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DNR historical lake survey","url":"https://apps.dnr.wi.gov/doclink/lakes_maps/2638700a.pdf","surveyDate":"1968-05","notice":"Twelve directly traced historical source paths at 5 to 35 ft, May 1968, rendered as seventeen water-only contour parts after modern water and island clipping. Other contours remain undigitized; printed label gaps preserved. Maximum independent historical placement mismatch about 35 m. Big Trade Lake only; Little Trade Lake is excluded. The isolated 39 ft sounding is not represented as a contour. Digitized contour geometry, not individual soundings or current measured depths. Not for navigation.","reuse":"Factual depth geometry redrawn with source attribution; not an agency license or CC0 claim","reuseBasis":{"assessment":"Factual-data derivative interpretation, not an explicit agency license or CC0 claim","factsGuidance":"https://www.copyright.gov/comp3/chap300/ch300-copyrightable-authorship.pdf","mapAuthorshipGuidance":"https://www.copyright.gov/comp3/chap900/ch900-visual-art.pdf","sourceUsePolicy":"https://dnr.wisconsin.gov/legal/acceptableuse","sourceNotice":"A Public Document - Please Identify the Source when using it.","graphicRepublished":false,"limitations":"Source website terms remain relevant; reassess for commercial sale or image republication."}},"reuseBasis":{"assessment":"Factual-data derivative interpretation, not an explicit agency license or CC0 claim","factsGuidance":"https://www.copyright.gov/comp3/chap300/ch300-copyrightable-authorship.pdf","mapAuthorshipGuidance":"https://www.copyright.gov/comp3/chap900/ch900-visual-art.pdf","sourceUsePolicy":"https://dnr.wisconsin.gov/legal/acceptableuse","sourceNotice":"A Public Document - Please Identify the Source when using it.","graphicRepublished":false,"limitations":"Source website terms remain relevant; reassess for commercial sale or image republication."},"partialCoverage":true}