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Accessing Sentinel-1 Orbit files on Geohazards TEP

Several ESA Geohazards Exploitation Platform (GEP) early adopters applying for the scenario 2 ‘New EO Service Development’ are currently supported for the integration of their data processing chain on the GEP Cloud environment. 

The resulting processor integration is then made available from the GEP Portal to users (upon sign-in credentials for https://geohazards-tep.eo.esa.int/). On the Portal, authenticated users can select data over an area of interest, set processing parameters, run a processing job and share their results on the platform.

To support these processor integration activities, we have defined an application template, dedicated to the access and the processing of Sentinel-1 data from the Platform. The template, together with the installation procedure, is available on GitHub

Based on this application template, under src/main/app-resources/myapp/run, developers of new Processing applications can now retrieve from the Platform’s catalogue the Sentinel-1 products together with the Precise Orbit Ephemerides data (or POD).

From a running workflow, a function is typically getting the start/end time of the current Sentinel-1 product to be processed, and an OpenSearch query is then performing the retrieval (using the “enclosure” parameter, that provides with the file download location) of the corresponding PODs. A last step is downloading the orbital data from the enclosure reference, and storing it on the proper file system location, in order to be ingested by the SAR processing code embedded in the new application.

In average, ESA releases the Sentinel-1 POD Precise Orbit Ephemerides 20 days after the related acquisition. If you want to process Sentinel-1 products acquired in near-real time, you can also use the orbital data enclosed within the Sentinel-1 product.

To learn more about Sentinel-1 mission and products

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2D displacements over Nepal

2D displacements over Nepal using Sentinel-1 pixel correlation

The Remote Sensing Technology Institute of DLR has published measurements derived from pixel correlation providing 2D displacements following the 25 April 2015 earthquake.

Sentinel-1 data allowed to measure a negative range shift of about 0.8 meters, corresponding to a possible uplift of about 1 meter and an azimuth shift on the order of 1.8 meters.

This is an absolute measurement derived from Sentinel-1 orbital geometry without any reference point on ground.

A brief overview of the GEP

See a short presentation of the Geohazards exploitation platform

Contact the team to learn about applications available and how to perform EO processing.

Welcome to the Hydrology TEP!

The main challenge of the Hydrology Thematic Exploitation Platform (TEP) is offering an ensemble of services to the Hydrology community based mainly on the exploitation of different EO data and tools. The goal of these services is facilitating the access, exploitation, processing and visualization of different type of data (EO, in-situ, socioeconomic or meteorological data) to the end-users in the different applications related to water management such as water resource management, floods monitoring, drought monitoring or water quality monitoring.

As water touches all societal and environmental domains, from the pint of view of end-users, there is a need for integrated, open water information services offering efficient access to cross-regional, multidisciplinary water information for all types of end-users, such as governments, scientists, businesses and civil society. The needs are particularly high in the developing world which is often data sparse. By exploiting the untapped potential of new IT cloud environment, new plethora of data of Sentinels and Third Party Missions data and new SaaS customized to the hydrology community needs, water-related challenges can be better mastered by a combination of holistic understanding of the water cycle together with evidence- based governance and increased public awareness.

In this process, EO data could play in particular a much more significant role if properly included in existing and new decision support tools for water managers and policy makers.

Hydrology TEP Blog

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