[GRASS-user] Reprojection from LLC to UTM (various zones)

[Miriam España]

Hello again,

ok, I understand that it's not the appropriate projection for the zone, but
it's part of my problem: my objective it's to visualize a raster3d in nviz,
but the r3 map it's in Lambert Conic conformal, and it  seems like Nviz
can't represent maps in locations differents from XY or UTM (respect UTM,
I'm not sure, anybody can confirm this?).

It's for this reason... any suggestion?

Thanks for all,

Miriam 


Michael Barton wrote:
> 
> A UTM projection is not really appropriate for all of North America, which
> crosses multiple UTM zones. It is only accurate within a single zone. Try
> a
> different projection that is appropriate for such large areas (e.g.,
> Lambert
> Conformal Conic).
> 
> Michael
> 
> 
> On 8/23/07 2:01 AM, "Miriam E. A." <mespana at ugr.es> wrote:
> 
>> 
>> Hello everybody,
>> 
>> I'm triying to reproject a map of north america form llc to utm, but
>> Grass
>> reports an error about input map is outside output region.
>> 
>> I choose zone 16N as center of the map, defining a region as the next, in
>> the UTM Location:
>> 
>> GRASS 6.3.cvs (UTM):~ > g.proj -p
>> -PROJ_INFO-------------------------------------------------
>> name       : UTM
>> datum      : nad27
>> towgs84    : -22.000,157.000,176.000
>> proj       : utm
>> ellps      : clark66
>> a          : 6378206.4000000004
>> es         : 0.0067686580
>> f          : 294.9786982000
>> zone       : 16
>> -PROJ_UNITS------------------------------------------------
>> unit       : meter
>> units      : meters
>> meters     : 1.0
>> 
>> g.region n=10000000 s=0 e=10000000 w=0
>> 
>> to cover the greatest area possible.
>> 
>> Does grass support regions crossing various zones UTM? And, UTM considers
>> north as 0 to avoid negative coords in the north hemisphere, but in GRASS
>> south must be 0...
>> 
>> Maybe i'm very wrong.
>> 
>> Thanks for your attention and for the help (in this and previous emails
>> and irc).
>> 
>> Miriam
> 
> __________________________________________
> Michael Barton, Professor of Anthropology
> Director of Graduate Studies
> School of Human Evolution & Social Change
> Center for Social Dynamics & Complexity
> Arizona State University
> 
> phone: 480-965-6213
> fax: 480-965-7671
> www: http://www.public.asu.edu/~cmbarton
> 
> 
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> 

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