Difference between revisions of "Datové typy SDO Geometry"
From Wikivyuka
m |
m |
||
| Line 15: | Line 15: | ||
*L identifies the linear referencing measure dimension for a three-dimensional linear referencing system (LRS) geometry, that is, which dimension (3 or 4) contains the measure value. For a non-LRS geometry, or to accept the Spatial default of the last dimension as the measure for an LRS geometry, specify 0. For information about the linear referencing system (LRS). | *L identifies the linear referencing measure dimension for a three-dimensional linear referencing system (LRS) geometry, that is, which dimension (3 or 4) contains the measure value. For a non-LRS geometry, or to accept the Spatial default of the last dimension as the measure for an LRS geometry, specify 0. For information about the linear referencing system (LRS). | ||
*TT identifies the geometry type (00 through 09, with 10 through 99 reserved for future use). | *TT identifies the geometry type (00 through 09, with 10 through 99 reserved for future use). | ||
| + | |||
| + | Například: | ||
| + | |||
| + | 2001 dvoudimenzionální point | ||
| + | 2002 linie nebo křivka | ||
| + | 2003 dvoudimenzionální polygon nebo povrch | ||
| + | 2004 kolekce | ||
| + | |||
Revision as of 12:04, 24 March 2010
SDO_Geometry je objekt, který má následující atributy:
SDO_GTYPE NUMBER, SDO_SRID NUMBER, SDO_POINT SDO_POINT_TYPE, SDO_ELEM_INFO MDSYS.SDO_ELEM_INFO_ARRAY, SDO_ORDINATES MDSYS.SDO_ORDINATE_ARRAY
Je nutné vnímat "skladbu" tohoto objektu. Při zadávání dat potřebujeme znát kódy, které mají význam pro správné určení geometrie či koordinačního (souřadnicového) systému, ap.
SDO_GTYPE NUMBER - typ geometrie, koresponduje se specifikací modelu "Geometry Object Model" definovanou organizací OGIS - Simple Features for SQL specification.
Skládá se ze 4 numerických hodnot ve formátu DLTT, kde
- D identifies the number of dimensions (2, 3, or 4)
- L identifies the linear referencing measure dimension for a three-dimensional linear referencing system (LRS) geometry, that is, which dimension (3 or 4) contains the measure value. For a non-LRS geometry, or to accept the Spatial default of the last dimension as the measure for an LRS geometry, specify 0. For information about the linear referencing system (LRS).
- TT identifies the geometry type (00 through 09, with 10 through 99 reserved for future use).
Například:
2001 dvoudimenzionální point 2002 linie nebo křivka 2003 dvoudimenzionální polygon nebo povrch 2004 kolekce
SDO_SRID NUMBER, SDO_POINT SDO_POINT_TYPE, SDO_ELEM_INFO MDSYS.SDO_ELEM_INFO_ARRAY, SDO_ORDINATES MDSYS.SDO_ORDINATE_ARRAY
