[Proj] Clark 66 projection help

Paul Ramsey pramsey at refractions.net
Thu Mar 16 16:12:16 EST 2006


equivalent to

+proj=utm +zone=10 +ellps=clrk66 +datum=NAD27 +units=m

On Mar 16, 2006, at 10:49 AM, mike d'ambrogia wrote:

> All,
> New to the GIS world but having fun so far (not that being new to GIS
> shouldn't be fun...).  I've hit my first roadblock on a project  
> that I'm
> trying to move over to mapserver and looking for some help.
> This is an arcview project that I'm trying to convert to mapserver for
> the Forest Service here in Central Calif so I'm dealing with NAD27 and
> clark 66 which are apparently favorites of all.  The map raster images
> that I have span from UTM 10 into UTM 11 but interstingly they use  
> UTM10
> values even if the area in question is within UTM11.   This leaves me
> with some really big easting values for some areas on the map, never
> seen this before.  I'm wondering how the projection for that would be
> different, if at all?
> The arcview prj files show the following:
> PROJCS["NAD_1927_UTM_Zone_10N",GEOGCS 
> ["GCS_North_American_1927",DATUM["D
> _North_American_1927",SPHEROID["Clarke_1866", 
> 6378206.4,294.9786982]],PRI
> MEM["Greenwich",0],UNIT["Degree",0.017453292519943295]],PROJECTION 
> ["Tran
> sverse_Mercator"],PARAMETER["False_Easting",500000],PARAMETER 
> ["False_Nor
> thing",0],PARAMETER["Central_Meridian",-123],PARAMETER 
> ["Scale_Factor",0.
> 9996],PARAMETER["Latitude_Of_Origin",0],UNIT["Meter",1]]
> I can't find an epsg code that seems to match up well, but I may not
> know exactly what I am looking at either...
> I'm not sure where to go next with this, any suggestions on how to  
> come
> up with a valid proj.4 projection from the info above would be greatly
> appreicated.
> Mike
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