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<div class="moz-cite-prefix">Hello,<br>
<br>
you're correct, I typed in hurry.<br>
<br>
Regards all,<br>
Ivan<br>
<br>
<br>
On 09/19/2013 04:38 PM, Ricardo Hallak wrote:<br>
</div>
<blockquote
cite="mid:1937657686.5167797.1379601517734.JavaMail.root@iag.usp.br"
type="cite">
<style type="text/css">p { margin: 0; }</style>
<div style="font-family: times new roman,new york,times,serif;
font-size: 12pt; color: #000000">Hi,
<div>agreed, with exception that it should be:</div>
<div>size=sizeA1+sizeA2+sizeA3</div>
<div><br>
</div>
<div>since that A1, A2 and A3 are the weights.</div>
<div>Regards,</div>
<div>Ricardo<br>
<br>
<hr id="zwchr">
<blockquote style="border-left:2px solid rgb(16, 16,
255);margin-left:5px;padding-left:5px;color:#000;font-weight:normal;font-style:normal;text-decoration:none;font-family:Helvetica,Arial,sans-serif;font-size:12pt;"><b>De:
</b>"Bonan Antonino" <a class="moz-txt-link-rfc2396E" href="mailto:abonan@arpa.veneto.it"><abonan@arpa.veneto.it></a><br>
<b>Para: </b>"GrADS Users Forum"
<a class="moz-txt-link-rfc2396E" href="mailto:gradsusr@gradsusr.org"><gradsusr@gradsusr.org></a><br>
<b>Enviadas: </b>Quinta-feira, 19 de Setembro de 2013
5:52:40<br>
<b>Assunto: </b>Re: [gradsusr] Averaging over multiple
dimension ranges<br>
<br>
<style></style>
<div><font face="Arial" size="2">Maybe the correct formula
is</font></div>
<div> </div>
<div><font face="Arial" size="2"><font face="Times New
Roman" size="3">total average =
((averageA1*sizeA1)+(averageA2*sizeA2)+(averageA3*sizeA3))/(3*size)</font><br>
</font></div>
<div><font face="Arial" size="2">where</font></div>
<div> </div>
<div><font face="Arial" size="2">size = <font face="Times
New Roman" size="3">sizeA2 + sizeA2 + sizeA2</font></font></div>
<div> </div>
<div><font face="Arial" size="2"><font face="Times New
Roman" size="3">?</font></font></div>
<div><br>
Dr. Antonino Claudio Bonan<br>
----- Original Message ----- </div>
<blockquote style="BORDER-LEFT: #000000 2px solid;
PADDING-LEFT: 5px; PADDING-RIGHT: 0px; MARGIN-LEFT: 5px;
MARGIN-RIGHT: 0px">
<div style="FONT: 10pt arial; BACKGROUND: #e4e4e4;
font-color: black"><b>From:</b> <a
moz-do-not-send="true" title="ivtoman@inet.hr"
href="mailto:ivtoman@inet.hr" target="_blank">Ivan
Toman</a> </div>
<div style="FONT: 10pt arial"><b>To:</b> <a
moz-do-not-send="true" title="gradsusr@gradsusr.org"
href="mailto:gradsusr@gradsusr.org" target="_blank">gradsusr@gradsusr.org</a>
</div>
<div style="FONT: 10pt arial"><b>Sent:</b> Tuesday,
September 17, 2013 9:04 PM</div>
<div style="FONT: 10pt arial"><b>Subject:</b> Re:
[gradsusr] Averaging over multiple dimension ranges</div>
<div><br>
</div>
<div class="moz-cite-prefix">Hello,<br>
<br>
Jeff's idea was to find area sizes with atot function
(or asum like I tried). When I know area sizes, I can
weight them in total average from three rectangular
areas:<br>
<br>
total average =
((averageA1*sizeA1)+(averageA2*sizeA2)+(averageA3*sizeA3))/3<br>
<br>
It looks to me that logic is valid.<br>
<br>
Ivan<br>
<br>
<br>
<br>
On 09/17/2013 08:43 PM, Kishore Ragi wrote:<br>
</div>
<blockquote
cite="mid:CAN4rXbQ+dK4QGavgaYLv88p5avPRrABBMB8xvTwvLj0aMdxViA@mail.gmail.com">
