Basic Levelling Survey - Comparison Spreadsheet
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© 2013 - 2016 Myrddyn Phillips. Non-commercial copying is permitted provided attribution is preserved. Re-use of the presented data in this or another format requires the permission of the blog author.
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Contains OS Data © Crown copyright and database rights 2016, licensed under the OGL (see at http://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/ ).
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Date Accurately SurveyedDate (BLS)NameHeight (m)1:50,000 Map1:25,000 MapGrid ReferenceDrop (Basic Levelling Survey) (ft)Drop (Basic Levelling Survey) (m)Drop (spot heights on OS map) (m)Drop (Line Survey) (m)Drop (GPS / GNSS Receiver) (m)Leica Disto (m)Distance from Bwlch to Summit (m)Status (surveyed for)Comments
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01/07/201713/09/2005Pt. 548.6m* 548.612418SH 743 39349ft 6˝15.1No summit or bwlch spot heightNot Surveyed* 16.2Not Surveyed120UchafSurveyed by Trimble GeoXH 6000
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01/07/201715/07/2000Foel Cynfal* 545.512418SH 749 39593ft 6˝28.5No OS summit or bwlch spot heightNot Surveyed* 28.1Not Surveyed110Dewey, TwmpauSurveyed by Trimble GeoXH 6000
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01/07/201713/09/2005Pen y Foel Ddu* 531.212418SH 753 39450ft 6˝15.4No bwlch spot heightNot Surveyed* 16.6Not Surveyed170UchafSurveyed by Trimble GeoXH 6000
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19/10/201628/10/2001Cefn Coch 592.612523SH 923 26610331.429Not Surveyed31.2Not Surveyed360Dewey, TwmpauSurveyed by Trimble GeoXH 6000
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19/10/201621/05/2004Foel y Groes580.912523SH 918 2357221.9No bwlch spot heightNot Surveyed20.4Not Surveyed330Sub-TwmpauSurveyed by Trimble GeoXH 6000
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18/07/1611/7/2000Esgair y Maesnant503.5135, 136214SN 832 86295ft 6˝29.126Not Surveyed27.3Not Surveyed460Dewey, TwmpauSurveyed by Trimble GeoXH 6000
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13/5/201611/7/2000Bryn yr Ŵyn499.9135, 136214, 215SN 839 925106ft 6˝32.5No summit or bwlch spot heightNot Surveyed28.7Not Surveyed1095Dewey, TwmpauSurveyed by Trimble GeoXH 6000 and height averaged from five surveys conducted over two days. Drop given from Esgair Greolen bwlch
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5/5/201611/7/2000Bryn yr Ŵyn499.9135, 136214, 215SN 839 925106ft 6˝32.5No summit or bwlch spot heightNot Surveyed28.7Not Surveyed1095Dewey, TwmpauSurveyed by Trimble GeoXH 6000 and height averaged from five surveys conducted over two days. Drop given from Esgair Greolen bwlch
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13/05/1611/7/2000Esgair Greolen501.4135, 136214, 215SN 835 920102ft 6˝31.2No summit or bwlch spot heightNot Surveyed30.3Not Surveyed355Dewey, TwmpauSurveyed by Trimble GeoXH 6000 and height averaged from four surveys conducted over two days
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5/5/201611/7/2000Esgair Greolen501.4135, 136214, 215SN 835 920102ft 6˝31.2No summit or bwlch spot heightNot Surveyed30.3Not Surveyed355Dewey, TwmpauSurveyed by Trimble GeoXH 6000 and height averaged from four surveys conducted over two days
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5/5/201622./05/2004Graig Fach513.1135, 136214, 215SN 821 93156ft 6˝17.2No bwlch spot heightNot Surveyed14.5Not Surveyed260Pellennig, UchafSurveyed by Trimble GeoXH 6000
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8/4/201615/12/3003Pt. 408m407.7136, 138200SO 180 69298ft 6˝30No bwlch spot heightNot Surveyed29.4Not Surveyed255PedwarHill with three potential bwlch positions, only two were BLS'ed. Drop value from bwlch at SO 18002 69004. Critical bwlch placed at SO 18847 70099.
