Direct geomechanical inversion from geodetic data: A new method for a regularised direct inversion to geomechanical parameters using measurements from optical leveling campaigns

Subsidence of the ground surface, caused by hydrocarbon production, compaction of soft ground layers or other subsidence causes, is a timely topic in the Netherlands. Geodetic measurements of the surface can help us improve our knowledge of the subsurface; this process is called geomechanical inversion. Improved knowledge on the subsurface is...

Analyzing subsidence in the Netherlands with attribute-enriched InSAR data

Subsidence is affecting different parts of the Netherlands. The strongest subsidence is observed in the province of Groningen due to ongoing natural gas extraction. Subsidence is also observed at several locations in the province of South Holland, where the processes of peat oxidation, soil compaction and the withdrawal of groundwater are at the...

A way to store, query, update an InSAR spatiotemporal dataset

In SAR interferometry, the data acquired by satellite are large. The points in the dataset are usually expressed in spatial-temporal dimension in which many epochs may be included. Extra information including contextual values and data from other sources sometimes are important to be taken into account when analyzing the deformation based on the...

Investigating the use of C-band phase closure data to produce soil moisture maps

Soil Moisture is a key hydrological variable since it controls the interactions between the atmosphere, biosphere and hydrosphere. It is responsible for the partitioning of precipitation into evaporation, transpiration, percolation and run-off. Soil Moisture monitoring is used to indicate droughts in vegetated areas and is an important parameter...

Community mapped elevation through a low-cost, dual-frequency GNSS receiver: A performance study in Delft (the Netherlands) and Dar es Salaam (Tanzania)

Heavy rainfall, combined with expanding (unplanned) urban settlements in flood prone areas, expose Dar es Salaam (Tanzania) to the risks of flooding. The urbanisation is so rapid in many areas that it is not beneficial to carry out expensive surveys which are quickly out of date. The work carried out by community-mapping project Dar Ramani Huria...

Discrete Frequency Seismology

This work determines whether the amount of frequency components present in the data can be reduced, whilst still retaining image quality, whereas most efforts in seismological research are done in reducing spatial sampling. It is shown using a PCA on the frequency spectra of several data sets that indeed a large redundancy in frequency content...

Deep segmentation of the drivable path of a self-driving vehicle using external data: Influence of domain shift factors and depth information

Robot Care Systems (RCS) is involved in the development of the WEpod, an autonomous shuttle which can transfer up to six people. Based on a predefined map of the environment, the shuttle is able to navigate through mixed traffic its perception sensors such as camera, radar and lidar sensors. This study is acquired in collaboration with RCS and...

Rapid Building Damage Detection Through SAR Timeseries Analysis in the Google Earth Engine: Using Sentinel-1 GRD imagery in the Google Earth Engine to detect Building Damage in Rapid Disaster Response Situations

Humanitarian crises related to building and infrastructure damage, i.e. natural hazards and collateral damage during warfare, result in many hundreds of thousands of casualties on a yearly base. Earthquakes, for example, are responsible for taking around 50.000 lives on a yearly base due to falling debris and collapsing buildings, making them...

Locating potential landing zones with the help of digital surface models

The current procedure of the 11 Air Manoeuvre Brigade (11 AMB) is based on a manual non integrated and slow method that uses only outdated and only topographical data. In the procedure are all 5 aspects of a potential landing zone taken into account, the so called 5S: Slope, Shoots, Surface, Size and Security.<br/>This research led to an...

Locating PS-InSAR derived deformation using LiDAR point clouds

Built mainly on soft soil, the Netherlands is at high risk for the effects of deformation. Interferometric Synthetic Aperture Radar (InSAR) is successfully used to monitor the deformation trends at millimetre level. Unfortunately the InSAR deformation trends suffer from poor geolocation estimates, limiting the ability to link deformation...

Dike deformation near Eemshaven and Delfzijl measured with satellite radar interferometry

It is observed from satellite radar measurements that the dike between Eemshaven and Delfzijl in the north of the Netherlands shows instability. It can be possible that a development of these instability results in dike failure. The two possible failure mechanisms that may occur are settlement and slope-instability. In this research the...

Data assimilation, Geomechanical parameter estimation in the Groningen hydrocarbon reservoir from PS-InSAR measurements with a particle filter

This thesis explores the usage of the particle filter as a data assimilation technique to estimate subsurface processes, such as reservoir volume change from space-geodetic PS-InSAR surface measurements. The specific research area is Groningen, where subsidence is induced by hydrocarbon and salt production.<br/>The satellite radar PS-InSAR...

Mathematical Model Selection for InSAR Deformation Times Series

Satellite radar interferometry (InSAR) techniques can monitor the ground deformation with millimeter precision. With Time-series InSAR (TInSAR) methodology, the ground deformation time series can be derived from InSAR observations. One of the important ways to analyze the InSAR deformation time series is to parameterize the InSAR deformation...

Estimation of InSAR Tropospheric Delay Using ERA-Interim Global Atmospheric Reanalysis

Tropospheric delays are considered to be one of the main performance limitations for Interferometric Synthetic Aperture Radar technology when applied to ground deformation monitoring. In this study, we evaluate the performance of ERA-Interim global atmospheric reanalysis on estimating the tropospheric delay on Sentinel-1 InSAR observations. The...

QUInSAR: Temporal Parameter and Ambiguity Estimation Using Recursive Least-Squares: A Methodology for Persistent Scatterer Interferometry

Parameter and ambiguity estimation in the temporal domain, for arcs of differential phase observations between two persistent scatterers (PS), is a critical part in Persistent Scatterer Interferometry (PSI). Deformation models, used as constraint in the parameter estimation, often do not capture the full extent of the deformation behaviour. This...

Remote Sensing of Japanese WWII airstrips in the Papua Province Republic of Indonesia: Classification of the area surrounding three WWII airstrips (Mongosah, Otawiri and Sagan)

In the Second World War Dutch New Guinea was a strategic battle front for both the Japanese and the Allied forces in the Pacific War. A lot of airstrips were constructed and bombed during this time, of which at least three (Mongosah, Otowari and Sagan) have never been visited after the war. This provided a great opportunity to find potential war...