[HOT] Access to ArcGIS and Testing the HOT Export Tool

Thu Apr 18 14:00:30 UTC 2013

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 <kate at maploser.com> 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 <s at henriod.info> 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 <
>> emmanuel.sambale at gmail.com> 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 <s at henriod.info>
>>> 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 <kate at maploser.com>
>>> 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
>>> >>
>>> >> _______________________________________________
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>>> >> HOT at openstreetmap.org
>>> >> http://lists.openstreetmap.org/listinfo/hot
>>> >
>>> >
>>> >
>>> > _______________________________________________
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>>> > HOT at openstreetmap.org
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>>> >
>>>
>>>
>>>
>>> --
>>> cheers,
>>> maning
>>> ------------------------------------------------------
>>> "Freedom is still the most radical idea of all" -N.Branden
>>> wiki: http://esambale.wikispaces.com/
>>> blog: http://epsg4253.wordpress.com/
>>> ------------------------------------------------------
>>>
>>>
>>
>
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