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8/4/201615/12/3003Pt. 408m407.7136, 138200SO 180 69210231.1No bwlch spot heightNot Surveyed28.1Not Surveyed675PedwarHill with three potential bwlch positions, only two were BLS'ed. Drop value from bwlch at SO 18397 69858. Critical bwlch placed at SO 18847 70099.
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25/03/201611/7/2003Moel y Llan405.312418SH 753 24110832.9No summit or bwlch spot heightNot Surveyed33.1Not Surveyed160PedwarSurveyed by Trimble GeoXH 6000
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25/03/201611/7/2003Cerniau411.712418SH 756 24111234.1No bwlch spot heightNot Surveyed32.9Not Surveyed470PedwarSurveyed by Trimble GeoXH 6000
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14/03/20166/1/2004Craig y Garreg-lwyd473.412418SH 730 4279930.235Not Surveyed29.9Not Surveyed200PedwarSurveyed by Trimble GeoXH 6000
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12/3/201613/05/05Drysgol483.5136, 147214SN 946 74410231.127Not Surveyed29.2Not SurveyedN/APedwarSurveyed by Trimble GeoX 6000. BLS consisted of sighting from bwlch to where the 457m spot height appears at a fence junction and adding 27m on to the result.
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2/10/20157/12/2003Y Gesail485.112518SH 926 437100ft 6˝30.633Not Surveyed32.7Not SurveyedN/APedwarSurveyed by Trimble GeoXH 6000. BLS consisted of sighting from bwlch in south-westerly direction toward the 455m summit of Pen y Ffordd Goch (SH 920 427), then measuring up to bwlch, which is approximately 2ft higher than the summit of Pen y Ffordd Goch.
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7/9/201516/10/2003Banc Bronderwgoed404.1135, 136215SN 871 9879930.228Not Surveyed27.7Not Surveyed325PedwarIncluded in Y Pedwarau due to basic levelling survey. Reclassified to Sub-Pedwar due to Trimble GeoXH 6000 survey.
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7/9/201516/10/2003Llannerch yr Aur437.3135, 136215SN 863 97811434.7No bwlch spot heightNot Surveyed34Not Surveyed400PedwarSurveyed by Trimble GeoXH 6000
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7/9/201516/10/2003Bryn y Fedwen404.8135, 136215SN 851 97210632.332Not Surveyed31.5Not Surveyed300PedwarSurveyed by Trimble GeoXH 6000
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16/06/201518/04/1998, 22/08/98 and 13/09/1998Pt. 650m649.711517, 18SH 660 4525015.2No summit or bwlch spot height14.7714.77Not Surveyed60Nuttall (did not qualify)Average of three basic levelling surveys conducted over three separate visits
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7/6/201513/07/2003Belan412126240, 255SJ 222 3249930.2No bwlch spot heightNot Surveyed29.8Not Surveyed285PedwarHill qualifies for Pedwar status as bwlch at SJ 22498 32561 is lower. BLS taken from slightly higher bwlch position.
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22/05/201511/1/1999Waun Camddwr621.7124, 12523SH 848 207 SH 847 205 (twin summits)5316.15No bwlch spot height15.46415.445Not surveyed250NuttallLine survey could not differentiate between moorland and rocky summit. With one 4mm higher and then the other 2mm higher. Only moorland summit surveyed with the Leica GS15.
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21/09/20148/4/2003Pt. 497m49712418SH 661 303102ft 6˝31.2No bwlch spot heightNot surveyed31.8Not surveyed150PedwarIncluded in Y Pedwarau due to basic levelling survey. Surveyed by Trimble GeoXH 6000.
