AN EFFICIENT MODULARIZED DATABASE STRUCTURE FOR A HIGH-RESOLUTION COLUMN-GRIDDED MARS GLOBAL TERRAIN DATABASE

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dc.contributor.authorBradley, Jameseng
dc.date.accessioned2008-02-27T23:01:25Z
dc.date.available2008-02-27T23:01:25Z
dc.date.computerscience1999-05-27eng
dc.date.issued1997-12-01eng
dc.description.abstractThis paper discusses a modularized design for a Mars Global Terrain Database. The design provides for elevation data with respect to a triaxial ellipsoidal reference datum developed for Mars by USGS. Terrain data is recorded for 1-second of arc grid elements over the surface of Mars. A 400 Gigabyte column-gridded relation called Terrain contains the surface terrain data. Data for Terrain is expected in 1999-2000 from the Mars Global Surveyor satellite currently in initial polar orbit around Mars. Each tuple of Terrain contains data for a N-S column-grid of 900 1-second grid elements. There is thus a set of tuples per 1-degree rectangle, with the number of tuples per set decreasing with the cosine of latitude. Surface resolution is a uniform 16.5 meters everywhere with a 1-second grid. The design constrains tuple sizes in Terrain to permit efficient blocking and manipulation of the records of the underlying storage file. Terrain contains a virtual-attribute function for geodetic computations relating to the triaxial ellipsoidal reference datum. The database also relates Mars feature-type relations to Terrain. Terrain's gridded structure is transparent to users writing SQL expressions to retrieve Terrain data on the basis of specific features. Many different distinct feature-type relations can be included. At least two of these are participate in recursive relationships. The design also allows attachment of additional feature-type relations in a modular manner, correctly related to Terrain, without affecting the contents of Terrain.eng
dc.description.notesWe are currently acquiring citations for the work deposited into this collection. We recognize the distribution rights of this item may have been assigned to another entity, other than the author(s) of the work.If you can provide the citation for this work or you think you own the distribution rights to this work please contact the Institutional Repository Administrator at digitize@ucalgary.caeng
dc.identifier.department1997-608-10eng
dc.identifier.doihttp://dx.doi.org/10.11575/PRISM/30414
dc.identifier.urihttp://hdl.handle.net/1880/46321
dc.language.isoEngeng
dc.publisher.corporateUniversity of Calgaryeng
dc.publisher.facultyScienceeng
dc.subjectComputer Scienceeng
dc.titleAN EFFICIENT MODULARIZED DATABASE STRUCTURE FOR A HIGH-RESOLUTION COLUMN-GRIDDED MARS GLOBAL TERRAIN DATABASEeng
dc.typeunknown
thesis.degree.disciplineComputer Scienceeng
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