Satellite-Based Precipitation Data Delivery Systemfor Thailand

Infrastructure Development Institute-Japan1．About the Satellite-Based Precipitation Data Delivery
SystemThe Satellite-Based Precipitation Data Delivery System by using
GSMaP data provides river basin average precipitation and regional
average precipitation.
The system also notify when the observed basin or regional average
precipitation exceeds the pre-calculated probable precipitation with somereturn periods (for example, once in 5 years).

2．Overview of GSMaP
GSMaP is a precipitation intensity distribution map developed by using
the satellite observation data.

GSMaP: Global Satellite Mapping of Precipitation
Area: N60°〜S60°
Spatial resolution : 0.1°（ About 11km ）Time resolution : 1 hour3．Calculation of probable precipitation
with some return periods
The probable precipitation with some return periods is calculated byusing the precipitation records.
Table Calculation conditions
Unit
25basin、all Amphoe、0.1°mesh
Use data
Satellite-based precipitation（GSMaP）
Data period
2003〜2011
P r o b a b i l i t y 1/2、1/3、1/5、1/10、1/30
scale
C u m u l a t i v e 6-hours, 24-hours(1-day), 48-hours(2-days),
72-hours(3-days), 168-hours(1-week),
period※720-hours(1-month)※To calculate the probable precipitation with some return periods , the annual maximum values ofcumulative precipitation data is required.
Annual maximum value is the maximum precipitation observed in a year from January to December.
For example, the annual maximum 6-hours precipitation is the maximum cumulative precipitation in some
6hr precipitation during a year.

4．System configuration
 All basin page will open to entera password at the top page.
 Select the individual basin fromall basin page.
 You can switch from all basin
page to all Amphoe page.
 Select the individual Amphoe
from all Amphoe page.
 You can download thedistribution map at all basin page
and all Amphoe page.
 You can download the average
precipitation at individual basin
page and individual Amphoe
page .

5．System operation■ All basin page

Distribution map of
cumulative precipitationis shown.

Select Basin orAmphoe.
Select satellitebased precipitation.
・1 hour
・6 hours
・1 day・2 days・3 days・week・month

Click on a basin!

Select date andtime(hour) to display.

Precipitation informationis shown for theselected date/time andcumulative precipitation.

5．System operation■ Individual Basin Page
Cumulative
precipitation and hourly
precipitation are shown
on a graph.
Probable precipitationis shown in a table.
The screen
displays thesatellite-based
hourly precipitationof the selecteddate.

Cumulative precipitationis shown from the 24hr
before the selectedtime/date.
When the observed
precipitation exceeds
the probable
precipitation, the cellbecomes to be colored.

5．System operation■ All Amphoe Page

Select Basin orAmphoe.

Select satellitebased precipitation.
・1 hour
・6 hours
・1 day・2 days・3 days・week・month

Click on a Amphoe!
Select date andtime(hour) to display.

Click on an area towhich Amphoe
belongs!

5．System operation■Individual Amphoe Page
Cumulative
precipitation and hourly
precipitation are shown
on a graph.

The screen
displays thesatellite-based
hourly precipitationof the selecteddate.

Probable precipitationis shown in a table.

Cumulative precipitationis shown from the 24hr
before the selectedtime/date.
When the observed
precipitation exceeds
the probable
precipitation, the cellbecomes to be colored.

5．System operation■Data Download Page（Precipitation intensity distribution map）

Click！

Select start and end
date to download .
Click on the” Download”button!

Satellite-based
precipitation data (shp file)is downloaded.

5．System operation■Data Download Page
（river basin average precipitation/Amphoe area average precipitation）

Select start and end
date to download .
Click on the” Download”button!

Click！

Satellite-based
precipitation data (csv file)is downloaded.

6． Grasp of a long-term rain tendency by the Systemfrom July to September, 2011 monthly satellite-based precipitation
satellite-based precipitation

400

3.5

350

3.0

300

2.5

250

2.0

200

1.5

150
100

0.5

50

0.0

0
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827828
829
830
831
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930

1.0

monthly Precipitation（mm/month）

Precipitation(mm/hr)

4.0

2011

1/2 217.4mm/month

8/17 5:00
Monthly satellite-based
precipitation over 2-year
return period.

1/3 236.4mm/month

8/19 9:00
Monthly satellite-based
precipitation over 3-year
return period.

1/5 257.5mm/month

1/10 284.1mm/month

8/20 21:00
Monthly satellite-based
precipitation over 5-year
return period.

9/12 17:00
Monthly satellite-based
precipitation over 10-year
return period.

Satellite-based monthly precipitation exceeded 2-year return period in themiddle of August and 10-year return period in the middle of September.