Concise Binary Object Representation (CBOR) Tag for Coordinate Reference System (CRS) Specification
draft-clarke-cbor-crs-02
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Network Working Group T. Clarke
Internet-Draft BATC
Intended status: Informational March 17, 2020
Expires: September 18, 2020
Concise Binary Object Representation (CBOR) Tag for Coordinate Reference
System (CRS) Specification
draft-clarke-cbor-crs-02
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
This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79.
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This Internet-Draft will expire on September 18, 2020.
Copyright Notice
Copyright (c) 2020 IETF Trust and the persons identified as the
document authors. All rights reserved.
Clarke Expires September 18, 2020 [Page 1]
Internet-Draft cborcrs March 2020
This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents
(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).
Clarke Expires September 18, 2020 [Page 2]
Internet-Draft cborcrs March 2020
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 (104) is designed for use with the Geographic Coordinates
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