5.6 Showing Data on Maps

Use a Map region to display data related to specific locations or areas on the earth. One map can show multiple layers when needed. For each layer you configure a table, SQL query, or other data source, and choose a layer type.

• Choosing a Map Layer Type
  A map can show multiple layers. For each one, configure a table, SQL query, or other data source, and choose a layer type.
• Adding a Layer of Points
  Consider a map layer that shows each employee's home address as a point by joining EMP with a separate EMP_ADDRESSES table. You can configure a single data source at the map region level, then reference it in the layers. Or each layer can define its own data source.
• Conveying Quantities with a Heat Map
  A Heat Map layer associates an additional quantity to a point to convey how that value differs at different points on the map.
• Simplifying Points and Distance
  The SDO_GEOMETRY type lets your applications store, search on, and manipulate spatial data.
• Distance from a Point of Reference
  Using a database view, you can simplify pages that present the distance between points using helper functions.