Hi, I feel that you did not quite get what I had in my mind. At the moment if layer has an unknown SRID OJ does know the envelope and reports it in the layer properties, but it is not saved with JML as boundedBy (one_point_no_srid.jml) If SRID is set then <CRSElement>boundedBy</CRSElement> and boundedBy get added (one_point_srid_4326).
My question (suggestion) was if boundedBy could be written also in case of unknown SRID like in (suggestion_one_point_no_srid.jml). I made also some tests with layers which do not have any geometries and layers which have only empty geometries. For both the envelope is actually non-existing but OpenJUMP seems to have an internal fake default envelope 0.00,0.00 -1.00,-1.00 (no_features_srid_4326.jml) GDAL developer asked me how to write the boundedBy if the envelope is null and gave two alternatives. 1) Use gml:null <gml:boundedBy> <gml:null>unknown</gml:null> </gml:boundedBy> 2) Not to write gml:boundedBy at all but still keep <CRSElement>boundedBy</CRSElement> in the inputTemplate part of JML file. OpenJUMP seems to be robust and accepts both 1) and 2). And as mentioned, internally openJUMP seems to be using method 3) with fake 0,0 -1,-1 extent. Any opinions about what I will ask the GDAL developer to do? I know that there is a very, very small corner case that alternatives 1) and 2) can't handle which is empty layers with a known SRID, or layers with features but no geometries. I would say that we don't care about those. I think that I also found a bug in SRID boundedBy writer. If the locale is set to Finnish then comma is used as decimal separator. File "one_point_srid_4326" shows this bug. -Jukka- -----Alkuperäinen viesti----- Lähettäjä: edgar.sol...@web.de [mailto:edgar.sol...@web.de] Lähetetty: 18. tammikuuta 2018 14:31 Vastaanottaja: jump-pilot-devel@lists.sourceforge.net Aihe: Re: [JPP-Devel] New SRID system and unknown SRID Jukka, the envelope is currently always generated by iterating over all feature geometries of a vector layer. possibly cached if no geometry changed, not sure though. there is _no_ functionality to read an envelope and memorize it for later for vector layers as far as i could see when implementing the GML SRID support. stormy salutations ..ede On 18.01.2018 12:43, Rahkonen Jukka (MML) wrote: > Hi Ede and others, > > New OJ with the SRID support in JML writes our the JML file without > boundedBy element when the SRID is not known. But perhaps it would be > good for some use cases to have a fast access to layer extents also in > that case by write the boundedBy but without srsName > > <gml:boundedBy> > <gml:Box> > <gml:coordinates decimal="." cs="," ts=" ">28,00,20,00 > 110,00,104,00</gml:coordinates> > </gml:Box> > </gml:boundedBy> > > OpenJUMP reads this data OK and informs in the layer capabilities that the > SRID is EPSG:0 (unknown) which feels good to me. > What do you think? > > -Jukka Rahkonen- > > > > ---------------------------------------------------------------------- > -------- Check out the vibrant tech community on one of the world's > most engaging tech sites, Slashdot.org! http://sdm.link/slashdot > > > > _______________________________________________ > Jump-pilot-devel mailing list > Jump-pilot-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/jump-pilot-devel > ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Jump-pilot-devel mailing list Jump-pilot-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/jump-pilot-devel
one_point_no_srid.jml
Description: one_point_no_srid.jml
one_point_srid_4326.jml
Description: one_point_srid_4326.jml
suggestion_one_point_no_srid.jml
Description: suggestion_one_point_no_srid.jml
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