<div dir="ltr"><div>Hi,</div><div><br></div><div>No, not in meters -- you're trying to find the indices of the grid cells that correspond to the corners of your smaller domain. For instance, what are the values i,j that correspond to the corner (-10N,44.5E) <br></div><div><br></div><div>RB<br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, Sep 11, 2020 at 8:11 AM Geeta Geeta <<a href="mailto:geetag54@yahoo.com">geetag54@yahoo.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Soory Mr Rick. It is not clear to me. <br>
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4 corners of large domain are (-10N,44.5E) , (-10,105.5), (45.5,105.5), (45.5,44.5). <br>
I want small domain to be 10-20N/70-75E. <br>
So I have to calculate the X Y (distance in meters)?. <br>
kindly clarify . <br>
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Geeta.<br>
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On Friday, 11 September, 2020, 07:20:57 pm IST, Rick Brownrigg <<a href="mailto:brownrig@ucar.edu" target="_blank">brownrig@ucar.edu</a>> wrote:<br>
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Hi,<br>
I *think* the trick here is to compute the i,j indices of the grid that correspond to your smaller domain. Since it's a mercator projection, and the original domain is relatively small (60x60 degs), I would think you could get decent results by using a simple linear scaling to find those values. So if the grid is NxM (LatxLon), and you extract the min/max lat/lons from the attributes into variables minLon, maxLon, etc., then something like:<br>
<br>
minI = tointeger( minLonSmallerDomain * (M -0) / (maxLon - minLon) ) ; truncating<br>
maxI = tointeger( maxLonSmallerDomain * (M -0) / (maxLon - minLon) )...similarly for Y...<br>
and then:<br>
Plot(0) = gsn_csm_contour_map(wks,TIR1_INVERTED(0,minJ:maxJ,minI:maxI),rescount)<br>
and don't forget to substitute appropriate values into the mpLeft/RightCornerLat/LonF resources.<br>
Does that make sense?<br>
Rick<br>
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On Fri, Sep 11, 2020 at 4:22 AM Geeta Geeta via ncl-talk <<a href="mailto:ncl-talk@mailman.ucar.edu" target="_blank">ncl-talk@mailman.ucar.edu</a>> wrote:<br>
Hi.<br>
<br>
I have satellite data which has a resultion of 4 km (TIR1) and there is projection information provided in the datafile.<br>
<br>
integer Projection_Information ( DIM_000 )<br>
<br>
DIMENSION_LIST : <ARRAY of 0 elements><br>
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false_easting : 0<br>
<br>
false_northing : 0<br>
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grid_mapping_name : mercatorpor Brightness Temperaturerature<br>
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longitude_of_projection_origin : 75<br>
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lower_left_lat_lon(degrees) : ( -10, 44.5 )<br>
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lower_right_lat_lon(degrees) : ( -10, 105.5 )<br>
<br>
semi_major_axis : 6378137<br>
<br>
semi_minor_axis : 6356752.3142<br>
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standard_parallel : 17.75<br>
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upper_left_lat_lon(degrees) : ( 45.5, 44.5 )<br>
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upper_left_xy(meters) : ( -3234623.003937, 5401854.420193 )<br>
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upper_right_lat_lon(degrees) : ( 45.5, 105.5 )<br>
<br>
The lat/lon are not provided.<br>
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Plotting the TIR1 (count), radiance and Brightness temperature for the entire domain is happening by using information from the Projection info. This INFO is used from the Line numbers 109-114 of the code.<br>
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My questions are 1. I am Not able to plot the data for a smaller domain of my ineterst<br>
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2. since I am unable to attch the lat/lon arrays to the variables, I am unable to plot the data for a smaller domain and unable to write the data for a smaller domain of my intererst.<br>
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the Images are attached.<br>
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Request someone to help me.<br>
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Geeta._______________________________________________<br>
<br>
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