10/30/20151 determining rangeland suitability for cattle grazing based on distance-to-water,...
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DDetermining rangeland suitability etermining rangeland suitability for cattle grazing based on for cattle grazing based on
ddistance-to-water, terrain, and istance-to-water, terrain, and soilssoils
MGIS Capstone Project - Peer Review
July 8, 2008
Dennis Oberlie, Wyoming Game & Fish Dept.
Academic Advisor: Joseph A. Bishop, Ph.D.,
Penn State University, Department of Geography
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GoalGoal
Develop a user-friendly GIS model using ESRI software to determine rangeland grazing suitability for cattle
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Presentation OutlinePresentation Outline
Where?Who?Why?What?How?
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ExampleHow to ImproveObjectivesIssuesProceduresFuture ApplicationsQuestions
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–Wyoming– Bureau of Land
Management (BLM)
– Lander Field Office
WhereWhere
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WhoWho
Bureau of LandManagement
(BLM)
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– Grazing major use of public rangelands– Determine lands available for grazing– Determine appropriate numbers of
livestock– Manage for uniform grazing to prevent
land degradation
WhyWhy
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Factors used to determine grazing suitability
Terrain and slope
Distance-to-Water
WhatWhat
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WhatWhat
Terrain
– 0 to 10% Slope Suitable– 30% Slope 50% Suitable– Over 60% Slope Unsuitable
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Distance-to-Water
0 – 1 mile 100% use
1 - 2 miles 50% use
Over 2 miles No use
WhatWhat
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HowHow
Two Current Methodologies
1. Holechek (1988, 1998)– developed during the “infancy” of GIS – 4 reduction categories– determine percent reduction of area
available for grazing– most existing determinations use this
method
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HowHow
2. Guenther et al. (2000)– Uses GIS (IDRISI software from Clark
Labs)– 5 suitability categories– determine % of area suitable for
grazing (Inverse of Holechek)
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Sweetwater Canyon Example
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How to Improve Current MethodsHow to Improve Current Methods
Develop systematic computer-based methodology
Create a barrier-to-movement layer
Consider vegetation capability of soils
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Barrier-to-MovementBarrier-to-Movement Use slope > 60% to create
barrier layer Calculate shortest distance
to water around barrier
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SoilsSoils
Suitable for vegetation Rock outcrops
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Project GoalProject Goal
Develop a user-friendly GIS model using ESRI software to determine rangeland grazing suitability in the Lander Field Office of the Bureau of Land Management
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Project ObjectivesProject Objectives
Develop a GIS Grazing Suitability Model using ESRI Tools to create an automatic process with minimal user inputs
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Project ObjectivesProject Objectives
Develop a GIS Grazing Suitability Model using ESRI Tools to create automatic process with minimal user inputs
Compare GIS based analysis with existing (paper map) calculations and to verify modifications with local rangeland experts
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Project ObjectivesProject Objectives
Develop a GIS Grazing Suitability Model using ESRI Tools to create automatic process with minimal user inputs
Compare GIS based analysis with existing (paper map) calculations to verify modifications with local rangeland experts
Develop summary to explain methodology and data
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Data Availability IssuesData Availability Issues
Water sources layer– Seasonal water sources–Man-made sources not consistently mapped
Fences– Incomplete and out-of-date
Soil mapping– Detail of mapping units
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ProceduresProcedures
Clip all layers to Pasture Bdry
Elevation
Rivers
Pond/Lakes
WaterWells
Soils
Calculate Slope
Classify by Slope
Create SlopeBarrier Layer
Merge Water
SourcesUpdateWater
Sources
Classify by Distance-To-
WaterAround Barrier
Layer
Classify by soil suitability
Sum Slope and D-T-W Classification for
Total Suitability
Union Suitable Soils with Total
Suitability
CalculateAcres and
% Suitable
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ScheduleSchedule
July 08
Aug Sep Oct Nov Dec Jan09
Feb Mar Apr May
Finish ClassFinish Class
Develop Model & UpdateDevelop Model & Update
Present to WySRMPresent to WySRM
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Future ApplicationsFuture Applications
Use model for a Decision Support System– New water sources– Additional fencing–Monitoring plans
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Future ApplicationsFuture Applications
Use model for a Decision Support System– New water sources– Additional fencing–Monitoring plans
Other factors to include in model– Vegetation– Conflicting land uses
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ThanksThanks
Wyoming Game and Fish DepartmentStaff of the Bureau of Land Management
- Lander Field OfficeJoe BishopDoug MillerBeth KingAnd most importantly–My Wife
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How to test the model
• Validate the success and utility of this project
Your Questions/Input
Contact Dennis Oberlie : [email protected]