NOAA Office of Coast Survey released its 1:12,000 electronic navigational chart (NOAA ENC®) of the Merrimack River, Massachusetts, in the RNC Tile Service. This is the first time a navigational chart—created solely as ENC product—is included in the tile service. The tile service renders a traditional depiction of the nautical chart for use with GPS-enabled electronic chart systems or other “chart plotter” display systems to provide real-time vessel positioning for recreational mariners. This chart is included in the single chart tile sets and the quilted tile sets both in the online and offline versions.
The tile service version of the Merrimack chart retains the look of a NOAA paper chart but is derived from the ENC charting database. This gives users the opportunity to use ENC-only data with a traditional NOAA chart feel. NOAA intends to incorporate all future charts that are produced only as ENCs into the tile service (ENC-only charts are outlined in the National Charting Plan, page 25).
“This release represents a major milestone in nautical charting,” said Rear Admiral Shepard Smith, the director of Coast Survey. “This is the first chart that was digital from its inception, breaking with the longstanding practice of digital charts based on paper charts.”
For professional mariners, it is important to note that there is no paper chart equivalent, and that this chart will not be served by the Notice to Mariners systems provided by the U.S. Coast Guard and National Geospatial-Intelligence Agency. Updates will be made as necessary by NOAA weekly. Customers with compatible applications will get the updates automatically.
The original 1:12,000 ENC of the Merrimack River was released at this time last year. Recognizing the need for a more detailed chart, a group of local and state stakeholders concerned with the economic revitalization of the area contacted NOAA to create a new, larger-scale chart. The new, larger-scale ENC was compiled using U.S. Army Corps of Engineers data, NOAA lidar data, and privately funded survey data. When shown in detail, the combined data provides mariners with a clearer picture of the overall conditions and dangers to navigation. The availability of this chart in the RNC tile service provides mariners greater flexibility in viewing the chart.
This update to the RNC tile service also includes the ArcGIS Tile Metadata Service, adding support for source chart metadata from within ArcMap and other GIS applications. Instructions for loading the tile metadata into ArcMap have been added to the developer’s website.
The ArcGIS Tile Metadata Service can be accessed from a web application, as shown below in our ArcGIS sample viewer for the quilted tile set.