NOTICE: This version of the NSF Unidata web site (archive.unidata.ucar.edu) is no longer being updated.
Current content can be found at unidata.ucar.edu.
To learn about what's going on, see About the Archive Site.
NOTICE: This version of the NSF Unidata web site (archive.unidata.ucar.edu) is no longer being updated.
Current content can be found at unidata.ucar.edu.
To learn about what's going on, see About the Archive Site.
Anyone? Little help? Ben Kamen wrote:
ok - so then let me know if this is possible: I assume we are agreed on what a "gate" is.... Set up two arrays of two dimensions each (az, ra). Range wants to be even km for REF, of course. Az can be any resolution. Even degrees (0-359) is convenient and is assumed below. The two arrays hold the data for averaging one elevation for >1 scan (so two dimensions are enough, but that is a detail). SumZ Holds the sum of Z (not dBZ) for all gates and portions of gates that fall in that azimuth and range. N Holds the number of gates that have contributed to SumZ. This is not usually an integer. Most Nexrad gates will have azimuths that are not even integers. (An azimuth such as 15.000 degrees is an edge case in the coding.) The procedure is to convert each range gate's dBZ value to Z and compute what two SumZ azimuths it overlaps. Then run along the ranges. Add z*p and z*(1-p) to the two elements of SumZ. Add p and (1-p) to the two elements of N. After all the desired scans have been summed in this way, divide SumZ by N to get average Z and convert to dBZ for displaying. Can that be done in IDV?
Thanks! -Ben -- Ben Kamen - O.D.T., S.P. ============================================================================= Email: bkamen AT benjammin DOT net Web: http://www.benjammin.net As seen somewhere on the net: My other computer is your Windows Server.
idvusers archives: