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Deer Map Data harvested from social media: Flickr, Youtube. G. Kent Webb San Jose State Information Systems Deer Management Research Using the Internet : Analysis of Deer-Vehicle Collisions and a Survey of Current Deer Management Issues.

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Deer Map

Data harvested from social media:

Flickr, Youtube

G. Kent Webb

San Jose State

Information Systems

Deer Management Research

Using the Internet: Analysis of Deer-Vehicle Collisions

and a Survey of Current Deer Management Issues

Early warning predictor of EHD outbreak

Source: Googe Trends, searches on

“deer dying”

deer location and density is aggregated often at the county level

Yearly Deer Traffic Deaths, at least: 1.5 million. 2011 Reported Hunt: 6.44 million

The Data Analysis Problem: Deer-Vehicle Collisions Depend on the Conditions at Specific Locations

Deer density data is often aggregated at county or regional level


Schwabe et al (2002) find

Positive correlation at p < .01 with

number of collisions and

number of bucks, but

Negative correlation at p < .01 with

number of collisions and

number of does

(more does, fewer collisions)

Deer Location and Density is Aggregated,Often at the County Level

Mr. T, Victim of Hit and

Run, 2010. Back in the

Rut, 2012


Predict High-Risk Deer-Collision Freeway Segments by Using Google Maps to See Where These Deer May Have Access to the FreewayKolowksi and Nielson (2008)examined the similarity between bobcat habitat and road habitat to create a technique for mapping wild-life vehicle collision risk. The authors conclude: “Unlike other modeling techniques used to identify risk of road mortality, our method requires little field data collection and relies on readily available digital spatial data.”


Freeway Risk and CollisionsOverlay Risk Map and Data From California Roadkill Observation SystemU.C. Davis Web Site Allowing Users to Post Observations of Wildlife CollisionsBlue Balloons Mark Collisions

h1 deer collisions per mile of freeway are higher in the high risk segments
H1: Deer collisions per mile of freeway are higher in the high risk segments

Webb, G.K. "Predicting Risk of Deer-Vehicle Collisions Using a Social

Media-Based Geographic Information System"

(2012) Issues in Information Systems Volume 13, Issue 2. pp. 170-181

analyze specific road conditions using google maps
Analyze Specific Road Conditions UsingGoogle Maps

High risk segment

of I-280

Deer habitat on

both sides of freeway.

Blue balloons




analyze using street view
Analyze Using Street View

- Deer spotted in nearby open space

- No collisions were reported along

this high risk segment of I-280

- Little vegetation to block vision or

attract deer

analyze using street view1
Analyze Using Street View

High collision segment on U.S.1

Thick vegetation growing along the road

Few deer sighted in the area

Verified with physical inspection of the area


Combined Data


Bay Area Deer Map

- Analyze Bias and Information

- Independent Data, Many Sources

  • Google Maps:
  • Lots of Information
  • Difficult Analytical Platform
  • - Experimental: Fusion Tables
Internet Project, Decision Support Site, Environmental Scanning, Knowledge Warehouse, Model Development

58,911 Unique Visitors in 2012


Deer disease a major concern October 27, 2012 Michigan, Royal Oak Daily Tribune...  epizootic hemorrhagic disease (EHD) ... “There’s a lot we don’t know about how weather affects the disease. Last year’s mild winter and dry weather this year have affected the abundance of the little insects that transmit the disease... If you believe in global warming, we may see more cases in the future ..."  DNR wildlife veterinarian Dan O’Brien

  • South Dakota Reduces Tags during 2012
  • Season Because of EHD
  • Other States May Reduce Tags This Year
  • An important issue for a long-term
  • deer model

2012 Searches on EHD

July 2012

Oct 2012

chronic wasting disease cwd mad cow for deer prions
Chronic Wasting Disease (CWD)(Mad Cow for Deer – Prions)
  • States with First Case of CWD
  • Discovered in 2012
  • Pennsylvania, Deer Farm – Some deer
  • escaped, but eventually found and killed
  • Iowa, Deer Farm (10,000 farms in U.S.)
  • Texas, Low deer density area along the
  • border with New Mexico near other cases
  • Wisconsin Legislative Audit Bureau
  • determines culling deer in CWD areas
  • is not effective. Not density – Ecosphere, 2013
  • Deer culls continue to be the main treatment response
  • in other states.

January, 2013

Some recent articles report development of tests for CWD, low accuracy, but do not require killing deer


 A conservation model crafted specifically for Texas November 14, 2012 Austin American-Statesman

The state has provided super strong private landowner protections for management and access, and it's invented the concepts of modern deer management to control herd numbers [balanced sex and age], enhanced habitat manipulation, supplemental feeding and management of buck harvests to improve the genetic makeup of a population.  Those concepts remain somewhat controversial ...“We’re not discounting the North American Model,” says Macy Ledbetter, a private consulting biologist who helped write the document. “It was a wonderful document when it was produced in the late 1800s...

California deer harvest is

51 percent two point


Washington: 24 percent

Nevada: 30 percent

California Buck to doe

ratio reported in 15 to

100 range

Little public support for

trophy hunting


Review of Wisconsin Deer Program- Led by Texas Deer Biologist, Dr. James Kroll, so concern about imposing the Texas model – didn’t happen Recommendations - criticized inaccurate deer population models - called for more passive approach to CWD, the approach of killing deer has failed - called for more public input in making decisions (Wisconsin routinely issues press releases for public meetings, not found in California – Nevada hunters calling for more transparency)

Governor's office takes on direct role in hunt management October 12, 2012

South Dakota,

Wildlife management is at issue, specifically regarding mountain lions, elk,

deer and antelope...  an outside consultant will be contracted ... to review

and advise the state Wildlife Division ... wildlife belong to the people in South Dakota


Nevada – Deer Wars... “We’re overharvesting,” insists Scott Raine, the wildlife commission’s former chairman ... Raine insists the modeling used to estimate Nevada’s mule deer population is based on false assumptions or conjecture and that the numbers are far lower than cited.  “They’re just wild guesses,” [Nevada Model on the internet]Hunters, wildlife officials lock horns over whether Nevada mule deer are over-harvestedOctober 27, 2012 RGJ.comNevada Hunter: “There are no deer! ... I have lived in Nevada since 1953 and hunted deer since 1962 ...Someone in NDOW needs to start telling the truth about the deer herds in our state...Nevada's deer herds misrepresented November 13, 2012 Elko Daily Free Press, Gene Perry

Studies Reported to Press during 2012 in States with Declining Deer Populations: Only Oregon Related to Deer Hunt Management

81 pound coyote or wolf hybrid shot in Missouri in November, previous record is 74 pounds

Coyotes, may need to kill 70 percent. * Stewart: No impact of predator control. 2011


Overlay of Estimates for 1962 and 2012

Bottom Graph from California Department of Fish and Wildlife Web Site

Too Many



California Reported Deer Kill

1910 into 1990s

Almost to Where Hunting Was Suspended in the Past

Debate on Historic Reporting Variation – Hunter Efficiency Has Improved

Tags Issued is a Variable We Can Control





Similar Pattern of Harvest Data on The Utah Division of Wildlife Website

But Without the Qualifications Seen on The California Site

A Deer Relocation By Helicopter Currently Underway in Utah





Search Volume on “Deer”

Darker, More Volume

Wildlife in the U.S. and

Deer in California are Falling

Out of the Public’s Interest

- Public Outreach, a Current

Theme in Wildlife Management

Search Volume on “Wildlife”, 2004 to 2012