ࡱ> 796[ ?bjbj 0jj?l ,Q88888888$# C88888888 88888888888, @$H 8!0Q88Bounding Box and Bounding Polygon The relevant part of ISO 19115 is section A.3.1 [Extent information]. Within the abstract there is the element EX_GeographicExtent that is the generalized superclass of the following subclasses: EX_BoundingPolygon (short name: BoundPoly) EX_GeographicBoundingBox (short name: GeoBndBox) EX_GeographicDescription (short name: GeoDesc) DDI currently contains the element geogCover, that maps well to GeoDesc. By adding BOTH BoundPoly and GeoBndBox to the DDI, we will include all the major elements of EX_GeographicExtent. The proposed structure for both the bounding box and the bounding polygon elements reflects the ISO structure rather than the GML (Geographic Markup Language) previously proposed for the bounding box element. The contents are essentially the same, but the parts are more descretely defined in the ISO structure. PROPOSAL: Add the following elements under sumDscr (2.2.3) between geogUnit (2.2.3.5) and anlyUnit (2.2.3.6). Additional Notes on the Bounding Polygon: The polygon element has been limited to using longitude and latitude to designate the points that define it. This could later be expanded with a more generic set of coordinates with an attribute to signify coordinate type. The current proposed structure reflects the FGDC approach. The BoundPoly allows you to create one or more polygons to describe the geographic area covered by the data in a more detailed manner. This field should not be used to describe interior boundaries (for example, individual States within the geogCover of United States). It allows for muliple polygons so that you could, in the United States example above, create a boundary for the contiguous United States, one for Alaska and one for Hawaii. These polygons can be as simple as a triangle or very complex. In determining the level of detail it is important to remember that this is being used for further refining of a coordinate based search, not to actually map the area. In addtion, all points enclosed by BoundPoly MUST be contained within the GeoBndBox (defined as its boarders and all interior points). For ease of creating the GeoBndBox from the information in the BoundPoly, the northern- and southern-most latitude, and the eastern- and western-most longitudes, should be each be represented in at least one point of the BoundPoly description. These can then be used to create the westBL, eastBL, southBL and northBL of the GeoBndBox. Scheme Layout | | | |-- 2.2.3.5 geogUnit* (ATT == ID, xml:lang, source) | | | |-- 2.2.3.6 GeoBndBox? (ATT == ID, xml:lang, source) | | | | | | | | | |-- 2.2.3.6.1 westBL (ATT == ID, xml:lang, source) | | | | |-- 2.2.3.6.2 eastBL (ATT == ID, xml:lang, source) | | | | |-- 2.2.3.6.3 southBL (ATT == ID, xml:lang, source) | | | | +-- 2.2.3.6.4 northBL (ATT == ID, xml:lang, source) | | | | | | | |-- 2.2.3.7 BoundPoly? (ATT == ID, xml:lang, source) | | | | | | | | | +-- 2.2.3.7.1 polygon+ (ATT == ID, xml:lang, source) | | | | | | | | | +-- 2.2.3.7.1.1 point+ (ATT == ID, xml:lang, source) | | | | | | | | | |-- 2.2.3.7.1.1 gringLat (ATT == ID, xml:lang, source) | | | | +-- 2.2.3.7.1.2 gringLon (ATT == ID, xml:lang, source) | | | | | | | |-- 2.2.3.8 anlyUnit* (ATT == ID, xml:lang, source, unit) " ] h n it{."'=$/7LMw>?5CJPJOJQJCJ5CJ /"#Gxy45noyz`+ i ) k  ? 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