Engineering Geodesy I
Exam questions of the lecture «Engineering Geodesy I» by Prof. Dr. Ingensand, D-BAUG, ETH Zürich
Exam questions of the lecture «Engineering Geodesy I» by Prof. Dr. Ingensand, D-BAUG, ETH Zürich
Kartei Details
Karten | 59 |
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Sprache | English |
Kategorie | Geographie |
Stufe | Universität |
Erstellt / Aktualisiert | 17.01.2012 / 30.01.2019 |
Lizenzierung | Kein Urheberrechtsschutz (CC0) |
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How can you detect influencing parameters, like temperature?
By measuring them during data acquisition and correlate them to the measurements.
Can geodetic instruments also be used (for crack detection in a building)?
a) Tachymeter an two reflectors on SBB-bolts. b) levelling for sinking problems
What could be the reason for a trend?
* Instrument got warmer
* sinking of the tripod
Frequency measurement:
Acquisition rate of a Totalstation? Possible for this task?
5-7 Hz (leica says: 10 hz) => possible for lower frequencies.
* When the amplitude is to high for ATR without moving it’s good.
* When the tachy has to move => bad.
Frequency measurement:
Acquisition rate of a GPS? Possible for this task?
20 Hz => possible
Differences between geodetic and geotechnical instruments?
[Criteria / geodetic / geotechnical], [Accuracy/ mm (Leveling <0.5mm/km Doppelnivellement) / 2μm - mm], [Range / m - km (VLBI :-)) / μm - m], [Measuring in 2 or 3 dim. / possible with 1 sensor / usually 1 sensor for 1 dim.], [Costs/ ? (high) / ? (low)], [Absolute Measurements (Coordinates) / ✓ / ✕], [Development / for classical survey / specially for those purposes], ]Place of instrument / mostly away of the problem / directly at the problem (crackmeter, plumb)|
What is the easiest and cheapest method (to detect a crack in a wall)?
Plaster-Plate (Gips-Platte), take care that the predetermined breaking point is over the crack!