BIO
Study of Geodesy (1991), Ph.D. on Building reconstruction by combination of height and image data (1996), Habilitation in Photogrammetry (2004), Appointment as Associate Professor at University of Stuttgart (2009). currently deputy head of Institute for Photogrammetry, University of Stuttgart.
Professional Activities (selection): Working group head “Sensors and platforms” German Society for Photogrammetry, Remote Sensing and Geoinformation (DGPF), Team head “Digital Elevation Models” during the DGPF-project on Digital Photogrammetric Camera Evaluation (2008 - 2010 ), head ISPRS-Working group I/2 - LIDAR, SAR and Optical Sensors for Airborne and Spaceborne Platforms .
Research Areas: Photogrammetry, Computer Vision, Laserscanning

ABSTRACT
Results of the EuroSDR Benchmark ‘3D Dense Image Matching’
Recent innovations in matching algorithms in combination with the increasing quality of digital airborne cameras considerably improved the quality of elevation data generated automatically from aerial images. Meanwhile, dense matching of multiple overlapping aerial images can provide 3D point clouds at accuracies and densities, which could not be expected until recently. This development motivated the launch of the EuroSDR project “3D Dense Image Matching’. The test provides a platform for active participation of software developers, distributors and users of dense matching software. The general aim is to compare the quality of elevation data produced by different participants and/or software systems for two test areas – a more rural region with different landuse and an inner city area. The paper will introduce the test and its motivation and presents some results to provide an overview in the state of the art of high quality 3D data generation from dense image matching.

BIO
Graduated as Geodetic Engineer from Delft University of Technology in 2000, and finished his PhD on the Acquisition of 3D Topography in March 2010. After his master research on the classification of airborne laser scanner data, he joined the Section of Photogrammetry and Remote Sensing as researcher on 3D reconstruction from line scanner imagery. From 2001 till 2005 he worked as research consultant and project manager at the Survey department of Rijkswaterstaat in Delft. His tasks were to assess and to improve quality for airborne, terrestrial and hydrographic data acquisition projects. During his PhD he examined how to fuse 2D map data with airborne laser scanner data to generate 3D topographic models. From September 2009 Sander holds a position of assistant professor at the department of Earth Observation Science at ITC.
Professional Activities (selection): Chair of ISPRS Working group III/2 on Point Cloud Processing. Awards: RGI Innovation Award in the category science (2007), ISPRS Best paper award for young authors (2008), ITC Research award (2009). R&D: Main research responsibilities are (semi-) automated acquisition of (3D) geo-information. Point clouds processing (segmentation, classification, feature extraction) from airborne, mobile and terrestrial platforms.

ABSTRACT
The fusion process of lidar and map data to generate 3D city and landscape models
This paper deals with two projects how to generate nationwide 3D city and landscape models using national datasets. The two flavours are large scale (1:1.000) and medium scale (1:10.000). Dense airborne lidar data is combined with a topographic map to generate a 3D model of the solid terrain and buildings. This paper describes how to develop a workflow that combines the strengths of the map, e.g. boundary location, shape and function of an object, with the dense 3D point information from the lidar data. In this paper we focus on the decisions that have to be made in the workflow from 2D to 3D. The following research questions will be discussed: which lidar points have to be used to transfer the height to an object, how to use the semantics of the map data, how to assign a height to a point, boundary or surface, what is the quality of that height, how to deal with noise in both the map and lidar data? Examples, decisions and applications for both the large and medium scale maps are presented. As an example application we show how the detailed 3D map can be used in hydrological applications. In conventional methods important information on curbstones and other important water obstructers is lost during the interpolation from irregular point data to a grid structure. We show that using an object based 3D modeling approach, important hydrological features are kept, making it possible to accurately predict the water flow at the most crucial locations.

ABSTRACT
3D implementation at national level in The Netherlands
Over the past ten years technologies for generating, maintaining and using 3D geo-information have matured. Yet many organisations face challenges in introducing 3D in their day-to-day processes. Despite the practical difficulties, it is clear that 3D information is becoming increasingly important in many applications. In The Netherlands it has been recognized that advances in the 3D domain are necessary at the national level. These advances can only be realised by support and cooperation of a broad base of technology providers and users in the public, private, academic and research sectors. The four national organisations that helped establish such a collaboration network are the Kadaster, Geonovum [the National Spatial Data Infrastructure (NSDI) executive committee in the Netherlands], the Netherlands Geodetic Commission and the Dutch Ministry of Infrastructure and Environment. The resulting "3D Pilot NL" has brought together over 100 private, public and scientific organisations. Those organisations consist of (large) municipalities, provinces, universities, GIS and DBMS vendors, 3D data suppliers, and engineering companies. A major result of the pilot is the proof of concept for a 3D SDI, covering acquisition, standardisation, storage and use of 3D data in various use cases. Also, it was demonstrated that 3D information automatically generated from laser point data can easily become part the Open Geospatial Consortium standard for 3D city and landscape modelling “CityGML”. The findings of the pilot were formally established in a national 3D standard realised as a CityGML Application Domain Extension (ADE).In a follow-up project tools have been developed and documents have been written to further support the implementation of this standard. The proposed paper will describe these tools and documents, which include:An example tendering document to acquire 3D information according to the new 3D standard; example 3D data compliant to the standard; a 3D validation tool; a guideline to update and maintain 3D data; a website that collects 3D killer applications that serve as inspiration for new 3D applications; and, recommendations to align CityGML with Building Information Models.

BIO
Graduated in Nature and Landscape Engineering at Van Hall Larenstein University of  Applied Sciences, and finished his MSc in 2006. After graduating he started working at the Dutch Kadaster as a Senior GIS Specialist. During his career Marc successfully completed the study UniGIS at the Free University in Amsterdam.
R&D:
Main research is a fully automated generalization of the key register topology (BRT). The focus of the generalization is on the phase between 10K and 50K data.
Processing a full 3d Top10NL (10K) with information out of lidar data.

ABSTRACT
EuroSDR Session 3D - The Next Challenge of National Mapping
The introduction of new concepts and techniques will trigger a new era for the production and dissemination of GEO-information within Kadaster Netherlands. The new innovative approaches will change the production methods for geo information dramatically. Traditional cartographic values regarding originating paper chart use will be emancipated. Customer value regarding usability and the currency of the information in relation to a more volatile use of small-scale maps in web services will prevail. In addition 3D data will widely be spread generating new applications domains and the need for new production techniques.  To meet these new challenges it is necessary to change the DNA of the National Mapping Organization. An organization should be Fit for Change. Traditional structured organisations will not be able to cope with the pace of current changes. One of the Key-success factors is flexibility that will be achieved by an In-Flow production system with a short lead-time for process steps. Kadaster Netherlands started in 2011 with the introduction of LEAN manufacturing concept within the production of GEO-information. This approach has led to spectacular results concerning integral actuality and quality of geo-information products. Also, a fully automatic generalization process will replace the traditional cartographic generalization where old Map specifications are partially emancipated. And as third step, the current 2D base level data TOP10NL will incorporate z-values to achieve a countrywide basis 3D database on a 1:10.000 scale.  A sustainable simple process flow with high tech components also demands a new kind staff and management organization. It appears that traditional Cartographers are no longer needed. The multi disciplinary approach askes for advanced knowledge related to ICT and GEO modelling and production concepts and techniques and a will create a new business logic. Highly qualified staff will work with modelling techniques and flexibly designed concepts in expert teams throughout a product LiveCycle.