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9/9/20145/6/2000Llechog71811517SH 606 56797ft 6˝29.7No bwlch spot heightNot surveyed28Not surveyed155Hewitt (did not qualify)Surveyed by Trimble GeoXH 6000. Llechog was the only hill I ever surveyed by BLS for Hewitt status
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18/05/201413/09/2002Foel Uchaf52213523, 215SN 768 92579ft 6˝24.2No bwlch spot heightNot surveyed22.9 (23.7m; see note in comment column)Not surveyed100DeweySurveyed by Trimble GeoXH 6000. Surveyed from bwlch at SN 767 925 which is not the critical bwlch (SN 768 922), surveyed drop to BLS bwlch is 23.7m.
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11/01/2014 and 13/03/201423/09/2003Cefn Perfa411.2148200SO 173 5799729.6No bwlch spot height30.0630.04 / 30.07 / 30.06Not Surveyed240PedwarSurveyed by Trimble GeoXH 6000 (twice) and Leica GS15 GNSS
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8/3/201428/04/2000Pt. 564m564.3124, 12523SH 809 17211535.131Not Surveyed33.8Not Surveyed200DeweyIncluded in Dewey list due to basic levelling survey. Named as Pen Ochr y Bwlch in the Deweys list. Surveyed by Trimble GeoXH 6000.
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4/3/201417/09/2003Tylcau Hill485.8136, 148214SO 141 76211635.434Not Surveyed32.2Not Surveyed625 (see note in comment column)PedwarSurveyed by Trimble GeoXH 6000. BLS distance taken from connecting bwlch between Warren Hill and Newhouse Hill to latters summit.
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4/3/201417/09/2003Newhouse Hill485.6136, 148214SO 142 76891ft 6˝27.929Not Surveyed28.3Not Surveyed350Pedwar (did not qualify)Surveyed by Trimble GeoXH 6000
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1/3/20142/8/2003Pt. 477m474.212418SH 759 379110 (see note in comment column)33.5 (see note in comment column)No summit or bwlch spot heightNot Surveyed33.9 (see note in comment column)Not Surveyed175PedwarSurveyed by Trimble GeoXH 6000. Drop value given to connecting bwlch at SH 757 378 (not critical bwlch).
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22/02/201323/07/2000Moel y Gyrafolen536.7512418SH 672 35210030.5No bwlch spot heightNot Surveyed30.12Not Surveyed175DeweyIncluded in Dewey list due to basic levelling survey. Surveyed by Leica GS15 GNSS.
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16/02/201230/04/2000Stanky Hill506.6136, 148214SO 163 76410331.42930.3130.3Not Surveyed475DeweyIncluded in Dewey list due to basic levelling survey. Surveyed by Leica 530 GPS.
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02 and 08/02/20127/7/2000Lledwyn Mawr52612523SH 905 28799ft 6˝30.329Not Surveyed30.9Not Surveyed400DeweyIncluded in Dewey list due to basic levelling survey
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27/10/201027/10/2001Cerrig yr Ieirch51112418SH 758 42510030.5No bwlch spot heightNot Surveyed29.2Not Surveyed475 (see note in comment column)Dewey (deleted from list)Included in Dewey list due to a basic levelling survey. Surveyed by Leica 530 GPS. BLS conducted from c 500 fence junction at SH 772 411 to boundary stone near 490m contour at SH 769 415.
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21/04/20101/5/1998Tryfan Far South Peak830.811517SH 663 59145ft 1½˝13.75No bwlch spot heightNot Surveyed13.1Not Surveyed25Nuttall (did not qualify)Surveyed by Leica 530 GPS
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16/03/20105/5/2000Y Blaen Llym55411517SH 685 46410030.52830.55Not SurveyedNot Surveyed275DeweyIncluded in Dewey list due to basic levelling survey. Also listed as Craig Nyth-y-gigfran.
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11/3/20105/5/2000Iwerddon58311517SH 688 48210030.52425.23Not SurveyedNot Surveyed525Dewey (deleted from list)Included in Dewey list due to basic levelling survey
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19/02/201022/07/2000Pt. 524m524135, 136213, 214SH 802 82810030.5No bwlch spot height30.6Not SurveyedNot Surveyed250DeweyIncluded in Dewey list due to basic levelling survey. Named as Cripiau South Top in the Deweys list.
