A NEW HEIGHT DATUM FOR UGANDA

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Presentation transcript:

A NEW HEIGHT DATUM FOR UGANDA The 3rd Conference on Advances in Geomatics Research 6th-7th August Kampala 2015 A NEW HEIGHT DATUM FOR UGANDA Ronald Ssengendo1,2, Lars.E. Sjöberg2, Anthony Gidudu1 1 CEDAT, Makerere University 2 Royal Institute of Technology, Division of Geodesy, SE-100 44 Stockholm, Sweden

outline Introduction- geoid/quasigeoid, GNSS height determination Uganda Vertical Network- current status UGG2014 & UGQ 2014- determination & evaluation Determination of the New height datum-UGQ2014C Evaluation of UGQ2014C Conclusions & way forward

Introduction Need for geoid/quasigeoid model?---GNSS-HEIGHT DETERMINATION

Uganda Vertical Network

Uganda Vertical Network Status Number of points Stations Good condition 14 Buteba, Jinja, Mbarara, Kasese, Fortportal, Mabale, Mubende, Kiboga, Rhino Camp, Kabale, Ishasha, Yumbe, Pakelle, Nakalama Partially destroyed 2 Packwach and Bukonte Not sure 22 Dokolo, Soroti, Abella, Nakasongola, Hoima, Busunju, Hamurwa, Kikarara, Kyenjojo, Kibaliga, Tororo, Karuma, Okollo, Laropi, Pabo, Achwa, Nkonge, Mutir,Anaka, Kanungu and Koputh

Uganda Vertical Network

Uganda Vertical Network

Uganda Gravimetric Geoid Model 2014 (UGG2014) UGG 2014 computed by Ssengendo et al., (2015a)-KTH Method

Uganda Gravimetric Geoid Model 2014 (UGG2014) UGG 2014 computed by Ssengendo et al., (2015a)-KTH Method Data used for the determination of the geoid model 7839 terrestrial gravity data from BGI World Gravity Map 2012 surface gravity anomalies –BGI SRTM3 DEM—CGIAR-CSI GOCE-only GGM—GO_CONS_GCF_2_TIM_R5 (maximum degree=280) 10 GNSS/levelling points

Uganda Gravimetric Quasigeoid Model 2014 (UGQ2014) Uganda Vertical Network – normal-orthometric heights UGQ2014 determined indirectly from UGG2014

Evaluation of UGG2014/UGQ2014—GNSS/levelling Modelling options – systematic biases

Evaluation of UGG2014/UGQ2014—GNSS/levelling Results -- Statistics of residuals at 12 GNSS/levelling points (Unit: cm) Model Min. Max. Mean Std. RMS UGG2014 before -14.6 36.8 9.3 13.2 15.7 4-parameter -15.6 13.6 0.0 9.1 8.7 5-parameter -21.3 30.1 12.2 11.7 UGQ2014 -30.5 14.6 -8.6 12.8 14.9 -17.5 14.4 8.1 7.7 -15.7 13.4 6.7 6.4

Determination of the new height datum-UGQ2014C New height datum – combination of UGQ2014 & GNSS/levelling

Determination of the new height datum-UGQ2014C New height datum – corrector surface determined by the Kriging method

Determination of the new height datum-UGQ2014C

Validation of the new height datum-UGQ2014C Absolute heights (Unit : cm) Relative heights Model Min. Max. Mean Std. RMS UGQ2014 -5.2 30.5 9.0 15.4 16.1 UGQ2014C -12.6 16.6 -1.6 12.6 11.1

Conclusion & way forward Conclusions Results satisfy the requirements for third order precise levelling GNSS observations coupled with the new datum can be used to replace spirit levelling in most engineering applications UGQ2014C provides a practical solution to the GNSS/levelling problem However heterogeneous distribution of terrestrial gravity data– to achieve the ‘1 cm geoid’ homogeneous network of GNSS/levelling benchmarks--improve the fit between the gravimetric solutions and GNSS, hence improving the new height datum

THANK YOU