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...Province of british columbia bc guidelines for rtk gps surveys including operating within a municipal active control system m area acs version november table contents list figures ii appendices introduction description accuracy issues antenna centering and hi measurement phase center movement base station fixed d coordinates initialization satellite geometry elevation angles random short term systematic errors radial nature validation production horizontal datums projections vertical considerations ellipsoidal heights msl elevations geoidal undulations planning preparation an survey systems history what is the acsm components advantages measurements validations height undulation crown registry geographic branch issue revision date iso crgb procedures manual v ja wcbm doc page i do figure typical setup stations appendix documents b references c recommended information sources...