QUALITY ASSESSMENT OF SEA LEVEL DATA by the UH SEA LEVEL CENTER/NATIONAL OCEANOGRAPHIC DATA CENTER JOINT ARCHIVE FOR SEA LEVEL updated: 19 Jun 2018 Station : Legaspi Latitude: 13 08.7N Country : Philippines Longitude: 123 45.4E JASL # : 371A Time Meridian: 120E (GMT + 8 hr) GLOSS # : 072 TOGA #: P010 NODC #: 11123301 Contributor : National Mapping Resource Information Authority Coast and Geodetic Survey Department 421 Barraca St. San Nicolas 1010 Manila, Philippines and beginning 2011: 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) 1984-2013: A.OTT, gravity type replaced with float SDR 2/2013 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: 1984-2010: OTT (2003 RAD -240mm) 2011: RAD (adjusted -240mm #) 2012: OTT 2013-2017: RAD (Jan-Mar 2013: adjusted -240mm) (May-Oct 2013: adjusted -310mm) (2014-2017: adjusted -290mm) *short gaps in primary channel filled with other channels as available; see UHSLC for specific dates #adjustments made by comparing NMRIA vs UHSLC series, adjusting UHSLC to NMRIA reference level since no staff or switch data for calibration of UHSLC series. 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 1984 - 05 Sep 2017 Gaps > 1 mon : 27 Nov 1993 - 01 Mar 1994;31 Dec 1995 - 31 Dec 1996 01 Jan 2003 - 01 Apr 2003;30 Jun 2006 - 23 Feb 2007 17 Jun 2010 - 31 Dec 2010;26 Mar 2013 - 02 May 2013 24 Oct 2013 - 22 May 2014;28 Mar 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. : YES Distribution : 1984-2017 Refernce Levl: The Datum of Observation is TSO 1947. The Reference Bench Mark is BM 2. It is at the Port of Legaspi, Legaspi City, Albay, on the concrete base of the headless monument located at the northern side of the wharf. The mark is a cross cut on top of a 9.5 mm diameter brass rod set in a drilled hole at the W corner of the base. It is 0.42 m from said corner. No inscription is on the mark. The vertical distance between the Datum of Observation and the Reference Bench Mark is -3.790 m. Based on hourly residuals and differences of daily means with Manila and Cebu, the mean level for a span during 2007 is suspiciously low. In response, this series received a temporary adjustment to the mean level of +300 mm for 23 Feb - 16Z 11 Oct 2007. This feature is under investigation by the originators. Comment : A timing offset of 30 minutes exists from 16Z 31 Jan - 15Z 11 Feb 1985. The timing has small offsets of 5-10 minutes during various periods throughout the record. 2014 has timing offset of -30 min to one hour. Otherwise the daily and monthly means do not reveal any obvious reference level changes. Significant meteorological events: period (dd/mm/yyyy) event ------------------- --------------- 12/10 - 30/10/1985 typhoons 17/10 - 20/10/1986 tropical storm 06/11 - 10/11/1986 tropical storm 18/11 - 24/11/1986 typhoon Meteorological information not provided after the period given above. The daily values agree well with AVISO altimeter. The station was moved May 2016 from Latitude: 13 08.7N Longitude: 123 45.5E to 13 08' 40.80"N 123 45' 23.92"E. CI MISSING REPLACED GAPS QUESTIONABLE YEAR (%) DATA OR BAD DATA FLUCTUATIONS ---- --- -------------------- --------------- -------------------- 1984 100 none none none 1985 100 none none 31-42 1986 100 none none 180-182 1987 100 none none 85-91,224,308,312, 330-333,337 1988 100 none none 119,293-294 1989 100 none none 31-33,43,264,267- 268,283 1990 100 none none none 1991 81 131-133,141-142,148- (00)272-(22)272 140-141 153,175-196,207-214, (08)297-(23)297 221-234,241-246,260- (05)310-(00)311 264,282-286,305-307, 344-348,354-357, 358-360 1992 99 213-216 (12)342-(19)342 none (11)343-(23)343 (13)357-(07)358 (15)359-(00)360 (16)361-(23)361 1993 90 317-318,331-365 none none 1994 83 1-60 none 1995 99 200-203,308-309 (10)346-(22)346 none (05)347-(22)347 1996 