Details Ticket 1568


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Serial Number 1568
Subject display across 180 meridian
Area bug
Queue grass
Requestors b.wood@niwa.co.nz
Owner egmiller
Status resolved
Last User Contact Mon Mar 31 09:28:38 2003 (5 yr ago)
Current Priority 70
Final Priority 70
Due No date assigned
Last Action Mon Mar 31 09:28:38 2003 (5 yr ago)
Created Mon Feb 3 22:41:58 2003 (6 yr ago)

Transaction History Ticket 1568


Mon, Feb 3 2003 22:41:58    Request created by guest  
Subject: display across 180 meridian

Platform: GNU/Linux/i386
grass binary for platform: Compiled from Sources
GRASS Version: 5.0.0 Aug 2002


I've flagged this as critical, because it is to me. Not to many others though.
I'm recording it as a bug, although it may be my ignorance of GRASS which is
the real problem.


I have some seabed contours & some point (site) data east of New Zealand, covering
both sides of the 180 deg meridian.

I set the region to 

ellipsoid:  wgs84
north:      42:16:48S
south:      45:07:40.8S
west:       172:02:45.6E
east:       172:50:02.4W

The point data (ascii xyz imported into sites) has x values of -160 to 190 (where
190 = -170 = 170W). GRASS only displays the data (in the monitor) in the Eastern
(<180) hemisphere (west side of the map). Converting the sites to vectors allows
all the points to display, both sides of 180.

Similarly, the vector contours (imported from a shapefile in mercator & reprojected
to lat long) display fine in the monitor.

I have converted the contours to a raster (v.surf.rst) but the resulting raster
map doesn't all display (just the base color of the minimum value) any cells
east of 180.

Much of my work involves data crossing the 180 meridian using lat/long, so this
functionality is critical for my use of GRASS.

If this is not a bug, is there a way to work with lat/long data/maps (site, raster/vector)
seamlessly across 180?


Appreciated,

  Brent Wood 
Tue, Feb 4 2003 05:54:12    Mail sent by egm2@jps.net  
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Date Mon, 3 Feb 2003 20:54:01 -0800
From "Eric G. Miller" <egm2@jps.net>
To Request Tracker <grass-bugs@intevation.de>
Cc grass5@grass.itc.it
Subject Re: [GRASS5] [bug #1568] (grass) display across 180 meridian
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d.sites should be fixed in GRASS 5.0 HEAD.  For reference, the relevant
programs need to call G_adjust_easting (easting, window) to fix up the
coordinate (dang wrap around!).

-- 
echo ">gra.fcw@2ztr< eryyvZ .T pveR" | rot13 | reverse


Mon, Mar 31 2003 09:26:24    Taken by egmiller  
Mon, Mar 31 2003 09:28:38    Status changed to resolved by egmiller  
Mon, Mar 31 2003 09:28:38    Mail sent by egmiller  
I believe this problem is solved in the HEAD branch of CVS for 5.0.
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