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Dennis Jongsomjit

on 20 August 2013

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Transcript of GIS

What is GIS?
Spatial Analysis
The Digital Age
Temperature, for example:
Building Blocks
GIS at
Point Blue
Example 1
Example 2
Geographic Information System
and understand

to reveal relationships, patterns,
and trends
An early example
GIS can now store countless numbers of records.
to GIS is its ability to relate records to real locations (and time)
You also have the ability to map and query records across different sources
Goes from numbers in a table...
To a format that conveys the same
information in a more meaningful way.
Where are the hottest locations in CA?
Are the foothills hotter than the valley floor?

What is the average
in Sonoma County?
We can add a county GIS layer, then...
Real Objects are represented by:
Rasters (or grid)


Vectors (points, lines, polygons)
And these can be
visualized and queried
in seconds
Grid cells of data
related to a location
Using ecological principles to gain understanding across spatial scales
Make recommendations and guide conservation efforts
What factors are affecting shorebird
abundance in the Sacramento Valley?
scale factors such as vegetation at the survey point.
scale factors such as flooded
habitat within 10 km of the survey point.
Central Valley managed wetlands
Overlay onto habitat types...
What habitat surrounds
each wetland unit?
GIS creates the buffer then queries the layers of interest.
Proportion flooding 10km
Where are the hottest locations in CA?
Are the foothills generally hotter than the valley floor?

What is the proportion of flooded habitat within 10km?
Again, Ecological principles
The species niche concept
Environmental conditions
which allow a species to
survive and reproduce
If we can characterize a
species niche then we can
correlate those using GIS and a model
Species locations
Extract values of important
Climate, vegetation, etc
Wiens J A et al. PNAS 2009
Brown Creeper modeled suitability
Where might communities change
the most across the
What areas
should we
target for
Project this to

climate GIS rasters
Model then project onto current climate rasters
Model relationships
The distribution model chain process
Outside the box:
What are some ways STRAW can use GIS?
GIS was used to create and select plot locations
The spatial analysis chain process
What habitat surrounds
each wetland unit?
Allows us to create geographic knowledge by
measuring the earth
organizing this data,
and analyzing and modeling various
processes and their relationships.
Apply this knowledge to the way
we design, plan, and change our world. - ESRI
What is GIS?
What is GIS?
Full transcript