[tdwg-content] minimum/maximum elevation and depth - usage and priority?

Tony.Rees at csiro.au Tony.Rees at csiro.au
Tue Jul 3 03:38:10 CEST 2012

Hi Dean, all,

Selected fisheries-related terms such as these are handled in the OBIS schema for marine species data (http://www.iobis.org/node/304) which is an OBIS extension to Darwin Core. I do not know whether there is a move to migrate any of these extensions into DwC proper, but maybe there could be?


Tony Rees

From: tdwg-content-bounces at lists.tdwg.org [tdwg-content-bounces at lists.tdwg.org] On Behalf Of Dean Pentcheff [pentcheff at gmail.com]
Sent: Tuesday, 3 July 2012 11:33 AM
To: tdwg-content at lists.tdwg.org
Subject: Re: [tdwg-content] minimum/maximum elevation and depth - usage and     priority?

I was all ready to contribute this remark:
  For trawl-type sampling, these would likely be used for the
trawl-start depth and trawl-end depth. The implication of this kind of
usage is that the sample is not, in fact, a point sample, but linear.

But I have now realized that this is a misuse of those terms
(obviously start does not equal minimum, nor is there anything like
"startLatitude" and "endLatitude" in Darwin Core).

How does one handle trawl-type sampling (a single sample taken along a
line) in a Darwin Core context?

Dean Pentcheff
pentcheff at gmail.com
dpentche at nhm.org

On Mon, Jul 2, 2012 at 1:46 AM, Aaike De Wever
<aaike.dewever at naturalsciences.be> wrote:
> Dear all,
> While composing a template and recommendations for the Darwin Core fields to supply for the BioFresh project <http://www.freshwaterbiodiversity.eu/>, similar to what Peter Desmet did for herbaria in Apple Core <http://code.google.com/p/applecore/>, I came across a number of terms which I haven't yet completely understood and hope to get some feedback on from this community.
> The terms I am referring to are:
> * minimumElevationInMeters - maximumElevationInMeters
> http://rs.tdwg.org/dwc/terms/minimumElevationInMeters - http://rs.tdwg.org/dwc/terms/maximumElevationInMeters
> The lower limit of the range of elevation (altitude, usually above sea level), in meters.
> * minimumDepthInMeters - maximumDepthInMeters
> http://rs.tdwg.org/dwc/terms/minimumDepthInMeters - http://rs.tdwg.org/dwc/terms/maximumDepthInMeters
> The lesser/greater depth of a range of depth below the local surface, in meters.
> Both for elevation and depth there are two terms representing the minimum and maximum, which I figure are meant to provide a range. As in most cases, for point data, there will be only one elevation and depth value, I was wondering what is the recommended best practice for these terms. Should one use minimum or maximum or provide the same value for both terms?
> Any advise on this would be appreciated!
> With best regards,
> --
> Aaike De Wever
> BioFresh Science Officer
> Freshwater Laboratory, Royal Belgian Institute of Natural Sciences
> Vautierstraat 29, 1000 Brussels
> Belgium
> tel.: +32(0)2 627 43 90
> mobile.: +32(0)486 28 05 93
> email: <aaike.dewever at naturalsciences.be>
> skype: aaikew
> AIM: aaike at mac.com
> LinkedIn: <http://be.linkedin.com/in/aaikedewever>
> BioFresh: <http://www.freshwaterbiodiversity.eu/> and <http://data.freshwaterbiodiversity.eu/>
> Belgian Biodiversity Platform: <http://www.biodiversity.be>
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