Difference between revisions of "GENIE Gridspec Diagrams Boundary"

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Boundary [[GENIE:Gridspec:Diagrams:ContactRegion|contact regions]] occur where two grid [[GENIE:Gridspec:Diagrams:Tile|tiles]] meet, but do not overlap.  The boundary type below is suitable for grid tiles with logically-rectangular discretisations; it consists of an anchor point (a point common to both grid tiles), an "alignment" flag (used to indicate whether the anchor point is shared in index space by both tiles), and an orientation, which can be used to indicate how vector fields are transformed as they cross the boundary - for instance, whether latitudes on the first grid tile map to latitudes or longitudes on the second grid tile.
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Boundary [[GENIE_Gridspec_Diagrams_ContactRegion|contact regions]] occur where two grid [[GENIE_Gridspec_Diagrams_Tile|tiles]] meet, but do not overlap.  The boundary type below is suitable for grid tiles with logically-rectangular discretisations; it consists of:
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* An anchor point - a point common to both grid tiles;
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* An "alignment" flag, used to indicate whether the anchor point is shared in index space by both tiles;
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* An orientation, which can be used to indicate how vector fields are transformed as they cross the boundary - for instance, whether latitudes on the first grid tile map to latitudes or longitudes on the second grid tile;
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* A refinement, which describes whether grid lines (cell edges) are continuous between tiles, just continuous for the coarser tile, or coprime.
  
 
[[Image:boundary_type.png|center]]
 
[[Image:boundary_type.png|center]]
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''Note: the [[GENIE_Gridspec|gridspec overview]] contains introductory and background information on the gridspec; more detailed information can be found in Balaji's gridspec document on the [http://www.earthsystemcurator.org/index.php?option=com_content&task=view&id=38&Itemid=74 Earth System Curator] website.''

Latest revision as of 17:56, 26 February 2007

Boundary contact regions occur where two grid tiles meet, but do not overlap. The boundary type below is suitable for grid tiles with logically-rectangular discretisations; it consists of:

  • An anchor point - a point common to both grid tiles;
  • An "alignment" flag, used to indicate whether the anchor point is shared in index space by both tiles;
  • An orientation, which can be used to indicate how vector fields are transformed as they cross the boundary - for instance, whether latitudes on the first grid tile map to latitudes or longitudes on the second grid tile;
  • A refinement, which describes whether grid lines (cell edges) are continuous between tiles, just continuous for the coarser tile, or coprime.
Boundary type.png

Note: the gridspec overview contains introductory and background information on the gridspec; more detailed information can be found in Balaji's gridspec document on the Earth System Curator website.