COPERNICUS MARINE - PRODUCTION - FOURNITURE DE LA BATHYMETRIE CÔTIERE GLOBALE DERIVEE DES OBSERVATIONS DE SENTINEL 2

• Dear Sir/Madam,
  Based on our experience in recent years, it is difficult to organize a consortium, prepare all documentation for the tender and get all the needed admin support and formal internal approval across July and August, particularly for public agencies like XXXXXX.
  We thus ask to postpone the deadline I towards the end of September, or at least of a couple of weeks.
  
  Best Regards.

  24 juillet 2023 10:20 (heure de Paris)

  • Réponse:
    Bonjour, Nous ne pouvons malheureusement pas accéder à votre demande. Le planning étant fixé avec certaines dates impératives, nous ne pouvons pas déplacer la date limite de remise des offres. // Unfortunately, we cannot accommodate your request. As the schedule is fixed with certain imperative dates, we cannot move the deadline for submitting offers. Best regards,

    26 juillet 2023 10:46 (heure de Paris)

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• Dears,
  Among the 5 refence documents listed in p.4 of the SOW, you have included the IHO S-44 (standard for hydrographic surveys) which does not refer explicitly to bathymetry measurements from data collected by sensors on-board satellites (satellite derived bathymetry, i.e. SDB), whereas IHO has recently published a document called ?Satellite-Derived Bathymetry Best Practice Guide? (B-13 ed.1.0.0, April 2023). Despite referring to the previous edition of the IHO S-44 (v. 6.0.0), this new document seems in-line with the new edition (v.6.1.0), and it may provide guidance in relation to [REQ-SDB-3], [REQ-SDB-5], [REQ-SDB-9], and [REQ-SDB-31 & 32] of the SOW:
  Q1: does Mercator Ocean consider the IHO B-13 document as a standard ? (cf. [REQ-SDB-34]
  Many thanks.

  10 juillet 2023 19:02 (heure de Paris)

  • Réponse:
    The "Satellite-Derived Bathymetry Best Practice Guide" draft document (IHO, B-13 ed.1.0.0, April 2023) produced by IHO seeks to inform the SDB data users and to understand the principles and underlying assumptions, limitations and impacts on the usage of SDB data.
    We recommend all bidders to read this document and consider it as a guidance document for their technical proposal.

    21 juillet 2023 15:36 (heure de Paris)

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• Further to the approval by the EC of the development of a coastal extension of the Copernicus Marine service, Mercator Ocean has published a call for the supply of SDB data (Satellite-Derived Bathymetry) which is called ?nearshore bathymetry products? by the SOW. As per the aforesaid SOW the contractor would provide ?a L4 static global SDB product?, the spatial coverage being defined in REQ-SDB-4: ?The SDB product shall cover coastal areas of the global ocean, covering ocean depth down to several tens of meters?. We understand that it is up to the bidder to indicate the depth range to be covered, but, whatever the depth of water light penetration allowing the satellite sensor to sense the seafloor, or the depth by which any change in the bathymetry would create a change in the wave field structure, all the coastal areas have to be explored to find out whether there is a piece of seafloor which is lower than that depth. The length of the coastline depends on the mapping scale: for an average accuracy-resolution of 75 m (in line with REQ-SDB-5 which requires 50-100m), the scale is 1:250,000 as per hydrographic standards; the related shoreline length is 1,634,700 km for the world. If coastal areas were equivalent to territorial waters, i.e. area where sovereign nations have state jurisdiction (width of 12 miles from the baseline that represent the shorelines according to the International Law of the Sea), the number of square km to be explored is some 36 million. Could you confirm it is the area that should be explored to retrieve SDB?
  Nota: it is obvious that on most of the area the contractor won?t be able to retrieve SDB as the average depth is some 20m and some of the waters do have the needed optical clarity; however one can get shallow waters extending far away from the coast (e.g. the Bahamas, where the ratio of shallow water surfaces to the length of the coastline is 40, instead of the world average 20).

  7 juillet 2023 17:22 (heure de Paris)

  • Réponse:
    We confirm that the call asks for an SDB product that covers coastal areas of the global ocean, i.e., from the shoreline and extending offshore as deep as possible, potentially down to several tens of meters. It is up to the bidder to define the attainable depth range to be covered and the associated product uncertainties. We understand that the depth range of the SDB (and covered coastal area) will be spatially variable, depending on coastal typologies and characteristics.

    21 juillet 2023 15:36 (heure de Paris)

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• Dears,
  
  please find here attached a file containing a question.
  
  Many thanks in advance

  10 juillet 2023 19:06 (heure de Paris)

  (DOCX, 16 Ko) Fichier joint à la question : Télécharger

  • Réponse:
    1- No, it does not need to be valid for navigation purposes as per an IHO standard level ;
    2- No, the purpose of the SDB to be delivered through this call is not to be valid for delineation of the coast or drawing coast baselines and sea borders ;
    3- Yes, we confirm that as a core EU service, Copernicus Marine is targeting an SDB product with a medium resolution of 50-100m ;
    4- When referring to mean effective resolution, this means the resolution of the L4 product ;
    5- Firstly, in Cesbron et al. (2021), the bathymetry "orders" mentioned in Table 2 and matrix specifications in Table 3 are those from the IHO standards S-44, not suggested by Cesbron et al. themselves.
    Secondly, the bidders are asked to define uncertainties of the data in terms of vertical and horizontal depth assessment accuracy and feature detection as mentioned in the [REQ-SDB-9] of the SOW ;
    6- The aim of the call is to provide an open access static (with a potential extension to dynamic) coastal SDB dataset at (a consistent) medium resolution for the global coasts using Sentinel 2 (or other similar satellite input). The objective of GEBCO is to provide static gridded bathymetric data from various sources, techniques and at various resolutions. The purpose of seabed 2030 (a joint venture between the Nippon Foundation and GEBCO) is to improve the data collection of bathymetric data at a sufficient resolution to produce a definite static map of the world ocean floor by 2030. These three activities are complementary.

    21 juillet 2023 15:36 (heure de Paris)

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