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  • Canadian tides and water level station information, benchmarks, observed water level data, and tidal predictions. The Canadian tide and water level data archive presently holds water level observations reported from over a thousand stations, with the earliest dating back to 1848. The number of observations spans on average 6 years per station, with 60 stations measuring water levels for over 50 years. Over 800 stations are subjected to appreciable effect of tides, and for most of these stations, the Canadian Hydrographic Service (CHS) calculates and publishes predictions of the water levels associated with the vertical movement of the tide. Observations from the CHS Permanent Water Level Network are added on a daily to monthly basis. Data are also exchanged annually with the Water Survey of Canada. Each point in the map represents a station with links to observations, tidal predictions, and benchmark information, where available.

  • CHS offers 500-metre bathymetric gridded data for users interested in the topography of the seafloor. This data provides seafloor depth in metres and is accessible for download as predefined areas.

  • Displays the geographical extent of products produced by the Canadian Hydrographic Service, including: individual paper charts, vector Electronic Navigational Charts (ENC), and digital raster charts collections (BSB).

  • Displays the geographical extent of products produced by the Canadian Hydrographic Service, including: individual paper charts, vector Electronic Navigational Charts (ENC), and digital raster charts collections (BSB).

  • To directly access the CHS NONNA Data Portal please follow this link - https://data.chs-shc.ca/login (*Note* - The portal is NOT compatible with Internet Explorer browser). New users of the CHS NONNA Data Portal are encouraged to fully review the 'CHS NONNA Data Portal Guidance Document' (PDF) which is available below in the RESOURCES section of this page. ----- PRODUCT USE ----- The Canadian Hydrographic Service (CHS) NONNA Bathymetric Data products are for NON-NAVIGATIONAL USE ONLY. Under the Charts and Nautical Publications Regulations, 1995, made pursuant to the Canada Shipping Act (2001), notwithstanding exceptions, vessels navigating in Canadian waters must carry and use nautical charts and related publications issued by, or on the authority of the CHS. To obtain official navigational products released by the CHS, please see: www.charts.gc.ca For bathymetry outside of Canada’s jurisdiction, please consult the appropriate Hydrographic Office. ----- PRODUCT DESCRIPTION ----- The CHS NONNA-10 and NONNA-100 Bathymetric Data products represent a consolidation of digital bathymetric sources managed by the CHS. The « NONNA » refers to NON-NAvigational. The « 10 » or « 100 » references the approximate resolution (in metres) of the data. The CHS NONNA-10 individual product coverage is as follows: • South of 68°N the products = 0.1° latitude X 0.1° longitude (0.0001 degrees) • 68°N-80°N the products = 0.1° latitude X 0.2° longitude (0.0002 degrees) • 80°N and north the products = 0.1° latitude X 0.4° longitude (0.0004 degrees) The CHS NONNA-100 individual product coverage is as follows: • South of 68°N the products = 1° latitude X 1° longitude (0.001 degrees) • 68°N-80°N the products = 1° latitude X 2° longitude (0.002 degrees) • 80°N and north the products = 1° latitude X 4° longitude (0.004 degrees) There are various valid vertical datums associated with CHS' bathymetric sources. As a result, the vertical reference of the CHS NONNA products does not conform to a unified vertical datum. There may be data visible on land. These are elevations that were acquired during airborne bathymetric LiDAR (Light Detection And Ranging) surveys. Elevation values will appear as a positive number when querying the data in the CHS NONNA Data Portal. Please note that gaps in the data may be visible where modern surveys have not yet been conducted or where legacy data has not yet been digitized. Data sources included in the NONNA products may not have been subjected to the same level of quality assurance as those in official navigational products. The CHS NONNA products will be updated annually and made available by the last Friday of April of each calendar year. ----- PRODUCT FORMATS ----- CHS NONNA products adhere to the following naming convention: NONNA10_4360N07940W • NONNA10 = the product and will be either NONNA100 or NONNA10 • 4360N07940W = the south-west corner of the NONNA cell. These products are available to view, query and download via the CHS NONNA Data Portal. The following formats are available for download: • 32-bit GeoTIFF • ASCII++ (XYZ) • CSAR • BAG These formats can be opened using various GIS applications. Alternatively, the CHS NONNA products can be accessed via Web Map Service (WMS) or Web Coverage Service (WCS) links.

  • CHS offers 500-metre bathymetric gridded data for users interested in the topography of the seafloor. This data provides seafloor depth in metres and is accessible for download as predefined areas.

  • This service provides routeing measures. These include established (mandatory) direction of traffic flow, recommended direction of traffic flow, separation lines, separation zones, limits of restricted routeing measure, limits of routeing measures, precautionary areas, archipelagic sea lanes (axis line and limit beyond which vessels shall not navigate) and fairways designated by regulatory authority.

  • Geographic bathymetric grid data at 100 m x 100 m pixel resolution. Datum: WGS84 Collaboration of Canada, the United States of America and the European Union as part of the Atlantic Ocean Research Alliance's second project under the Galway Statement. Project mapped the North Atlantic seafloor along a transect from Halifax, Canada to Tromsø, Norway to further the understanding of marine habitats, conservation and navigation. Chief Scientist / Primary Investigator name: Paola Travaglini Platform: CCGS Louis S. St- Laurent (Canadian heavy icebreaker) Device 1 type: Multibeam echo-sounder (sonar) Device 1 manufacturer: Kongsberg Device 1 model: EM122, hull installed behind ice protection window https://www.km.kongsberg.com/ks/web/nokbg0397.nsf/AllWeb/E016DF00EBFC2964C12571B1003F9DDA/$file/306105_em122_product_specification.pdf Data and Data format: 100 m resolution grid of bathymetry BAG format: Bathymetric Attributed Grid Object https://www.ngdc.noaa.gov/mgg/bathymetry/noshdb/ons_fsd.pdf Navigation and positioning: Trimble GNSS receiver + antennas Applanix POS/MV v5 inertial measuring system Horizontal Datum: WGS84 (G1762) Tidal correction: Zero tide applied: tides are not well known for the major part of the data and tides over very deep water are generally negligible. Sound Velocity Profile measurements: In-situ sound velocity profiles were applied. Note on accuracy/S-44 survey standards: Considering the intended output from this survey (IHO Order 1a - Areas shallower than 100 metres where under-keel clearance is less critical but features of concern to surface shipping may exist.) and using an average depth of 2000m as ‘d’ in the IHO Standard Equation - the allowable Total Vertical Uncertainty (TVU) must be < 26m which indeed the data has achieved (by comparison with overlapping datasets from other surveys/agency data). IHO Order 1a Horizontal positioning accuracy: 5.0 m + 5% of depth (95% Confidence level)(~105 m at a mean depth of 2000 m) Vertical positioning accuracy: 2.5 m < 26 m = Sqrt((0.5 m)^2+(0.013 x 2000 m)^2)

  • Map of Canada showing locations of facilities selling nautical charts in both paper and digital formats.

  • The MSDI Surface Current Web Service is a dynamic national dataset offering full coverage of surface current visualization in Canadian waters. The service has been developed and managed by the Canadian Hydrographic Service in collaboration with Environment and Climate Change Canada. As with all MSDI products, this service is strictly NOT FOR NAVIGATION. This data is best viewed by software that supports time-aware map services.