Well said Matt. My understanding is CRS could use a lot of improvement.<div><br></div><div>Cheers!<br><br><div class="gmail_quote">On Thu, Jul 28, 2011 at 12:16 PM, Matt Boyd <span dir="ltr"><<a href="mailto:mattslists@gmail.com">mattslists@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">Hi Walter,<br>
I'm not sure what your understanding of qgis is but it deals with<br>
pretty much every projection you can throw at it and the project<br>
projection/CRS shouldn't really cause any issues if all the<br>
projections are set correctly and the translations are working.<br>
<br>
Project CRS: the projection you'll see displayed on the map on the screen.<br>
<br>
Layer/item CRS: with on the fly reprojection enabled you can load a<br>
file with pretty much any projection and QGIS will reproject the data<br>
as required, it won't change the projection of the file you've loaded<br>
the and if you want to reproject it permanently you'll need to go the<br>
"save as" route and tell it what projection you want it to save the<br>
new file in. When you create a new vector layer you have the option to<br>
create it in the project or any other CRS.<br>
<br>
eg: You're able to load a file with CRS "A" into a project with CRS<br>
"B" then load another file with CRS "C" and save the file that's CRS<br>
"A" as CRS "D".<br>
<br>
The disadvantage to the flexibility of all of this is that<br>
occasionally QGIS won't find the CRS or the projection file or you'll<br>
get confused as to which CRS the file/layer your working in.<br>
<br>
The point to what I'm saying is that you shouldn't need to create a<br>
new project or worry too much about the default CRS if what you want<br>
to do is reproject the vector files so they're compatible with GE. You<br>
do need to know what the CRS of the in and out files are though.<br>
<br>
If you're able to send me through a small file as an example to show<br>
what you want to do I can have a look.<br>
<br>
Regards<br>
<font color="#888888">Matt<br>
</font><div><div></div><div class="h5"><br>
<br>
On Thu, Jul 28, 2011 at 5:41 PM, Walter Ludwick <<a href="mailto:wludwick@mac.com">wludwick@mac.com</a>> wrote:<br>
> Hey, Percy: That's a good idea about the GPS exchange format (i had<br>
> forgotten that GE reads GPX, tho i have used it for mapping trails exported<br>
> from my GPS in the past). Unfortunately it doesn't work for polygon data (as<br>
> contained in this zoning map that is the layer i want to export), per the<br>
> following error msg:<br>
> Export to vector file failed.<br>
> Error: creation of layer failed (OGR error:Geometry type of `Polygon' not<br>
> supported in GPX.<br>
> )<br>
> As to Giovanni's suggestion: it makes sense, so i have changed the CRS<br>
> default at a global level to this:<br>
> +proj=longlat +ellps=WGS84 +datum=WGS84 +no_defs<br>
> ,but that only works on whatever new layers i may create, the dialog says.<br>
> So, since QGIS can't do the xlation for me on export (i.e. Layer -> "save<br>
> as" KML, with WGS84 set for CRS), i guess i will have to go back to sources<br>
> and reload all my data into new layers with the CRS reset to WGS84. This<br>
> could take some time, but it does give me a way forward, at least.<br>
> Thanks for all your help, folks! /w<br>
><br>
> On Jul 27, 2011, at 2:46 PM, percy langa wrote:<br>
><br>
> Works for me >> Qgis 1.6 >> CRS: WGS84, EPSG:4326, 3452<br>
> Also try saving to GPS exchange format, then open in google earth.<br>
> Cheers!<br>
> Percy<br>
><br>
> On Wed, Jul 27, 2011 at 3:07 PM, Giovanni Manghi <<a href="mailto:giovanni.manghi@gmail.com">giovanni.manghi@gmail.com</a>><br>
> wrote:<br>
>><br>
>> Tha probably your shapefile is missing the .prj file, so when you load<br>
>> it into QGIS it will probably be given the wrong CRS. Change it manually<br>
>> then try again "save as..." and export in WGS84.<br>
>><br>
>> cheers<br>
>><br>
>> -- Giovanni --<br>
>><br>
>> On Wed, 2011-07-27 at 13:13 +0100, Walter Ludwick wrote:<br>
>> > Hey, Saber: Thanks for the quick reply and explicit instructions.<br>
>> ><br>
>> > It was easy to do, i gave it a try -but still the same condition<br>
>> > results, alas (i.e. the KML saved, even using that WGS84 as CRS, is<br>
>> > interpreted by Google Earth as a set of polygons that covers the entire<br>
>> > globe).<br>
>> ><br>
>> > I'm going to keep flailing, trying whatever other CRS seems likely, but<br>
>> > if there be any further ideas of things i might try, please don't hesitate<br>
>> > to suggest!<br>
>> ><br>
>> > /w<br>
>> ><br>
>> ><br>
>> > On Jul 27, 2011, at 12:29 PM, Saber Razmjooei wrote:<br>
>> ><br>
>> > > The CRS you need is EPSG:4326<br>
>> > > To find it easily, in search section change Authority to EPSG and<br>
>> > > search<br>
>> > > for ID.<br>
>> > > Type 4326 and highlight the line from Coordinate Reference System:<br>
>> > > WGS84 EPSG:4326 3452<br>
>> > > Click OK.<br>
>> > ><br>
>> > ><br>
>> > ><br>
>> > >> As a complete n00b to this list -also very new to QGIS and GIS in<br>
>> > >> general-<br>
>> > >> i am having a problem that is i hope trivial to solve, for one of you<br>
>> > >> with<br>
>> > >> more experience!<br>
>> > >><br>
>> > >> Essentially: to take a (vector) layer from QGIS and "save as..." KML,<br>
>> > >> if i<br>
>> > >> pass that dialog with defaults selected, i get a .KML file that<br>
>> > >> doesn't<br>
>> > >> make much sense to Google Earth -that is to say, Google Earth can<br>
>> > >> read and<br>
>> > >> will display the polygons, perhaps even in the right shape, tho i<br>
>> > >> cannot<br>
>> > >> be sure about that, because they display as lines that pretty much<br>
>> > >> cover<br>
>> > >> the entire globe!<br>
>> > >><br>
>> > >> The one thing i can see that i think might be related to this problem<br>
>> > >> is,<br>
>> > >> the CRS (Co-ordinate Reference System) parameter, which appears in<br>
>> > >> the<br>
>> > >> "Save as..." dialog box with "Original CRS" as the default<br>
>> > >> parameter...<br>
>> > >> but then when i push the "browse" button, i am faced with an immense<br>
>> > >> number of possibilities from which to choose, about which i have no<br>
>> > >> idea.<br>
>> > >><br>
>> > >> Can anyone shed some light, and perhaps suggest a CRS that just might<br>
>> > >> work? The geography i am trying to describe is in coastal Portugal,<br>
>> > >> if<br>
>> > >> that makes any difference... /w<br>
>> > >><br>
>> > >><br>
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</div></div></blockquote></div><br></div>