hi Kate, >The other reported bug I should have mentioned and neglected to is some polygons showing that they have empty areas. >The suspected issue is that the polygon directions are going the wrong way.
Just to clarify, polygons should go in a clockwise direction? I wonder if any of the KeepRight-esque services check for this? As for projections, would it be worth noting the used projection on the download page? Thanks, Joseph On 18 April 2013 09:33, Kate Chapman <[email protected]> wrote: > Hi Stéphane, > > Yes the projection is one of the issues. And we did discover that changing > the projection does in fact cause issues for QGIS. Potentially we could > switch the data to WGS 84 instead of Web Mercator. > > The other reported bug I should have mentioned and neglected to is some > polygons showing that they have empty areas. The suspected issue is that > the polygon directions are going the wrong way. > > Best, > > -Kate > > > On Thu, Apr 18, 2013 at 3:06 PM, Stéphane Henriod <[email protected]> wrote: > >> Hi Maning >> >> this is probably due to happen with any ArcGIS version. >> >> I'd just like to add that this is not a major blocking issue. >> >> ArcGIS will still be able to open, display and use the data. It will >> however not be able to automatically align it properly with other datasets >> that are using other coordinate systems. It will also not be able to >> calculate distances and surfaces. For all this, the user needs to manually >> define the coordinate system. >> >> I would assume that this isn't a problem for advanced GIS users (like >> MapAction) but it can be confusing for people who don't know so much about >> those things. >> >> I would also assume (but needs to be tested) that an ArcGIS-compatible >> prj file would then create problems for Qgis. >> >> Stéphane >> >> -- >> "Le mot progrès n'aura aucun sens tant qu'il y aura des enfants >> malheureux" -- Albert Einstein >> >> "A journey does not need reasons. Before long, it proves to be reason >> enough in itself. One thinks that one is going to make a journey, yet soon >> it is the journey that makes or unmakes you." -- Nicolas Bouvier >> >> Photos de voyages, photos de montagne: http://www.henriod.info >> >> >> On Thu, Apr 18, 2013 at 9:45 AM, maning sambale < >> [email protected]> wrote: >> >>> I agree with Stéphane. This the same issue reported by MapAction when >>> I provided them shapefiles from the HOT export tool. Although they >>> didn't mention what ArcGIS version was used. >>> >>> On Thu, Apr 18, 2013 at 3:41 PM, Stéphane Henriod <[email protected]> >>> wrote: >>> > Hi Kate, >>> > >>> > I have quickly checked this export >>> http://hot-export.geofabrik.de/jobs/2755 >>> > on ArcGIS 10.1 and couldn't find any major issue. Do you remember what >>> bugs >>> > were mentioned? Then I can look further into this particular direction. >>> > >>> > The only thing is that ArcGIS doesn't recognize the coordinate system >>> > (Pseudo-Mercator) and it needs to be defined manually. It's not a >>> problem >>> > with the Export tool, however. I think the confusion comes from the >>> > coordinate system itself, because its definition is slightly different >>> in >>> > ArcGIS. >>> > >>> > prj file from the HOT Export: >>> > PROJCS["WGS 84 / Pseudo-Mercator",GEOGCS["Popular Visualisation >>> > CRS",DATUM["Popular_Visualisation_Datum",SPHEROID["Popular >>> Visualisation >>> > >>> Sphere",6378137,0,AUTHORITY["EPSG","7059"]],TOWGS84[0,0,0,0,0,0,0],AUTHORITY["EPSG","6055"]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.01745329251994328,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4055"]],UNIT["metre",1,AUTHORITY["EPSG","9001"]],PROJECTION["Mercator_1SP"],PARAMETER["central_meridian",0],PARAMETER["scale_factor",1],PARAMETER["false_easting",0],PARAMETER["false_northing",0],AUTHORITY["EPSG","3785"],AXIS["X",EAST],AXIS["Y",NORTH]] >>> > >>> > prj file from ArcGIS: >>> > >>> PROJCS["WGS_1984_Web_Mercator_Auxiliary_Sphere",GEOGCS["GCS_WGS_1984",DATUM["D_WGS_1984",SPHEROID["WGS_1984",6378137.0,298.257223563]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]],PROJECTION["Mercator_Auxiliary_Sphere"],PARAMETER["False_Easting",0.0],PARAMETER["False_Northing",0.0],PARAMETER["Central_Meridian",0.0],PARAMETER["Standard_Parallel_1",0.0],PARAMETER["Auxiliary_Sphere_Type",0.0],UNIT["Meter",1.0]] >>> > >>> > One workaround would be for the export tool to output unprojected >>> layers >>> > (WGS84). Then anyone can project it into any coordinate system so that >>> > distance and surface calculations are correct. >>> > >>> > Cheers >>> > >>> > Stéphane >>> > >>> > -- >>> > "Le mot progrès n'aura aucun sens tant qu'il y aura des enfants >>> malheureux" >>> > -- Albert Einstein >>> > >>> > "A journey does not need reasons. Before long, it proves to be reason >>> enough >>> > in itself. One thinks that one is going to make a journey, yet soon it >>> is >>> > the journey that makes or unmakes you." -- Nicolas Bouvier >>> > >>> > Photos de voyages, photos de montagne: http://www.henriod.info >>> > >>> > >>> > On Thu, Apr 18, 2013 at 6:39 AM, Kate Chapman <[email protected]> >>> wrote: >>> >> >>> >> Hi All, >>> >> >>> >> Occasionally I hear about bugs in using the data retrieved from the >>> >> HOT Export tool (http://hot-export.geofabrik.de/). These are >>> primarily >>> >> from ArcGIS users. >>> >> >>> >> Personally I don't run Windows, nor do I have access to ArcGIS so I >>> can't >>> >> check. >>> >> >>> >> Do we have any ArcGIS users on the list that could spend some time >>> >> using the Export tool and looking for issues? >>> >> >>> >> Thanks, >>> >> >>> >> -Kate >>> >> >>> >> _______________________________________________ >>> >> HOT mailing list >>> >> [email protected] >>> >> http://lists.openstreetmap.org/listinfo/hot >>> > >>> > >>> > >>> > _______________________________________________ >>> > HOT mailing list >>> > [email protected] >>> > http://lists.openstreetmap.org/listinfo/hot >>> > >>> >>> >>> >>> -- >>> cheers, >>> maning >>> ------------------------------------------------------ >>> "Freedom is still the most radical idea of all" -N.Branden >>> wiki: http://esambale.wikispaces.com/ >>> blog: http://epsg4253.wordpress.com/ >>> ------------------------------------------------------ >>> >>> >> > > _______________________________________________ > HOT mailing list > [email protected] > http://lists.openstreetmap.org/listinfo/hot > >
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