NOAA Accepts ESRI-Based System To Modernize Nautical Chart Production
Q. What is OceanGrafix's relationship with NOAA? A: A new “Edition” brings a NOAA nautical chart up to date for all chartable information available to NOAA. Tara Wallace, Marine Chart Division, OCS, NOS, NOAA. Abstract goal elements, their present status, and the relationship between the US Coast Guard's highly accurate ENCs, and end with the resulting benefits to the mariner and other. tions, and views the relationship of the ship to the surrounding Should a marine accident occur, the nautical chart in use at the NGA charts do not contain a “ cleared through” date like NOAA charts .. end. Piles, dolphins (clusters of piles), snags, and stumps are shown by small circles and a label identifying the type.
It is the approach most commonly used for the purpose of cartographic data exchange. There is great interest in S in the international maritime com- munity; however, to date, most S data sets have been developed only as proto- types.
High-volume data production of S data has not yet occurred, although at least one large S data set of the St. Lawrence Seaway has been prepared by the Canadian Hydrographic Service.
NOAA nautical charts now available as free PDFs
Although S will no doubt undergo some future modifications as do all international standardsS is currently the most widely adopted spatial data transfer standard in the hydrographic community and the only spatial data standard adopted by the International Hydrographic Organi- zation.
Department of Defense DOD customer demands for fully digitized products. VPF is a standard framework that allows products to be specified within it. DMA's published goal is to provide 70 percent of its products in fully digitized form over the next five years and to provide these products as digitized data freely accessible subject to security constraints for browsing by customers over net- works such as Internet. VPF was developed to be a direct-use standard, not a transfer standard, and in this regard it is different from S The design goal for VPF was a machine- independent database format that would allow database products to be used di- rectly by GIS software.
As a result, VPF must provide random access to each record.
NOAA Raster Chart Products
Therefore, VPF must provide most of the services of an internal database manager in an integrated GIS software package, including descriptive schema definition tables.
Similar to data sets implemented in ISOVPF is "self-describing," in that its schema definition tables are built into the data content; these schema definition tables can be accessed by spatial and thematic indices whenever they are needed, instead of in strictly sequential order. Therefore, these schema tables can be accessed to determine the design of the database.
The schema tables also known as metadata, or data about datacan also be displayed directly to the user to support on-line data dictionary functions, legend functions, data quality de- scriptions, library reference or "inset" maps, or the presentation of other infor- mation that is normally found on the borders of printed maps.
A data standard intended for direct use must also be able to represent a wide variety of databases. VPF is based on a single general model that supports a wide variety of database designs, including integrated or layered designs and simple or complex designs. An interchange format, in contrast, must construct specific in- terchanges between each data model that it attempts to exchange.
Thus an inter- change format cannot be directly read by any single application. Because VPF relies on a single data model, it permits the development of generic software and allows the direct use of geographic data. VPF has a neutral, machine-independent format design.
VPF does not con- tain information-like feature coding schemes or special relationships between features, which may vary from one database product to another. VPF allows such information to be encoded and included, but this information is not part of VPF itself. Instead, these product-specific entities must be defined in a product specification for a given VPF product.
Defense Mapping Agency, U. Department of Defense, Philadelphia, Pa.
In DMA designed the database for this product. The database was to be capable of supporting a wide variety of spatial analysis and geographic queries, was to include maritime features significant to marine navi- gation including all of the world's coastal and shoreline areasand was to be specified in VPF. The final DNC design is thematically layered and topologically structured, supporting a variety of spatial analyses and geographic queries.
How often does the information on my chart actually change? More often than you would think!
Office of Coast Survey
Each year NOAA issues over 11, corrections to their suite of over 1, charts. What are NGA charts? Previously discontinued in the spring ofOceanGrafix now prints over of these charts for commercial and recreational boaters. The new charts were first introduced inand OceanGrafix continues to produce them today under an exclusive contract with NOAA.
You can review the Notice to Mariners at http: The list also pertains to aids to navigation, lights, bridges, cables, pipelines, wrecks, obstructions, Federal Waterways, waterway operations and dangers to navigation.
LNMs are published at http: Additionally, NOAA makes some minor changes, which make the chart more useful. About new editions are issued per year with the time between new editions ranging from six months to several years.
The status of new editions is published at http: OceanGrafix charts are printed and shipped or picked up only when an order is placed and are non-returnable. How do I know which charts I will need?
You can visit us on the web at www. How do I find a retailer in my area?
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