grdvector with GMT5

Langlois <[email protected]>
Newsgroups gmane.comp.gis.gmt.user
Message-ID <[email protected]>
Hello,

I’m getting trouble with grdvector use with GMT5.1.0 :
I have two scripts with the same grdvector command to draw Nuvel-1 velocity vectors, one for a regional map, the other for a global map (attached). But the output maps look completely differents (see attached images) and I don’t undersand why.

My grdvector command is, for both map :
 
# add vector field
vecsize=0.25+e+p0.25p
velscale=i80

#Nuvel-1A
gmt grdvector $rasterpath/plates/nuvel1.vy.1.5.grd $rasterpath/plates/nuvel1.vx.1.5.grd \
 	 -T $region $projection -I30 -S$velscale -Q$vecsize \
 	 -Wthick,black -Gorange --MAP_VECTOR_SHAPE=0.5 -O -K -V >> $carte

where "$rasterpath/plates/nuvel1.vy.1.5.grd » is the Nuvel-1 velocity grid (x and y components). Only the -I option are changed (-I30 for the global map, -I5 for the regional one).

How can the same script command gives so different results ?? Both scripts are also attached below.
Thanks for help,

Cyril







Dr. Cyril LANGLOIS
Professeur agrégé - enseignant de Sciences de la Terre 
[email protected]
Tél. portable : 06 89 05 68 22
Tél. bureau : 04 72 72 85 28
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Préparation à l'Agrégation SV-STU
Ecole Normale Supérieure de Lyon -  Site Monod
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