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GIS 2, Final Project: Creating a Dasymetric Map for Two Counties in Minnesota . By: Hamidreza Zoraghein Melissa Cushing Caitlin Lee Fall 2013. General Outline. Study area Delineating residential areas Rural residential areas Urban residential areas - PowerPoint PPT Presentation
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GIS 2, Final Project:
Creating a Dasymetric Map for Two Counties in
Minnesota By:
Hamidreza ZoragheinMelissa Cushing
Caitlin LeeFall 2013
General Outline
Study area Delineating residential areas
Rural residential areas Urban residential areas
Redistributing population density variation Another approach: Area Modified Weighting Limitations and outlooks
Study Area
Two counties in Minnesota Criteria:
Diversity in population density Having both urban and rural areas
Residential Area
DelineationRural AreaStudy Area Urban Area
Population Density
Redistribution
Another Approach
Limitations & Outlook
Delineating Residential Areas
Residential Area
DelineationRural AreaStudy Area Urban Area
Population Density
Redistribution
Another Approach
Limitations & Outlook
Different approaches for rural and urban areas Rural Areas
NLCD Block boundary density
Urban Areas NLCD
Rural Areas
Residential Area
DelineationRural AreaStudy Area Urban Area
Population Density
Redistribution
Another Approach
Limitations & Outlook
Block Areas
Block Boundari
es
Raster Boundari
es
Polygon to Line
To Raster
Focal Stats.
FocalOutput
RasterCalc.
Rural Mask
RuralLandcove
rNLCD 21,
22First
Refinement
SecondRefineme
nt
Extraction
Shrink Clear Boundary
Dense Cells
Mosaic
Rural Areas
Residential Area
DelineationRural AreaStudy Area Urban Area
Population Density
Redistribution
Another Approach
Limitations & Outlook
Some patterns which don’t pass the threshold (33)
Some patterns which pass the threshold
Pics fro Uhl (2011)
Urban Areas
Residential Area
DelineationRural AreaStudy Area Urban Area
Population Density
Redistribution
Another Approach
Limitations & Outlook
Three different approaches were tested: Extraction of classes 21, 22 Extraction of classes 21, 22, 23 Extraction of classes 21, 22, 23, 24
Further Refinement Applying NHD layers
Urban Areas
Residential Area
DelineationRural AreaStudy Area Urban Area
Population Density
Redistribution
Another Approach
Limitations & Outlook
Urban Landcove
r
Water Areas
To Raster
Extraction
Initial UrbanMask
Rasterized
Water
TimesFinal
UrbanMask
Urban Areas
Residential Area
DelineationRural AreaStudy Area Urban Area
Population Density
Redistribution
Another Approach
Limitations & Outlook
Redistributing Population Density Variation
Residential Area
DelineationRural AreaStudy Area Urban Area
Population Density
Redistribution
Another Approach
Limitations & Outlook
Urban Areas DEM Slope Road Density Distance to Flow Lines Distance to Rivers
Rural Areas DEM Slope Road Density Distance to Flow Lines
Residential Area
DelineationRural AreaStudy Area Urban Area
Population Density
Redistribution
Another Approach
Limitations & Outlook
Creating Random Points
ModifiedPop
DensityCalculation
Attributing Points byMod Pop Density
Extracting Rasters to
Points
Summarizing
by Tracts
CorrelationCoefficientsCalculation
Reclassifying
andMasking
ApplyingThe
Weights
Tool(s): Zonal Statistics as Table
Tool(s): Raster to Polygon,Create Random Points
Tool(s): Spatial Join
Tool(s): Extract Values to Points
Tool(s): Summary Statistics
Tool(s): Excel
Tool(s): Reclassify,Times
Tool(s):Weighted Sum
Residential Area
DelineationRural AreaStudy Area Urban Area
Population Density
Redistribution
Another Approach
Limitations & Outlook
Redistributing Population Density Variation
Residential Area
Elevation Slope Distance to Rivers
Distance to Flows
Road Density
Urban (21, 22, 23)
**-0.2666 -0.0898 *-0.1923 *0.1788 ***0.4469
Urban (21, 22, 23, 24)
-0.12736 -0.1888 ***-0.3712 **0.2953 ***0.4788
Rural 0.01238 -0.2318 - **0.5267 *0.4386
Another Approach
Residential Area
DelineationRural AreaStudy Area Urban Area
Population Density
Redistribution
Another Approach
Limitations & Outlook
Based on: Polygon three class method (Eicher and Brewer 2001) Sampling along with Area refinement on the above (Mennis 2003)
Applied on: Urban part of the study area
Type of the method here: Vector based
Another Approach
Residential Area
DelineationRural AreaStudy Area Urban Area
Population Density
Redistribution
Another Approach
Limitations & Outlook
VectorizingLand Cover
Removing Unlikely Classes
Consolidating
Classes
SamplingPop
Density for Classes
Overlaying Tracts on
Land Cover
Calculating Elements per Tract
Pop Density per Class per
Tract
Tool(s): Extraction
Tool(s): Raster to Polygon
Tool(s): Dissolve
Tool(s): Select by Location
Tool(s): Union
Tool(s): Summary Stats, Join, Calculate Field
Tool(s): Join, Calculate Field
Land Cover Class
Sampled Pop Density
Number of Sampled Tracts
Class Fraction
21 1307.199 19 0.10522 1959.088 60 0.15823 2342.447 43 0.18924 2417.448 15 0.19541 1055.519 14 0.08542 589.123 1 0.04781 775.014 4 0.06290 1138.81 1 0.09295 823.109 1 0.066
Sampling Method: CentroidClass i Fraction=
, ,
Another Approach
Residential Area
DelineationRural AreaStudy Area Urban Area
Population Density
Redistribution
Another Approach
Limitations & Outlook
Limitations and Outlooks
Residential Area
DelineationRural AreaStudy Area Urban Area
Population Density
Redistribution
Another Approach
Limitations & Outlook
Limitations Lack of statistical analysis and validation Not utilizing parcel data Not very good for rural areas
Outlooks Using smaller areas for establishing the correlations (e.g. block groups or blocks) Simulation Create random points based on the area of the tracts Using parcel data Exploring other potential related variables Exploring other sampling strategies and making comparisons
Resources
Eicher, C. L., & Brewer, C. A. (2001). Dasymetric Mapping and Areal Interpolation: Implementation and Evaluation. Cartography and Geographic Information Science, 28(2), 125–138. doi:10.1559/152304001782173727
Mennis, J. (2003). Generating Surface Models of Population Using Dasymetric Mapping∗. The Professional Geographer, 55(1), 31–42.
Uhl, J. H. (2011). Master ’ s Thesis : “ Limiting and Related Variables for Dasymetric Analysis of U . S . Census Demography .” University of Colorado Boulder.
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