[Qgis-user] How to reproject maps of world grasslands

[Paulo van Breugel]

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


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.

Cheers,

Paulo

[1]https://www.worldwildlife.org/publications/terrestrial-ecoregions-of-the-world


On 20-03-17 07:46, Martin wrote:
> 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).
>
> Martin
>
>
>
> On 19/03/17 21:30, Raymond Nijssen wrote:
>> Hi Martin,
>>
>> Sorry, I cannot really help you.
>>
>> Your data seems to be in the (quite odd for distributing data) 
>> projection:
>> https://en.wikipedia.org/wiki/Goode_homolosine_projection
>>
>> And it is not recognized by qgis.
>>
>> Proj4 seems to know it though:
>> http://proj4.org/projections/igh.html
>>
>> And I found this:
>> http://gis.stackexchange.com/questions/17263/is-it-possible-to-use-the-goode-homolosine-projection-in-qgis 
>>
>>
>> Hope it helps (a bit),
>> Raymond
>>
>>
>> On 19-03-17 20:49, Martin wrote:
>>> Hello folks!
>>>
>>> I would like to plot a simple map of the WWF World Grassland Types (the
>>> shape file is available at
>>> https://www.worldwildlife.org/publications/world-grassland-types
>>>
>>> It is in an unusual projection. The .prj file is:
>>>
>>> PROJCS["World_Goode_Homolosine_Land",GEOGCS["GCS_WGS_1984",DATUM
>>> ["D_WGS_1984",SPHEROID["WGS_1984",6378137.0,298.257223563]],PRIMEM
>>> "Greenwich",0.0],UNIT["Degree",0.0174532925199433]],PROJECTION
>>> ["Goode_Homolosine"],PARAMETER["False_Easting",0.0],PARAMETER
>>> ["False_Northing",0.0],PARAMETER["Central_Meridian",0.0],PARAMETER
>>> ["Option",1.0],UNIT["Meter",1.0]]
>>>
>>> The map does not include the outline countries of the world and
>>> therefore I would like to add these (perhaps the NaturalEarth 110
>>> million scale country shape file, which is in WGS84).
>>>
>>> However, I cannot figure out how to align the grassland layer and the
>>> 110 million NaturalEarth layer. As I understand it, I should use 
>>> Save As
>>> to reproject the grassland shape file with a new CRS (perhaps 
>>> Mercator).
>>> With Enable on the fly CRS transformation enabled I should then be able
>>> to put the two shape files together - but I am darned if I can obtain
>>> anything sensible: I cannot get the two layers to align in any way.
>>>
>>> With grateful thanks for  any help, Martin
>>>
>>>
>>>
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