[GRASS-user] Re: How to draw the earthquake-magtintude map...

[sgw00412 at nifty.com]

Dear all,

I wish to express my gratitude to your some advices. 

I understood the command that drew in circle. 
Also, I understood the magnitude was not simple.

It explains the process...:

(1)
d.vect.thematic map=quake column=mag type=point themetype=graduated_points ico
n=basic/circle

...It succeeded.

(2)
d.vect map=quake size_column=mag icon=basic/circle
...error message "Sorry, <size_column> is not a valid parameter"

(3)
d.vect map=quake size=mag icon=basic/circle
...It succeeded. but very small symbolsize...

(4)
d.vect map=quake size=10^(11+1.5*mag) icon=basic/circle
...error message "token (' syntax error..."... 
Why ?

(5)
d.vect map=quake size=10^mag icon=basic/circle
...It succeeded.

----
Yasuo shimada ( Japan weather association )


----- Original Message -----
>Date: Wed, 15 Jun 2011 16:46:28 +0900 (JST)
>From: sgw00412 at nifty.com
>To: grass-user at lists.osgeo.org
>Subject: How to draw the earthquake-magtintude map...
>
>
>Dear grass users
>
>I'm from Japan and begginer user of grass GIS.
>
>I tried to draw earthquake map of tohoku Japan.
>
>First, I summarized of some earthquake data, for example lat, lon, depth and 
m
>agnitude.
>
>---------------------------------
>lon     lat    depth Magnitude
>---------------------------------
>139.9,  37.7,  10,  3.1
>141.0,  35.8,  10,  2.6
>142.7,  40.8,  20,  4.4
>...
>---------------------------------
>
>Second, this text data was imported to grass data by using v.in.ascii, as fol
l
>ows;
>
>cat data.txt | v.in.ascii fs=',' cat=0 x=1 y=2 out=quake columns='x double pr
e
>cision, y double precision, depth integer,  mag double precision'
>
>So, I typed to 'v.vect quake'
>These points where the earthquake were displayed by cross (x) .
>
>Next, I tried to display new map as circle size of earthquake-magnitude.
>
>v.vect quake size=magnitude
>
>However, unsuccessful....What should I do?
>
>Yasuo shimada ( Japan weathere association )