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)