By Simon Greener, Siva Ravada
This booklet is a sophisticated useful advisor to making use of and increasing Oracle Spatial. This publication is for present clients of Oracle and Oracle Spatial who've, at a minimal, easy operational event of utilizing Oracle or an similar database. complex abilities aren't required
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Extra resources for Applying and extending Oracle Spatial
Most of the tables used in the current schema have spatial data in the California State Plane Zone 3 Coordinate System. In Oracle Spatial, the corresponding SRID for this SRS is 2872. 05 as our tolerance (that is, five-hundredths of a foot). 05)), 2872); The SDO_DIM_ELEMENT object is used to specify the lower and upper bounds for each dimension of the coordinate system along with the tolerance value. The metadata allows one entry for each dimension, even though it is very common to use the same tolerance value for the X and Y dimensions.
05)), 8307); As this is a geodetic system, the longitude range goes from -180 to 180 and the latitude range goes from -90 to 90. Even though it is normal practice to use these ranges for the metadata entry, many developers use the actual ranges spanned by the SDO_GEOMETRY object. Mapping tools and applications typically use this extent from the metadata to compute the initial extent of the data in each column of the spatial data. Any application looking for all the spatial columns in the database should select the data from the ALL_SDO_GEOM_METADATA view.
An entry must be created for each SDO_GEOMETRY column within a table; entries for SDO_GEOMETRY columns in views are optional. If a table has more than one column of type SDO_GEOMETRY, then there is one metadata entry for each column of spatial data in that table. The ALL_ view shows all of the spatial layers that can be accessed by the current user. If a user has the Select grant on another user’s table with SDO_GEOMETRY columns, the first user can see the metadata entries for those tables in the ALL_ view.