<div dir="ltr"><div><div><div><div><div>Dear all,<br></div>ashwinD12's answer and Ildan's answer give me a practical ways to determine i_start and j_start. Thank you so much ashwinD12 and Ildan. <br><br></div> I have another question which I posted several days ago but was hold and not got posted: <br></div>What is constrain/standard to choose dx and dy? Previously, I was using equivalent resolution in km on equator corresponding to resolution of meteorological data in degree. Is there any official criteria about choosing dx and dy? <br><br></div>Thank you!<br><br></div>Zhixuan Cao<br></div><div class="gmail_extra"><br><div class="gmail_quote">2016-10-27 19:27 GMT-04:00 ashwinD12 . <span dir="ltr"><<a href="mailto:winash12@gmail.com" target="_blank">winash12@gmail.com</a>></span>:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><a href="http://earthscience.stackexchange.com/questions/2732/how-to-get-cell-indices-from-latitude-and-longitude-in-wrf-model-grids" target="_blank">http://earthscience.<wbr>stackexchange.com/questions/<wbr>2732/how-to-get-cell-indices-<wbr>from-latitude-and-longitude-<wbr>in-wrf-model-grids</a><br><div><br></div><div>Is this what you are looking for ? </div></div><div class="gmail_extra"><br><div class="gmail_quote"><div><div class="h5">On Fri, Oct 28, 2016 at 2:47 AM, 曹智选 <span dir="ltr"><<a href="mailto:hitcaozx@gmail.com" target="_blank">hitcaozx@gmail.com</a>></span> wrote:<br></div></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div class="h5"><div dir="ltr"><div>Hello, <br></div><div>I am runing WRF with nested domain to get higher resolution meteorological data for a specific region. So the longutide range and latitude range of this specific domain is known. <br><br></div><div>How to determine i_start and j_start for the nested domain so that these "finer-resolution domain" covers the region of interest. <br><br></div><div>To be more specific, I am looking for detailed documentaion that can tell me the map between real world (Earth's surface and atmosphere above) to the vitual world (The simulation domain.). <br><br></div><div>Chapter 3 of user manual gives a little information. As for projection "Polar Stereographic" and "Lambert ", the projected earth surface can not fill up the rectangular box. There are some "empty areas". So what will be the simulation domain looks like. Is it a regular box?<br><br></div><div>In WRF simulation, should the nodes carries meteorological data concide with nodes of coarse domain? <br><br></div><div>Thank you!<br><br></div><div>Zhixuan Cao <br></div><div><br></div></div>
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