[Requests] Proposed Correction to Document 15-113 - Volume 1: OGC CDB Core Standard Model and Physical Data Store Structure

Bernard Leclerc bernard.leclerc at cae.com
Wed May 4 23:29:51 EDT 2016


PART A


1.       Evaluator: Bernard Leclerc, Senior Technical Specialist, CAE, Montreal, Canada

2.       Submission: Document 15-113 - Volume 1: OGC CDB Core Standard Model and Physical Data Store Structure


PART B


1.       Requirement: Subordinate Bathymetry Component

2.       Implementation Specification Section number: Section 5.6.1.8

3.       Criticality: Major

4.       Comments/justifications for changes: As formulated today, the description of the Bathymetry component suggest that it is possible to determine precisely the location of the shoreline of water bodies because of the presence of positive and negative values; the shoreline being defined as the  isoline where B - the value of the bathymetry component - is zero. It turns out that it is not possible to provide negative values of (depth) bathymetry as explained in the annotated document that is attached.

In short, the bathymetry component is defined as a grid providing the depth of water when the grid element is submerged. As such, only positive values makes sense; as other values indicate that the grid element is NOT submerged. This fact is reinforced by Equation 5-3 where only the positive bathymetry values are used to determine the elevation of the Earth's crust.

Note that correction to Figures 5-20 and 5-22 will also be required to match the corrected text.

As a side note, I'd like to mention that this error has been reported by our developers trying to support and implement the bathymetry component of the CDB Specification into their applications. At that moment, they noticed the ambiguity of the text where a negative bathymetry value is defined relative to a "nearby" water body. The problem arise when you have two or more "nearby" water bodies of different water level.





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Bernard Leclerc, ing./eng.
Spécialiste technique sénior, Ingénierie mondiale du développement
Senior Technical Specialist, Global Development Engineering
T. +1-514-341-2000, 2062   E. bernard.leclerc at cae.com
8585 Cote-de-Liesse, Saint-Laurent, Quebec, Canada, H4T 1G6
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