HAR rain gauge network (in this case HAR=Harris County) 1720 rain gauge ID 01 Year 2001 gmin product IDFile header GMIN HSTN HAR 1720 Q100_Cedar TIP 1.0 29.76944 -94.91750 KHGX 36.72 25.29 83 92 -99.9
GMIN HAR 1720: same as in file name
HSTN GV site
Q100_Cedar name of rain gauge location
TIP rain gauge type: tipping bucket
1.0 resoultion: 1 minute
29.76944 latitude in degree
-94.91750 longitude in degree
KHGX primary radar
36.72 range, i.e. distance between primary radar and gauge
25.29 azimuth between primary radar and gauge
Azimuth is a direction in terms of the 360 degree compass;
north at 0, east at 90, south at 180, west at 270, etc.
83 gauge coordinate in pixel at X axis
92 gauge coordinate in pixel at Y axis
Radar location is at center pixel (75,75);
Pixel (0,0) is at the SW corner. One pixel is 2kmX2km.
-99.99 radar elevation above sea level. (-99.9 not available)
Data format
......................................
01 160 05 52 00 -18.67 3 1.11 10
01 160 05 53 00 -12.47 3 1.11 10
01 160 05 54 00 -7.57 3 1.11 10
01 160 05 55 00 -3.96 3 1.11 10
01 160 05 56 00 -1.64 3 1.11 10
01 160 05 57 00 -0.62 3 1.11 10
01 160 05 58 00 -0.84 3 1.11 10
01 160 05 59 00 -1.57 3 1.11 10
......................................
There are 9 data fields.
1) year
2) Julian Day
3) hour in UTC
4) minute
5) second (always zero)
6) rain rate in mm/hr
negative indicates low data quality due to interpolation for Type 1,2,3 as defined in 7)
e.g. Rain rate is 18.67 mm/hr from 5:51:00 to 5:51:59 on Julian day 160, 2001.
7) Type of Event
event: series of tips in which each tip in the series is temporally related
to the an antecedant or subsequent tip by 30 minutes or less
0 = normal spline interpolation, no "-" sign, good data quality;
1 = single isolated tip event;
2 = two single tip event (non-mulitple tip) or one isolated double tip event;
3 = multiple tip event ( >=3 tips in the event, at least one record has 2 or more tips)
8) Rainfall bias by event
Bias = Raw Event Accumulation/Integrated Rain Rates (as derived from spline interpolation)
9) Number of tips in a given rain event (as defined in 7)
Since Mar 7, 2003, we have released version-4 2A56 files.
The definition of rain event is changed from 30 minutes to 15 minutes.
The format for version-4 2A56 files is the same as version 3.
But the format for new version GMIN files is different.
e.g.
...............................................
2003 02 21 052 10 58 00 -12.01 1 1.00 1
2003 02 21 052 10 59 00 -12.01 1 1.00 1
2003 02 21 052 18 52 00 28.64 0 1.05 9
2003 02 21 052 18 53 00 28.64 0 1.05 9
2003 02 21 052 18 54 00 27.18 0 1.05 9
2003 02 21 052 18 55 00 24.27 0 1.05 9
2003 02 21 052 18 56 00 19.90 0 1.05 9
2003 02 21 052 18 57 00 14.07 0 1.05 9
...............................................
There are 11 data fields.
1) year
2) month
3) Day of the month
4) Julian Day
5) hour in UTC
6) minute
7) second
8) rain rate in mm/hr
negative indicates low data quality due to interpolation for 1-minute rain event.
9) Type of interpolation for different rain events
event: series of tips in which each tip in the series is temporally related to the an antecedant or subsequent tip by 15 minutes or less
0 = normal spline interpolation for event duration > 1 min;
1 = evenly spread 1-minute event rain into 5-min interval, flagged with "-" for one-minute rain event;
2 = linear interpolation when spline interpolation bias>1.5 or <0.5.
10)Rainfall bias by event
Bias = Integrated Rain Rates (as derived from above interpolation)/Raw Event Accumulation
11) Number of tips in a given rain event (as defined in 9)