0 1-366 none none 1997 99 130-132 1998 100 none (06)061-(00)062 216-220,253 (13)253-(06)254 (12)296-(21)296 1999 97 216-217,305-313 (09)155-(22)155 108-111 (16)181-(03)182 (16)241-(05)242 (09)263-(23)263 (14)265-(22)265 (10)266-(05)267 2000 98 87-89,302-303, (04)032-(15)032 none 359-364 (05)115-(21)115 (04)128-(22)128 (06)136-(23)136 (06)351-(22)351 (04)352-(15)352 (00)356-(23)356 2001 96 6-8,62-63,83-84,90- (15)018-(23)018 323-327,363-364 91,123-125,201-204, (06)066-(00)067 272-273,293-295,327- (10)076-(23)076 329,333-334 (23)128-(08)129 (02)131-(22)131 (08)132-(22)132 (23)170-(06)171 (09)205-(00)206 (09)240-(23)240 (07)241-(22)241 (09)247-(22)247 (06)282-(23)282 (16)301-(00)302 (16)304-(23)304 (16)340-(00)341 (14)343-(07)344 (15)344-(09)345 2002 97 28-31,143-144, (12)020-(00)021 251,281,339,353-354 243-249,365 (13)023-(22)023 (16)024-(00)025 (20)026-(03)027 (15)031-(03)032 (14)048-(22)048 (13)053-(04)054 (15)059-(23)059 (11)181-(00)182 (14)196-(05)197 (03)200-(23)200 (10)201-(00)202 (15)217-(23)217 (07)229-(22)229 (07)230-(21)230 (22)232-(06)233 (16)234-(23)234 (04)242-(11)242 (01)282-(08)282 2003 73 1-91,276-283,298-301 (05)092-(22)092 none (15)189-(22)189 (16)284-(23)284 (06)355-(13)355 2004 100 none (23)016-(15)017 none 2005 99 364-365 (10)230-(01)231 none (02)250-(10)250 2006 49 181-365 (04)078-(23)078 none 2007 84 1-54,122-128 none none 2008 100 none (23)160-(09)161 1-91 (15)268-(04)269 2009 95 62-67,267-274,324- (01)237-(18)237 none 329 (16)364-(15)365 2010 46 96-98,168-36 (05)028-(17)028 none 2011 99 318-320,325-327 (11)181-(19)181 none (12)309-(00)310 (11)310-(02)311 (09)311-(02)312 (12)312-(01)313 (11)313-(01)314 (12)314-(01)315 (11)315-(01)316 (11)316-(01)317 (10)317-(01)318 (08)320-(03)321 (09)321-(02)322 (09)322-(04)323 (08)323-(04)324 (06)324-(02)325 (10)327-(02)328 (09)328-(02)329 (08)329-(04)330 (08)330-(02)331 (10)331-(02)332 (08)332-(02)333 (08)333-(04)334 (08)334-(02)335 (13)335-(00)336 (16)336-(00)337 (16)338-(05)339 (09)339-(03)340 (08)340-(01)341 (11)341-(01)342 (09)342-(04)343 (08)343-(01)344 (14)344-(00)345 (15)345-(00)346 (16)346-(00)347 (12)347-(00)348 (19)348-(02)349 (11)349-(01)350 (16)350-(00)351 (08)351-(02)352 (15)352-(00)353 (17)353-(00)354 (14)354-(04)355 (09)355-(01)356 (12)356-(01)357 (14)357-(00)358 (15)358-(01)359 (10)359-(02)360 (11)360-(01)361 (04)361-(01)362 (16)362-(00)363 (13)363-(01)364 (15)364-(00)365 2012 99 42-44 (14)005-(01)006 none (09)006-(01)007 (14)007-(02)008 (10)008-(00)009 (14)009-(01)010 (16)010-(00)011 (15)012-(00)013 (13)013-(01)014 (15)017-(01)018 (17)018-(00)019 (17)019-(00)020 (14)020-(01)021 (11)021-(00)022 (17)022-(00)023 (16)025-(00)026 (16)026-(00)027 (15)027-(00)028 (12)032-(02)033 (12)033-(01)034 (15)034-(00)035 (16)037-(00)038 (10)039-(01)040 (14)040-(00)041 (10)044-(03)045 (15)045-(00)046 (16)046-(03)047 (09)047-(01)048 (16)050-(23)050 2013 71 46-47,85-122,297-365 (13)174-(00)175 none 2014 61 1-142 (10)152-(06)153 none (14)364-(04)365 (09)365-(01)001 (11)001-(02)002 2015 100 none (10)002-(02)003 none (10)003-(01)004 (13)004-(01)005 (12)005-(00)006 (16)006-(23)006 (15)013-(23)013 2016 24 88-366 none none 2017 67 1,9-11,13-14,21-23 (08)014-(01)015 none (12)015-(00)016 (11)016-(01)017 (15)130-(23)130 (14)131-(22)131 (14)132-(22)132 (13)133-(23)133 (13)134-(22)134 (13)135-(22)135 (12)136-(22)136 (11)137-(22)137 (11)138-(23)138 (11)139-(23)139 (11)140-(22)140 (11)141-(22)141 (10)142-(23)142 (10)143-(01)144 (10)144-(23)144 (08)145-(22)145 (09)146-(22)146 (10)147-(22)147 (10)148-(22)148 (10)149-(22)149 (10)150-(22)150 (10)151-(22)151 (09)152-(22)152 (09)153-(22)153 (10)154-(22)154 (09)155-(22)155 (10)156-(00)157 (10)157-(00)158 (10)158-(00)159 (07)159-(00)160 (08)160-(23)160 (10)161-(22)161 (09)162-(22)162 (10)163-(22)163 (10)164-(22)164 (10)165-(22)165 (10)166-(22)166