Data Set Description:
Manholes are access points to underground pipes and wires in the City's infrastructure network. They occur along mandated minimum spans of underground infrastructure. Hammon Jensen Wallen captured manhole locations from the Digital Orthophoto and included these lines in their AutoCAD deliverables along with street centerlines, SPOT elevations, contours, etc. Also, OPW engineers captured manhole locations with identification numbers in their AutoCAD "sewer sheets."
Non-standard Attributes in table:
- Elevation = Elevation of the manhole in feet. (The field currently contains no data.)
- Fix = The Manhole identification number.
Data Source History:
Kyle Draganov of Earthwise Consulting combined and corrected the City of Oakland, OPW AutoCAD drawings into a single sheet and extracted the manholes for the whole city from these sheets using Arc/Info's shapearc & append utilities. Then the single layer was corrected to coordinates set by CH2M Hill. The result was an Arc/Info coverage of manholes.
Kyle Draganov, Earthwise consulting, corrected the layer to Digital Ortho accuracy from 306 AutoCad layers after appending them into 1 ArcInfo coverage. Kyle had two coverages of manholes, one with accurate attributes and the other with accurate geometry. Using the nearest neighbor link, Kyle conflated the attributes to the geometry of choice in ArcInfo.
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