gps gis gis in campbell river gps: global positioning system originally designed for use by the...

GPSGPSGISGISGIS in Campbell GIS in Campbell RiverRiver

GPSGPSGISGISGIS in Campbell GIS in Campbell RiverRiver

GPSGPSGISGISGIS in Campbell GIS in Campbell RiverRiver

GPSGPSGISGISGIS in Campbell GIS in Campbell RiverRiver

GPS: Global Positioning GPS: Global Positioning SystemSystem

Originally designed for use by the militaryIt is a satellite-based, radio navigation system

giving accuracies of around 25 meters, anywhere on earth

How receivers use satellitesHow receivers use satellitesReceivers are able to determine the distance to a

satelliteNeed 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 GPSErrors inherent to GPSPositional error is due to:

– the individual GPS pseudorange – dilution of precision effect of the satellite geometry

Errors in GPS:

Pseudorange

Differencing to correct for pseudorangeDifferencing to correct for pseudorange

Errors in GPS: Dilution of precisionErrors in GPS: Dilution of precisionDue to the position of the satellites

Good geometry Bad geometry

GPSGPSGISGISGIS in Campbell GIS in Campbell RiverRiver

GPSGPSGISGISGIS in Campbell GIS in Campbell RiverRiver

GIS: Geographic Information GIS: Geographic Information SystemSystem

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 captureData captureData available in digital form, in a form the

computer can recognizeIf 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 methodologyData collection methodologySHIM: 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 DataIntegration of DataVarious programs to integrate the dataProcess of adding layersAbility to link to databases

Integration of Data Integration of Data Final Product Final Product

GPSGPSGISGISGIS in Campbell GIS in Campbell RiverRiver

GPSGPSGISGISGIS in Campbell GIS in Campbell RiverRiver

GIS in Campbell RiverGIS in Campbell River

Streams with SHIM Data in the Campbell

River Area and on Quadra Island

GIS in Campbell RiverGIS 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