Prepping for radar vision

Prepping for radar vision
This ‘interferogram’ shows Petermann Glacier grinding towards the sea along the northwestern coast of Greenland. Two Radarsat-2 TOPS images acquired 24 days apart were used to generate it. Radarsat-2 was programmed specially by MDA to work in an experimental imaging mode called Terrain Observation by Progressive Scans (TOPS) in azimuth  to match the way ESA’s Sentinel-1 will image Earth. Credit: ESA/MDA

Sentinel-1A, Europe's first satellite for Copernicus, is almost ready for launch on 3 April. Meanwhile, ESA is showing how its advanced radar will map ice, monitor subsidence and much more.

Marking a new era in Earth observation focusing on operational applications, Sentinel-1A is set to deliver timely imagery for numerous Copernicus services.

Carrying an advanced radar, it will scan Earth's surface no matter what the weather and regardless of whether it is day or night.

In crisis situations, it will be used for rapid response to disasters such as floods and earthquakes. Its radar will routinely monitor shipping zones, map sea and provide information on winds and waves for , track changes in the way land is being used, and monitor subsidence.

It will also track how glaciers move, as shown in the image above of Petermann Glacier in northwest Greenland.

So that users are fully prepared for the images Sentinel-1A delivers, Canada's Radarsat-2 was recently programmed by MacDonald, Dettweiler & Associates to scan Earth's surface using the same novel 'interferometric' wide-swath mode technique as Sentinel-1. Consequently, a suite of images was acquired over various sites.

Carrying an advanced radar, Sentinel-1 can image Earth’s surface no matter what the weather and regardless of whether it is day or night. This makes it an ideal mission for monitoring the polar regions, which are shrouded in darkness for months at a time. As well as providing information on changing ice cover and glacial flows, Sentinel-1 will provide imagery of sea-ice for maritime navigation in polar waters. Sentinel-1 will also be used to track changes in the way land is used and to monitor ground movement. Moreover, this new mission is designed specifically for fast response to aid emergencies and disasters such as flooding and earthquakes. Sentinel-1, the first in the family of satellites for Europe’s environmental monitoring Copernicus programme, marks a new era in Earth observation, focusing on operational missions to support users for decades to come. Credit: ESA/ATG medialab

As the most realistic Sentinel-1-like images to date, they show the performance and suitability of the new mission for classifying different types of sea ice, detecting ships and monitoring oil platforms.

They also included image pairs to show changes in glaciers such as Petermann, and a 'stack' of 11 images to map surface subsidence in Mexico City.

The image of Petermann Glacier was derived from two taken 24 days apart. It shows some stationary and slowly moving features, as well as some large areas of much faster-moving ice. The pattern's fringes are widely spaced in the stationary areas and closer together in the centre of the glacier where the ice is moving much faster.

The wealth of data available through ESA's Earth observation campaign data website is helping to pave the way for users to get the maximum out of the upcoming mission.

The Sentinel-1mission comprises two identical satellites for optimal global coverage and data delivery. Sentinel-1B will join Sentinel-1A in orbit next year.

Citation: Prepping for radar vision (2014, March 19) retrieved 21 May 2024 from
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