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 | >------------------------------------------- >