[Proj] Standard projection for Mediterranean basin

[Clifford J Mugnier]

>From 1925 to 1946, there was a "British Grid" used by the Allied Forces in the Mediterranean.  The British Army (GSGS) established the "Mediterranean Zone" for the secant Lambert Conical Orthomorphic Projection where the central meridian was 29° East of Greenwich, and the latitude of origin was 39° 30' N, the scale factor at origin was 0.99906, the False Easting was 900 km, and the False Northing was 600 km.  
 
See my column in PE&RS for December of 2002 on Greece.
 
Clifford J. Mugnier, C.P., C.M.S.
Past National Director (2006-2008),
Photogrammetric Applications Division
American Society for Photogrammetry and Remote Sensing 
and 
Chief of Geodesy,
Center for GeoInformatics
Department of Civil Engineering 
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LOUISIANA STATE UNIVERSITY 
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======================================================
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======================================================

________________________________

From: proj-bounces at lists.maptools.org on behalf of Noel Zinn
Sent: Sun 14-Feb-10 13:21
To: 'PROJ.4 and general Projections Discussions'
Subject: Re: [Proj] Standard projection for Mediterranean basin



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:
  

	Hello,
	 
	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:
	http://re.jrc.ec.europa.eu/pvgis/info/faq.htm#projection
	 
	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
	http://www.ec-gis.org/sdi/publist/pdfs/annoni-etal2003eur.pdf
	 
	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,
	 
	Luigi
	 
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	Proj mailing list
	Proj at lists.maptools.org
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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?

Thanks again,

Luigi




 
I would not be prejudiced by projections where the needs to cover the entire 
continent are are the primary consideration.
 
  

 

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