[GeoNetwork-users] Using GeoNetwork and ISO19115 for localspatial reference system

[S G. <sgo...@bt...>]

Dear Jeroen Ticheler, A. Soroka, John Hockaday and Antony Cooper, 

{[Jer...@ge...], [aj...@vi...],
[Joh...@ga...] and [AC...@cs...]}

Thank you all very much for you various responses which were all very
helpful. 

We will have to take a look at ISO 19111 which three of you suggested as
the standard for a unique coordinate reference system: and then create
metadata for that using GeoNetwork if that works.

I am aware of a wide range of reference system parameters under Sections
A.2.7 and the table B.2.7 in the ISO 19115 standard but I have been
unable to find these fields in the GeoNetwork metadata editor (or any
others I have looked at). So my difficulty appears at this stage to be
more with the implementation (e.g. GeoNetwork) than the ISO 19115
standard itself. This was mixed up in my original email so thanks for
the correction. 

It is very reassuring (A.Soroka) that you feel the ISO and FGDC
standards to be of similar richness in coordinate reference system
expression. So far however I have seen some impressive reference system
sections for metadata produced using FGDC but none using ISO 19115.
Maybe I have not looked far enough or it is still early days for ISO
implementation. 

A question remains to me therefore as to whether the rich list of
parameters for reference systems in the ISO 19115 standard (e.g.
projection, ellipsoid, datum, etc, parameters under A.2.7. and B.2.7) is
available through the GeoNetwork metadata editor. I have searched the
"advanced editor" pages with the ISO standard document at my side but
have not yet found any of these parameters. Where are they hidden? It is
a mystery. 

Thanks again to you all for your replies:  all greatly appreciated.

Steve Gossage
M.Sc. student
City University
London
U.K.




-----Original Message-----
From: ajs6f [mailto:aj...@vi...] 
Sent: 11 December 2008 20:46
To: Geonetwork Users
Subject: Re: [GeoNetwork-users] Using GeoNetwork and ISO19115 for
localspatial reference system

I'm not a particular expert on the use of the ISO standards, but I  
have some questions that may help clarify your issues:

Have you examined ISO 191915 Section A.2.7  "Reference system  
information" and found it lacking? It appears to me (and to our  
specialists here at the University of Virginia) to be more-or-less as  
complete in expressive ability as FGDC.

Also, have you examined the FGDC - ISO crosswalk at:

http://www.fgdc.gov/metadata/documents/FGDC_Sections_v40.xls/view

? It includes a section mapping from FGDC Sections 4.1 and 4.2 to ISO  
that may help you.

As far as expressing unique reference systems, have you examined ISO  
19111: "Geographic information -- Spatial referencing by coordinates"?


---
A. Soroka / Digital Scholarship Services R & D
the University of Virginia Library



On Dec 11, 2008, at 11:22 AM, S GOSSAGE wrote:

> Dear All,
>
> I am a new user of GeoNetwork and am greatly impressed. I am using the
> online metadata editor to prepare metadata for a time series of data  
> for
> repeated measurements of coastal dune topography on part of a small
> island off the Norfolk (UK) coast, for long term coastal
> geomorphological research. In the absence of national trigonometric
> reference points on the island, the research created its own local
> coordinate / spatial reference system for the early years of
> measurement. We would like to describe this local coordinate system
> using ISO19115. Apart from referring to an external document, it is  
> not
> obvious how to do this in ISO19115, and I have a number of related
> questions.
>
> 1. It appears that ISO19115 is very much less rich in the number of
> fields for describing coordinate / spatial reference systems  
> compared to
> the FGDC "Content Standard for Digital Geospatial Metadata" standard.
> This seems very strange given the importance to data use of the  
> spatial
> reference system, and that ISO is the international standard. Is there
> any specific reason for this?
>
> 2. Several of the more explicit spatial reference system fields  
> which do
> appear in the ISO19115 standard (e.g. "projection", "ellipsoid",  
> datum",
> (IDs 190 to 193) etc) do not appear in the GeoNetwork online editor  
> (or
> others I have seen). Why is this? Is it because ISO19139 does not  
> cover
> these ISO19115 fields?
>
> 3. What is the best way to describe a local spatial reference system
> using GeoNetwork and the full ISO19115 / ISO19139 standard?
>
> I would be very grateful if anyone can shed any light on any of these
> issues.
>
> Thanks in advance,
>
> Steve Gossage
> M.Sc. student
> City University
> London
> U.K.
>