<html><head></head><body><div class="ydp166f7388yahoo-style-wrap" style="font-family:bookman old style, new york, times, serif;font-size:16px;"><div><div dir="ltr" data-setdir="false">Hi Kemal (and all),</div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">Thank you so much for your kind help. Your guidance has been incredibly helpful to me.</div><div dir="ltr" data-setdir="false"><div>
<p>For more clarification, I’d like to elaborate on a couple of points. Regarding zooming in and plotting wind vectors at every 5th grid point, my goal is to obtain a better resolution to analyze wind direction in more detail. By selecting every 5th grid point as a sample, I aim to control the density of wind vectors on the plot to achieve the most effective visualization.</p>
<div dir="ltr" data-setdir="false"><span><span style="color: rgb(29, 29, 29); font-family: bookman old style, new york, times, serif; font-size: 16px; background-color: rgb(255, 255, 255);">Additionally, I’d like to plot wind vectors for every 5th grid point as an example, while still including all grid points of the WRF domain on the plot. This approach would help balance clarity and detail in the visualization.</span></span><br></div><div dir="ltr" data-setdir="false"><span><span style="color: rgb(29, 29, 29); font-family: bookman old style, new york, times, serif; font-size: 16px; background-color: rgb(255, 255, 255);"><br></span></span></div><div>When I refer to "zooming in," I don't mean simply isolating a portion of the map or plot. Rather, I’m looking to enhance resolution to reveal finer details, increase the grid points displayed, and present more specific variable information.</div></div><div><br></div><div dir="ltr" data-setdir="false">I tried to illustrate more clearly in the following hypothetical image what I mean by plotting every grid point while plotting wind vectors for every 5th grid point.</div><div dir="ltr" data-setdir="false"><div><div dir="ltr" data-setdir="false" style="color: rgb(29, 29, 29); font-family: bookman old style, new york, times, serif; font-size: 16px; background-color: rgb(255, 255, 255);"><div dir="ltr" data-setdir="false">Any assistance would be appreciated.</div><div><br></div></div><div class="ydp166f7388signature" style="color: rgb(29, 29, 29); font-family: bookman old style, new york, times, serif; font-size: 16px; background-color: rgb(255, 255, 255);"><div dir="ltr" style="font-family: old times, serif;"><div></div></div></div></div></div><div dir="ltr" data-setdir="false"><img title="Inline image" alt="Inline image" src="cid:5dcd5150-fea3-2728-155e-5765fd93c37c@yahoo.com" class="yahoo-inline-image" draggable="false" style="max-width: 800px;" data-id="<5dcd5150-fea3-2728-155e-5765fd93c37c@yahoo.com>"></div><div dir="ltr" data-setdir="false"><i style="color: rgb(0, 0, 0); font-family: old times, serif;"><font size="2">-----------------------------------------------------------------------------</font></i><span></span></div></div><div class="ydp166f7388signature"><div dir="ltr" style="font-family:old times, serif;font-size:16px;"><div dir="ltr" style="color:rgb(0, 0, 0);font-family:old times, serif;font-size:16px;"> <div><div style="color:rgb(0, 0, 0);font-family:serif;font-size:16px;"><div dir="ltr"><i><font size="2">Best regards,</font></i></div><div dir="ltr"><i><font size="2">Ehsan Taghizadeh</font></i></div></div></div></div></div></div></div>
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On Monday, April 7, 2025 at 11:11:28 AM PDT, Gurer, Kemal@ARB <kemal.gurer@arb.ca.gov> wrote:
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<p class="ydp166f7388yiv5947687349MsoNormal"><span style="font-size:11.0pt;">I forgot to address one specific question that you had asked, which is you want to plot 10m wind vectors at every 5<sup>th</sup> grid points. In ncl, you can specify that via, for example,</span></p>
<p class="ydp166f7388yiv5947687349MsoNormal"><span style="font-size:11.0pt;"> </span></p>
<p class="ydp166f7388yiv5947687349MsoNormal"><span style="font-size:11.0pt;"> U = u10(it,::5,::5) </span></p>
<p class="ydp166f7388yiv5947687349MsoNormal"><span style="font-size:11.0pt;"> </span></p>
<p class="ydp166f7388yiv5947687349MsoNormal"><span style="font-size:11.0pt;">where the dimensions of u are:</span></p>
<p class="ydp166f7388yiv5947687349MsoNormal"><span style="font-size:11.0pt;"> </span></p>
<p class="ydp166f7388yiv5947687349MsoNormal"><span style="font-size:11.0pt;"> [Time x [south_north] x [west_east]</span></p>
<p class="ydp166f7388yiv5947687349MsoNormal"><span style="font-size:11.0pt;"> </span></p>
