[Proj] Standard projection for Mediterranean basin
lponti at infinito.it
Sun Feb 14 13:43:56 EST 2010
On 20:59, Gerald I. Evenden wrote:
> On Saturday 13 February 2010 12:28:57 pm Luigi Ponti wrote:
>> I use PROJ.4 via GRASS GIS, and I would like to know if anyone is aware
>> of a standard projection for mapping the whole Mediterranean basin. I
>> need to do raster-based statistics on the maps, so I guess what I am
>> looking for is an equal area projection.
>> What I have found on the Web is a GIS built by the Joint Research Center
>> (JRC http://www.jrc.ec.europa.eu/) that used Lambert Azimuthal Equal
>> Area (LAEA) for the Mediterranean:
>> However, it adopted the same projection center for both Europe and the
>> Mediterranean (0 °E and 48 °N). Is this correct?
>> There is also a workshop report
>> that recommended LAEA with projection center 9 °E and 53 °N to be used
>> for statistical mapping in the European Union.
>> Based on this background it seems like LAEA would be fine. However, I am
>> unsure if there is a standard projection center and datum.
>> Thank you for any hints. Kind regards,
>> Proj mailing list
>> Proj at lists.maptools.org
> Personal opinion: because you seem to have your own project needs that has not
> shown a need to match any existing projection I would, because of the general
> E-W shape of your region, select Albers Equal Area conic. With reasonably
> selected parallels is should give you less distortion at the extremities than
> the azimuthal projection.
Thank you -- this sounds like a very good suggestion.
> A little parameter tuning needs to be done.
Really have no clue on how to go about this, but will give it a try.
From what you say, I understand that it would basically be a matter of
finding the right standard parallels: is there a rule of thumb for this?
> I would not be prejudiced by projections where the needs to cover the entire
> continent are are the primary consideration.
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