QUALITY ASSESSMENT OF SEA LEVEL DATA by the UH SEA LEVEL CENTER/NATIONAL OCEANOGRAPHIC DATA CENTER JOINT ARCHIVE FOR SEA LEVEL updated: 14 Nov 2019 Station : Davao-B Latitude: 07 09.2N Country : Philippines Longitude: 125 39.8E JASL # : 372B Time Meridian: 120E (GMT + 8 hr) GLOSS # : 071 Originator #: DV NODC #: 10127501 Contributor : National Mapping Resource Information Authority Coast and Geodetic Survey Department 421 Barraca St. San Nicolas 1010 Manila, Philippines and beginning 2007: UH Sea Level Center (UHSLC) University of Hawaii at Manoa Honolulu, Hawaii 96822 USA Originator : same Original Data: analog (OTT) and digital (others) Instrmnt Type: 1) 1998-2011: A.OTT, gravity type 2) 02/2007- radar (RAD) gauge (Vega Vegapuls 62) 3) 02/2007- pressure transducer (PRS) 4) 10/2009- radar (RA2) Sutron RLR Primary channel used in JASL set: 1998-2006: OTT 2007-2018: RAD *short gaps in primary channel filled with other channels as available; see UHSLC for specific dates Digitzd Intvl: spot hourly (Ott); 3 min RAD, RA2; 2 min PRS Present Data : Hourly, daily, and monthly values obtained by: Hourly : The original digitizing interval was hourly (OTT) 3-pt Hanning filter centered on the hour (others) Daily : 119-point convolution filter (Bloomfield, 1976) centered on noon applied to the hourly data with respective periods of the 95, 50, and 5% amplitude points at 124.0, 60.2, and 40.2 hours Monthly: Simple average of all daily values; calculated if 7 or fewer days are missing Span of data : 01 Jan 1998 - 31 Dec 2018 Gaps > 1 mon : 28 Feb 1998 - 31 Mar 1998;30 Sep 1998 - 07 Nov 1998 31 Dec 1998 - 25 May 2000;17 Feb 2001 - 21 Mar 2001 31 Jul 2001 - 02 Sep 2001;03 Dec 2001 - 01 Jan 2004 18 Mar 2004 - 24 Apr 2004;15 Jan 2006 - 28 Mar 2006 29 Jun 2006 - 02 Oct 2006;31 Dec 2006 - 26 Feb 2006 21 Aug 2009 - 24 Sep 2009;17 May 2016 - 01 Jan 2017 Time Refernce: GMT (hours 00-23) Space-filler Flag :-9999 Units : millimeters Missing Data Flag : 9999 Existing : Yes Operational : Yes Sat. Trans. : No Distribution : 1998-2018 Refernce Levl: The series is broken into Davao-A and Davao-B since there is an apparent change to the mean level between the segments. Hourly residuals and daily differences with Manila and Legaspi led to a mean level adjustment with +/- 5 cm uncertainty: period value added ( (hour)day/month/year ) to original(mm) ------------------------------ --------------- (16)31/12/2000 - (23)03/12/2001 +700 Reference level zero is the UHSLC zero defined for the 2007-2017 data. The historic data 1998-2009 were adjusted to the UHSLC zero by adding 1055 mm. UHSLC Reference level: Heights are referred to the station tide staff zero, which is linked to land-based benchmarks. This reference zero is unique to this station and is not an official datum (chart, national, etc.) and is not relative to local tidal parameters, such as mean lower low water. See the Originators for benchmark descriptions, maps, and the geodetic levelling