Point cloud based improvement of the trajectory of a Railway Mobile Mapping System

Absolute accuracy plays a crucial role in most geospatial applications. Particularly in the case of mobile mapping systems (MMS) where large amounts of data are collected, it comprises a key factor that can sometimes be dangerously underestimated. Within the scope of mobile laser scanning, the accuracy of the measurements is mainly ruled by the...

Quality Assessment of GNSS/IMU derived NAP heights: using RILA and RDNAPTRANS™2018

The purpose of this thesis is to do quality assessment of GNSS/IMU derived NAP heights for The Netherlands (NAP) using Fugro RILA technique and the RDNAPTRANS2018 published by Rijkswaterstaat. The use of Global Navigation Satellite System (GNSS) is growing rapidly in order to determine the position (both horizontal and vertical). However, the...

Ionospheric errors in GPS: Measuring and modelling the ionospheric delay using single and dual frequency receivers

Accurate weather forecasting plays an important role in predicting precipitation events. With the warming climate the precipitable water vapour in the atmospheric is increasing. Since weather parameters as precipitable water vapor have a high spatial variability, interpolation of water vapor data over an area of hundreds of kilometer does not...

Rainfall Analysis through GPS SNR data in Uganda and The Netherlands: Additional Thesis

Gathering accurate and reliable precipitation data is essential in developing countries, since it applied to a wide range of applications, from improving short term weather models to global climate change research. The most common way of acquiring rainfall measurements is the rain gauge. However, this traditional measurement equipment requires...

Impact of Wrong Ambiguity Fixing on GNSS Positioning

Global Navigation Satellite System (GNSS) has been developed in recent several decades, which provides a new technique for timing, positioning and navigation. And GNSS positioning is a basic service to us, both in daily life and scientific research. During high-precise positioning, ambiguity resolution is a key factor that has a huge influence...

Estimation of horizontal deformation rates based on tachymetric measurements: Processing measurements collected yearly in the geothermal area Bjarnarflag in North-East Iceland from 2015 to 2018

Measurements of a tachymetric network in the geothermal area of Bjarnarflag in North-East Iceland are performed during four consecutive years (2015-2018). For the yearly adjustment of the measurements an alternative iteration scheme to Baarda’s ’B-method of testing’ is proposed, because the level of significance of the F-test performed in the...

Automatic generation of floor plans for indoor navigation using point cloud

This paper describes a methodology for an automated floor plan generation using point cloud captured via Mobile Laser Scanner(MLS) for indoor navigation purposes. The method takes as input a 3D point cloud and using geometrical features, a<br/>ground plane histogram is computed representing the points density using projection. Finally using edge...