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ESW07 Location Formats: Convergence Now or Not at all?

ESW07 Location Formats: Convergence Now or Not at all?. Roger Marshall TeleCommunication Systems, Inc. (TCS) ESW07 4/10-12/2007. Location Formats – Civic vs. Geo, which is used for what?. Location type can be either civic or geodetic (“geo”) Call modes are either Static or Mobile

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ESW07 Location Formats: Convergence Now or Not at all?

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  1. ESW07Location Formats:Convergence Now or Not at all? Roger Marshall TeleCommunication Systems, Inc. (TCS) ESW07 4/10-12/2007

  2. Location Formats – Civic vs. Geo, which is used for what? • Location type can be either civic or geodetic (“geo”) • Call modes are either Static or Mobile • View Nomadic as either Static:(Re-provisioned), or Mobile:(Seldom updated) • Civic is fully compatible with Static use cases •  Mobile might use Civic for “rough” routing (when available) •  Mobile uses Geo for dispatch, and for precise routing (if avail. in time) •  Geo association with Static is becoming more prominent • Examples: Picocells, GPS-enabled APs, VoIP terminals w/built in LDT

  3. Location Formats: Civic & Geo – How they describe Static vs. Mobile • 3GPP/3GPP2 is focused solely on Mobile – is Geo all they want/need? • Is the IETF focused on Static vs. Mobile rather than Civic vs. Geo? • Review of Civic Location Characteristics/Issues • Civic is geared for urban/suburban applications – Lacks global scalability • Doesn’t fit rural areas (examples include rural route, PO Box #) • Not a candidate for direct automatic location generation • Review of Geo Location Characteristics/Issues • Has to be “rendered” by GIS to become useful, though most PSAPs do this today • Reverse geo-coding result may not always be correct • May not be determinable indoors (use cases better served by Civic form) • Goal of Civic vs. Geo comparison • Focus on use case Static vs. Mobile, and appropriate location follows

  4. Location Formats – Civic and Geo, Basis and Transformation • Location is determined as either Given, Measured, or Derived • Given - applied to a location that is stated, provisioned • Civic Addresses (typical) – these are entered into “Wiremap Databases” • Seldom is a Geo location “given” • Measured – applied to a location that is calculated • Geodetic (typical) • Impossible to “measure” or “calculate” a Civic location • Derived – applies to either Civic or Geo, the basis of GIS systems • Obtained as a result of a transformation using the other form as input • Examples include: Geo-coding and Reverse Geo-coding • Basis of existing (Pre-i2) VoIP routing today • Many issues and some opportunities around derived locations • Requires consistent National/International PSAP boundary layer (GIS shape file) • Some PSAPs implement reverse-parcel-based-mapping: • input a lat/lon and get a civic location + polygon • Consider extensions to existing GIS systems, such as Reference Point mapping: • Input in a civic location + key_indicator, • Output: Lat/Lon of street centerline + offset or front door or (2d) structure centroid, etc.

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