[Esip-documentation] Geospatial Bounds

[Jim Biard via Esip-documentation]

John,

So you are specifically speaking to the question of the vertical datum, 
not the horizontal?

I expect that you are right about the limited number of coordinate 
systems that will be used. I also think that opening these attributes up 
to include projected and Cartesian coordinates will cause headaches. I 
also wonder a bit if vertical bounds are really all that helpful, but 
I'm sure others disagree.

If we include language specifying the default (without EPSG code 
attributes) as WGS84 on the ellipsoid or some such (perhaps noting that 
the horizontal errors induced by using this vs a spherical Earth are 
small) then I guess I'm OK with it all.

Grace and peace,

Jim

On 10/8/14, 3:03 PM, John Graybeal via Esip-documentation wrote:
>> Useless? How so?
>
> The default CRS is based on vertical location relative to the geoid, 
> which says nothing about where the observation was made relative to 
> the surface of the ocean or land. So searches can't find all the wind 
> data between 3 and 10 meters above the surface, or all the oxygen 
> measurements between 1 and 10 meters below the surface.
>
> The arguments against this request make it seem like users everywhere 
> will be throwing in thousands of CRSs into these two attributes. But 
> really, there will not be that many, and very few (<5 I bet) that are 
> commonly used. Data providers will know that attributes based on 
> odd-ball CRSs will mean their data won't get indexed/searched by some 
> systems -- we can make that point explicitly in the definition. And I 
> bet everyone who can will just use the default. So it isn't like 
> you're losing any interoperability by offering this feature, and it 
> isn't obligating anyone to support the non-default CRS either.
>
> John
>
> On Oct 8, 2014, at 11:36, Jim Biard via Esip-documentation 
> <esip-documentation at lists.esipfed.org 
> <mailto:esip-documentation at lists.esipfed.org>> wrote:
>
>> Useless? How so?
>>
>> On 10/8/14, 2:12 PM, John Graybeal via Esip-documentation wrote:
>>>
>>> On Oct 8, 2014, at 10:59, Jim Biard via Esip-documentation 
>>> <esip-documentation at lists.esipfed.org 
>>> <mailto:esip-documentation at lists.esipfed.org>> wrote:
>>>
>>>> I would still like to hear a good argument for why we should allow 
>>>> free-form coordinate systems in the geospatial bounds attributes.
>>>
>>> There is a large community of users (oceanographic users/systems; 
>>> and I believe atmospheric and other terrestrial systems with sensors 
>>> located relative to ground level) that find geoidal vertical CRS 
>>> useless for describing/discovering their measurements.
>>>
>>> If that's not good enough, I got nothin'.
>>>
>>> John
>>>
>>>
>>>
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>>> Esip-documentation at lists.esipfed.org
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>>
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