[Qgis-user] KML to GoogleEarth

Thu Jul 28 03:16:22 PDT 2011

Hi Walter,
I'm not sure what your understanding of qgis is but it deals with
pretty much every projection you can throw at it and the project
projection/CRS shouldn't really cause any issues if all the
projections are set correctly and the translations are working.

Project CRS: the projection you'll see displayed on the map on the screen.

Layer/item CRS: with on the fly reprojection enabled you can load a
file with pretty much any projection and QGIS will reproject the data
as required, it won't change the projection of the file you've loaded
the and if you want to reproject it permanently you'll need to go the
"save as" route and tell it what projection you want it to save the
new file in. When you create a new vector layer you have the option to
create it in the project or any other CRS.

eg: You're able to load a file with CRS "A" into a project with CRS
"B" then load another file with CRS "C" and save the file that's CRS
"A" as CRS "D".

The disadvantage to the flexibility of all of this is that
occasionally QGIS won't find the CRS or the projection file or you'll
get confused as to which CRS the file/layer your working in.

The point to what I'm saying is that you shouldn't need to create a
new project or worry too much about the default CRS if what you want
to do is reproject the vector files so they're compatible with GE. You
do need to know what the CRS of the in and out files are though.

If you're able to send me through a small file as an example to show
what you want to do I can have a look.

Regards
Matt

On Thu, Jul 28, 2011 at 5:41 PM, Walter Ludwick <wludwick at mac.com> wrote:
> Hey, Percy: That's a good idea about the GPS exchange format (i had
> forgotten that GE reads GPX, tho i have used it for mapping trails exported
> from my GPS in the past). Unfortunately it doesn't work for polygon data (as
> contained in this zoning map that is the layer i want to export), per the
> following error msg:
> Export to vector file failed.
> Error: creation of layer failed (OGR error:Geometry type of `Polygon' not
> supported in GPX.
> )
> As to Giovanni's suggestion: it makes sense, so i have changed the CRS
> default at a global level to this:
>             +proj=longlat +ellps=WGS84 +datum=WGS84 +no_defs
> ,but that only works on whatever new layers i may create, the dialog says.
> So, since QGIS can't do the xlation for me on export (i.e. Layer -> "save
> as" KML, with WGS84 set for CRS), i guess i will have to go back to sources
> and reload all my data into new layers with the CRS reset to WGS84. This
> could take some time, but it does give me a way forward, at least.
> Thanks for all your help, folks!        /w
>
> On Jul 27, 2011, at 2:46 PM, percy langa wrote:
>
> Works for me >> Qgis 1.6 >> CRS: WGS84, EPSG:4326, 3452
> Also try saving to GPS exchange format, then open in google earth.
> Cheers!
> Percy
>
> On Wed, Jul 27, 2011 at 3:07 PM, Giovanni Manghi <giovanni.manghi at gmail.com>
> wrote:
>>
>> Tha  probably your shapefile is missing the .prj file, so when you load
>> it into QGIS it will probably be given the wrong CRS. Change it manually
>> then try again "save as..." and export in WGS84.
>>
>> cheers
>>
>> -- Giovanni --
>>
>> On Wed, 2011-07-27 at 13:13 +0100, Walter Ludwick wrote:
>> > Hey, Saber: Thanks for the quick reply and explicit instructions.
>> >
>> > It was easy to do, i gave it a try -but still the same condition
>> > results, alas (i.e. the KML saved, even using that WGS84 as CRS, is
>> > interpreted by Google Earth as a set of polygons that covers the entire
>> > globe).
>> >
>> > I'm going to keep flailing, trying whatever other CRS seems likely, but
>> > if there be any further ideas of things i might try, please don't hesitate
>> > to suggest!
>> >
>> > /w
>> >
>> >
>> > On Jul 27, 2011, at 12:29 PM, Saber Razmjooei wrote:
>> >
>> > > The CRS you need is EPSG:4326
>> > > To find it easily, in search section change Authority to EPSG and
>> > > search
>> > > for ID.
>> > > Type 4326 and highlight the line from Coordinate Reference System:
>> > > WGS84   EPSG:4326     3452
>> > > Click OK.
>> > >
>> > >
>> > >
>> > >> As a complete n00b to this list -also very new to QGIS and GIS in
>> > >> general-
>> > >> i am having a problem that is i hope trivial to solve, for one of you
>> > >> with
>> > >> more experience!
>> > >>
>> > >> Essentially: to take a (vector) layer from QGIS and "save as..." KML,
>> > >> if i
>> > >> pass that dialog with defaults selected, i get a .KML file that
>> > >> doesn't
>> > >> make much sense to Google Earth -that is to say, Google Earth can
>> > >> read and
>> > >> will display the polygons, perhaps even in the right shape, tho i
>> > >> cannot
>> > >> be sure about that, because they display as lines that pretty much
>> > >> cover
>> > >> the entire globe!
>> > >>
>> > >> The one thing i can see that i think might be related to this problem
>> > >> is,
>> > >> the CRS (Co-ordinate Reference System) parameter, which appears in
>> > >> the
>> > >> "Save as..." dialog box with "Original CRS" as the default
>> > >> parameter...
>> > >> but then when i push the "browse" button, i am faced with an immense
>> > >> number of possibilities from which to choose, about which i have no
>> > >> idea.
>> > >>
>> > >> Can anyone shed some light, and perhaps suggest a CRS that just might
>> > >> work? The geography i am trying to describe is in coastal Portugal,
>> > >> if
>> > >> that makes any difference...       /w
>> > >>
>> > >>
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>> > >
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