<DIV>Hi everyone,</DIV> <DIV> </DIV> <DIV>I am smita , and i just joined the grads user group.</DIV> <DIV> </DIV> <DIV>I am using grads for the first time, and i am bit confused regarding using data descriptor file. Can u plz help me with this issue.</DIV> <DIV> </DIV> <DIV>I am workin on a project which maps brightness values[tb] over required region for Ascending and Descending passes of satellite carrying passive microwave radiometer and as the satellite advances it gathers tb values.</DIV> <DIV> </DIV> <DIV>For the ascending pass[when satellite moves frm south to north] and descending[north to south] we have different btd values.I wrote a program which writes out in binary the required varying latitudes,longitudes ,Tbs values accordingly.</DIV> <DIV> </DIV> <DIV>lat
lon btd</DIV> <DIV>37.820000 97.650002 250.000000 <BR>37.040001 93.779999 253.990005 <BR>36.709999 95.540001 254.320007 ----- values in asci</DIV> <DIV>-7.450000 6.810000 155.949997 <BR>-7.760000 5.370000 320.000000 </DIV> <DIV>-9.310000 -1.820000 320.000000 </DIV> <DIV> </DIV> <DIV>I dont have any Time or Scale value preferences.Only 1 variable needs to be mapped thts Btd takin into account lat and longitude variations.</DIV> <DIV> </DIV> <DIV>Can u plz help me out with how to write the data descriptor file </DIV> <DIV>sample thing i wrote is </DIV> <DIV> </DIV> <DIV><FONT size=2> <div>DSET output.txt</div> <div>TITLE Sample Data Set </div>
<div>UNDEF -9.99E33 </div> <div>XDEF 100 LINEAR 1 1</div> <div>YDEF 100 LINEAR 1 1 </div> <div>ZDEF 1 LINEAR 1 1 </div> <div>TDEF 1 LINEAR 1JAN2000 1DY </div> <div>VARS 1 </div> <div>btd 0 99 brightness value </div> <div>ENDVARS</div></FONT></DIV> <DIV> </DIV> <DIV><STRONG>My doubts</STRONG></DIV> <DIV> </DIV> <DIV><STRONG>1. When i am giving it as btd it says undefined variable.How do i make it read btd values frm the binary file.</STRONG></DIV> <DIV><STRONG></STRONG> </DIV> <DIV><STRONG>2. Is the lat and longitude mapping accordin to the output.txt i am givin or, just taking range of lat and long values as mentioned by xdef and ydef.</STRONG></DIV> <DIV><STRONG></STRONG> </DIV> <DIV><STRONG>Plz tell me how i shuld write my data descriptor file.</STRONG></DIV> <DIV><STRONG></STRONG> </DIV> <DIV><STRONG>thnk u</STRONG></DIV> <DIV><STRONG></STRONG> </DIV> <DIV><STRONG>regards</STRONG></DIV> <DIV><STRONG>smitha</STRONG></D
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