<div dir="ltr">Ivan,
<div><br>
</div>
<div>How can you find the area average with asum? If
you can do with asum, the same is with aave()/ave()
... </div>
<div><br>
</div>
<div>Anyway, I don't understand what you wanted to
calculate. <br>
</div>
<div><br>
</div>
<div>Regards,</div>
<div><br>
</div>
<div>Kishore</div>
<div><br>
</div>
<div><br>
</div>
</div>
<div class="gmail_extra"><br>
<br>
<div class="gmail_quote">On Tue, Sep 17, 2013 at 11:59
PM, Ivan Toman <span dir="ltr"><<a
moz-do-not-send="true"
href="mailto:ivtoman@inet.hr" target="_blank">ivtoman@inet.hr</a>></span>
wrote:<br>
<blockquote style="BORDER-LEFT: #ccc 1px solid;
MARGIN: 0px 0px 0px 0.8ex; PADDING-LEFT: 1ex"
class="gmail_quote">
<div>
<div>Jeff,<br>
<br>
Option (2) seems to be a logical approach and
very nice idea. It looks to me that asum()
also works OK for "measuring" area sizes, it
is probably accurate enough.<br>
<br>
Best regards,<br>
Ivan
<div>
<div class="h5"><br>
<br>
<br>
On 09/17/2013 06:57 PM, Jeff Duda wrote:<br>
</div>
</div>
</div>
<div>
<div class="h5">
<blockquote>
<div dir="ltr">
<div>
<div>
<div>
<div>
<div>You could either...<br>
<br>
</div>
(1) Knowing the geometry of
earth, set up a math problem and
solve for the areas of a sphere
bounded by such
latitudinal/longitudinal
coordinates to find the areas of
those three regions (I would use
spherical coordinates)<br>
<br>
</div>
OR<br>
<br>
</div>
(2) -Create a flat field of ones
(e.g., 'define ones = tmp2m/tmp2m')<br>
</div>
-Use the atot function (grads
2.0.2+ only) to compute the sum of the
ones field over your area, which I
think should give you the area of each
region<br>
<br>
Then weight each areal average by the
area and compute the final weighted
average.<br>
<br>
</div>
I've never tried this, so I'm not 100%
sure it will work and be accurate. I
would play around with the atot function
first to see if it really does give you
the areas of the regions.<br>
<div><br>
Jeff Duda<br>
</div>
</div>
<div class="gmail_extra"><br>
<br>
<div class="gmail_quote">On Tue, Sep 17,
2013 at 11:45 AM, Ivan Toman <span
dir="ltr"><<a
moz-do-not-send="true"
href="mailto:ivtoman@inet.hr"
target="_blank">ivtoman@inet.hr</a>></span>
wrote:<br>
<blockquote style="BORDER-LEFT: #ccc
1px solid; MARGIN: 0px 0px 0px
0.8ex; PADDING-LEFT: 1ex"
class="gmail_quote">Hello,<br>
<br>
If I want to find average value over
a lat/lon range, I would do:<br>
<br>
ave(variable,lat=20,lat=21),lon=70,lon=71)<br>
<br>
<br>
However, if I want to do average
over multiple areas, for example:<br>
<br>
Area 1: lat=20,lat=21 ;
lon=60,lon=61<br>
Area 2: lat=30,lat=31 ;
lon=70,lon=71<br>
Area 3: lat=40,lat=41 ;
lon=80,lon=81<br>
<br>
how can I solve this problem? I
can't simply find three area
averages,<br>
sum them together and divide by
three, because areas are not the
same sizes.<br>
<br>
Thanks for any hint.<br>
<br>
Regards,<br>
Ivan Toman<br>
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<br>
<br clear="all">
<br>
-- <br>
Jeff Duda<br>
Graduate research assistant<br>
University of Oklahoma School of
Meteorology<br>
Center for Analysis and Prediction of
Storms<br>
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