[Proj] Standard projection for Mediterranean basin
ndzinn at comcast.net
Sun Feb 14 14:21:23 EST 2010
As a rule of thumb choose your standard parallels one sixth of the distance
inside the North and South boundaries of your area of interest. -Noel
From: proj-bounces at lists.maptools.org
[mailto:proj-bounces at lists.maptools.org] On Behalf Of Luigi Ponti
Sent: Sunday, February 14, 2010 12:44 PM
To: geraldi.evenden at gmail.com; PROJ.4 and general Projections Discussions
Subject: Re: [Proj] Standard projection for Mediterranean basin
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
shown a need to match any existing projection I would, because of the
E-W shape of your region, select Albers Equal Area conic. With reasonably
selected parallels is should give you less distortion at the extremities
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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