Concise Binary Object Representation (CBOR) Tag for Coordinate Reference System (CRS) Specification
draft-clarke-cbor-crs-00

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Network Working Group                                          T. Clarke
Internet-Draft                                                      BATC
Intended status: Informational                            March 22, 2019
Expires: September 23, 2019

Concise Binary Object Representation (CBOR) Tag for Coordinate Reference
                       System (CRS) Specification
                        draft-clarke-cbor-crs-00

Abstract

   The Concise Binary Object Representation (CBOR, RFC 7049) is a data
   format whose design goals include the possibility of extremely small
   code size, fairly small message size, and extensibility without the
   need for version negotiation.

   In CBOR, one point of extensibility is the definition of CBOR tags.
   An existing CBOR tag, 103, allows for the representation of
   geographic coordinates.  Proper exploitation of geographic
   coordinates requires an associated reference frame.  The present
   document defines a CBOR tag for referencing the coordinate reference
   system (CRS) for a geographic coordinate.  It is intended as the
   reference document for the IANA registration of the CBOR tag defined.

Status of This Memo

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Copyright Notice

   Copyright (c) 2019 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

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   This document is subject to BCP 78 and the IETF Trust's Legal
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   (https://trustee.ietf.org/license-info) in effect on the date of
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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Objectives  . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Applicability . . . . . . . . . . . . . . . . . . . . . . . .   3
   4.  Semantics . . . . . . . . . . . . . . . . . . . . . . . . . .   3
     4.1.  Well-known Text . . . . . . . . . . . . . . . . . . . . .   3
     4.2.  EPSG Spatial Reference Identifier . . . . . . . . . . . .   3
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   3
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .   4
   7.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   4
     7.1.  Normative References  . . . . . . . . . . . . . . . . . .   4
     7.2.  Informative References  . . . . . . . . . . . . . . . . .   4
   Appendix A.  Examples . . . . . . . . . . . . . . . . . . . . . .   5
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .   6

1.  Introduction

   Specifying geographic coordinates for a location on Earth requires
   the definition of a coordinate reference system (CRS).  A CRS is made
   up of several components: [EDS1]

   o  Coordinate system: The X, Y grid upon which your data is overlayed
      and how you define where a point is located in space.

   o  Horizontal and vertical units: The units used to define the grid
      along the x, y (and z) axis.

   o  Datum: A modeled version of the shape of the Earth which defines
      the origin used to place the coordinate system in space.  You will
      learn this further below.

   o  Projection Information: The mathematical equation used to flatten
      objects that are on a round surface (e.g. the Earth) so you can
      view them on a flat surface (e.g. your computer screens or a paper
      map).

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2.  Objectives

   This document aims to address the specification of coordinate
   reference systems in CBOR [RFC7049] encoded data.  This is
   accomplished using complete CRS specification or through a well-known
   spatial reference identifier.

3.  Applicability

   This tag is designed for use with the Geographic Coordinates CBOR Tag
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