Great, first hit from Andrea. I am awaiting if Even strikes back. His creation (GDAL JP2OpenJPEG driver) writes out EPSG:4326 coverage into GML JP2 this way, without having gridFunction.
<gml:FeatureCollection xmlns:gml="http://www.opengis.net/gml"; xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; xsi:schemaLocation="http://www.opengis.net/gml http://schemas.opengis.net/gml/3.1.1/profiles/gmlJP2Profile/1.0.0/gmlJP2Profile.xsd";> <gml:boundedBy> <gml:Envelope srsName="urn:ogc:def:crs:EPSG::4326"> <gml:lowerCorner>61.7282236395245 24.7248340978191</gml:lowerCorner> <gml:upperCorner>61.7838827490233 24.8422668729657</gml:upperCorner> </gml:Envelope> </gml:boundedBy> <gml:featureMember> <gml:FeatureCollection> <gml:featureMember> <gml:RectifiedGridCoverage dimension="2" gml:id="RGC0001"> <gml:rectifiedGridDomain> <gml:RectifiedGrid dimension="2"> <gml:limits> <gml:GridEnvelope> <gml:low>0 0</gml:low> <gml:high>15517 7354</gml:high> </gml:GridEnvelope> </gml:limits> <gml:axisName>x</gml:axisName> <gml:axisName>y</gml:axisName> <gml:origin> <gml:Point gml:id="P0001" srsName="urn:ogc:def:crs:EPSG::4326"> <gml:pos>61.7838789652633 24.7248378815791</gml:pos> </gml:Point> </gml:origin> <gml:offsetVector srsName="urn:ogc:def:crs:EPSG::4326">0 7.56751998624388e-006</gml:offsetVector> <gml:offsetVector srsName="urn:ogc:def:crs:EPSG::4326">-7.56751998624388e-006 0</gml:offsetVector> </gml:RectifiedGrid> </gml:rectifiedGridDomain> <gml:rangeSet> <gml:File> <gml:rangeParameters/> <gml:fileName>gmljp2://codestream/0</gml:fileName> <gml:fileStructure>Record Interleaved</gml:fileStructure> </gml:File> </gml:rangeSet> </gml:RectifiedGridCoverage> </gml:featureMember> </gml:FeatureCollection> </gml:featureMember> </gml:FeatureCollection> -Jukka- Lähettäjä: andrea.a...@gmail.com [mailto:andrea.a...@gmail.com] Puolesta Andrea Aime Lähetetty: 3. huhtikuuta 2017 15:58 Vastaanottaja: Rahkonen Jukka (MML) <jukka.rahko...@maanmittauslaitos.fi> Kopio: 'gdal-dev@lists.osgeo.org' (gdal-dev@lists.osgeo.org) <gdal-dev@lists.osgeo.org>; geoserver-de...@lists.sourceforge.net Aihe: Re: [gdal-dev] GML lat-lon coverages and interoperability On Mon, Apr 3, 2017 at 2:32 PM, Rahkonen Jukka (MML) <jukka.rahko...@maanmittauslaitos.fi<mailto:jukka.rahko...@maanmittauslaitos.fi>> wrote: With orthophoto coverages I believe that all cases could be handled with the default gridFunctions: startPoint at gml:Low, axisOrder +1 +2, sequence rule “Linear”. As far as I have understood GDAL trusts that this is also what the other partners do. However, it seems that GeoServer developers have decided to handle the latitude-longitude axis flip in WCS 2.0.1 by changing the order of grid axis with a function instead of writing the offsetVectors to suit with the default +1 +2 axis order. <gml:coverageFunction> <gml:GridFunction> <gml:sequenceRule axisOrder="+2 +1">Linear</gml:sequenceRule> <gml:startPoint>0 0</gml:startPoint> </gml:GridFunction> </gml:coverageFunction> Hi Jukka, the decision was not arbitrary, and imho, necessary. Rasters pixels are normally represented as east/north, but OGC forces us to describe geographic data in lat/lon order. So how do you tell the client, "look, I'm telling you that the axis order is north/east, but really, I'm giving you back data in east/north order instead"? Cheers Andrea -- == GeoServer Professional Services from the experts! Visit http://goo.gl/it488V for more information. == Ing. Andrea Aime @geowolf Technical Lead GeoSolutions S.A.S. Via di Montramito 3/A 55054 Massarosa (LU) phone: +39 0584 962313 fax: +39 0584 1660272 mob: +39 339 8844549 http://www.geo-solutions.it http://twitter.com/geosolutions_it AVVERTENZE AI SENSI DEL D.Lgs. 196/2003 Le informazioni contenute in questo messaggio di posta elettronica e/o nel/i file/s allegato/i sono da considerarsi strettamente riservate. Il loro utilizzo è consentito esclusivamente al destinatario del messaggio, per le finalità indicate nel messaggio stesso. Qualora riceviate questo messaggio senza esserne il destinatario, Vi preghiamo cortesemente di darcene notizia via e-mail e di procedere alla distruzione del messaggio stesso, cancellandolo dal Vostro sistema. Conservare il messaggio stesso, divulgarlo anche in parte, distribuirlo ad altri soggetti, copiarlo, od utilizzarlo per finalità diverse, costituisce comportamento contrario ai principi dettati dal D.Lgs. 196/2003. 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