Indonesia Pre-Scoping Lab Notes

Indonesia Pre-scoping Lab Notes Lab Note 2: Rainfall Data Michael Norton 2/19/09

Topic 1: Summary of Rainfall Data

The IRI has some rainfall data from Indramayu district,

This is a table with a quick summary of the quality of data represented in those Excel files. Station Name lists every station for which an Excel file exists. Located? indicates whether or not the station was found on fallingrain.com, which lists rainfall stations around the world. The coordinate information that accompanied the data is somewhat goofy and needs to be rechecked, so this is just for temporary purposes until we get something more definite. The Proper Format? column indicates whether or not the data is in the kind of format we like. Generally, the rainfall data is organized into three sheets within Excel – daily, dekadal, and monthly, where the latter two are simply reorganizations of the daily rainfall data. Some of the stations only include monthly, daily etc. when we really need daily, or are in a different format altogether (like from a database or something). So this column basically indicates whether or not there is daily precipitation data with the days as rows and years as columns because we can easily recreate the dekadal and monthly sums if necessary. Range, Missing Years, and Incomplete Years indicate the quality of data that we have – there are some years which don’t have data for some reason. Latitude and Longitude coordinates are also provided, but are a bit rough and could be improved – the data from fallingrain.com is obviously in some sort of DDMMSS format that is only so sensitive. We’ll need to check with IPB on this.

Station Name Located? Format? Range Missing Years Inc. Years Latitude Longitude Anjatan Yes Yes 1972-2002 (31) 2 2 -6.34 107.9583 Bangkir No Yes 1966-2002 (37) 3 0 -- -- BDG(METEO) (Bandung?) No ------Bondan_Harian Yes No ------6.6 108.2833 Bugel Yes Yes 1972-2002 (31) 2 3 -6.31667 108 Bulak No No ------Cidempet Yes Yes 1971-2002 (32) 1 2 -6.35 108.25 Cikedung Yes Yes 1966-2002 (37) 0 1 -6.48333 108.16667 Cipancuh No Yes 1972-2002 (31) 0 1 -- -- Gantar Yes Yes 1972-2002 (31) 4 3 -6.5172 107.9803 Gb. Wetan No Yes 1972-2002 (31) 0 2 -- -- Indramayu Yes Yes 1979-2002 (24) 0 1 -6.3333 108.3167 Jatibarang Yes Yes 1979-2002 (24) 0 1 -6.4667 108.2833 Juntinyuat Yes Yes 1979-2002 (24) 0 0 -6.4333 108.4333 Kedokan Bunder Yes Yes 1979-2002 (24) 0 2 -6.5 108.41667 Krangkeng Yes Yes 1979-2002 (24) 0 0 -6.5 108.48333 Kroya Yes Yes 1972-2002 (31) 1 2 -6.4833 108.05 Lohbener Yes Yes 1979-2002 (24) 0 1 -6.4 108.2667 Losarang Yes Yes 1971-2002 (32) 0 0 -6.4 108.1667 Lw. Semut No Yes 1972-2002 (31) 2 5 -- -- Psk. Negara No Yes 1976-1993 (18) 0 0 -- -- Salam Darma No No ------Sudikampiran Yes Yes 1979-2002 (24) 0 1 -6.4833 108.3667 Sudimampur Lor Yes Yes 1979-2002 (24) 0 0 -6.41667 108.36667 Sukadana Yes Yes 1971-2002 (32) 0 0 -6.55 108.3 Sukra Yes Yes 1972-2002 (31) 3 6 -6.3 107.9333 Sumurwatu Yes No ------6.5333 108.1167 Tamiyang Yes Yes 1972-2002 (31) 1 2 -6.0603 107.2489 Tl. Kacang No Yes 1972-2002 (31) 4 3 -- -- Tugu Yes Yes 1971-2002 (32) 1 1 -6.43 108.33 Ujungaris No Yes 1971-2002 (32) 9 1 -- -- Wanguk Yes Yes 1972-1999 (28) 1 4 -6.41306 107.95778

Topic 2: Location of stations

Here are the stations as depicted in Google Earth from the fallingrain.com coordinates. Most of the stations are tightly clustered in the district. There are two stations located which have unusable data (with red icons). All stations are located at a few meters of elevation above sea level as Indramayu is a very flat district which does not include the higher elevations of the mountains a little further to the south. This could make things interesting as this will mean nearly all agriculture will be irrigation-based and not directly based on daily rainfall. There is still a lot of uncertainty in these locations as you can see that it doesn’t match up very well with the data map we have in the Wiki. Additionally it looks as if there is a wealth of GIS data somewhere that I’d like to get my hands on, sub-districts and sub-sub-districts or whatever the smaller ones are in this graphic. So consider this Google Earth picture to be temporary until we can provide something better. The following stations weren’t in Fallingrain.com, but are sometimes available on other sites. Mostly it’s a problem with me not knowing what the abbreviations mean

Possible? More? Bangkir BDG(METEO) Bandung? Gb. Wetan Gebang? Gambarsari? Lw. Semut Psk. Negara Salam Darma Tl. Kacang Ujungaris Ujungjaya?

Yasir is currently working on a program to convert the data to the data library format.