<p class="ydp166f7388yiv5947687349MsoNormal"><span style="font-size:11.0pt;">and 5 is the incremental value that you want to plot every 5<sup>th</sup> grid points.</span></p>
<p class="ydp166f7388yiv5947687349MsoNormal"><span style="font-size:11.0pt;"> </span></p>
<p class="ydp166f7388yiv5947687349MsoNormal"><span style="font-size:11.0pt;">Kemal.</span></p>
<p class="ydp166f7388yiv5947687349MsoNormal"><span style="font-size:11.0pt;"> </span></p>
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<p class="ydp166f7388yiv5947687349MsoNormal"><b><span style="font-size:11.0pt;font-family:sans-serif;">From:</span></b><span style="font-size:11.0pt;font-family:sans-serif;"> ncl-talk <ncl-talk-bounces@mailman.ucar.edu>
<b>On Behalf Of </b>Gurer, Kemal@ARB via ncl-talk<br>
<b>Sent:</b> Monday, April 7, 2025 10:26 AM<br>
<b>To:</b> Ehsan Taghizadeh <ehsantaghizadeh@yahoo.com>; Ncl-talk <ncl-talk@ucar.edu><br>
<b>Subject:</b> Re: [ncl-talk] Visualization of WRF Output: Superimposition and Zooming</span></p>
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you recognize the sender and know the content is safe.</span></b><span style="font-size:10.0pt;font-family:sans-serif;color:black;">
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<p class="ydp166f7388yiv5947687349MsoNormal"><span style="font-size:11.0pt;">Hi Ehsan,</span></p>
<p class="ydp166f7388yiv5947687349MsoNormal"><span style="font-size:11.0pt;"> </span></p>
<p class="ydp166f7388yiv5947687349MsoNormal"><span style="font-size:11.0pt;">There is a transition from ncl to python usage to plot variables from WRF outputs and, for example, you can get the routine from here:</span></p>
<p class="ydp166f7388yiv5947687349MsoNormal"><span style="font-size:11.0pt;"> </span></p>
<p class="ydp166f7388yiv5947687349MsoNormal"><span style="font-size:11.0pt;"><a href="https://github.com/NCAR/wrf-python" rel="nofollow" target="_blank">https://github.com/NCAR/wrf-python</a></span></p>
<p class="ydp166f7388yiv5947687349MsoNormal"><span style="font-size:11.0pt;"> </span></p>
<p class="ydp166f7388yiv5947687349MsoNormal"><span style="font-size:11.0pt;">I have certainly experimented with python to plot WRF outputs. However, since I have been using ncl for quite some time, I feel comfortable tweaking the ncl scripts to get the plots that I want. In the ncl
script that I gave you, you set the lat/lon values of the corners of your plot area using the following variables for all variables:</span></p>
<p class="ydp166f7388yiv5947687349MsoNormal"><span style="font-size:11.0pt;"> </span></p>
<p class="ydp166f7388yiv5947687349MsoNormal"><span style="font-size:11.0pt;"> vecres1@mpLeftCornerLatF = xlatmin</span></p>
<p class="ydp166f7388yiv5947687349MsoNormal"><span style="font-size:11.0pt;"> vecres1@mpRightCornerLatF = xlatmax</span></p>
<p class="ydp166f7388yiv5947687349MsoNormal"><span style="font-size:11.0pt;"> vecres1@mpLeftCornerLonF = xlonmin</span></p>
<p class="ydp166f7388yiv5947687349MsoNormal"><span style="font-size:11.0pt;"> vecres1@mpRightCornerLonF = xlonmax</span></p>
<p class="ydp166f7388yiv5947687349MsoNormal"><span style="font-size:11.0pt;"> </span></p>
<p class="ydp166f7388yiv5947687349MsoNormal"><span style="font-size:11.0pt;">to zoom into the area that you want to focus on. Experiment with the script and the rest will be a breeze for you.</span></p>
<p class="ydp166f7388yiv5947687349MsoNormal"><span style="font-size:11.0pt;"> </span></p>
<p class="ydp166f7388yiv5947687349MsoNormal"><span style="font-size:11.0pt;">Kemal.</span></p>
<p class="ydp166f7388yiv5947687349MsoNormal"><span style="font-size:11.0pt;"> </span></p>
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<p class="ydp166f7388yiv5947687349MsoNormal"><b><span style="font-size:11.0pt;font-family:sans-serif;">From:</span></b><span style="font-size:11.0pt;font-family:sans-serif;"> Ehsan Taghizadeh <<a href="mailto:ehsantaghizadeh@yahoo.com" rel="nofollow" target="_blank">ehsantaghizadeh@yahoo.com</a>>
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<b>Sent:</b> Sunday, April 6, 2025 7:42 PM<br>
<b>To:</b> Ncl-talk <<a href="mailto:ncl-talk@ucar.edu" rel="nofollow" target="_blank">ncl-talk@ucar.edu</a>>; Gurer, Kemal@ARB <<a href="mailto:kemal.gurer@arb.ca.gov" rel="nofollow" target="_blank">kemal.gurer@arb.ca.gov</a>><br>
<b>Subject:</b> Re: [ncl-talk] Visualization of WRF Output: Superimposition and Zooming</span></p>
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you recognize the sender and know the content is safe.</span></b><span style="font-size:10.0pt;font-family:sans-serif;color:black;">
