Re: [galeon] Fwd: CDM feature and point types docs

• To: <gerry.creager@xxxxxxxx>, <galeon@xxxxxxxxxxxxxxxx>
• Subject: Re: [galeon] Fwd: CDM feature and point types docs
• From: <Simon.Cox@xxxxxxxx>
• Date: Fri, 14 Mar 2008 10:14:38 +0900

In fact what is measured is the property of the *stuff at the point* - i.e. this is a sampling issue. 
The stuff is the atmosphere, its property is its thermodynamic potential, and it is sampled at the 
point. This is what O&M Part 2 Sampling Features is about, and is why every sampling feature (of 
which SamplingPoint is a special case) has a "sampledFeature" such as "the 
atmosphere".

So, I suggest a good look at O&M Part 2 is in order. I know that Andrew W has 
already done this, since he was on the RWG and is credited as one of the 
contributors since he provided a lot of feedback.

Simon

-----Original Message-----
From: galeon-bounces@xxxxxxxxxxxxxxxx
[mailto:galeon-bounces@xxxxxxxxxxxxxxxx] On Behalf Of Gerry Creager
Sent: Friday, 14 March 2008 2:03 AM
To: Unidata GALEON
Subject: Re: [galeon] Fwd: CDM feature and point types docs

Ron, et al,

Ah, but then it becomes a science-discipline semantics issue, too.

I do think in terms of making "point" observations of in-situ weather data.  
The observation is made at a fixed location, at a particular finite time, and its 
geometric property is not a bounded region or polygon, but a point.  Realizing there are 
gaps in this (wind is measured at 10m above ground, temperature, humidity, pressure at 2 
meters, precipitation at 1 meter, direct and diffuse solar radiation at nominally 2m but 
may vary, etc) the data are represented to end-users as being at a single spatial point.  
Think of it as semantic collision rather than assimilation.

And, while I don't think I'm completely clueless, I've spoken at the TCs, and mentioned 
to you in the past, about "point features" in my use of WFS to represent 
observations, without discussion.

gerry

• Follow-Ups:
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    • From: Gerry Creager

• References:
  • [galeon] Fwd: CDM feature and point types docs
    • From: Ben Domenico
  • Re: [galeon] Fwd: CDM feature and point types docs
    • From: Ron Lake
  • Re: [galeon] Fwd: CDM feature and point types docs
    • From: Gerry Creager