Migrating to Spatial Analytics

You can migrate spatial data from other environments to Spatial Analytics.

  • When migrating spatial data from other environments, use the standard transport formats (WKT, WKB, GML, or SDE).
  • Spatial Analytics uses the following default settings:
    • The default units are the units that are associated with the coordinate system.
    • The default spatial reference system (SRS) is WGS 84, which has the SRS ID 4326.
    • The default number of segments for buffer calculations is 96 (the maximum). In PureData® System for Analytics, the default is 8 (the minimum). A larger number of segments makes the buffer smoother. For queries that calculate the intersection of a geometry with the buffer around second geometry, this can lead to differences when geometries are very close to the boundaries of the buffer.
    If these defaults do not suit your needs, modify your queries or application code to specify other values explicitly.
  • Spatial Analytics does not provide a spatial index or internal filtering mechanism. Consequently, executing cartesian joins on spatial data (for example, calculating the distance between geometries) can result in poor performance. To mitigate this, use a filtering mechanism to reduce the number of entries that are passed to a function that carries out a spatial join.