From Urban to Rural: Enabling Sustainable Urban Planning and Development Using Satellite Imagery

It is estimated that 55% of the world’s population lives in urban areas.  This number is expected to increase to 68% by 2050. Studies have shown that urbanisation combined with the overall growth of the world’s population could add another 2.5 billion people to urban areas. This growth proposes a challenge for today’s urban planners. A challenge that can be aided, by incorporating Very High Resolution (VHR) optical satellite imagery into their planning. This rapid rate of change challenges urban planners to ensure efficient city infrastructure management whilst minimising the impact on the surrounding environment. Satellite imagery provides urban intelligence... (read more)
2020-06-02 10:38:34

Integrating UAV-based Lidar and Photogrammetry

Dense 3D Point Cloud Generation with Ultra-high Precision
Recent unmanned aerial vehicle (UAV or ‘drone’) platforms jointly collect imagery and Lidar data. Their combined evaluation potentially generates 3D point clouds at accuracies and resolutions of some millimetres, so far limited to terrestrial data capture. This article outlines a project that integrates photogrammetric bundle block adjustment with direct georeferencing of Lidar point clouds to improve the respective accuracy by an order of magnitude. Further benefits of combined processing result from adding Lidar range measurement to multi-view-stereo (MVS) image matching during the generation of high-precision dense 3D point clouds. The project was aimed at the area-covering monitoring of potential subsidence... (read more)
2020-05-19 02:33:35

KlauPPK Usage Leads to Changes in GCP Regulations in Japan

Japan’s Ministry of Land, Infrastructure, Transport and Tourism has rewritten its UAV capture specifications based on results using KlauPPK technology. The guideline for work-type management using aerial photogrammetry (earthwork), which outlines the procedures to be used to perform aerial surveys, has until now specified that surveyors must “set up ground control points every 100m”. When KlauPPK technology is deployed, the use of GCPs is now optional. The tests conducted by GeoLink Japan proved that +/-5cm XYZ accuracy can be achieved without GCPs, as verified with check points. This improves the work efficiency and productivity across sites in Japan including public... (read more)
2020-05-16 02:48:55

Contribution of Hydrography towards Sustainable Water Management

FIG Commission 4: Hydrography
The 2019-2020 year has been a busy one with the Working Groups of Commission 4 focussing on representing FIG at a number of events and forum to gain insight to develops generally and also to deliver and present on the work of FIG. Through all its Working Group, Commission 4 has been actively involved in implementing its policy by working in close cooperation with relevant organisations and institutions. Altogether there are four (4) Working Groups for Commission 4 as listed below: WG 4.1 – Standards and Guidelines for Hydrography WG 4.2 – Blue Growth & UN Sustainable Development Goal 14... (read more)
2020-05-11 10:41:18

Mapping the Yangtze River

One Local Authority, 400kmĀ², 21,000 Images and One Map
The Zhenjiang Municipal Flood Control Bureau is a short walk from the Yangtze River: staff can clearly see the river from the office. In July 2019, a massive orthophoto was created from 21,000 images, representing 400 square kilometres. Before this, the region's flood planning maps, water conservation data and related information were stored as separate, discrete files. For such a big project, the team needed to bring all these together with a custom base map. Zhenjiang is a transport hub lying on the southern bank of the Yangtze River near the Grand Canal, and at constant risk of floods. The... (read more)
2020-05-07 09:41:07

Ask the Specialist: GPS Signal Tracking

We received the following question from one of our readers: “While researching GNSS receiver specifications for various survey-grade products, I’ve observed that some of them list the following GPS signal-tracking capabilities: ‘L1P, L2E’. I have not been able to find a reference to these specific signal frequencies. Are they brand-new frequencies that may not be listed in the various signal specifications available online and/or could they be just ‘window dressing’ that really has no bearing on the signal tracking and performance of the product?”. We passed this question on to Huibert-Jan Lekkerkerk, contributing editor at 'GIM International' and an expert on GNSS... (read more)
2020-04-30 10:10:10

GNSS Positioning at Centimetre Level for Dynamic Applications

Global Augmentation Services Support Driverless Vehicles
Mobile mapping, automated machine guidance and other dynamic applications employ global navigation satellite system (GNSS) receivers for positioning. To obtain centimetre-level positioning accuracies, augmentation services are needed to correct for atmospheric signal disturbances, clock errors and satellite orbit deviations. A major limitation of many solutions is that accuracy comes at the expense of long convergence times, which impedes the application in high-precision dynamic applications. This article outlines a solution based on global augmentation services. Precise positioning at the centimetre level cannot be achieved using GNSS signals alone. In addition, augmentation systems are needed. These consist of a network of base... (read more)
2020-04-23 08:44:17

Satellite Imagery of COVID-19 Testing Facilities in Munich, Germany

On 19 March 2020, European Space Imaging collected imagery of the COVID-19 drive-through testing facilities that have been erected at Theresienwiese in Munich, Germany. The imagery was captured with WorldView-3 at True 30cm in full colour. It shows the six drive-through testing tents and over 60 cars waiting in line for testing. Testing at this facility is only open to people who are deemed by the Statutory Health Insurance Physicians in Bavaria (KVB) to have a reasonable likelihood of being infected with coronavirus. Satellite image ©2020 European Space Imaging. (read more)
2020-03-20 01:21:14

MakeItAccurate: A Revolutionary Global GNSS/INS Correction Service

Enterprise operations adopting geospatial technology require high accuracy in their digital twins to make them a viable alternative to the real world for measurement and inspection. The challenge is to achieve accuracy with one simple, repeatable, scalable workflow across global assets at massive scale. MakeItAccurate makes very high accuracy simple, accessible and reliable, anywhere. According to the developers, this is an industry game-changer.  The need for high accuracy positioning has traditionally been the realm of surveyors and engineers. It’s what makes geospatial data valuable. New technology, such as drones, are now bringing geospatial to a broader range of sectors such as insurance,... (read more)
2020-03-19 10:41:59

How High-altitude Propellers Allow Mapping of Large Areas with High Accuracy

Wingtra is introducing high-altitude propellers which enable a professional mapping drone to capture data more than 2,500m (8200ft) above mean sea level (AMSL) with unprecedented accuracy and coverage. Customers in South America, China, Central Europe and other regions with high altitudes can now map high terrain at down to 1cm ground sample distance (GSD). Specifically, the new high-altitude propellers and supporting software allow take-off at altitudes of up to 4,800m (15,700ft) AMSL and flight at altitudes of up to 5,000m (16,400ft) AMSL. “It’s a game-changer for our customers to fly and gather data on terrain that has so far been... (read more)
2020-03-04 08:47:39
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