How Did Metro Boston Grow? 2000-2010
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Transcript of How Did Metro Boston Grow? 2000-2010
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How Did Metro Boston Grow?2000-2010
11.521 – Spatial Database Management and Advanced GISFinal Presentation
Group Members: Amy Jacobi, Eric Schultheis, Nse Umoh, Rob Goodspeed, Samira Thomas
Prof. Joseph Ferreira
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Presentation Outline
• Project Goals• Process• Methodology• Results• Conclusions
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PROJECT GOALS
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Project Goals
• Evaluate growth patterns in the metro-Boston between 2000 and 2010.
• Compare observed growth in the last decade with the MetroFuture scenarios: Let It Be and Winds of Change.
• Understand the effect of observed growth on greenhouse gas emissions by private vehicles.
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PROCESS
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Process Map
Land Use Polygons
(1999 & 2005)
Census Block Populations
‘Non-Residential’ Block Finder
Allocation ModelAllocation to 250m Grid
MetroFuture Scenarios (TAZs)
Results
Allocation to TAZ
Allocation to Residential Areas
Allocation to Sensible GeographiesInput Data Evaluating
Growth in metro-BostonAllocation to 25m
Grid
Geop
roce
ssin
g
VMT(205m Grid)
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METHODOLOGY
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Conflicting Topographies: An Example Area
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Conflicting Topographies
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Conflicting Topographies
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The Grid(s)
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Resolving Conflicts with the Grid (25m)
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Allocation to Residential Areas
• Identify residential and institutional land uses.• Identify blocks that do not intersect residential land use
areas.• Land use allocation
– Sliver Finder• Integrate Census Blocks (2000, 2010) and residential land uses• Calculate areas, perimeter, and area/perimeter ratio• Eliminate features with areas less than 400 sqm and area/perimeter
ratio less than 1
– Population/housing unit allocation model (Access)• Paloc= P * (A + L) / 2• A = land use area % of total area of Block, L = land use area %
of residential area in Block
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Model to Identify Block that do not Intersect with Residential Areas
Model to Allocate to Residential Areas
ArcGIS Models: Allocating to Residential Areas
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Allocation to Residential Areas
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• Merge allocated residential areas with ‘missed’ blocks forming an allocated areas polygon file.
• Calculate the number of 25m grid centroids that fall in each allocated areas polygon.
• Identify allocated areas polygons with no 25m grid centroids.
• Convert the allocated areas polygons to 25m grid celss.• Aggregate allocated 25m grid cells to 250m grid cells
(add in population missed by 25m grid method).• Aggregate allocated 25m grid cells to TAZs (add in
population missed by 25m grid method).
Allocation to Sensible Geographies
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ArcGIS Models: Allocating to Sensible Geographies
Model to Merge Habitable Area and Populated Blocks with no Residential Area.
Model to Allocate to 25m Grid and then Aggregate to 250m Grid (due to resolution of 25m grid, metro-Boston area must be divided into 32
slivers and model run for each sliver )
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Allocation to Sensible Geographies
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Comparing 11.521 & MassGIS Allocations
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RESULTS
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CONCLUSIONS