Introduction to Spatial Analysis. Spatial Analysis. Session organization. Learning objectives. Module organization. GIS and spatial analysis
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1 Introduction to Spatial Analysis I. Conceptualizing space Session organization Module : Conceptualizing space Module : Spatial analysis of lattice data Module : Spatial analysis of point patterns Module : Spatial analysis of field data Stuart Sweeney Population Science and GIS, UCSB, July Learning objectives CONCEPT MEASURE IMPLEMENTATION INTERPRETATION Assess utility and legitimacy of other work Design and conduct your own analyses Incorporate results into presentations / documents Real-time interactive analysis and interpretation with research group Module organization GIS: Geographic Information System Storage, retrieval, and display of spatiallyreferenced data GIS analysis : buffers, map algebra, layering Spatial Analysis Quantitative analysis of spatial processes Spatial econometrics, statistics, optimization GIS and Spatial Analysis Spatial Analysis (cont.) Traditions: Spatial econometrics: irregular lattice, cross-section Spatial statistics: spatial processes Geostatistics: continuous fields, regular lattice
2 Statistics Measurement scale Information Method Spatial analysis Spatial data type Information Method GAM GLM Continuous [N(*,*) or MVN(*,*)] - multiple regression, ANOVA, MANOVA - Cluster, path, factor, PCA - [TIME]: univariate and multivariate time series Scale of Measure = {Ratio, Interval, Ordinal, Nominal} Discrete - Contingency table analysis (log-linear) - Poisson regression - Logistic (binomial), multinomial logit - [TIME]: Hazard or survival modeling (parametric, non-parametric) : Spatial data types : Spatial data types Spatial continuous (fields) Geostatistics SPATIAL POINT INTERACTION PATTERN ECONOMETRICS ANALYSIS MODELING Points (objects) Point Pattern Analysis Continuous [N(*,*) or MVN(*,*)] - multiple regression, ANOVA, MANOVA - Cluster, path, factor, PCA - [TIME]: univariate and multivariate time series Irregular / Regular lattice (objects) Spatial Econometrics GAM GLM Discrete - Contingency table analysis (log-linear) - Poisson regression - Logistic (binomial), multinomial logit - [TIME]: Hazard or survival modeling (parametric, non-parametric) Volume of interaction among areas Spatial Interaction Modeling 9 Common themes: Spatial process underlying observed spatial pattern Spatial variation can be decomposed into: Large scale variation: mean of spatial process z s =X s B+e s Small scale variation: covariance of spatial process Cov(e i,e j )= / Module organization
3 Concept : Spatial Scale & Extent Ratio of map units to real world units Zooming in (out) represents scale change Fixed bounding box Extent changes Associated Issues: Process scale Visual resolution Non-trivial issue in designing an analysis Spatial support ( datum ) Cross-scale interactions Concept : Connectivity Network view of geographic space Connectivity: spatial units are linked Neighborhood Everything is linked! What is the correct threshold? Generalizing space I-O reduction gives metric space What is the correct metric of connectivity? Connectivity example: Map of seven areas Connectivity example: Map of seven areas =population centroid Share border: Neighbor()={,,,} Neighbor()={,}.. Neighbor()={,,} Distance threshold: Neighbor()={,} Neighbor()={,} Neighbor()={,,} Neighbor()={,,} Neighbor()={} Neighbor()={} Neighbor()={none}
4 Concept : Aggregation & MAUP Choice of Spatial Support implies: a spatial aggregation areal values are an average of underlying points (or spatial process) a scale of analysis imposes a fixed scale conditional empirical results MAUP: Modifiable Areal Unit Problem Frame-dependence 9 SD SD SD SD SD SD SD SD SD SD SD SD
5 SD SD SD Module I review Spatial data types Process decomposition: mean + stochastic
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