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@nifty.com
To: grass-user@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 )