Difference between revisions of "Topography - Terrestrial Laser Scanner Trimble GX"
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==Parameter to be measured:== | ==Parameter to be measured:== | ||
* surface topography | * surface topography | ||
| + | * snow cover | ||
[[Image:trimble_gx.jpg]] | [[Image:trimble_gx.jpg]] | ||
| + | |||
==Method:== | ==Method:== | ||
* terrestrial laser scan | * terrestrial laser scan | ||
| Line 8: | Line 10: | ||
* Laser Scanner | * Laser Scanner | ||
* battery kit | * battery kit | ||
| − | |||
* reflector targets | * reflector targets | ||
| − | optional: Wireless kit | + | * software PointScape, PocketScape |
| + | optional: handheld operation unit (TSC2), Wireless kit | ||
| + | * Laptop, tripod, additional reflectors (not included) | ||
==Advantages:== | ==Advantages:== | ||
| − | * nominal currently one of the most precise TLS on the market (angular and distance resolution, laser footprint) | + | * nominal currently (2009) 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 | * 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 | * both operation software options PointScape (Windows) and PocketScape (Windows Mobile) are intuitive and well designed | ||
| − | * PointScape enables scanning selected polygons (opposed to rectangular selections) | + | * PointScape enables scanning selected polygons (opposed to rectangular selections, saves time) |
* support of target spheres (beside flat targets) | * support of target spheres (beside flat targets) | ||
| − | * carrying backpack enables cross-country transport (not | + | * SureScan option: automatic adjustment of angular resolution during scanning to achieve homogeneous spatial resolution |
| + | * carrying backpack enables cross-country transport (not including tripod, batteries and targets) | ||
==Disadvantages:== | ==Disadvantages:== | ||
| Line 24: | Line 28: | ||
* limited scan distance: typical distance in the field is less than 250 m | * limited scan distance: typical distance in the field is less than 250 m | ||
* limited scan speed: typical speed < 500 points/s | * limited scan speed: typical speed < 500 points/s | ||
| − | * poor camera with heavy distortion in live view | + | * poor camera with heavy distortion in live view; bright scenes (snow under sun) can appear completely blinded |
* painful selection of scan polygon when spanning more than the current angle of view | * painful selection of scan polygon when spanning more than the current angle of view | ||
* polygon scan area selection not available in PocketScape | * 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 | * 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 | * start-up time of ~ 3 min | ||
| − | * runs on 24 Volts - car battery adapter is included, but needs | + | * runs on 24 Volts - car battery adapter is included, but needs two batteries |
| − | * no tilt-mount available; for looking up-/downward, | + | * no tilt-mount available; for looking up-/downward, though setting up scanner inclinated on tripod is possible within limits |
==What to watch out for:== | ==What to watch out for:== | ||
| Line 37: | Line 41: | ||
* reflective targets seem to be "overexposed" (at least at shorter distances) and cannot be used | * reflective targets seem to be "overexposed" (at least at shorter distances) and cannot be used | ||
* laser beam can partially penetrate PE target spheres | * 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:== | ==Problems/Questions:== | ||
| Line 45: | Line 52: | ||
==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== | ||
| − | + | [[Image:TribleGX_Panorama.jpg]] | |
[[Category:Equipment]] | [[Category:Equipment]] | ||
Latest revision as of 09:50, 26 April 2013
Parameter to be measured:
- surface topography
- snow cover
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 (2009) 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, saves time)
- support of target spheres (beside flat targets)
- SureScan option: automatic adjustment of angular resolution during scanning to achieve homogeneous spatial resolution
- carrying backpack enables cross-country transport (not including tripod, batteries and targets)
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; bright scenes (snow under sun) can appear completely blinded
- 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 two batteries
- no tilt-mount available; for looking up-/downward, though setting up scanner inclinated on tripod is possible within limits
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:
References
