Monitoring

The surface of the earth is constantly moving. Liftings and lowerings occur wherever fault zones or weakness zones are found in the Earth's crust or human activities have permanently changed the earth.

These processes are often recognized only when damage has already occurred to plants, buildings or roads.

 

Possible causes can be:

  • Mining and strip mining
  • Extraction of crude oil or natural gas, tunnel construction/drift/thrust boring
  • Leaching processes
  • Ground settlement flow
  • Earthquakes, landslides
  • Groundwater lifting/lowering
  • Changes in climate

Synthetic Aperture Radar (SAR) interferometry

With the help of SAR interferometry it is possible to recognize such movements during an early stage.

The basis for this technology is the evaluation of the phase difference of the microwaves reflected from the surface of the earth.

On the one hand, this allows the derivation of very precise elevation models from two images of the same area independently of the weather and time of day. On the other hand, shifting of the terrain can be detected with sub-centimeter precision on the basis of multitemporal data without the need for elaborate and costly terrestrial surveying. Satellite photographs with different resolution and wavelengths are employed.

These enable the tracking of processes that would otherwise require enormous times and expenses. Within a few hours satellites deliver high-resolution images of any point on the earth.

Services

  • Extensive monitoring of lifting, lowering and shifting in the centimeter range
  • Punctiform monitoring of buildings, structural components, etc. in the millimeter range
  • Global acquisition of lifting and lowering processes
  • Detection of processes from the past until now (since around 1992)
  • Derivation of high-precision terrain models from radar images

Advantages

  • High-precision analysis of processes in space and time
  • Two-dimensional acquisition of terrestrial movements
  • Application on a global scale without the need for on-site terrestrial surveying
  • Observation of processes occurring in the past
  • Long term contact-free monitoring
  • Less expensive than terrestrial surveying
  • Centimeter/millimeter accuracy

Your contact partner

Michael Mares

Phone: +49 30 5015060
Fax: +49 30 50150660
michael.mares@trigis.de

Deformation and settlement measurements

Whether for the analysis and visualization of deformations in buildings or for settlement measurements of endangered objects, TRIGIS organizes the corresponding measurement campaigns and delivers the relevant data, in real time as well.

Services

  • Observations of settlement and control points for disposal sites
  • Observations for thrust boring with rail and road facilities
  • Measuring point observation on slopes and embankments
  • Monitoring of cracks in buildings

Your contact partner

Heiko Weist

Phone: +49 36602 1410
Fax: +49 36602 14141
heiko.weist@trigis.de

Precision leveling

We offer deformation and safety measurements especially for industries with high requirements for accuracy (mining, industrial and ordnance surveys). Here we make use of digital precision leveling instruments, "Invar(code)lattenausrüstung", water level gauges and other special accessories.

Services

  • Alignment of leveling nets
  • Analysis of settlement processes
  • Accuracy 0.2 – 0.7mm/km

Vertical inclinometer measurements

Vertical inclinometers are used to determine horizontal surface deformation.

They are most commonly used to keep track of construction pits and construction pit sheeting or monitor slope movements.

To this effect, vertical measuring points are created from inclinometer gauge tubes (drilled) and are measured and evaluated periodically.

Areas of use

  • Earthworks, landslide zones and support walls
  • Dams and embankments (natural and man-made)
  • Bridge piers and bearings
  • Landfills
  • Subsoil movement following tunnel and excavation projects

    Effective ranges: ± 30°, ± 60°, ± 90°
    System accuracy: ± 2 mm over 25 m (for ± 30°

Digital vertical inclinometer measurement system

Services

  • Observation of subsidence and control points in landfills
  • Observation of horizontal drilling for railroad and road infrastructure
  • Measuring point monitoring at slopes and embankments
  • Crack monitoring for structures

Your contact partner

Denis Heinrich

Phone: +49 30 5015060
Fax: +49 30 50150660
denis.heinrich@trigis.de

TRIGIS - THE WORLD OF GEODATA

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