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Re: Duplicates - a new twist [message #39447 is a reply to message #39441]

Tue, 18 May 2004 05:32

btt
Messages: 345
Registered: December 2000

Senior Member

Martin Doyle wrote:

> I have a dataset which consists of 3 columns: longitude, latitude and
> a value for an emission of an air pollutant. European countries report
> the emission of this pollutant for the latitude longitude coordinates
> which are within their countries. However, some of the latitude,
> longitude coordinates lie on the borders of countries and therefore an
> emission is sometimes reported by 2 or more countries for the same
> coordinate (i,e. There are multiple instances of the same coordinate
> within the dataset).
>
> What I need to do is to look through the dataset and sum the emissions
> when the coordinate is the same, resulting in a dataset with unique
> coordinates and a total emission for each grid point.
>
> Does anyone have any ideas about how to go about this? I've seen posts
> on this newsgroup which have had problems with duplicate values in one
> column of data, but I'm unsure about how to go about it when there are
> 2 columns which need to be examined.
>

Hello,

You should consider using GRID_INPUT. This is from the docs...

The GRID_INPUT procedure preprocesses and sorts two-dimensional
scattered data points, and removes duplicate values.

Ben

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[Message index]

		Re: Duplicates - a new twist By: R.G. Stockwell on Tue, 18 May 2004 12:35
		Re: Duplicates - a new twist By: btt on Tue, 18 May 2004 12:34
		Re: Duplicates - a new twist By: Bruce Bowler on Tue, 18 May 2004 12:10
		Re: Duplicates - a new twist By: btt on Tue, 18 May 2004 05:32
		Re: Duplicates - a new twist By: Chris[1] on Tue, 18 May 2004 04:42
		Re: Duplicates - a new twist By: Chris Lee on Tue, 18 May 2004 00:59

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