Landsat: the Cornerstone of Global Land Imaging

Advancing the Understanding of Planet Earth
The use of data from Landsat satellites has become a cornerstone of global land imaging with broad societal benefits. More real-time monitoring capability in the future will further our understanding of a changing Earth. The Landsat satellites provide an uninterrupted space-based data record of the Earth’s land surface to help advance scientific research towards understanding our changing planet. In this article, the authors look at how the use of data from Landsat satellites has evolved over time to become a cornerstone of global land imaging with broad societal benefits. They conclude that the Landsat archive is poised to shift into... (read more)
2019-02-20 11:32:34

The Increasing Importance of Satellite-derived Bathymetry

Effective Surveying Tool For The Shallow Water Zone
Bathymetric data in the shallow water zone is of increasing importance to support various applications such as safety of navigation, reconnaissance surveys, coastal zone management or hydrodynamic modelling. A gap was identified between data demand, costs and the ability to map with ship and airborne sensors. This has led to the rise of a new tool to map shallow-water bathymetry using multispectral satellite image data, widely known as Satellite Derived Bathymetry (SDB). Read on for an article providing an overview of the SDB methods, showing how data can be integrated into survey campaigns and highlighting three use cases. (By Knut Hartmann,... (read more)
2017-05-04 09:40:17

Geomatics and Surveying in Support of Land Administration

Implementing Tenure Security for All
Today’s geospatial technology means that land administration systems can increasingly be implemented for the benefit of all. It is now possible to conceive approaches to capturing the unrecorded geometry of boundaries for the billions of unrecognised land interests or spatial units. In addition, new approaches are becoming apparent for the maintenance of collected data. Examples from the field show that we’re well on the way to responding to the challenge. From a geomatics and geoscience perspective, many tools are already available to support development, but further steps are needed to operationalise them at scale. Read on for an article investigating a... (read more)
2017-03-07 11:14:08

Canada Applies Open Data Cube Technology to Assess Nationwide Land-use Change

Canada’s Pollutant Inventories and Reporting Division (PIRD) faces the massive task of creating a greenhouse gas inventory for the entire nation. A key part of this analysis is the use of remotely sensed data to quantify areas of land-use change to calculate CO2. In this pursuit, PIRD has partnered with PCI Geomatics in a project that leverages Open Data Cube technology to enhance the efficiency, accuracy and granularity of analysing enormous volumes of multi-temporal remote sensing data on a nationwide scale. Each year in Canada, thousands of hectares of farm fields and forests are transformed into different land-use classes, most... (read more)
2020-03-11 11:30:31

ASPRS Honorary Members Selected

Clifford W. Greve and Vincent V. Salomonson have been selected as the next Honorary Members of the American Society for Photogrammetry and Remote Sensing (ASPRS). Their nominations were recently approved by the ASPRS Board of Directors. This is the highest award bestowed by ASPRS and there can be only 25 living Honorary Members of the Society at any given time. Initiated in 1937, this lifetime award is given for professional excellence in recognition of individuals who have rendered distinguished service to ASPRS and/or who have attained distinction in advancing the science and use of the geospatial information sciences. Greve and... (read more)
2012-11-15 09:12:20

Establishing an Operational SBAS Down Under

From Test-bed to Operational System
The Australasian region took a major step towards gaining its first-ever satellite-based augmentation system (SBAS) in early 2017. That is when the governments of Australia and New Zealand agreed to fund a two-year test-bed to evaluate the benefits of SBAS technology across a number of industry sectors in the region. The highly successful test-bed ran from 2017 to 2019 and built the case for the governments of both countries to fund an operational SBAS. SBAS is inherently an aviation technology, originally designed to help aircraft with vertical guidance during landing approaches. It was first developed in the USA (WAAS), followed... (read more)
2020-01-21 01:11:16

UAV Spectral Image Mapping of Shoreline Vegetation

Identification Based on Visible Spectral Bands
An affordable DJI Phantom 3 drone with built-in camera, which collects data only in the visible spectral bands, has been used to identify shoreline, vegetation and water. Rapid identification of a clear water surface, shoreline and vegetation can serve as a means of water-level monitoring and as an important indicator of changes. In cases when a high level of detail or on-demand data collection is required, unmanned aerial vehicles (UAVs or ‘drones’) can provide a good service. It is important to think about the costs of the UAV and the connected sensors as well. Multispectral and thermal cameras are still... (read more)
2018-07-04 10:08:27

Advanced Urban 3D Modelling and Visualization

A Generic Workflow for Automatic Building Detection and 3D Modelling
The automatic detection, data extraction, 3D modelling and visualization of buildings in urban areas using remote sensing data is an essential task in various applications such as cadastre, urban and rural planning, change detection, mapping, updating geographic information systems, monitoring, housing value and navigation. Even today, this task still remains challenging due to the inherent artefacts (e.g. shadows) in the remote sensing data used, as well as the differences in viewpoints, surrounding environment, complex shape and size of the buildings. This article outlines a generic workflow using modern technologies. Besides the recent developments in image processing, advances in computer vision... (read more)
2020-09-18 01:09:28

InSAR Used to Create Ground Stability Maps

Zooming on a Groundbreaking Revolution
Satellite radar interferometry (InSAR) is a technique that can measure millimetre-scale movement of the ground from space. It does this by comparing the return echoes, and thus the signal-path length, from two or more radar images taken over the same place, over time. Modern InSAR is now used by a range of industries concerned with ground or structural stability, from building development and control, to oil and gas production, to mining, to road and rail management. This article explains some key aspects of InSAR technology, including its innovative use to produce ground stability maps. Phase Shifters InSAR is based upon... (read more)
2019-03-07 05:09:42

Satellite Monitoring Reveals Slow Flow Thinning for Glaciers in Asia

Providing water for drinking, irrigation and power, glaciers in the world’s highest mountains are a lifeline for more than a billion people. As climate change takes a grip and glaciers lose mass, one might think that, lubricated by more meltwater, they flow more quickly. However, satellite images from over the last 30 years show that it isn’t as simple as that. A paper published recently in 'Nature Geoscience' describes how a multitude of satellite images reveal that there has actually been a slowdown in the rate at which glaciers slide down the high mountains of Asia. High-mountain Asia stretches from... (read more)
2018-12-13 10:43:12
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