Data Set Description:
Because the grid systems are referenced by the coordinates of each grid's lower left corner, the change from use of North American Datum 1927 to NAD 1983 made the original sewer grid obsolete. However, the legacy data from the NAD27 period of operations sometimes requires a reference to the original grid which is represented by this layer.
Non-standard Attributes in table:
- GRID_NO: Sewer Grid reference number.
- U_ID: Unique identification number.
Data Source History:
Fuad Sweiss (OPW) delivered the grid coverage to Jonathan Lowe (LKC) as an AutoCAD digital exchange format file. Jonathan isolated the grid lines representing NAD27 sewer tile boundaries from other elements using the Arc/Info command "dxfarc." The resultant coverage was already in the city's standard stateplane projection (Cal, zone III) and the appropriate datum (NAD83) and so was not reprojected. (This may seem confusing--the grids represent the locations of an NAD27 system, but are projected in an NAD83 system.)
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