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Yellowstone National Park. It’s 5 am, do you know where your grizzly bears are?. Continuous Data from GPS Collars Analyzing time and location. Tyler Coleman & Andrea Amparore (presented by Ann Rodman). The problem with so much data. GPS Collar Data.

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Continuous data from gps collars analyzing time and location

Yellowstone National Park

It’s 5 am, do you know where your grizzly bears are?

Continuous Data from GPS CollarsAnalyzing time and location

Tyler Coleman & Andrea Amparore (presented by Ann Rodman)


The problem with so much data . . .

GPS Collar Data

. . . is how quickly it gets complicated.


The study
The Study

  • 15 Grizzly bears with GPS collars

    • location every 30 min

    • 75,000 locations/season

  • Backpacker groups with GPS units

    • location every 5 min

    • 140 trips/season

    • 76,000 locations/season

  • 74 campsites

    A huge amount of data !



Study location
Study Location

  • Bears: 75

  • Hikers: 2,600

  • Four bear management areas

35 miles


Management questions
Management questions

Humans and grizzly bears in the backcountry

  • How often are the bears and hikers in close proximity?

  • Which areas have a higher likelihood of human/bear interactions



bears Intersection hikers

  • Need the time and date when the tracks cross the intersection point

  • In the 2007 data there are more than 15,000 of these intersection points

10:30:18 6/25/2007

10:16:23 6/25/2007

10:21:28 6/25/2007

10:00:14 6/25/2007

10:19:32 6/25/2007


Linear referencing time bears
Linear Referencing Time - bears

  • Use GPS points to add time to lines

    • Need consecutive numbers

  • Clean up GPS data

  • Convert from date/time to decimal hours

    • start midnight 1/1/07

10:30:18 6/25/2007

4186.50 hrs

10:13:28 6/25/2007

4186.22 hrs

begin

end

begin

10:00:14 6/25/2007

4186.00 hrs


Linear referencing time people
Linear Referencing Time - people

Bear crosses point

Hikers cross point

Time difference

10:13:28 6/25/2007

4186.22 hrs

10:18:48 6/25/2007

4186.31 hrs

5:20

0.09 hrs

10:16:23 6/25/2007

4186.27 hrs

begin

10:18:48 6/25/2007

4186.31 hrs

end

10:21:28 6/25/2007

4186.36 hrs

begin

10:19:32 6/25/2007

4186.33 hrs

end


Bears no intersection hikers
bears No intersection hikers

How often do bear and hiker routes come close to each other without crossing?

3786.16 hrs

3786.22 hrs

3786.21 hrs

3786.28 hrs


Management questions1
Management questions

Campsites: Do bears . . .

  • go into occupied campsites?

  • enter during the day or during the night?


Bears and campsites
Bears and campsites

What is the timing?


Buffered campsite
Buffered campsite

Campsite buffer

500 m (sight)

100 m (noise)

50 m (core area)

10 m (campsite)

Bear route with time


Data clock chart
Data clock chart

Within 500 m

Within 50 m

Tracking Analyst display


Data view
Data view

Bears

Campers


Campsite timelines
Campsite “timelines”

Begin (3/25)

End (11/30)

timeline route for a campsite

2000

8000

6000 hours (250 days)

People in camp (linear event along route)

intersect

Bear in camp (point event)

Bear in occupied camp (point event)


Comparing campsites
Comparing Campsites

Bears early

Bears all season

Bears late

Unpopular with bears and people



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