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Duplicate lat/long points [message #64690]

Wed, 14 January 2009 02:21

hethomas
Messages: 19
Registered: December 2008

Junior Member

From searching this forum for "duplicate points" I found that a while
back, under the thread entitled "duplicates - a new twist" my problem
was posted (almost exactly identically) by Martin Doyle.
[ http://groups.google.com/group/comp.lang.idl-pvwave/browse_t hread/
thread/470ca560db41c58a/df9dba74d5788f6c?lnk=gst&q=dupli cate
+points#df9dba74d5788f6c ]

In short, I have a list of latitude, longitude and data and need to
combine any duplicate lat longs by summing the data value.

Despite the many follow up answers to this I am still having problems
with using the UNIQ function on both latitude and longtude as they
each need to be sorted numerically for IDL to work. Is anyone able to
shed any light on this?! Or indeed, know of a quicker/easier method.
There is a function in R called "aggregate" which appears to do
exactly what I need, but I am unable to find an IDL equivalent.

Any help is greatly appreciated!

Helen

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[Message index]

		Duplicate lat/long points By: hethomas on Wed, 14 January 2009 02:21
		Re: Duplicate lat/long points By: Jeremy Bailin on Thu, 15 January 2009 08:00
		Re: Duplicate lat/long points By: mccreigh on Fri, 16 January 2009 11:55
		Re: Duplicate lat/long points By: hethomas on Tue, 20 January 2009 05:57
		Re: Duplicate lat/long points By: Jeremy Bailin on Wed, 21 January 2009 07:14
		Re: Duplicate lat/long points By: Jeremy Bailin on Thu, 22 January 2009 06:58
		Re: Duplicate lat/long points By: mccreigh on Wed, 21 January 2009 08:02

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