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<p class="ydp166f7388yiv5947687349MsoNormal"><span style="font-family:Old serif;">Hi Kemal,</span></p>
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<p><span style="font-family:Old serif;">Thank you so much for sharing your script! It looks great and very well-commented, making it easier to understand its functionality. I truly appreciate the effort you've put into creating and providing
this.</span></p>
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<p class="ydp166f7388yiv5947687349MsoNormal"><span style="font-family:Old serif;">I'm planning to use your script to plot WRF data for my research.</span></p>
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<p class="ydp166f7388yiv5947687349MsoNormal"><span style="font-family:Old serif;"> </span></p>
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<p class="ydp166f7388yiv5947687349MsoNormal"><span style="font-family:Old serif;">Just to clarify, my main challenge involves zooming in on a specific region, superimposing three variables, and plotting the wind vector for a specific interval of grid points.</span></p>
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<p><span style="font-family:Old serif;">I hope it's okay to ask for a bit more guidance—specifically on how to modify the
</span><code><span style="font-size:10.0pt;"><a href="https://www.ncl.ucar.edu/Applications/Scripts/dataonmap_zoom_10.ncl" rel="nofollow" target="_blank">dataonmap_zoom_10.ncl</a></span></code><span style="font-family:Old serif;"> script to meet these requirements. If anyone
has any insights on achieving this or can suggest adjustments, that would be incredibly helpful.</span></p>
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<p class="ydp166f7388yiv5947687349MsoNormal"><span style="font-family:Old serif;">Additionally, if any GeoCAT or Python scripts might suit these needs, I'd greatly appreciate your recommendations.</span></p>
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<p class="ydp166f7388yiv5947687349MsoNormal"><span style="font-family:Old serif;"> </span></p>
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<p class="ydp166f7388yiv5947687349MsoNormal"><span style="font-family:Old serif;">Any further assistance would mean a lot to me.</span></p>
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<p class="ydp166f7388yiv5947687349MsoNormal"><i><span style="font-size:10.0pt;font-family:New serif;color:black;">-----------------------------------------------------------------------------</span></i><span style="font-family:New serif;color:black;"></span></p>
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<p class="ydp166f7388yiv5947687349MsoNormal"><i><span style="font-size:10.0pt;font-family:New serif;color:black;">Best regards,</span></i><span style="font-family:New serif;color:black;"></span></p>
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<p class="ydp166f7388yiv5947687349MsoNormal"><i><span style="font-size:10.0pt;font-family:New serif;color:black;">Ehsan Taghizadeh</span></i><span style="font-family:New serif;color:black;"></span></p>
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<p class="ydp166f7388yiv5947687349MsoNormal"><span style="font-size:10.0pt;font-family:sans-serif;">On Wednesday, April 2, 2025 at 08:06:35 PM PDT, Gurer, Kemal@ARB <<a href="mailto:kemal.gurer@arb.ca.gov" rel="nofollow" target="_blank">kemal.gurer@arb.ca.gov</a>> wrote:
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<p class="ydp166f7388yiv5947687349ydpd525f42eyiv2519996257msonormal"><span style="font-size:11.0pt;font-family:sans-serif;">Hi Ehsan,</span><span style="font-size:10.0pt;font-family:sans-serif;"></span></p>
<p class="ydp166f7388yiv5947687349ydpd525f42eyiv2519996257msonormal"><span style="font-size:11.0pt;font-family:sans-serif;"> </span><span style="font-size:10.0pt;font-family:sans-serif;"></span></p>
<p class="ydp166f7388yiv5947687349ydpd525f42eyiv2519996257msonormal"><span style="font-size:11.0pt;font-family:sans-serif;">Try the attached ncl script to plot horizontal cross sections of several variables from your WRF output. Just read the command lines and posted comments
to understand how the script operates and disregard the warnings that ncl issues. You can plot other variables by looking at the examples given in the script.</span><span style="font-size:10.0pt;font-family:sans-serif;"></span></p>
<p class="ydp166f7388yiv5947687349ydpd525f42eyiv2519996257msonormal"><span style="font-size:11.0pt;font-family:sans-serif;"> </span><span style="font-size:10.0pt;font-family:sans-serif;"></span></p>
