Download Applying and extending Oracle Spatial by Simon Greener, Siva Ravada PDF

By Simon Greener, Siva Ravada

ISBN-10: 184968636X

ISBN-13: 9781849686365

ISBN-10: 1849686378

ISBN-13: 9781849686372

This booklet is a complicated sensible consultant to employing and increasing Oracle Spatial. This e-book is for current clients of Oracle and Oracle Spatial who've, at a minimal, simple operational adventure of utilizing Oracle or an identical database. complicated talents aren't required

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These types of SRS usually have a reference system that can relate the coordinates of the spatial data to locations on Earth. A unit of measurement is also associated with an SRS so that measurements can be done using a well-defined system. A non-geographic SRS is used when the spatial data is not directly related to locations on Earth. But these systems usually have a unit of measurement associated with them. Building floor plans is a good example of spatial data that is often not directly related to locations on Earth.

The definition of an SRS can be easily obtained by looking at the well-known text (WKT) for that SRS. CS_SRS view. In addition to this view, there are several other metadata tables under MDSYS that contain more details on how these SRSs are defined. Oracle Spatial also supports the EPSG standard-based SRSs. SRS in Oracle Spatial is flexible and allows users to define new reference systems if they are not present in the supplied SRSs. We will revisit user-defined SRSs in the following chapters. Creating spatial metadata The tables used in our sample schema contain data that is geographically referenced.

05 means a tolerance of 5cm. For geodetic data, it is recommended that the tolerance should not be less than 5cm for all of the topology and distance-based operations. 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.

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Applying and extending Oracle Spatial by Simon Greener, Siva Ravada

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