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Introduction

About SILLE

Ground motion is the movement of the earth’s surface and can be caused by seismic strain, landslides, and mining or landfill activities. This critically affects infrastructure and is a key component in disaster risk assessment and management

SILLE space based measurement and monitoring service provides regular and reliable information about natural and anthropogenic ground motion phenomena across the world.

In addition to ground & infrastructure displacement measurements SILLE offers:

Key Value Points

Why choose SILLE?

  • keyboard_arrow_right Coverage of the entire world
  • keyboard_arrow_right Works 24/7 in all weather conditions
  • keyboard_arrow_right Increase inspections to every 12 days
  • keyboard_arrow_right No need to stop traffic
  • keyboard_arrow_right Survey wide areas without a tripod
  • keyboard_arrow_right Subscription based service - pay per use
  • keyboard_arrow_right Systematic monitoring of large or small areas
  • keyboard_arrow_right Early warning insight for repair decision making
  • keyboard_arrow_right High accuracy measurement comparable to geodetics
  • keyboard_arrow_right Like weather forecasting for the ground beneath your feet
  • keyboard_arrow_right Applicable to all stages of construction - planning, construction, operation
  • keyboard_arrow_right Correlate locomotive and carriage movement statistics data with deformation
  • keyboard_arrow_right Measurement data analyzed to assess structural health and technical condition
How does it work?

The technology

Output of the application

Satellite line-of-sight

Basic displacement information provided by the service is the satellite line-of-sight (LOS), with projected to ground geometry and quality measures per measurement point, in radar geometry.

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The Data

Sentinel 1

Sentinel-1 routinely collects data in three modes: Interferometric Wide Swath (IW), Extra Wide Swath (EW) and Wave (WV). The latter two are used for marine applications, while the first is used over land.

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Methodology

SAR

The main source of information for deriving ground motion data are Synthetic Aperture Radar (SAR) data from the ESA Copernicus Sentinel-1 mission.

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History

About InSAR

Synthetic Aperture Radar Interferometry (InSAR) is the main technology for space based ground motion measurement. It has been in use for more than 25 years.

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Application

Data Delivery

This service offers analyzed data in powerful yet simple to operate visual mapping application. SILLE enables data analytics, comparison, reporting and visualizing. Data can be also integrated seamlessly in the existing railroad management system.

The Technology

Output of the Application

Basic displacement information provided by the service is the satellite line-of-sight (LOS), with projected to ground geometry and quality measures per measurement point, in radar geometry.

East-West and Up-Down deformation rates produced by combining data stemming from ascending and descending orbits. Basic displacement information data should be seen as an intermediate product, necessary in order to produce East-West and Up- Down deformation rates.

These two LOS vector components from basic displacement can be used to calculate the east-west and vertical components of movement.

East-West and Up-Down deformation products are useful for general engineers who will find them easier to interpret than LOS measurements. They will also be very useful for highlighting horizontal deformation.

The Technology

Data

Sentinel-1 routinely collects data in three modes: Interferometric Wide Swath (IW), Extra Wide Swath (EW) and Wave (WV). The latter two are used for marine applications, while the first is used over land.

IW mode is designed to be used for Interferometric Synthetic Aperture Radar (InSAR), a technique that allows the measurement of relative motion of the surface. Such motion includes movement of natural terrain as well as buildings and other infrastructure (railway) on the Earth’s surface. The InSAR processing of time series in the service will be based on using the Sentinel-1 IW mode Single Look Complex products at 5x20 (approx.) meter resolution.

Digital elevation model (DEM) data and weather information are also integrated in the system to offer accurate results.

The Technology

Methodology

The main source of information for deriving ground motion data are Synthetic Aperture Radar (SAR) data from the ESA Copernicus Sentinel-1 mission.

This mission provides full coverage of USA from at least one (many areas from two different) observation geometries (ascending or descending) every 12 days.

From these data, ground motion can be derived using InSAR time series analyses. There are many different InSAR processing concepts, and common to all is an end product consisting of a set of ground motion time series valid for specific points or pixels, with a corresponding quality measure. SILLE uses cutting edge technology and scientific findings integrated to the system.

Among our partners are the key scientists in the world of Interferometric Synthetic Aperture Radar Persistent Scatterer InSAR science.

InSAR is a technique that determines the component of movement along a vector parallel to the satellite-to-ground line of sight (LOS) vector, relative to a chosen reference point.

Each point on Europe’s surface is imaged regularly from both ascending (north going) and descending (south going) orbits. Since the Sentinel-1 satellites are side looking, the result is that the velocity of each point can be measured along two different lines of sight, one looking east and one looking west.

The Technology

History

Synthetic Aperture Radar Interferometry (InSAR) is the main technology for space based ground motion measurement. It has been in use for more than 25 years. Early applications and demonstrations using pairs of images showed the significant displacement caused by earthquakes.

In the late 1990s, a new suite of multi-image InSAR techniques were developed that revealed movements of millimeters per year. The application of these techniques was made possible by the unique archive of radar images acquired by the ERS-1 and -2 satellites beginning in 1992. These satellites acquired images in a consistent geometry as often as every 35 days.

Other civilian SAR satellites followed, including Radarsat-1 and -2, and ENVISAT, as well as a number of high-resolution commercial SAR systems.

Building on the success of many InSAR demonstration studies, a number of initiatives emerged to streamline the efforts. In particular the TerraFirma project (2003-2014), PanGeo (2011-1014); the Italian Piano Straodinario di telerilevamento Ambientale (2008-2016); as well as a number of spin-off projects building on top of TerraFirma and PanGeo, including SubCoast, EVOSS, and Lampre.

The common denominator in all these initiatives was to streamline independent activities into a unified prototype service, albeit with different target audiences. The focus was both on algorithmic and operational developments, as well as validation activities.

Nevertheless, many of these initiatives were faced with a major operation limitation due to lack of systematic source of radar images and hampered by inherent restrictions of the satellite acquisition modes.

The result was that it required several years of image acquisitions in order to obtain reliable InSAR results. This meant that the data was usually only processed one time and not regularly updated.

Now, thanks to the Copernicus programme, all the right ingredients are available for introducing and operating a radar-based service, including a free and open data policy, the long-term, predictable operations of the Sentinel-1 mission, high performance computational environments and the algorithmic know-how.

The Sentinel-1 satellites provide a unique new opportunity to provide dynamically updated ground motion datasets. It is possible to monitor hazardous processes and see the effects of remediation efforts.

Contact Us

We’d love to hear from you!

Christiana Marjakangas

Christiana Marjakangas

Client Contact

Anu Riisikamp

Anu Riisikamp

Client Contact for Estonian market

Carl Pucci

Carl Pucci

Head of International Operations

Andreas Kiik

Andreas Kiik

Space Program Manager

About Us

Datel AS & Ovela LLC

The Partner for fast building e-society

Datel AS is one of the oldest and biggest Estonian-owned IT enterprises. It currently employs around 100 people. During its 26 years of operations, Datel has made life easier and simpler for many Estonians by creating numerous Estonian e-state services. In 2013, Datel established a subsidiary in the USA. In 2016, Datel and its subsidiary Ovela LLC created a software solution for the White House initiative ‘Opportunity Project’, which enables local authorities in the USA to develop local life.

Empowering smart communities

Active on three continents, the Datel Group empowers smart communities from the United States to Asia. Implementing brilliant ideas from the very narrow to those of an entire nation, find your story with us.

Datel AS
Ovela LLC
  • timeline Founded: 1990
  • people Employees/Staff: 90+
  • language Web: www.datel.eu
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