[eml-dev] How to define Space Oblique Mercator projection in EML?...

[Mark Servilla]

Hi Matt,

Yes, I'll enter it into Bugzilla.

Sincerely,
Mark

Matt Jones wrote:
> Hi Mark,
> 
> So far I haven't seen a reply to your message about this spatial
> metadata question in EML a while back.  It seems like a significant
> issue, so it should probably be entered into the EML bug list.
> Unfortunately, I don't have the expertise to address it (I've been
> waiting and hoping Peter might address it).  So maybe sending it out
> again will get a response.  Could you describe the problem in a bug if
> you haven't already resolved it?  Thanks,
> 
> Matt
> 
> Mark Servilla wrote:
> 
>>EML wizards and gurus,
>>
>>I am having trouble defining the Space Oblique Mercator map projection
>>in the spatialRaster subtree of EML.  The problem is unique to the SOM
>>(any oblique map projection, for that matter) projection - the SOM does
>>not use a prime meridian in the usual sense (i.e., it is fixed to the
>>flight path of the Landsat satellite, not a geographic coordinate system).
>>Since EML requires the primeMeridian-longitude and unit-name attributes
>>to be strictly defined, the document will not validate.  Is there a
>>recommendation *thanks in advance* from the EML community for how to deal
>>with this issue, perhaps making the aforementioned attributes optional?
>>
>>I have included below an example of how I would define this projection.
>>
>>Notes:
>>1. The SOM projection does not appear to be common in the remote
>>sensing world other than EOSAT/Landsat/IRS formats.  Unfortunately, we have
>>much data in this projection.
>>2. FGDC has a separate element for this projection in their schema.
>>Actually, FGDC has a separate element for each major projection definition.
>>
>><spatialReference>
>>    <horizCoordSysDef name="SOM">
>>        <projCoordSys>
>>            <geogCoordSys>
>>                <datum/>
>>                <spheroid name="International_1909"
>>semiAxisMajor="6378388"  denomFlatRatio="0.996633"/>
>>                <primeMeridian longitude=""/>
>>                <unit name="">
>>            </geogCoordSys>
>>            <projection>
>>                <parameter name="Landsat_Number" value="5"/>
>>                <parameter name="Landsat_Path" value="36"/>
>>                <parameter name="False_Easting" value="0"/>
>>                <parameter name="False_Northing" value="0"/>
>>                <unit name="meter">
>>            </projection>
>>        </projCoordSys>
>>    </horizCoordSysDef>
>></spatialReference>
>>
>>Sincerely,
>>Mark
> 
> 

-- 
Mark Servilla, Ph.D.

LTER Network Office
Department of Biology
MSC 03 2020
1 University of New Mexico
Albuquerque, NM 87131-0001

servilla at lternet.edu
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