Knowledge base

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Kanaalweg 4: 130 years the geodetic heart of the Netherlands

  • Knowledge base
  • Geodesy and reference systems

On the beautiful Kanaalweg in Delft, on the edge of the TU area, stands a striking building that has played a central role in the world of geodesy since 1895. Where Ingenieursbureau Geodelta is located today, professors, government officials and researchers previously worked on the foundations of the Dutch geo-information domain. This is the story of Kanaalweg 4: a place where science, technology and history come together.
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Delft Method for adjustment and testing

  • Knowledge base
  • Geodesy and reference systems

The Delft Method for Adjustment and Testing, also known as the Delft School, is a methodology within geodesy developed at the Delft University of Technology between 1930 and 1980. Under the leadership of Jacob Menno Tienstra and Willem Baarda, methods were formulated that radically improved the quality of geodetic measurements.
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Point clouds from photographs

  • Knowledge base
  • Photogrammetry

Measuring in photographs requires detecting the same point in multiple photographs. Doing so for each pixel creates a very dense set of measurements: a point cloud. This technique is called Dense Matching.
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Measuring with drones

  • Knowledge base
  • Photogrammetry

Cameras and laser scanners can be mounted on many types of platforms. Nowadays, drones - called Unmanned Airborne Systems (UAS) by professionals - are also wildly popular because of their great flexibility and usability for many kinds of projects.
Amersfoort

Measuring in pictures

  • Knowledge base
  • Photogrammetry

Measurement in photographs - photogrammetry - is a field that originated around 1850 and has developed over time into an advanced measurement technology. This article describes the basics of this measurement technology.
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Point clouds from Laser Scanning

  • Knowledge base
  • Laser scanning

Laser scanning has become a widely used measurement technique for projects requiring three-dimensional (3D) models of objects. The basis of 3D models are point clouds consisting of a collection of X,Y,Z coordinates.
Gravendijkwal

Quality aspects of Laser point clouds

  • Knowledge base
  • Laser scanning

Obtaining accurate X,Y,Z coordinates from laser points requires many measurement facilities such as GNSS, IMU and control points. Several measurement aspects determine the usefulness of a point cloud. This article discusses the main ones.
Galileo

How do GNSS and IMU work?

  • Knowledge base
  • Geodesy and reference systems

In moving platforms such as cars and drones, the position and orientation of the sensors are determined with GNSS and IMU respectively. In this article, we explain how these techniques work.