Accuracy Assessment Of Geospatial Data For Cadastral Application A Case Of Addis Ababa City Ethiopia

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Datum transformation is the transformation of coordinate points from one known coordinaternreference system into another. The recent practice of geospatial data collection, management,rnand analysis in Ethiopia is in geocentric coordinates of a point defined based on a global datumrn(WGS84). However, Ethiopia uses Adindan as the recognized local datum. The current officialrntransformation parameters in use by Ethiopia are slightly different from the parametersrndetermined by previous research and adopted in widely used geospatial software packages. Inrnaddition to this, the rotation and scale changes are ignored in the transformation parameters.rnThe current practice of cadaster in Addis Ababa city is below the accuracy level of all local andrnglobal geospatial data standard guidelines. The main purpose of this study is to assess andrnevaluate the Accuracy Assessment of Geospatial Data for Cadastral Application: A Case ofrnAddis Ababa City, Ethiopia. Statistical analyses have been done for second-order GCP,rnorthophoto, and cadastral parcel accuracy assessment analysis based on ASPRS 2014rnstandards. The positional accuracy of second-order ground control points, orthophoto, andrncadastral parcels evaluated by checkpoints is determined as 0.47m, 1.326m, and 1.87mrnrespectively at a 95 % confidence level. Finally, the software packages used to convert fromrnglobal to local reference datum differ from one another, causing major changes in the values ofrnspecific points. Coordinates values of Orthophoto and static GCPs were converted from WGS84rnto Adindan using (X = 162m, Y = 12m, and Z = -206m); the RMS error of easting and northingrnvalues were 0.32 m and 0.69 m respectively. On the other hand, the static GCPs coordinatesrnwere converted by using (X = 165 m, Y =11 m, and Z = -206 m) and compared with orthophotorncoordinates, the RMS error of easting and northing values were 2.65 m and 0.78 m respectively.rnAnd, according to Molodensky-Badekas seven transformation parameters using (169.674 m inrnX, 14.801m in y, and -204.841 in Z), the RMS error of easting and northing values were 3.055mrnand 0.697 m respectively. Finally, the researcher recommends these parameters shall utilize asrnunique and constant values to improve data integrity for geospatial work such as cadastralrnapplication.

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Accuracy Assessment Of Geospatial Data For Cadastral Application A Case Of Addis Ababa City Ethiopia

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