<p class="ydp166f7388yiv5947687349ydpd525f42eyiv2519996257msonormal"><span style="font-size:11.0pt;font-family:sans-serif;">Kemal.</span><span style="font-size:10.0pt;font-family:sans-serif;"></span></p>
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<p class="ydp166f7388yiv5947687349ydpd525f42eyiv2519996257msonormal"><b><span style="font-size:11.0pt;font-family:sans-serif;">From:</span></b><span style="font-size:11.0pt;font-family:sans-serif;"> ncl-talk <<a href="mailto:ncl-talk-bounces@mailman.ucar.edu" rel="nofollow" target="_blank">ncl-talk-bounces@mailman.ucar.edu</a>>
<b>On Behalf Of </b>Ehsan Taghizadeh via ncl-talk<br>
<b>Sent:</b> Tuesday, April 1, 2025 10:50 PM<br>
<b>To:</b> Ncl-talk <<a href="mailto:ncl-talk@ucar.edu" rel="nofollow" target="_blank">ncl-talk@ucar.edu</a>><br>
<b>Subject:</b> [ncl-talk] Visualization of WRF Output: Superimposition and Zooming</span><span style="font-size:10.0pt;font-family:sans-serif;"></span></p>
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<b><span style="font-size:10.0pt;font-family:sans-serif;color:#9C6500;">CAUTION: This email originated from outside of the organization. Do not click links or open attachments unless you recognize the sender and know the content is safe.</span></b><span style="font-size:10.0pt;font-family:sans-serif;color:black;">
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<p class="ydp166f7388yiv5947687349ydpd525f42eyiv2519996257msonormal"><span style="font-size:10.0pt;font-family:serif;">Dear NCL team,</span><span style="font-size:10.0pt;font-family:sans-serif;"></span></p>
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<p><span style="font-size:10.0pt;font-family:serif;">I would like to plot 10 m wind vectors, 2 m temperature as contours, and topography as shaded from a WRF output file. Additionally, I need to zoom in on a domain approximately 1 × 1 degree. For
instance, I would like to display one wind vector for every five grid points.</span><span style="font-size:10.0pt;font-family:sans-serif;"></span></p>
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<p class="ydp166f7388yiv5947687349ydpd525f42eyiv2519996257msonormal"><span style="font-size:10.0pt;font-family:serif;">I reviewed the provided page (</span><span style="font-size:10.0pt;font-family:sans-serif;"><a href="https://www.ncl.ucar.edu/Applications/wrfzoom.shtml" rel="nofollow" target="_blank"><span style="font-family:serif;">https://www.ncl.ucar.edu/Applications/wrfzoom.shtml</span></a></span><span style="font-size:10.0pt;font-family:serif;">)
and tried the attached script. While it is relatively clean, it has some issues—particularly with the labels on the axes, as shown.</span><span style="font-size:10.0pt;font-family:sans-serif;"></span></p>
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<p><span style="font-size:10.0pt;font-family:serif;">Any assistance in creating such a script would be greatly appreciated.</span><span style="font-size:10.0pt;font-family:sans-serif;"></span></p>
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<p class="ydp166f7388yiv5947687349ydpd525f42eyiv2519996257msonormal"><i><span style="font-size:10.0pt;font-family:serif;color:black;">-----------------------------------------------------------------------------</span></i><span style="font-size:10.0pt;font-family:sans-serif;"></span></p>
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<p class="ydp166f7388yiv5947687349ydpd525f42eyiv2519996257msonormal"><i><span style="font-size:10.0pt;font-family:serif;color:black;">Best regards,</span></i><span style="font-size:10.0pt;font-family:sans-serif;"></span></p>
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<p class="ydp166f7388yiv5947687349ydpd525f42eyiv2519996257msonormal"><i><span style="font-size:10.0pt;font-family:serif;color:black;">Ehsan Taghizadeh</span></i><span style="font-size:10.0pt;font-family:sans-serif;"></span></p>
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<p class="ydp166f7388yiv5947687349ydpd525f42eyiv2519996257msonormal"><i><span style="font-size:10.0pt;font-family:serif;color:black;">Ph.D. Student in Natural Resources & Environmental Studies (NRES),</span></i><span style="font-size:10.0pt;font-family:sans-serif;"></span></p>
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<p class="ydp166f7388yiv5947687349ydpd525f42eyiv2519996257msonormal"><i><span style="font-size:10.0pt;font-family:serif;color:black;"> University of Northern British Columbia (UNBC)</span></i><span style="font-size:10.0pt;font-family:sans-serif;"></span></p>
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