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<div class="moz-cite-prefix">On 20-03-17 08:54, Paulo van Breugel
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:9bbb70c8-0427-6b5c-c003-f5d6f7057638@gmail.com">
<meta http-equiv="Content-Type" content="text/html; 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>
</blockquote>
</blockquote>
</blockquote>
</blockquote>
Adding to my previous email: setting the project CRS to Interrupted
Goode Homolosine CRS and then opening this and other maps (with OTF
enabled) works. However, reprojecting the layer using save as (and
setting a new CRS) does not. I tried defining the CRS of the layer
and saved it under different name, setting the CRS to EPGS 4326, but
the resulting layer is completely distorted.<br>
<br>
<br>
<blockquote type="cite"
cite="mid:9bbb70c8-0427-6b5c-c003-f5d6f7057638@gmail.com">
<blockquote type="cite"
cite="mid:7efdbb43-8b22-dfba-1580-f91a04eae5da@inventati.org">
<blockquote type="cite">
<blockquote type="cite"> <br>
With grateful thanks for any help, Martin <br>
<br>
<br>
<br>
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