date: Tue Aug 22 11:01:32 2000
from: Phil Jones <p.jones@uea.ac.uk>
subject: Redundant stations in CRU data set
to: Phillip.Reid@uea.ac.uk


 Phil,
   Can you have a look into this and get back to Udo ?
 You might need to have a chat with Mike.

 Cheers
 Phil


>From: Schneider Udo <Udo.Schneider@dwd.de>
>To: "'Jones, Phil (CRU/Univ. East Anglia)'" <p.jones@uea.ac.uk>
>Cc: Rudolf Bruno <brudolf@exch.dwd.de>,
>    Meyer-Christoffer Anja <ameyerch@exch.dwd.de>
>Subject: Redundant stations in CRU data set
>Date: Tue, 22 Aug 2000 11:53:31 +0200
>
>Dear Phil,
>
>in checking your CRU precipitation data set during the loading process into
>our relational data base management system (Oracle-based RDBMS), we found
>several redundant stations. Some of the stations are found 2 times, others
>even 3 times, with exactly the same station identifiers (WMO-ID and national
>station number), station name, geographical coordinates etc., but with, in
>part, significant differences in monthly precipitation amounts for the same
>month. For example in January 1986 we found for the following stations:
>
>Station name    Country  WMO-ID  Nat.-ID  Precip. total
>--------------  -------  ------  -------  -------------
>Arusha          TZA      63789   9336033   70      
>Arusha          TZA      63789   9336033   82
>Arusha          TZA      63789   9336033  147
>Victoria Falls  ZWE      67843      7800  104
>Victoria Falls  ZWE      67843      7800  135
>Victoria Falls  ZWE      67843      7800  185
>Somerset East   ZAF      68742             61
>Somerset East   ZAF      68742             68
>Glomfjord       NOR                80700  119
>Glomfjord       NOR                80700  147
>Carlsbad        USA               291469  110
>Carlsbad        USA               291469  140
>Academy 2 NE    USA               390043   11
>Academy 2 NE    USA               390043   12
>
>Is the reason for these redundant stations that you collected the data from
>different sources, or are there any other reasons for that? What monthly
>precipitation total is the right one in these cases or is most reliable?
>
>In order to use as many data of your data set as possible we are adding
>geographic information as far as possible (from the data sets delivered to
>us by many countries or from different sources of geographical information
>we have) for the stations where a part of the station meta data is missing.
>When this step will be completed we will send you the meta information for
>these stations so that you can make use of it in your future evaluations.
>
>Best regards,
>
>Udo
>      
>-------------------------------------------
>| Udo Schneider                           |
>| Global Precipitation Climatology Centre |
>| Deutscher Wetterdienst / FE 22          |
>| Email:  udo.schneider@dwd.de            |
>-------------------------------------------
>
