of angular resulotion during scanning to achieve homogeneous spatial resolution
- carrying backpack enables cross-country transport (not tested)
Disadvantages:
- bulky and heavy: transport in the original box as ordinary flight baggage not possible; carrying in the field is painful
- limited scan distance: typical distance in the field is less than 250 m
- limited scan speed: typical speed < 500 points/s
- poor camera with heavy distortion in live view
- painful selection of scan polygon when spanning more than the current angle of view
- polygon scan area selection not available in PocketScape
- high power consumption: standard battery pack usually lasts 2 - 3 hours, occasional shutdown on low battery without warning observed
- start-up time of ~ 3 min
- runs on 24 Volts - car battery adapter is included, but needs to batteries
- no tilt-mount available; for looking up-/downward, set up scanner inclinated
What to watch out for:
- Laser is not eye safe, take care
- fit of target spheres can be very poor (without warning); verify or repeat in alternative software
- reflective targets seem to be "overexposed" (at least at shorter distances) and cannot be used
- laser beam can partially penetrate PE target spheres
- minimum range ~ 2 m
- cables attached to moving part of scanner - danger of "strangling" during rotation
- check if you really need the handheld operation unit TSC2: operability is usually better on a larger screen of a real laptop
Problems/Questions:
Price:
with Wifi-kit ~ 120000 € (2009, Germany)
Links
Projects that used the above equipment:
Other related web sites: