South Pender Sch F - Steep Slope Hazards Map - OCP Bylaw No. 107

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SOUTH    PENDER    ISLAND
     SOUTH PENDER ISLAND
OFFICIAL COMMUNITY PLAN
Bylaw No. 107
 Schedule F
Steep Slope Hazard
 South Pender Island
Local Trust Committee
Schedule F
Scale  1 : 10,000
02505007501,000125
Meters
Supportng   Da t a  and  Li mi   taaons ? ? 
 
 
This  South  Pender  Island  Steep  Slopes  Hazard  Map  has  been  created  using  a  slope  gradient  generated  from  a  digital  elevaton  mo del  ?
(DEM). A DEM is a digital representaton  of   gr ound  sur face  topogr aphy ,  or   topogr aphi c  rel ief , bui lt  us i ng  remo t e  sens i ng  tec h?niques and 
aerial  photography.  There  are  a  number  of  limitatons   i n  uul izing  aer i al  phot ogr aphs   to  dev el op  Di g it al   El evavon Mode  l s   (DEM) ,     whi ? ??ch 
should be noted when considering the spatal  res ol uuon  of  the  map ped  haz ard  areas .   The  qual i ty  of  the  DEM  may    var y  accor di ng?? to many 
conditons :  ter rai n  roughnes s,  samp l ing  dens i ty,  gr i d  res ol uuon  ( or  pi x el   si ze) ,   interpol alon al gori t hm,   v  ervc al  r esol uso?????n  and  terrain 
analysis algorithm. The quality of the air photos and the scale used may have a?ec t ed  the  DE M    res ol uuon,   as  t??he air photos may not have 
captured all topographic elements, such as ravines, localized blu?s,  or   sma l l scal e  feat ur es .  The  ?South Pender DEM was derived from the 
air photos ?own   at   a  scal e  of   1: 16, 000,  wi  th  0. 5  m    ver rcal   accur acy  on  open  ground  s urf ace??s and 30 cm horizontal resoluton.  For   thos e  ?
areas  with  extensive  forest  canopy,  the  elevaton  accur acy  coul d  var y  by   as   mu c h  as   hal f  of   the  tree  hei ght .  In  addi ion,   ??classi?ed  St eep  ?
Slopes Hazard areas smaller than 36 square metres have been ?lter ed  out   of   thi s  ma p,  the  res ol uu??on of these areas having been deemed 
insigni?cant   to  the  pot ennal  geol ogi cal   haz ard.   ?? 
 
The  ratonal e  and  suppor t  for   the  cl as si ?cacon of   S teep  Sl opes   Haza r d  desi gnagons i s   contai ned i n  the  rec ommend a eons   of   a?? ???  report 
prepared  for  the  Islands  Trust  by  Shane  Moore,  P.  Geo.,  C.  N.  Ryzuk  and  Associates.  Copies  of  the  report  (C.N.  Ryzuk  and  Associates, 
Geological Hazard Mapping Project, North Pender Island, December 2009) can be obtained by contactng  the  o? ces  of  t he  I s lands   Trus t. ??? 
Moderate Hazard (22.5 - 45 degrees)
High Hazard ( > 45 degrees)

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