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DWW.IMPERVIOUS_SURFACE_PLGN forms the base as it contains the most accurate description of surface type; CGDB.BLDG2009_PLGN is the most accurate and complete for buildings; DPR.Landcover_Citywide_2007 is complete in coverage but the least accurate. First step in creating the layer is to start with DWW.IMPERVIOUS_SURFACE_PLGN and delete features from [IMPSURF_FEATYPE_CODE] = "Other" "Miscellaneous" Obscured" and "Unknown". The classifications of Other, Misc., Obscured and Unknown are unclear, not always classifying the same surface type, and can be better classified with the other two layers. Second add building footprints from CGDB.BLDG2009_PLGN on top of DWW.IMPERVIOUS_SURFACE_PLGN. Finally, any locations with missing data are filled in with DPR.Landcover_Citywide_2007.
[Pollut_Type] is the surface type placed into eight classifications : Trees, Pervious Landscape, Buildings, Sidewalks, Streets, Driveways/Parking Lots, Water, Other Impervious. See table below for transferring classifcations from source layers.
[Perv_Imperv] classifys either Impervious or Pervious surface.
[Imp_type_I] is an integer that corresponds to [Pollut_Type].
Perv_Imperv | Pollut_Type | Original Attribute | Source Feature Class | Notes |
Pervious | Trees | Trees | DPR.Landcover_2007 | |
Pervious | Trees | Scrub | DPR.Landcover_2007 | |
Pervious | Pervious Landscape | Formal Planter | DWW.IMPERVIOUS_SURFACE_PLGN | |
Pervious | Pervious Landscape | Pervious Landscape Area | DWW.IMPERVIOUS_SURFACE_PLGN | |
Pervious | Pervious Landscape | Grass | DPR.Landcover_2007 | |
Pervious | Pervious Landscape | Bare_Soil | DPR.Landcover_2007 | |
Impervious | Buildings | Building or Garage | DWW.IMPERVIOUS_SURFACE_PLGN | Add CGDB.BLDG2009_PLGN on top of all features in DWW.IMPERVIOUS_SURFACE_PLGN |
Impervious | Buildings | Building | CGDB.BLDG2009_PLGN | |
Impervious | Buildings | Deck | DWW.IMPERVIOUS_SURFACE_PLGN | |
Impervious | Buildings | Elevated Structure | DWW.IMPERVIOUS_SURFACE_PLGN | |
Impervious | Sidewalks | Sidewalk | DWW.IMPERVIOUS_SURFACE_PLGN | |
Impervious | Sidewalks | Walkway or Patio | DWW.IMPERVIOUS_SURFACE_PLGN | |
Impervious | Streets | Street or Alley | DWW.IMPERVIOUS_SURFACE_PLGN | |
Impervious | Driveways/Parking Lots | Drive Way | DWW.IMPERVIOUS_SURFACE_PLGN | |
Impervious | Driveways/Parking Lots | Parking Lot | DWW.IMPERVIOUS_SURFACE_PLGN | |
Impervious | Driveways/Parking Lots | Storage or Railroad Yard | DWW.IMPERVIOUS_SURFACE_PLGN | |
Impervious | Water | Water | DPR.Landcover_2007 | |
Impervious | Water | Swimming or Manmade Pool | DWW.IMPERVIOUS_SURFACE_PLGN | |
Impervious | Other Impervious | Impervious | DPR.Landcover_2007 | |
Impervious | Other Impervious | T_Imp_Und | DPR.Landcover_2007 | |
n/a | n/a | Other | DWW.IMPERVIOUS_SURFACE_PLGN | Not used, deleted before merging with CGDB.BLDG2009 |
n/a | n/a | Miscellaneous | DWW.IMPERVIOUS_SURFACE_PLGN | Not used, deleted before merging with CGDB.BLDG2009 |
n/a | n/a | Obscured | DWW.IMPERVIOUS_SURFACE_PLGN | Not used, deleted before merging with CGDB.BLDG2009 |
n/a | n/a | Unknown | DWW.IMPERVIOUS_SURFACE_PLGN | Not used, deleted before merging with CGDB.BLDG2009 |
Static data layer, no updates.