Exported Shapefile Data Types

[riggsd]

We currently export our karst features as Shapefile with all String fields, which makes it difficult to filter/sort GIS data on numeric fields, for example. I propose changing datatypes as annotated:

OGRFeature(karst_feature_locations):10
  internal_i (String) = 9173               -> Integer
  locid (String) = 9114                    -> Integer
  survey_id (String) = GBR0310
  name (String) = Cow Pasture Cave
  alternate_ (String) = (null)
  type (String) = Cave
  coord_acqu (String) = (null)
  wgs84_lon (String) = -80.123456789012345 -> Real
  wgs84_lat (String) = 37.123456789012345  -> Real
  nad83_utmz (String) = 17N
  nad83_utme (String) = 512345.4830204895  -> Real
  nad83_utmn (String) = 4123456.6519877245 -> Real
  elevation (String) = 1517                -> Real
  region (String) = Muddy Creek Basin
  county (String) = Greenbrier
  quad (String) = Asbury
  length (String) = 150                    -> Real
  depth (String) = 0                       -> Real
  length_bas (String) = estimate
  significan (String) = False
  access enu (String) = (null)
  access des (String) = (null)
  todo enum (String) = (null)
  todo descr (String) = (null)
  source (String) = (null)
  gislbl_pri (String) = 8                  -> Integer
  POINT (-80.1234567890123 37.1234567890123)