date: Tue Aug 22 11:01:32 2000
from: Phil Jones
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
>To: "'Jones, Phil (CRU/Univ. East Anglia)'"
>Cc: Rudolf Bruno ,
> Meyer-Christoffer Anja
>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 |
>-------------------------------------------
>