<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 .ctl file</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 </DIV> <DIV>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 lat ,long values and corresponding tb values.</DIV> <DIV> </DIV> <DIV>I wrote a program which writes out in binary these 3 below values in this order.<FONT size=1> <FONT size=2>lat
lon btd<BR> 37.820000 97.650002 250.000000<BR> 37.040001 93.779999 253.990005<BR> 36.709999 95.540001 254.320007 ----- [sample values how they look like in asci]<BR> -7.450000 6.810000 155.949997<BR> -7.760000 5.370000 320.000000</FONT></DIV> <DIV><FONT size=2> -9.310000 -1.820000 320.000000</FONT></DIV> <DIV><FONT size=2></FONT> </DIV> <DIV><FONT size=2>i dont have any level or time data. i dont need them rather.so i didnt print them in binary file.</FONT></DIV> <DIV><FONT size=2></FONT> </DIV> <DIV><FONT size=2>sample i wrote is<BR> <BR> DSET output.txt--------------------------[this is binary file]<BR> TITLE Sample Data Set<BR>&n
bsp;
UNDEF -9.99E33<BR> XDEF 100 LINEAR 1 1<BR> YDEF 100 LINEAR 1 1<BR> ZDEF 1 LINEAR 1 1<BR> TDEF 1 LINEAR 1JAN2000 1DY<BR> VARS 1<BR> btd 0 99 brightness value<BR> ENDVARS <BR></FONT></DIV> <DIV><BR> <BR><STRONG><FONT size=2>My doubts</FONT></STRONG></DIV> <DIV><STRONG><FONT size=2> 1. When i am giving it as btd it says undefined variable.How do i make it read btd values frm the binary file and map them accordin to the required lat and long values.</FONT></STRONG></DIV> <DIV><STRONG><FONT size=2></FONT></STRONG> </DIV> <DIV><STRONG><FONT size=2>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.</FONT></STRONG></DIV> <DIV><STRONG><FONT size=2></FONT></STRONG> </DIV> <DIV><STRONG><FONT size=2>3. Shuld the binary data contain,the data in order of longitude,latitude,level ,variable and time. and if we
dont
have any level or time data ,is it enough to take them as single value in .ctl file if not as some constant value in binary file.</FONT></STRONG></DIV> <DIV><STRONG><FONT size=2></FONT></STRONG> </DIV> <DIV><STRONG><FONT size=2>Any help in tellin how to write the data descriptor file would be greatly appreciated. </FONT></STRONG></DIV> <DIV><STRONG><FONT size=2></FONT></STRONG> </DIV> <DIV><STRONG><FONT size=2>regards </FONT></STRONG></DIV> <DIV><STRONG><FONT size=2>smitha <BR></DIV></FONT></STRONG></FONT><p>
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