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Reference : UMR5275-FABCAR-046
Workplace : GRENOBLE
Date of publication : Friday, April 30, 2021
Type of Contract : FTC Technical / Administrative
Contract Period : 6 months
Expected date of employment : 1 June 2021
Proportion of work : Part time
Remuneration : Gross salary from 1705,9 to 1831,2 euros according to the experience
Desired level of education : Engineer
Experience required : 1 to 4 years
Satellite radar interferometry (InSAR) is a spatial imaging technique that will have the potential to monitor in time and space all deformations of the ground surface with mm/year accuracy.
The conditions for producing sufficiently dense and systematic time series to meet the needs of the study of the seismic cycle are now met thanks to the 6 years of acquisitions since the launch of the radar imaging mission of the SENTINEL1 satellites, within the framework of the very ambitious European program COPERNICUS "Observing the earth". The images are provided free of charge and acquired systematically over the entire globe since 2015 (and at least until 2030) with a pass every 6 days.
But such an advance implies a considerable growth in the volume of data processed by the processing chains. The ISTerre team is developing one of the reference processing chains in the field: NSBAS. This processing chain is the subject of two implementations in the form of services in which OSUG is involved:
- FLATSIM (ForM@Ter LArge-scale multi-Temporal Sentinel-1 Interferometry processing chain in Muscate), a service for the massive and systematic production of INSAR time series over large regions, accessible by a call for projects to the French community. This service is proposed in the framework of ForM@Ter, the Solid Earth pole of the national research infrastructure Data Terra.
- GDM-SAR (Ground Deformation Monitoring with SAR), an on-demand INSAR processing service, proposed in the framework of the European Research Infrastructure EPOS, led by ForM@Ter. In this service the computation part will be hosted at CNES, the graphical interface part, web-service at IPGP and the data storage part at OSUG.
The job offer is for an 70% position: the work required (follow-up of the GDM-SAR project) requires interactions with several teams at ISTerre and CNES, which can only be done over time. The engineer recruited will have the following missions:
- Participation in the GDM SAR implementation (adaptation of the NSBAS chain, maintenance of the version used, quality inspection of the intermediate and final products). Support tp beta-users of the service and feedbacks analysis.
- Analysis of FLATSIM products and reprocessing of time series at sites in France defined by the team in order to improve and validate the final velocity fields. These time series will use the interferograms obtained from the FLATSIM processing. Moreover, the pre-processing of Sentinel-1 data in France by the FLATSIM project will be progressive from July 2021, so the engineer will have to process the new data as they are received.
- Support to CNES engineers for the development of the GDM-SAR service.
- Maintenance of the quality control on Gitlab-CI:
- NSBAS chain code hosted on a Gitlab software forge. The engineer will be responsible for maintaining the quality control procedure via Gitlab-CI.
- Implementation of new quality control tests. The engineer will be in charge of integrating the quality control tests carried out informally during software releases into the quality control procedure.
- radar interferometry processing experience with NSBAS chain;
- software development: knowledge in python, bash;
- experience deploying code on compute cluster;
- software engineering: knowledge of Git/gitlab;
- knowledge of unix/linux environment;
- English skills, both written and oral;
- ability to work in a team environment.
Skill not required but would be a plus:
- knowledge of Perl, C, Fortran
ISTerre is a Joint Research Unit of Grenoble Alpes University, CNRS, USMB, IRD and Gustave Eiffel University, located 1381 rue de la Piscine 38400 Saint-Martin d'Hères and on the Scientific Campus of Le Bourget du Lac. It is part of the Observatoire des Sciences de l'Univers de Grenoble (OSUG) and of the PAGE Research Pole of the University Grenoble Alpes (UGA). It employs around 300 people for an average annual budget of 7 M€. It is organized around 9 research and service teams, the scientific objective being the physical and chemical study of planet Earth, with a particular focus on coupling between observations of natural objects, experimentation and modeling of the associated complex processes. ISTerre also carries out solid Earth observation missions, hosts and maintains national geophysical instrument parks and a data centre.
The engineer will have at his disposal a standard workstation for software development. He/she will also have access to HPC computing resources (GRICAD meso-center) and to a software forge (Gitlab). Short-term missions may be envisaged within the framework of collaborations with national or European projects. The engineer will be integrated in the "Seismic cycle and transient deformations" team, to which are attached researchers expert in radar interferometry, and who are part of the scientific team of GDM-SAR and FlatSIM.
The engineer will work in close collaboration with ISTerre researchers and engineers involved in the development of the NSBAS chain. He/she will be integrated into the Geodata service (which federates ISTerre's computer engineers) in connection with the OSUG.
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