grdcontour:

[Kristof Koch]

Dear List,

I'm trying to plot a single contour line. What unit is used here when the original data (comfix-limit.txt) for generating grddist.nc is a list of coordinates? I expected degrees but only got tiny little blobs on the resulting plot. The result I'm after is a contour line 300NM away from the coordinates given in comfix-limit.txt. As you can see I tried it with "5" as there are 60NM in 1° => 300NM.

grdmath -Rd -I0.1 -fg $WORK_DIR/comfix-limit.txt PDIST = "$STORAGE_DIR"/grddist.nc

grdcontour \
$STORAGE_DIR/grddist.nc \
-J -R \
-A+5+lVHF-Coverage+v+f6p,BellCentennialStd-NameNum,red \
-Wa1.5p,red,1.5_1:0p \
-K -O \

$FILE

Any ideas what I'm doing wrong? The docs say: "[…] annotation interval [is] in data units […]". Running gmt 5.2.0_r13126 [64-bit]

All the best,
Kristof

--
My PGP Public Key: http://kristofkoch.de/pgp/


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[Eduardo A. Suárez]

Hi Kristof,

Post by Kristof Koch
Dear List,
I'm trying to plot a single contour line. What unit is used here
when the original data (comfix-limit.txt) for generating grddist.nc
is a list of coordinates? I expected degrees but only got tiny
little blobs on the resulting plot.

PDIST output is in Km, if -fg is used as in your example.

Eduardo.-
--
Eduardo A. Suarez
Facultad de Ciencias Astronómicas y Geofísicas - UNLP
FCAG: [phone] int. 172/Cel: (0221)-15-4557542/Casa: [phone]


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[Kristof Koch]

Hi Eduardo,

Post by Eduardo A. Suárez
Hi Kristof,
PDIST output is in Km, if -fg is used as in your example.

thank you for pointing this out. I've somehow overlooked this. I found it well hidden in http://gmt.soest.hawaii.edu/doc/latest/grdmath.html#notes-on-operators after your hint. So 300*1.852 it is for me.

Thank you for your help!
Kristof

--
My PGP Public Key: http://kristofkoch.de/pgp/


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