Benefits of Presenting Statistical Information in a Geospatial Context Presented by: Matt Wootton...
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Transcript of Benefits of Presenting Statistical Information in a Geospatial Context Presented by: Matt Wootton...
Benefits of PresentingStatistical Information in a
Geospatial Context
Presented by: Matt WoottonMinistry of Agriculture and Forestry
New Zealand
Conference on Climate Change, Development and Official StatisticsSeoul, Republic of Korea,
11-12 December 2008
How
Why
What
WhoWhen
Where
•Geographic Information System(GIS) usage at the Ministry of Agriculture and Forestry(MAF)
• Building Spatial Data
• Sector-specific statistics used at MAF
• Sample Spatial Analysis
Presentation OverviewPresentation Overview
•Structure
•GIS Responsibilities at MAF
•GIS Focal Points at MAF
GIS @ MAFGIS @ MAF
Spatial DataSpatial Data
•Does breakdown of land match scale of statistics?
Data Building – Issues and OpportunitiesData Building – Issues and Opportunities
Soil TypezKe 20 HazTo 25 HazKw 55 Ha
•Do tabular attributes link to spatial layer’s attributes?
•Existing spatial layer that properly represents your data? (i.e. matching log export statistics to a specific port or region)
•Add attributes to data from spatial data based on location?
Example 1a: Using agricultural statistics to calculate stock unit density...
StatisticsStatistics
5.0 Stock Units per Ha
Farm Area in Ha Stock Units
A 200 1,000
B 400 1,000
C 400 3,000
1,000 5,0001,000 5,000
55 1,000 5,0001,000 5,000
Example 1b: Using agricultural statistics in a GIS to calculate stock unit density…
Statistics in a GISStatistics in a GIS
7.1 Stock Units per Ha
7.17.1 700 5,000700 5,000
Basic Point Data – what you can do withBasic Point Data – what you can do witha set of numbersa set of numbers
Weather Data
•Widely used
•Well funded and valued
•Generally understood
Basic Point Data – how Basic Point Data – how far can you take it?far can you take it?
•Location of the weather stations
•Apply a colour scheme
•Interpolate results/create surface
Soil Moisture Deficit/Drought in New ZealandSoil Moisture Deficit/Drought in New Zealand
Points to consider…
Data IssuesData Issues
•Time Series Data - backwards compatibility
•Continuous/Discrete Data - when to use which type?
•Metadata
Sector Based Statistics Sector Based Statistics in New Zealandin New Zealand
Agriculture Production Survey/CensusAgriculture Production Survey/Census
•Includes Agriculture and Forestry sectors
•Government funded product
•Data collection
•Levels of Geography
•Data Suppression
http://www.stats.govt.nz/datasets/primary-production/agriculture-production.htm
National Exotic Forest DescriptionNational Exotic Forest Description
•What is it?
•Data Collection
•Highly valued
•Usage
•Government funded product
Sample Analysis:Sample Analysis:Land Use ChangeLand Use Change
•Land Resource Inventory
•Agribase
•Land Cover Database 2
•Excluded lands–Department of Conservation–Forested lands (2 types)
Statistics/Data used in sample analysisStatistics/Data used in sample analysis
Land Resource Inventory…•Three main data themes
–vegetation –land use capability–Soil (permeability shown)
Data used in sample analysis –Data used in sample analysis – Land Resource Inventory Land Resource Inventory
LUC classes 1 to 5
-flat to gradually sloping land
-highly productive soil
(orange areas)
Agribase…•Commercial product
•Contains contact info, farm type, stock numbers, farm composition
Statistics used in sample analysis –Statistics used in sample analysis – Agribase Agribase
Farm types not suitable for
expansion were excluded.
(fish farms, vineyards, zoos)
(purple areas)
Data used in sample analysis –Data used in sample analysis – Land Cover Database 2 Land Cover Database 2
Land Cover Database 2•Classifications based on 2001-2003 Landsat 7
•National coverage
•Highly used/valued data layer in NZ
Ensure all suitable lands included -all low and high production grasslandswere added (yellow areas)
Data used in sample analysis –Data used in sample analysis – Screening Layers Screening Layers
•Department of Conservation
•Indigenous Forest
•Exotic Forest
DoC, indigenous and exoticforest lands were eliminatedfrom selection (green areas)
Native forest - off limits to development
Refuges, stewardships, covenants, parks
Predominantly Radiata Pine for harvest
Data used in sample analysis –Data used in sample analysis – Processing Processing
•Isolate suitable parcels
•Intersect suitable lands with land parcels
•Randomly select parcels throughout NZ untilthreshold value is reached
•Remove land parcels currently in the expanding land use type
Economic Drivers
Environmental Considerations
Social Factors
Farming Operation GrowthFarming Operation Growthfor a Given Scenariofor a Given Scenario
Statistics within a GIS adds value
Data linkages, visual clarity
Provides versatility
SummarySummary
Thank you