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Contents
DIRECTOR STRATEGY & BUSINESS DEVELOPMENT
Durk Haarsma FINANCIAL DIRECTOR Meine van der Bijl TECHNICAL EDITOR Huibert-Jan Lekkerkerk CONTRIBUTING EDITORS Dr Rohan Bennett, Frédérique Coumans CONTENT MANAGER Wim van Wegen COPY-EDITOR Lynn Radford, Englishproof.nl MARKETING ADVISOR Feline van Hettema CIRCULATION MANAGER Adrian Holland DESIGN ZeeDesign, Witmarsum, www.zeedesign.nl
GIM INTERNATIONAL
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P. 12 Recent Trends in Four Lidar Technologies
Lidar technology is synonymous with 3D point clouds. To get the most out of 3D point cloud data, it is necessary to step back and continually consider the newest trends in Lidar technology and how they are benefi ting end users of the data. This article explores the latest developments.
P. 16 Lidar Crop Classifi cation with Data Fusion and Machine Learning
This article outlines research done on creating crop type maps using Lidar, Sentinel-2 and aerial data along with several machine learning classifi cation algorithms for differentiating four crop types in an intensively cultivated area.
P. 21 Lidar or Photogrammetry? Why Not Use Both?
Is it possible to enhance point cloud accuracy and density by merging Lidar with photogrammetry technologies? What effect might neutral density fi lters have on point cloud colours? This article explores quantitative and qualitative point cloud enhancement in more detail.
P. 25 EAASI Continues to Gain Height
More than 40 companies have joined EAASI since the European aerial mapping industry created the not-for-profi t umbrella organization aimed at fostering joint interests less than two years ago. In this interview, the president and secretary-general of EAASI share their views on the association’s role in promoting and simplifying the distribution and use of aerial survey data.
P. 28 Building a 3D World: Common Sources of Elevation Data
As the demand for elevation data continues to rise, it is important that users match the level of reliability, accuracy and resolution of the data to their specifi c application to arrive at an appropriate and cost-effective product. This article outlines the common sources of elevation data, including spacebased radar, and helps to categorize the data quality and accuracy.
P. 3 Contents P. 5 Editorial P. 7 Headlines P. 32 Organizations
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COVER STORY
This year’s third issue of GIM International is dedicated to aerial mapping. With a mix of content focusing on the latest in both photogrammetry and Lidar mapping technology, we aim to give you an overview of the current possibilities. We also shine a light on the benefi ts of capturing the environment with a manned aircraft.
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