Survey Monuments

Point layer of ground markers for surveying, developed in 1991 and densified ca 1997. Layer shows both benchmarks (known elevation) and triangulation stations (horizontal position markers) and their qualities and coordinates. Most were created via the Tompkins County Geodetic/Photogrammetric Control Survey in 1991 (for NYSEG, City of Ithaca, Town of Ithaca and Cornell University) and through the GIS Monument Densifications in 1997. There are also some local survey markers that were installed at various times historically by the City of Ithaca or other various government entities (City, Town, NYSEG, NYSDOT, Cornell, USGS) including a few traditional USGS benchmarks. The in-ground markers have not been inventoried for some time and some may be lost to construction, erosion and other issues.