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<div class="moz-cite-prefix">On 20-03-17 13:30, Martin wrote:<br>
</div>
<blockquote type="cite"
cite="mid:e8c4ba0b-2171-8181-d0f3-f343962223e6@inventati.org">
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<p>Thank you very much. I tried this suggestion and it works
perfectly! Forgive my ignorance, but how did you know that
'+proj=igh' would produce the correct result? I understand that
igh means Interrupted Goode Homolosine, but where did you find
this information (this is for my education)?</p>
</blockquote>
See the link Raymond gave you, <a class="moz-txt-link-freetext"
href="http://proj4.org/projections/igh.html">http://proj4.org/projections/igh.html</a>.
<blockquote type="cite"
cite="mid:e8c4ba0b-2171-8181-d0f3-f343962223e6@inventati.org">
<p>I am going to write to WWF and suggest that they make the
grasslands shape file available in WGS84 (i.e. EPSG 4326), as I
would like to direct others to it without the need for providing
an explanation of how to transform the data.</p>
</blockquote>
Yes, that is a good idea. <br>
<blockquote type="cite"
cite="mid:e8c4ba0b-2171-8181-d0f3-f343962223e6@inventati.org">
<p>I discovered that ArcGIS understands the Interrupted Goode
Homolosine CRS. A friend with ArcGIS has now converted it to
EPSG 4326 for me and this also works fine and produces the same
result as your excellent suggestion.</p>
<p>Ciao, Martin<br>
</p>
<br>
<div class="moz-cite-prefix">On 20/03/17 07:54, Paulo van Breugel
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:9bbb70c8-0427-6b5c-c003-f5d6f7057638@gmail.com">
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charset=utf-8">
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px;
margin-right:0px; -qt-block-indent:0; text-indent:0px;">Using
the definition on the proj4 page, you can define a custom CRS
(settings --> custom crs). Just fill in under parameters
'+proj=igh'. I just tried and it gives a good match<br>
</p>
<br>
Note that this grassland layer is based on the terrestrial
ecoregional map of WWF [1]. If you over overlay that on your
grassland layer, using for the latter the Interrupted Goode
Homolosine CRS, you see they will overlap perfectly. You could
in fact easily recreate the map using the ecoregional map.<br>
<br>
Cheers,<br>
<br>
Paulo<br>
<br>
[1]<a
href="https://www.worldwildlife.org/publications/terrestrial-ecoregions-of-the-world"
title="https://www.worldwildlife.org/publications/terrestrial-ecoregions-of-the-world"
class="https" moz-do-not-send="true">
https://www.worldwildlife.org/publications/terrestrial-ecoregions-of-the-world</a><br>
<br>
<br>
<div class="moz-cite-prefix">On 20-03-17 07:46, Martin wrote:<br>
</div>
<blockquote type="cite"
cite="mid:7efdbb43-8b22-dfba-1580-f91a04eae5da@inventati.org">Many
thanks Raymond: that is helpful. Now at least I know what the
projection is! As QGIS has so many projections it never
occurred to me that there may be one that it didn't include. I
will now see if there is some other way - outside QGIS
perhaps? - to convert this projection into something more
friendly (so to speak). <br>
<br>
Martin <br>
<br>
<br>
<br>
On 19/03/17 21:30, Raymond Nijssen wrote: <br>
<blockquote type="cite">Hi Martin, <br>
<br>
Sorry, I cannot really help you. <br>
<br>
Your data seems to be in the (quite odd for distributing
data) projection: <br>
<a class="moz-txt-link-freetext"
href="https://en.wikipedia.org/wiki/Goode_homolosine_projection"
moz-do-not-send="true">https://en.wikipedia.org/wiki/Goode_homolosine_projection</a>
<br>
<br>
And it is not recognized by qgis. <br>
<br>
Proj4 seems to know it though: <br>
<a class="moz-txt-link-freetext"
href="http://proj4.org/projections/igh.html"
moz-do-not-send="true">http://proj4.org/projections/igh.html</a>
<br>
<br>
And I found this: <br>
<a class="moz-txt-link-freetext"
href="http://gis.stackexchange.com/questions/17263/is-it-possible-to-use-the-goode-homolosine-projection-in-qgis"
moz-do-not-send="true">http://gis.stackexchange.com/questions/17263/is-it-possible-to-use-the-goode-homolosine-projection-in-qgis</a>
<br>
<br>
Hope it helps (a bit), <br>
Raymond <br>
<br>
<br>
On 19-03-17 20:49, Martin wrote: <br>
<blockquote type="cite">Hello folks! <br>
<br>
I would like to plot a simple map of the WWF World
Grassland Types (the <br>
shape file is available at <br>
<a class="moz-txt-link-freetext"
href="https://www.worldwildlife.org/publications/world-grassland-types"
moz-do-not-send="true">https://www.worldwildlife.org/publications/world-grassland-types</a>
<br>
<br>
It is in an unusual projection. The .prj file is: <br>
<br>
PROJCS["World_Goode_Homolosine_Land",GEOGCS["GCS_WGS_1984",DATUM <br>
["D_WGS_1984",SPHEROID["WGS_1984",6378137.0,298.257223563]],PRIMEM <br>
"Greenwich",0.0],UNIT["Degree",0.0174532925199433]],PROJECTION <br>
["Goode_Homolosine"],PARAMETER["False_Easting",0.0],PARAMETER <br>
["False_Northing",0.0],PARAMETER["Central_Meridian",0.0],PARAMETER <br>
["Option",1.0],UNIT["Meter",1.0]] <br>
<br>
The map does not include the outline countries of the
world and <br>
therefore I would like to add these (perhaps the
NaturalEarth 110 <br>
million scale country shape file, which is in WGS84). <br>
<br>
However, I cannot figure out how to align the grassland
layer and the <br>
110 million NaturalEarth layer. As I understand it, I
should use Save As <br>
to reproject the grassland shape file with a new CRS
(perhaps Mercator). <br>
With Enable on the fly CRS transformation enabled I should
then be able <br>
to put the two shape files together - but I am darned if I
can obtain <br>
anything sensible: I cannot get the two layers to align in
any way. <br>
<br>
With grateful thanks for any help, Martin <br>
<br>
<br>
<br>
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