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10/2/201019/09/2002Glanfeinion Hill534.9136214SO 033 8469729.6No bwlch spot heightNot Surveyed28.4Not Surveyed75 (see note in comment column)Dewey (did not qualify)Surveyed by Leica 530 GPS. BLS conducted from critical bwlch to c 510 contour at SO 031 830.
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2/7/200920/03/1998, 03/09/1998, 16/09/1998 and 26/10/1998 Waun Garnedd-y-filiast65011618SH 874 45251ft 10˝15.8No bwlch spot height15.13Not SurveyedNot Surveyed150NuttallAverage of seven basic levelling surveys conducted over four separate visits
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2/4/20093/8/2000Craig Wen604.8811517SH 597 5088124.7No bwlch spot height25.325.3Not Surveyed350Dewey (did not qualify)Surveyed by Leica 530 GPS
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26/01/200927/10/2001Craig y Benglog525.24124, 12523SH 805 24411033.5No summit or bwlch spot height32.632.57Not Surveyed100DeweyIncluded in Dewey list due to basic levelling survey
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30/06/200821/08/2002Pt. c 500mc 500135, 136, 147214SH 863 76097ft 6˝29.7No summit or bwlch spot height27.9Not SurveyedNot Surveyed275Dewey (did not qualify)Named as Glan Fedwen in the Deweys list
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30/06/200819/09/2002Domen Ddu553136, 147214SO 016 7828124.72424.3Not SurveyedNot Surveyed905Dewey (deleted from list)Included in Dewey list due to hand-help GPS value
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22/04/200816/06/2000Carreg y Foel Gronc 50012418SH 744 4278626.2No summit or bwlch spot height26.2Not SurveyedNot Surveyed125Dewey (did not qualify)
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31/03/2008 and 25/11/200821/07/2000 and 27/10/2001Pt. 572m572.212418, 23SH 780 35611234.1No summit or bwlch spot height34.1434.04Not Surveyed225DeweyIncluded in Dewey list due to basic levelling survey. Named as Moel yr Wden in the Deweys list.
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3/11/20077/5/2000Mynydd Ceiswyn60512423SH 772 13995292727.4Not SurveyedNot Surveyed625Dewey (deleted from list)Included in Dewey list due to hand-help GPS value
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18/10/200704/06/1998, 18/08/1998 and 18/10/2007Clogwyn Llech Lefn63711517SH 709 6274714.3No bwlch spot height14Not SurveyedNot Surveyed150Nuttall (did not qualify)Average of four basic levelling surveys conducted over three separate visits
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8/10/200701/06/1998, 02/09/1998 and 08/01/2007Cynefin Bryn-blewc 71012423SH 784 25449ft 2˝15706m bwlch spot height14.59Not SurveyedNot Surveyed112Nuttall (did not qualify)Average of four basic levelling surveys conducted over three separate visits
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24/07/200730/08/1998 and 03/10/1998Castell y Gwynt97211517SH 654 58150ft 11˝15.5No bwlch spot heightNot SurveyedNot Surveyed15.9537NuttallAverage of two basic levelling surveys conducted over two separate visits
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14/07/200725/04/1998Llechwedd Llwyd643125255SJ 042 29544ft 3˝13.51412.7Not SurveyedNot Surveyed212Nuttall (did not qualify)Named as Bryn Gwyn in Nuttalls 'Deleted Tops' list
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26/05/200703/10/1998 and 29/04/1999Fronllwyd72111517SH 617 63150ft 3˝15.3No bwlch spot height16.14Not SurveyedNot Surveyed175NuttallAverage of three basic levelling surveys conducted over two separate visits. Named as Carnedd y Filiast North Top in the Nuttalls list.
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Date unknown (pre 1997)29/01/1998 and 19/03/1998Pt. 688m68811517SH 648 46864ft 4˝19.6No bwlch spot height19.8Not SurveyedNot Surveyed225NuttallAverage of two basic levelling surveys conducted over two separate visits. Named as Cnicht North Top in the Nuttalls list.
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