How to Use MultiNet Shapefile and OSL
Parent topic: How to Use MultiNet Shapefile and OSL

How to Use Index Areas for Index Building - examples

The examples below show how TomTom applies Index Areas to use for index building in certain geographic areas. The examples are meant to show how some of the same procedures and principals may be applied to other geographic areas depending on a country's Administrative structure.

Example: Scheveningen in the Netherlands

"Den Haag" is an Order 8 Administrative Area. It contains an area called "Scheveningen" that is known by the public, but has no Administrative reference.

The Area of Scheveningen is captured by TomTom as an Order 9 Index Area. This results in additional "Order 9" information that can be added to other Administrative Order 9 Areas.

There is no "Area replaced by Index Area" Relationship, but there is a "Place within Place" Relationships that can be used.

Figure: Scheveningen Located in Den Haag

Index Building for the Netherlands

  1. Start with the lowest Index Area Order (highest Index Area Order number - e.g., Index Order 9).
  2. Use "Place within Place" to find the Administrative Area Order 8 (in this case "Den Haag")

    Figure: Index Building for the Netherlands - 1 of 2

  3. Use the hierarchical structure to go down from Admin Order 8 to find the other Administrative Order 9 Areas.
Result: The Index has all Administrative Areas and the additional Index Area Order 9 called "Scheveningen." See figure below.

Figure: Index Building for the Netherlands - 2 of 2

Example: Brussels in Belgium

Brussels exists as a capital region: Administrative Area Order 1. It also exists as an Administrative Area Order 8. This Order 8 does not correspond to the public perception of Brussels. The Administrative Area Order 1 "Brussels" consists of 19 Order 8 Administrative Areas of which Brussels Administrative Area Order 8 is one.

Figure: Perimiter of Entire Area is Administrative Area Order 1 - Brussels

Within Order 1 are Administrative Area Order 8s including Brussel Administrative Area Order 8. The other 18 Order 8 Administrative Areas are also considered by the public as being "Brussels". Therefore, an Order 8 Index Area "Brussels" must be created to cover the 19 other Administrative Order 8 areas.
Index Building for Brussels
  1. Create an Index Area Order 8 "Brussels" that contains all the Administrative Order 8 Areas now contained in Administrative Area Order 1 "Brussels"
    • Select the 19 Administrative Area Order 8s (a8) and match them to the Adminstrative Area Order 8s that are in the Area Replaced by Index Area file (ai). See the figure below.

      Figure: Administrative Area Order 8s in the ai File

  2. Add the Administrative Order 9s to the Area Replaced by Index Area (ai) file to make it an Index Area Order 9. The ai file now contains the previous Administrative Order 8 areas (feature 1119) and the exisiting Administrative Order 9 areas (feature 1120).

    Figure: Add the Administrative Order 9s (a9) to the Area Replaced by Index Area (ai) file to make it an Index Area Order 9

  3. Use the "Place within Place" relation (pp) to relate the previous 19 Administrative Order 8 Areas (now Index Order 9 Area) to the Index Order 8 Area, "Brussel."

    Figure: Relating the previous 19 Administrative Order 8 Areas (now Index Order 9 Area) to the Index Order 8 Area

  4. Use the "Place within Place" relation to build the Index Areas hierarchy.

    Figure: Relating Index Order 8 Area , "Brussel," to Administrative Order 7 Area "Brussel Hoofdstad."

    The above actions now relate Index Order 8 Area , "Brussel," to Administrative Order 7 Area, "Brussel Hoofdstad."

  5. Use the "Area replaced by Index Area" relation to remove the unwanted Administrative Order 8 Areas from the Index Order 8 list.
The hierarchy model is shown below.

Figure: Brussels Hierarchy

Special Use of Relationships in Top Down Indexing - U.K.

For the United Kingdom, every Administrative Order 7, 8 and 9 has a relationship "Area replaced by Index Area". Performing the above described top-down Index building, the Index first has all Administrative Areas together with all Index Areas. The "Area replaced by Index Area" Relationship allows exclusion of all Administrative Areas Order 7, 8 and 9.

Parent topic: How to Use MultiNet Shapefile and OSL