National Geodetic SurveyDiscussionDiscussion - FGDC Geographic Information - FGDC Geographic Information Framework Data Content Standard Part 4: Framework Data Content Standard Part 4:

Geodetic ControlGeodetic Control

Rick FooteRick FooteRick Foote@noaa.gov

2015 FGCS Meeting, Crystal City, VA1

Comparison of two documents

ISO 19111 Spatial Referencing by Coordinatesand

FGDC Geographic Information Framework Data Content Standard Part 4: Geodetic Control (Draft)

At the request of the FGDC Standards Coordinator, NGS was asked to look into the relationship between the content in both documents. The ISO document basically covers everything that the FGDC document covers, with the exception that the ISO documentation does not cover dynamic heights and geoid undulations, and there are some differences in terminology.

2

History of FGDC Geographic Information Framework

Data Content Standard Part 4:Geodetic Control (Draft)

3

2008 first released2009 2010 [No known use of standard]20112012 identified as one of the documents we would2013 update as evidence for the GAO2014 Feb 28, 2014 – FGCS request to reaffirm, revise, 2015 or withdraw the standard.

History of Geodetic Control (Draft)

4

Design Principles

Keep it simple

Use single data types.

Expect data providers to convert data to those data types

Require accuracy values to make data more meaningful

History of Geodetic Control (Draft)

– Example– designation – permanentIdentifier = DU0546– designation – namespace = NGS– designation – URI = http://www.ngs.noaa.gov/cgi-bin/ds_mark.prl?PidBox=DU0546– coordinates – horizontal – latitude =

33.0551990305– coordinates – horizontal – longitude = -111.4089207500– coordinates – horizontal – accuracy – network = 0.33 cm– coordinates – horizontal – accuracy – local = 0.56 cm– coordinates – horizontal – geodeticDatum – datum = NAD 83– coordinates – horizontal – geodeticDatum – datumTag = 2011– coordinates – horizontal – geodeticDatum – epochDate = 2010.00– coordinates – vertical – ellipsoidHeight = 503.783 m– coordinates – vertical – ellipsoidHeight – accuracy – network = 0.0082– coordinates – vertical – ellipsoidHeight – accuracy – local = 0.0133– coordinates – vertical – ellipsoidHeight – geodeticDatum – baseDatum = NAD 83– coordinates – vertical – ellipsoidHeight – geodeticDatum – datumTag = 2011– coordinates – vertical – ellipsoidHeight – geodeticDatum – epochDate = 2010.00

5

ISO 19111 web site

6

The next three slides are from Larry Hothem of USGS, who is the ISO/TC 211 Vice-Chair, and an invitation letter showing the June workshops to

discuss revisions of the ISO 19111

7

ISO/TC 211ISO/TC 211Geographic Information/GeomaticsGeographic Information/Geomatics

• ISO/TC 211 standards relevant to ICG WG-D, Reference ISO/TC 211 standards relevant to ICG WG-D, Reference Frames, Timing and ApplicationsFrames, Timing and Applications

– Spatial referencing by coordinates (IS 19111)Spatial referencing by coordinates (IS 19111)– Geodetic codes & parameters (TS 19127)Geodetic codes & parameters (TS 19127)– Procedures for item registration (IS 19135)Procedures for item registration (IS 19135)– Geodetic references (TR 19161)Geodetic references (TR 19161)– ISO Registry for Geodetic Codes and ParameterISO Registry for Geodetic Codes and Parameter

IS – International Standard; TS – Technical Specification; TR – IS – International Standard; TS – Technical Specification; TR – Technical ReportTechnical Report

ISO/TC 211

Scope of ISO/TC 211

• Standardization in the field of digital geographic Standardization in the field of digital geographic information.information.

• This work aims to establish a structured set of This work aims to establish a structured set of standards for information concerning objects or standards for information concerning objects or phenomena that are directly or indirectly associated phenomena that are directly or indirectly associated with a location relative to the Earth.with a location relative to the Earth.

• These standards may specify, for geographic These standards may specify, for geographic information, methods, tools and services for data information, methods, tools and services for data management (including definition and description), management (including definition and description), acquiring, processing, analyzing, accessing, presenting acquiring, processing, analyzing, accessing, presenting and transferring such data in digital/electronic form and transferring such data in digital/electronic form between different users, systems and locations.between different users, systems and locations.

• This work shall link to appropriate standards for This work shall link to appropriate standards for information technology and data where possible, and information technology and data where possible, and provide a framework for the development of sector-provide a framework for the development of sector-specific applications using geographic data.specific applications using geographic data.

IS 19111 – Spatial Referencing by IS 19111 – Spatial Referencing by Coordinates Coordinates

Scope: Scope: • Definition of the conceptual schema and guidelines for Definition of the conceptual schema and guidelines for

describing geodetic reference systemsdescribing geodetic reference systems. .

Purpose and justification:Purpose and justification:• Produce a conceptual Produce a conceptual schema for geodetic reference schema for geodetic reference

systems. systems. • Any coordinate-based usage of geographic Any coordinate-based usage of geographic

information needs a information needs a unique definition of the underlying unique definition of the underlying reference systemreference system..

• There are many well-established reference systems in There are many well-established reference systems in common use. Standardization in this area will common use. Standardization in this area will include include selected inter-national reference systems.selected inter-national reference systems.

11

I would like to invite you to participate in a two-day workshop to discuss ideas and reasons for a possible revision to ISO 19111, Spatial referencing by coordinates. This International Standard defines a data model for describing reference frames and transformations between frames. The workshop will be organized by the Control Body for the ISO Registry of Geodetic Codes and Parameters.

Note that the venues for the proposed dates of June 11 through 17 are at a location in Southampton, UK, in conjunction with or after the next meeting of ISO Technical Committee 211 (TC211) (who maintain ISO 19111), and the dates of June 18 through 22 are at a location in Prague, Czech Republic, before the next IUGG General Assembly.

Background

The work of the Control Body for the ISO Registry of Geodetic Codes and Parameters to develop a registry of reference systems and frames has identified issues with ISO 19111’s capability to describe modern dynamic 3D and 4D geometric reference systems and geoid-based vertical or geopotential datums. Before a new work item to revise 19111 is proposed to TC211 we wish to gather input from as many geodetic science experts as possible on the requirements for static and dynamic geodesy, regional and global reference frames, coordinate systems, etc. necessary today and for the foreseeable future.

Topics for the Workshop may include, but not be limited to:

• Geodetic reference frames• Geometric datums• Geopotential or geoidal-based datums• Vertical reference systems• Geometrical (ellipsoidal) and physical (normal, orthometric) heights• World height system• Dynamic aspects of geodetic reference frames• Transformations

(edited) Invitation to the next ISO 19111 Workshop

Please send comments to Larry Hothem at Lhothem@usgs.gov

Discussion:

12

Would there be any negative impact to your agency’s work if the FGDC Geographic Information Framework Data Content

Standard Part 4: Geodetic Control (Draft) Did not exist?