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

Aaike De Wever aaike.dewever at naturalsciences.be
Tue Jul 3 08:57:36 CEST 2012

Dear John,
Dear all,

Thanks a lot for the answers so far.

I am still curious about a good example of the min/max use, at first I
thought the trawl sampling was a good example as well, but I guess it
rather applies if you sampled an area with a certain radius around the
provided coordinates. As most data we will encounter will come from a
single point/elevation/depth, I am just a little worried that it may
puzzle data providers that they have to provide both min and max.

With best regards,

Hi Aaike,

These values are indeed meant to capture the range of possible
elevation/depth or the extent of them. If there upper and lower bounds
are the same, then the values in the minimum and maximum should be the



On Mon, Jul 2, 2012 at 8:38 AM, Aaike De Wever
<aaike.dewever at naturalsciences.be> wrote:
Dear all,

Following on my previous email, I also had a question on the following terms:
* minimumElevationInMeters - maximumElevationInMeters
http://rs.tdwg.org/dwc/terms/minimumElevationInMeters -
The lower limit of the range of elevation (altitude, usually above sea
level), in meters.

* minimumDepthInMeters - maximumDepthInMeters
http://rs.tdwg.org/dwc/terms/minimumDepthInMeters -
The lesser/greater depth of a range of depth below the local surface, in

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

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
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
Belgian Biodiversity Platform: <http://www.biodiversity.be>

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