I have been using the vvinit/vvectr combo to produce vector maps of NOAA
wind data sets. The data set has vector speed (m/s) and angles
(degrees). I made a dummy data set that provided vectors in a constant
change of direction from 000-360 and the results are not 000-360. For
instance the portion from 000-035 looks more like 000-090 degrees. A 5
degree change looks like 30 degrees in change on the plot.
Odd thing about it the 0-90-180-270 arrows are in the right directions
but the amounts in-between are greatly exaggerated.
I have set PLR to 1 prior to making the vvinit call. In all other
aspects the plot looks correct.
Below is an excerpt of my call to vector plot.
c********Set up vectors
c CALL VVRSET
CALL SET (.1,.95,.20,.90,00.,25.,0.0,wtop,1)
CALL VVSETI ('SET - DO-SET-CALL-FLAG',0)
CALL VVSETR ('XC1 - X COORDINATE AT INDEX 1',1.)
CALL VVSETR ('XCM - X COORDINATE AT INDEX M',24.)
CALL VVSETR ('YC1 - Y COORDINATE AT INDEX 1',wbot)
CALL VVSETR ('YCN - Y COORDINATE AT INDEX N',wtop)
c********PLR 1= U ARRAY IN VECTOR MAG, V ARRAY IN < DEGREES
CALL VVSETI ('PLR - POLAR INPUT MODE',1)
CALL VVSETI ('AST - ARROW STYLE',1)
CALL VVSETI ('SVF - SPECIAL VALUE FLAG',3)
CALL VVSETR ('USV - SPECIAL VALUE',999.9)
CALL VVSETR ('VSV - SPECIAL VALUE',999.)
CALL VVINIT (ms,LX,angle,LX,ZDAT,LX,LX,23,WRK,0)
CALL VVSETR ('VRM - VECT REF MAG',20.)
CALL VVSETC ('MNT - MIN VECT REF','Reference Low Vector')
CALL VVSETC ('MXT - MAX VECT REF','Reference High Vector')
c********call to move the min-max text for wind barbs
CAll VVSETR ('MNX - MIN VECTOR TEXT BLOCK X CORD',.4)
CALL VVSETR ('MNY - MIN VECTOR TEXT BLOCK Y CORD',-.06)
CALL VVSETR ('MXX - MAX VECTOR TEXT BLOCK X CORD',.5)
CALL VVSETR ('MXY - MAX VECTOR TEXT BLOCK Y CORD',-.06)
CALL VVECTR (ms,angle,IDM,IDM,IDM,IDM)
CALL LABMOD ('(F5.0)','(F5.3)',0,0,0,0,0,0,0)
CALL GRIDAL (5,0,37,0,1,1,5,10.,0.)
CALL SET (0.,1.,0.,1.,0.,1.,0.,1.,1)
CALL WTSTR (.4,.95,station,2,0.,0.)
CALL WTSTR (.5,.95,date(I,J-2),2,0.,0.)
CALL PLCHHQ (.03,.6,'HEIGHT IN KILOMETERS',.012,90.,0.)
CALL PLCHHQ (.5,.1,'TIME OF DAY (PST) HOUR 1-24',.012,0.,0.)
CALL FRAME
-- Kevin Rosser Environmental Planner Tehama County, CA_______________________________________________ ncarg-talk mailing list ncarg-talk AT unknown http://mailman.ucar.edu/mailman/listinfo/ncarg-talk
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