> ----------
> From: Ilwis Support
> Sent: Friday, October 08, 1999 11:45:17 AM
> To: Ilwis-List
> Subject: RE: How to get minimum values?
> Auto forwarded by a Rule
>
Dear Rocio,
Procedure to make a table with minimum height values per basin:
* as input you need two maps: DTM (height value map, domain value) and
BASIN (Identifier map indicating the basins, domain ID). Both rastermaps
need to use the same GeoRef.
* Use the CROSS operation. As 1st input map select Basin, as 2nd DTM
(ignore undefs). Create an output table BasDTM.
* Create an attribute table for the Basins. (Use Right Mouse button
menu on the ID domain icon in the catalog, select Create table..)
* Open the newly create table. The Basin names are shown in the key
column.
* In the table window, select menu Columns | Join
* In the Join Columns form select BasDTM as table and DTM as column.
Make sure Aggregation is checked. Select Minimum as function and group by
Basin. Give a proper name for the output column
* Notice the new column in the table, indicating the minimum value per
basin.
Kind regards,
Jelger Kooistra
-------------------------------------------
Jelger Kooistra, ILWIS Support Officer
ITC - ILWIS Department
PO Box 6, 7500 AA Enschede, The Netherlands
phone: +31 53 4874217 fax: +31 53 4874484
e-mail: [EMAIL PROTECTED]
http://www.itc.nl/ilwis/dev/support
-------------------------------------------
> ----------
> From: ROCIO CASTILLO[SMTP:[EMAIL PROTECTED]]
> Sent: Friday, October 08, 1999 12:15:54 AM
> To: [EMAIL PROTECTED]
> Subject: How to get minimum values?
> Auto forwarded by a Rule
>
>
> Dear users:
> I am trying to get a table with minimum heigh values
> by basin. I have a MDT and a basins map, but I don't
> know how to combine them and get the results by basin
> into a table.
> Thanks in advance.
>
> Rocio Castillo
> Departamento de Geograf�a
> Universidad de Guadalajara
> M�xico
>
>
>
> =====
>
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