34944E3BF675F2CDE050CD9B2144225DEnglishDepartment of Lands, Planning and EnvironmentSurveyor General -(08) 8995 5360robert.sarib@nt.gov.au2017-02-10AS/NZS ISO 19115 Geographic Information - Metadata, ANZLIC Metadata Profile1.0 Northern Territory Geodetic Survey System - Survey Control The dataset contains an extract of survey control information derived from the Survey Marks Data Base, the current repository for the Northern Territory Geodetic Survey System (NTGESS), created and maintained by the custodian, Survey Services, Land Information Division. The primary function of NTGESS is to maintain the official record of horizontal and vertical survey control data, and as such this extract includes positional, height and other information such as locality sketches. The data is freely available and accessible to all interested parties.English-26-101291382016-06-06datasetnot knownThe survey mark information included in the dataset is used in the realisation of a Geospatial Reference System (GRS), providing a sound geodetic framework for spatial data users in the Northern Territory. The custodian is currently involved with a national datum modernisation program, during which the completeness, maintenance any relevancy of discrete records within the NTGESS will be assessed. The accuracy of the qualitative survey information is unable to be qualified or estimated.0not knownThe dependability of relationships within the dataset are maintained and highly correlated.0not knownThe 'Status' of a survey mark provides an indicative confidence estimate of the HORIZONTAL positional uncertainty, where: - Adopted - The coordinates of the mark have been adjusted as part of a larger network adjustment (+/-30mm horizontal positional uncertainty) - Approved - the coordinates for the mark have been submitted to, and validated by the custodian (+/- 30mm horizontal survey uncertainty) - Lodged - the mark has been physically placed in the ground, established via cadastral survey and in most cases shown on a cadastral plan with the bearing and distance connection to cadastre reported (+/- 20m positional uncertainty) - Proposed - a unique identifier has been allocated and coordinates are approximate/digitized only (+/- 100m positional uncertainty) - Disturbed - the mark has been reported as physically disturbed, verified by cadastral connection or comparison of coordinates - Gone - the mark has been reported as "gone" All benchmarks assume the status of "Lodged" only, as the quoted coordinate is approximate only, having been digitised from a legacy BM index map.0not knownSurvey mark attribute information is updated by the Custodian as and when required. Private Surveyors support the ongoing maintenance of records within NTGESS, through lodgement of an NTGESS spreadsheet detailing metadata for each survey mark established or visited. These spreadsheets are verified and then imported directly into the NTGESS / Survey Marks Database (SMDB), updating each record accordingly. The accuracy of the qualitative survey information is unable to be qualified.0The survey control information has been collated from various sources in order to realise a geodetic framework for the Northern Territory, underpinning all other spatial data: - The custodian has primarily been involved with the physical installation, coordination, mathematical adjustment, maintenance and reporting of the survey mark and associated information; - Private contractors/Surveyors have jointly taken responsibility for the physical installation, coordination and maintenance of survey marks and associated information. The coordinates provided for a survey control mark may be the result of a rigorous Least Squares Adjustment, with some level of confidence associated with the results. Other coordinates which have not been 'processed' in this way may be scaled or approximate, or derived from GNSS survey methods such as Real-Time-Kinematic . The 'status' of a survey mark indicates the certainty of the stated coordinate (see 'positional accuracy').