history. Comment : Some long spells of missing data. Comparison with AVISO suggests reference level calibration quality is low with segments 1998-2001 and 2004- 2006 slightly offset. Use with caution prior to 2007. Numerous consecutive days with short gaps 2007-2010 have been interpolated. The station was moved May 2016 from Latitude: 07 07.3N Longitude: 125 39.8E to 07 09' 13.32"N 125 39' 46.51"E. JASL Nov 2019 update replaces 2015- 05 Sep 2017. CI MISSING REPLACED GAPS QUESTIONABLE YEAR (%) DATA OR BAD DATA FLUCTUATIONS ---- --- -------------------- --------------- -------------------- 1998 70 59-90,213-244,273- none 354-255 311,336-341,365 1999 0 1-365 none none 2000 60 1-146 none none 2001 68 48-80,111-134, none 138-336 212-245,337-365 2002 0 1-365 none none 2003 0 1-365 none none 2004 83 78-115,317-343 (09)011-(16)011 none 2005 98 75-76,219-220, (21)168-(07)169 none 271-278 (16)364-(15)365 2006 54 15-87,180-275,365 none none 2007 85 1-54,308-309 (07)348-(15)348 none 2008 100 none (09)185-(16)185 none (00)262-(09)262 (01)288-(09)288 (01)292-(08)292 (00)315-(08)315 (02)316-(09)316 (01)318-(08)318 (02)321-(09)321 (01)322-(09)322 (01)323-(08)323 (01)331-(08)331 (01)332-(08)332 (01)334-(09)334 (00)335-(08)335 (00)338-(08)338 (00)339-(07)339 (01)342-(09)342 (00)343-(09)343 (00)344-(09)344 (01)348-(10)348 (00)349-(09)349 (00)350-(09)350 (01)351-(09)351 (02)355-(09)355 (01)356-(09)356 (01)001-(09)001 2009 77 122-124,182-195,199- (01)002-(08)002 none 216,233-267,330-335, (01)003-(08)003 350-365 (01)004-(08)004 (01)005-(09)005 (01)006-(09)006 (00)007-(09)007 (01)009-(09)009 (01)010-(09)010 (02)018-(09)018 (01)019-(10)019 (01)020-(09)020 (01)021-(09)021 (01)022-(09)022 (01)025-(09)025 (01)026-(08)026 (00)027-(09)027 (01)028-(09)028 (01)029-(10)029 (01)030-(09)030 (02)035-(09)035 (02)036-(09)036 (01)038-(08)038 (02)041-(09)041 (00)042-(09)042 (01)047-(09)047 (01)048-(09)048 (00)049-(08)049 (00)050-(10)050 (02)051-(09)051 (01)052-(10)052 (01)054-(09)054 (01)060-(08)060 (02)061-(09)061 (01)062-(10)062 (00)064-(09)064 (01)066-(11)066 (23)066-(09)067 (00)068-(08)068 (01)069-(09)069 (01)070-(09)070 (01)073-(09)073 (23)073-(09)074 (00)075-(10)075 (23)076-(08)077 (01)078-(09)078 (01)081-(10)081 (01)082-(10)082 (00)083-(10)083 (00)084-(10)084 (00)085-(11)085 (00)086-(10)086 (00)087-(09)087 (00)088-(09)088 (00)089-(08)089 (01)090-(09)090 (02)091-(10)091 (00)092-(10)092 (01)094-(09)094 (01)095-(09)095 (00)097-(09)097 (02)098-(09)098 (01)100-(08)100 (01)101-(08)101 (00)102-(07)102 (00)103-(08)103 (02)104-(10)104 (00)105-(08)105 (00)106-(09)106 (19)106-(09)107 (01)108-(08)108 (00)111-(09)111 (01)112-(10)112 (00)113-(08)113 (00)114-(09)114 (01)115-(08)115 (00)117-(09)117 (00)118-(08)118 (01)119-(09)119 (00)120-(10)120 (00)121-(10)121 (23)121-(10)122 (00)125-(09)125 (00)126-(08)126 (00)127-(08)127 (01)128-(09)128 (00)129-(08)129 (00)130-(07)130 (00)131-(07)131 (02)133-(09)133 (02)134-(10)134 (23)134-(08)135 (23)135-(08)136 (00)139-(08)139 (00)140-(08)140 (00)141-(09)141 (00)142-(10)142 (00)143-(10)143 (23)143-(09)144 (00)145-(09)145 (00)146-(10)146 (23)146-(08)147 (01)148-(09)148 (00)149-(08)149 (00)150-(07)150 (00)151-(09)151 (01)152-(10)152 (23)152-(10)153 (23)153-(08)154 (00)155-(10)155 (23)155-(09)156 (21)336-(20)337 (06)342-(17)342 (13)343-(20)343 2010 85 1-6,9-37,40-59,60-62 (01)039-(11)039 none 2011 99 163-164 (01)165-(08)165 none (11)181-(18)181 2012 100 none none none 2013 100 none (01)049-(08)049 none (13)174-(23)174 2014 100 none (14)079-(23)079 none 2015 100 none (20)310-(03)311 none 2016 32 80-82,97-99,107-112, (14)060-(01)061 none 117-120,123-131,134- (14)061-(01)062 138 (13)062-(01)063 (13)063-(07)064 (12)064-(02)065 (14)065-(01)066 (12)066-(01)067 (12)067-(01)068 (13)068-(04)069 (12)069-(02)070 (13)070-(03)071 (09)071-(03)072 (11)072-(01)073 (13)073-(02)074 (11)074-(02)075 (13)075-(02)076 (13)076-(03)077 (12)077-(02)078 (12)078-(02)079 (11)079-(03)080 (12)082-(02)083 (11)083-(02)084 (13)084-(01)085 (11)085-(03)086 (12)086-(01)087 (11)087-(03)088 (12)088-(04)089 (11)089-(03)090 (12)090-(03)091 (12)091-(02)092 (11)092-(08)093 (11)093-(07)094 (10)094-(03)095 (11)095-(03)096 (11)096-(06)097 (08)099-(02)100 (09)100-(03)101 (10)101-(02)102 (10)102-(02)103 (11)103-(01)104 (10)104-(01)105 (10)105-(02)106 (10)106-(04)107 (11)109-(04)110 (10)112-(03)113 (10)113-(05)114 (10)114-(02)115 (10)115-(06)116 (09)116-(07)117 (10)120-(02)121 (07)121-(03)122 (10)122-(04)123 (06)128-(05)129 (09)131-(03)132 (10)132-(05)133 (09)133-(04)134 (08)001-(23)001 2017 99 1,163-165 (15)002-(23)002 237-240 (14)005-(23)005 (10)006-(01)007 (09)007-(23)007 (15)008-(22)008 (16)021-(23)021 (15)023-(01)024 (10)024-(22)024 (08)027-(22)027 (12)028-(23)028 (13)035-(23)035 (10)046-(01)047 (12)047-(00)048 (16)049-(23)049 (16)051-(23)051 (09)062-(23)062 (14)063-(23)063 (16)064-(03)065 (05)065-(23)065 (13)066-(22)066 (10)067-(22)067 (08)068-(23)068 (13)069-(22)069 (09)070-(23)070 (09)071-(23)071 (11)072-(00)073 (12)073-(23)073 (13)074-(22)074 (14)075-(23)075 (11)087-(22)087 (12)088-(22)088 (13)090-(23)090 (10)095-(22)095 (15)100-(23)100 (15)103-(22)103 (13)107-(23)107 (15)108-(23)108 (13)111-(22)111 (15)114-(22)114 (16)115-(23)115 (12)117-(23)117 (14)118-(23)118 (13)119-(22)119 (10)120-(01)121 (07)121-(23)121 (07)122-(00)123 (11)123-(02)124 (11)124-(01)125 (08)125-(23)125 (09)126-(02)127 (09)127-(00)128 (08)128-(23)128 (06)129-(23)129 (08)130-(23)130 (07)131-(23)131 (08)132-(23)132 (08)133-(02)134 (08)134-(23)134 (08)135-(00)136 (12)136-(01)137 (14)137-(02)138 (13)138-(02)139 (13)139-(22)139 (12)140-(23)140 (11)141-(23)141 (08)142-(03)143 (08)143-(03)144 (09)144-(00)145 (08)145-(03)146 (15)146-(23)146 (10)147-(03)148 (13)148-(23)148 (13)149-(22)149 (06)150-(03)151 (11)151-(22)151 (12)152-(01)153 (09)153-(23)153 (09)154-(23)154 (12)155-(02)156 (08)156-(23)156 (09)157-(03)158 (08)158-(23)158 (07)159-(03)160 (06)160-(02)161 (09)161-(03)162 (11)162-(01)163 2018 100 none none none