CONNECTIONTYPE POSTGIS
  CONNECTION "dbname=contours host=localhost user=contour_xxxx password=xxx"
  PROCESSING "CLOSE_CONNECTION=DEFER"
  DATA "wkb_geometry from contours USING UNIQUE ogc_fid USING
contourinterval=40"

select
    "contourelevation",
    encode(ST_AsBinary(ST_Force2D("wkb_geometry"),'NDR'),'hex') as geom,
    "ogc_fid"
from contours
where wkb_geometry &&
ST_GeomFromText('POLYGON((-111.939697265625
33.4213636331582,-111.939697265625 33.4323499612832,-111.9287109375
33.4323499612832,-111.9287109375 33.4213636331582,-111.939697265625
33.4213636331582))',find_srid('','contours','wkb_geometry'))