GPS GIS GIS in Campbell River

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GPSGISGIS in Campbell River
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GPSGISGIS in Campbell River
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GPS Global Positioning System

• Originally designed for use by the military
• It is a satellite-based, radio navigation system
  giving accuracies of around 25 meters, anywhere
  on earth

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How receivers use satellites

• Receivers are able to determine the distance to a
  satellite
• Need at minimum of four satellites to determine
  your location in 3D (there are four unknows
  latitude longitude, height and receiver clock
  error)

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Two satellites and you know the distance to each
one Three satellites with three known
distances
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Errors inherent to GPS

• Positional error is due to
• the individual GPS pseudorange
• dilution of precision effect of the satellite
  geometry

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Errors in GPS Pseudorange
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Differencing to correct for pseudorange
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Errors in GPS Dilution of precision

• Due to the position of the satellites

Good geometry Bad geometry
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GPSGISGIS in Campbell River
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GIS Geographic Information System

• GIS is a computer system capable of assembling,
  storing, manipulating, and displaying
  geographically referenced information
• Relate information from different sources as long
  as the location of variables are known (aerial
  photographs with water sampling information)

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Data capture

• Data available in digital form, in a form the
  computer can recognize
• If the data to be used are not already in digital
  form, various techniques can capture the
  information. Maps can be digitized, or
  hand-traced with at computer mouse, to collect
  the coordinates of features. Electronic scanning
  devices will also convert map lines and points to
  digits
• Data can be collected with a GPS unit

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Data collection methodology

• SHIM Sensitive Habitat Inventory and Mapping
• Collects the centerline of the stream (points or
  dynamic line) while locating habitat features and
  features affecting fish distribution and stream
  health
• Examples of features
• Bridges, Culverts, Bank Erosion, Storm Drain
• Enhancement Sites, Spawning Habitat, Wetlands

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Integration of Data

• Various programs to integrate the data
• Process of adding layers
• Ability to link to databases

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Integration of Data Final Product
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GPSGISGIS in Campbell River
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GIS in Campbell River
Streams with SHIM Data in the Campbell River Area
and on Quadra Island
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GIS in Campbell River

• Obtain GIS layers
• Review the SHIM data and conduct Quality
  Assurance Quality Control
• Production of the Community Watershed Atlas and
  to get data included into the Sensitive Habitat
  Atlas