Relative Location Representation
RFC 7035

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Internet Engineering Task Force (IETF)                        M. Thomson
Request for Comments: 7035                                     Microsoft
Category: Standards Track                                       B. Rosen
ISSN: 2070-1721                                                  Neustar
                                                              D. Stanley
                                                          Aruba Networks
                                                                G. Bajko
                                                                   Nokia
                                                              A. Thomson
                                                            Lookingglass
                                                            October 2013

                    Relative Location Representation

Abstract

   This document defines an extension to the Presence Information Data
   Format Location Object (PIDF-LO) (RFC 4119) for the expression of
   location information that is defined relative to a reference point.
   The reference point may be expressed as a geodetic or civic location,
   and the relative offset may be one of several shapes.  An alternative
   binary representation is described.

   Optionally, a reference to a secondary document (such as a map image)
   can be included, along with the relationship of the map coordinate
   system to the reference/offset coordinate system, to allow display of
   the map with the reference point and the relative offset.

Status of This Memo

   This is an Internet Standards Track document.

   This document is a product of the Internet Engineering Task Force
   (IETF).  It represents the consensus of the IETF community.  It has
   received public review and has been approved for publication by the
   Internet Engineering Steering Group (IESG).  Further information on
   Internet Standards is available in Section 2 of RFC 5741.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   http://www.rfc-editor.org/info/rfc7035.

Thomson, et al.              Standards Track                    [Page 1]
RFC 7035                    Relative Location               October 2013

Copyright Notice

   Copyright (c) 2013 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Thomson, et al.              Standards Track                    [Page 2]
RFC 7035                    Relative Location               October 2013

Table of Contents

   1. Introduction ....................................................4
   2. Conventions Used in This Document ...............................4
   3. Overview ........................................................4
   4. Relative Location ...............................................7
      4.1. Relative Coordinate System .................................8
      4.2. Placement of XML Elements ..................................8
      4.3. Binary Format ..............................................9
      4.4. Distances and Angles .......................................9
      4.5. Value Encoding ............................................10
      4.6. Relative Location Restrictions ............................10
      4.7. Baseline TLVs .............................................10
      4.8. Reference TLVs ............................................10
      4.9. Shapes ....................................................11
           4.9.1. Point ..............................................11
           4.9.2. Circle or Sphere Shape .............................12
           4.9.3. Ellipse or Ellipsoid Shape .........................13
           4.9.4. Polygon or Prism Shape .............................15
           4.9.5. Arc-Band Shape .....................................18
      4.10. Dynamic Location TLVs ....................................20
           4.10.1. Orientation .......................................20
           4.10.2. Speed .............................................20
           4.10.3. Heading ...........................................20
      4.11. Secondary Map Metadata ...................................21
           4.11.1. Map URL ...........................................21
           4.11.2. Map Coordinate Reference System ...................21