GPS GIS GIS in Campbell River

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

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)

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

Errors inherent to GPS Positional error is due to: – the individual GPS pseudorange – dilution of precision effect of the satellite geometry

Errors in GPS: Pseudorange

Differencing to correct for pseudorange

Errors in GPS: Dilution of precision Due to the position of the satellites Good geometryBad geometry

GPS GIS GIS in Campbell River

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)

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

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

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

Integration of Data Final Product

GPS GIS GIS in Campbell River

GIS in Campbell River Streams with SHIM Data in the Campbell River Area and on Quadra Island

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