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Low distortion area

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This dataset defines low distortion areas used in Switzerland's official cadastral survey. Within these zones, coordinates already meet higher geometric accuracy criteria, so surveyors working in the field are not required to perform a local adaptation or provide proof that one is unnecessary. Outside these areas, a local adaptation must be applied or its unnecessity demonstrated. Knowledge of these zone boundaries supports practical fieldwork planning and quality assurance in surveying. The dataset is published by swisstopo (Federal Office of Topography) as part of Switzerland's national cadastral and geospatial infrastructure, covering the whole country and relevant to land administration, boundary definition, and topographic reference work.During fieldwork in the official cadastral survey, a local adaptation must be made or proof must be provided that this is not needed. In low distortion areas, a local adaptation is not necessary, because the geometric accuracy complies with higher quality criteria. In practical applications, knowle…