Creating a Satellite-data Integration System

The Importance of International Standards
CEOP (Coordinated Enhanced Observation Period) is currently working on an integrated global water and energy-cycle observation system for scientific and civilian use. One challenge is the creation of a satellite-data integration system able to combine a multitude of data stemming from a diversity of distributed systems. Data retrieval and combination requires high-performance distributed data-management and archiving systems. But the key is specification of metadata, for which international standards are indispensable. The prerequisites for developing a Satellite-Data Integration System (SDIS) are, next to specification of metadata, data discovery and data integration, geocoding service and data quality control, and standardisation of image-service... (read more)
2006-11-20 12:00:00

Adapting 3D Laser Scanning for the Surveyor

Meeting Specific Needs to Increase Productivity
3D laser scanning is a powerful measurement technology for obtaining 3D coordinates of object points at a speed of up to 5,000 points per second. But surveyors see lack of scanner versatility and unfamiliar workflow as limiting factors. Today, increased portability and robustness and adapted workflow enable surveyors to easily incorporate 3D scanning into their portfolio. A short learning curve allows for increased productivity and creates new business opportunities. Today 3D laser scanning is based either on phase-shift or on time-of-flight measurement. Phase-shift technology works by sending a laser beam with a sinusoidal wave to the centre of a rotating... (read more)
2006-09-21 12:00:00

Mobile Road Mapping in Cameroon

Supporting Water Utilities Renewal
In Yaoundé, Cameroon, little cartographic data of the road network, public assets and utilities is available. To efficiently renovate the city’s drinking water network, mobile mapping technology was used, taking extra care to ensure planimetric accuracy near the equator. It provided the GIS data for the road maps needed for the project planning. The experimental methodology used – with GIS and web suites integrated in the network construction project at all stages – was a good fit with the current African context and offers promising potential for future projects. The Cameroon Water Utilities Corporation and Water Cameroonian are jointly in... (read more)
2016-11-17 09:46:32

Good ASPRS 77th Annual Conference

The American Society for Photogrammetry and Remote Sensing (ASPRS) 2011 Annual Conference was held 1st to 5th May at the Frontier Airlines Center in Milwaukee, Wisconsin with many and varied conference activities and an attendance of over 1,100.   There were eleven workshops held on the two days preceding the conference covering a wide array of topics including, Professional Airborne Digital Mapping Systems - An Overview; Looking Above the Terrain: Lidar for Vegetation Assessment; State-of-the-Art Automated Linear Feature Extraction for a Production Environment; Object-Based Image Analysis; Lidar Waveform: The Potential and Benefits for Topographic Mapping and Making SAR Accessible.  ... (read more)
2011-05-18 12:10:26

Landslide Hazard Mapping in Austria

Using GIS to Develop a Prediction Method
In Austria many manmade objects such as roads and buildings are vulnerable to landslides caused by heavy rainstorms. These result from climate change and changes in geological structure. Using GIS, the authors analysed the characteristics of landslides and developed a prediction method. Recent events have demonstrated how the method can support decision-makers in urban and regional planning. Population growth and changes in land-use policy result in increased hazard risks. For example, lack of risk awareness causes governments to allow the building of houses in potential hazard zones. As yet, little is known about the distribution of landslides. Figure 1 shows... (read more)
2006-11-20 12:00:00

Micrometre-level Deformation Monitoring of a Concrete Dam

Accurate and Frequent Deformation Monitoring Using Fibre-optic Cables
Highly accurate measurements with a high temporal resolution have always been a challenge, especially for locations that are hard to reach since conventional geodetic deformation methods are often unsuitable for such locations. With fibre-optic deformation monitoring, cables can be embedded in an object and left alone to provide permanent deformation monitoring measurements. Such a system was installed in a dam in Austria to provide insight into the expansion of joints inside the dam when the reservoir level changes. Hydroelectric power plants are an important source of energy in mountainous regions. The large reservoir lakes behind dams often create a picturesque... (read more)
2017-12-20 11:01:10

Camera Laser Scanner

Geo-knowledge for Preservation of St Maria Maggiore, Italy
Image-based modelling is still the most widely used approach in building documentation and 3D investigations, but panoramic camera laser scanners are gaining in importance. They offer large fields of view, good accuracy and direct photo-texturing. The authors have tested the information content and performance of such systems in 3D modelling of St Maria Maggiore, the ancient church in Bergamo, Italy. Technology is moving towards the development of an automated hybrid measurement system that may be called the "panoramic camera laser scanner", consisting of a Lidar device solidly integrated with a calibrated digital camera. Such new devices collect spatial point-clouds and,... (read more)
2007-07-07 12:00:00

UAVs in the Mining Industry

Capturing the Andalusian Mina de Aguas TeƱidas
A growing number of mining companies are employing unmanned aerial vehicles (UAVs). Equipped with digital cameras, such remote-controlled small aircraft generate high-resolution aerial imagery which can be further processed to produce highly precise orthophotos, point clouds and 3D models. Surveyors and engineers can use this data to make statements and forecasts about the development of the mine, document changes as well as calculate volumes of spoil and stockpiles. In mines with both aboveground and underground areas, UAVs can provide important information about the state of the aboveground area, thus improving the safety of the workers underground. This was practised in... (read more)
2015-11-26 10:59:41

Laser Scanner in a Backpack

The Evolution towards All-terrain Personal Laser Scanners
Evolution of Laser scanning: new prototype which can be held in a backpack for rugged terrain. Laser scanning systems have gone through a major evolution in the past decade. After the initial breakthrough of airborne laser scanners (ALS), other types of laser scanning systems have emerged, most notably terrestrial laser scanners (TLS) and mobile laser scanners (MLS). While these three main types of Lidar systems together serve a large number of applications, none of them are optimised for fast and flexible scanning in challenging locations, rugged terrain and complicated urban structures. Personal laser scanners (PLS) fill this void and are now evolving towards compact, agile and flexible solutions for mapping complex environments. This article explains the... (read more)
2016-02-15 10:57:34

Hybrid UAS/UAV: Fixed Wing and Chopper in One Aircraft

A hybrid UAS/UAV combines the best of two worlds: the benefits of a fixed wing and chopper in one aircraft. Unmanned airborne systems (UASs) – aircraft which fly without human pilots on board – have soared in popularity as surveying devices. Today they are applied in a wide variety of 2D and 3D mapping, inspection and monitoring tasks. So far there have been two broad categories: fixed wings and multicopters. However, recent advances have led to a third category: the hybrid UAS/UAV, which combines the best of both worlds. Sensors and battery After flight, the recorded GNSS and IMU data is usually used to georeference the sensor data. The sensors on board include RGB cameras, near-infrared (NIR) cameras, thermal infrared (TIR)... (read more)
2015-11-24 10:48:34
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