ADDITIONAL MILITARY LAYERS - United Kingdom Hydrographic ...

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Additional Military Layers Environment, Seabed and Beach Product Specification 2.4 LAYER ORGANISATION The content of the product is not layered. However, specific exchange standards may impose their own internal layering requirements. 2.5 EXCHANGE STANDARD IMPLEMENTATION This product specification has been written to be independent of the exchange standard used. Details of exchange standard implementations are given in the relevant annex. 2.5.1 Spatial Data Type AML ESB contains spatial objects as vector data. 2.5.2 Level of Topology The topological level of the product may be influenced by the exchange standard and so this is defined in the relevant annex. 2.5.3 Relationship with Layering N/A 2.5.4 Textual Information Attributes that contain free text must not be used when it is possible to encode the information by means of any other attribute. 2.5.5 Reference to External Files Text and picture files may also be included in the AML product to provide additional information. ANNEX A A.1.1.5.1.2 and A.1.1.7.4 Below are examples of potential formats. · ASCII · TIFF · PDF · HTML · JPEG · AVI · MPEG 2.6 SIZING REQUIREMENTS This will be dependent upon the exchange standard implementation being used. 2.7 GENERAL SOURCE DESCRIPTION 2.7.1 Minimum Source Requirements Sources for any real -world feature detailed in section 5.5.2 meet the following requirements · the data capture point -density fulfils the data capture requirements specified in section 2.2 · mandatory features specified in section 5.5.2.1 are included · the mandatory attribution levels for each object, specified in section 5.5.2, are met 2.7.2 Applicable Sources All sources used must meet the minimum requirements. Wherever available, sources that provide exact definitions of entities eg. geographical co -ordinates, should be used in preference to digitising from graphical representations. Page 18 Version 1.0
Additional Military Layers Environment, Seabed and Beach Product Specification 3 GENERAL DATA DESCRIPTION 3.1 DATUMS Please refer to NATO STANAG 2211 - Geodetic Datums, Ellipsoids, Grids & Grid References, which establishes the NATO guidelines to the use of horizontal and vertical datums. 3.1.1 Horizontal Datum The horizontal datum for the AML HRE is the World Geodetic System 1984 (WGS 84). ANNEX A 3.1.2 Vertical Datums A.1.2.7.1.3 3.1.2.1 Height Datum The default height datum for the AML HRE is specified in the metadata of the dataset. ANNEX A A.1.2.7.1.3 The default height datum can be varied by the use of lower level metadata or feature level attribution. ANNEX A A.2.3.2 3.1.2.2 Sounding Datum The default sounding datum for AML HRE is specified in the metadata of the dataset. ANNEX A A.1.2.7.1.3 The default sounding datum can be varied by the use of lower level metadata or feature level attribution. ANNEX A A.2.3.2 3.2 UNITS The default units to be used in AML HRE are: · Position: latitude and longitude in decimal degrees · Depth: metres · Height: metres · Length/width: metres · Positional accuracy: metres · Distance: nautical miles or metres The default units can be varied by the use of lower level metadata or feature level attribution. 3.2.1 Time AML may contain attributes used to encode time e.g. the beginning and end of an active period for an object. When using these attributes all times should be encoded as Page 19 Version 1.0
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