GIST 4302/5302: Spatial Analysis and Modeling
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1 GIST 4302/5302: Spatial Analysis and Modeling Review Guofeng Cao Department of Geosciences Texas Tech University Spring 2016
2 Course Outlines Spatial Point Pattern Regional Data (Areal Data) Continuous Spatial Data (Geostatistical Data) Representation and Operations of Spatial Data What is Special about Spatial? Characteristics of Spatial Data and Map Projection 2/23
3 Review Map Projection Elements in map projection datum developable surface projection Distortions distance shape area direction how to choose map projections? depending on purposes, you may need to preserve a certain spatial property - most commonly shape or area - to achieve that purpose Lab Lab 1: ArcMap and map projection questions 3/23
4 What is special about spatial Characteristics of spatial data spatial (auto/cross-)correlation (spatial context or spatial pattern in different context) spatial heterogeneity Simpson paradox in a spatial setting fractal behaviors scale issues measuring the length of coastline of Maine travel traces of ants vs. elephant 4/23
5 Spatial Data Types Data types spatial point pattern areal data geostatistical data network data 5/23
6 Representation of spatial data Representations of spatial data (i.e., spatial database basics) object-based geometric primitives: points, lines and polygons convex hull, Voronoi diagram, Delaunay triangulation primitive operations: point-in-polygon, buffer spatial query and spatial join data structures for spatial data spaghetti models NAA spatial index field-based points contours raster/lattice triangulation (Delaunay triangulation) 6/23
7 Representation of spatial data Labs Lab 2: Find what s inside Lab 3: Find what s nearby Lab 4: Raster spatial analysis Lab 5: Model builder 7/23
8 Basic Probability and Statistics Statistical tools histogram mean, median, variance z-score covariance, correlation coefficient p-value QQ-plot, box-plot Pitfalls of spatial data MAUP zone effect scale effect Ecological fallacy 8/23
9 Contents in Exam II start from here 9/23
10 Spatial Point Pattern Analysis Geographic distribution mean center, median center standard distance, standard ellipsoid distance Point pattern analysis methods 1st order Quadrat methods Density estimation 2nd order nearest neighbour distance distance functions K,G,F 10/23
11 Spatial Point Pattern Analysis Hypothesis testing of CSR CSR: complete spatial randomness Hypothesis testing Monte Caro test Lab Lab 6: Point Pattern Analysis Homework assignment 11/23
12 Areal data and spatial autocorrelation Basics Spatial neighbourhood Spatial weight matrix Measuring spatial autocorrelation Joint count Moran s I and Moran s I scatter plot Getis-Ord s G and G Lab Hypothesis testing permutation test Lab 7: Exploratory analysis using GeoDa 12/23
13 Liner Regression and Spatial Regression I Linear regression Correlation (coefficient) vs. regression Simple regression vs. multiple regression Find the best fit Evaluation of the Goodness of Fit R 2 Significant test (t-test, F -test) Multiple regression Find the best fit Evaluation of the Goodness of Fit (adjusted R 2, p-value of coefficient, maximum likelihood, AIC ) Procedures for multiple regression Linear regression does not prove causal effects 13/23
14 Liner Regression and Spatial Regression II Spatial regression Spatial autoregression vs. Correlation Diagnostic of spatial dependence (autocorrelation) Spatial econometrics approaches Lag model Error model Which to use? Evaluation of Goodness of Fit (AIC) Lab Lab 8: Spatial regression using GeoDa 14/23
15 Spatial Fields Representation of spatial fields Scalar fields vs. vector fields Countours Lattice TIN Derivatives of spatial fields Gradient Slope/Aspect 15/23
16 Spatial Interpolation Spatial interpolation Deterministic interpolator Nearest neighours Natural neighours Trend surface IDW Spatial splines Triangulation Stochastic interpolator Kriging family of methods Advantage of Kriging methods over the deterministic methods 16/23
17 Geostatistics Kriging Semivariogram, covariogram Range, nugget, sill Empirical semivariogram and theoretical semivariogram models Kriging Procedures to conduct kriging Advantages of Kriging over determistic methods, such as IDW Lab Lab 9: Spatial interpolation 17/23
18 Spatial Uncertainty Characteristics of uncertainty Unavoidable Uncertainty in points, networks, area-class and DEM Assessment of impact of uncertainty and the propagation 18/23
19 Labs and software Lab topics Map projection Find what s inside Find what s nearby Model Builder Point Pattern analysis Exploratory analysis (Moran s I) Spatial regression Kriging 19/23
20 Labs and software Software ArcMap Arctoolbox: 3D analytst, spatial analysis, spatial statistics, geostatistics GeoDa (open-source) OpenStreetMap (mapathon) 20/23
21 Evaluation Project report due: May 17th before the final exam upload your project materials, including presentation, datasets and results to your folder on labmanager Exam format May 17th, 1:30-4pm, Science 234 open books and open notes, but access to any digital devices (e.g, phones, tables, computers) are not allowed multiple choices plus writing questions 21/23
22 New class and links New class avaiable at Fall Geog 5330: Applied Spatial and Spatiotemporal Data Analysis Graduate level class Map 22/23
23 Thanks Thank you, any questions/comments 23/23
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