Introduction To Raster Based GIS Dr. Zhang GISC 1421 Fall 2016, 10/19
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1 Introduction To Raster Based GIS Dr. Zhang GISC 1421 Fall 2016, 10/19
2 Model of the course Using and making maps Navigating GIS maps Map design Working with spatial data Geoprocessing Spatial data infrastructure Digitizing File geodatabases Geocoding Interactive maps Map Animations Map layouts Spatial analysis 3D GIS Proximity analysis Raster analysis Analyzing Spatial data Network analysis Data mining Spatial regression
3 Outline Spatial Analyst overview Grid maps Raster layers Raster masks Kernel density smoothing Site suitability study Poverty risk model 3
4 SPATIAL ANALYST OVERVIEW GIS TUTORIAL 1 - Basic Workbook 4
5 Spatial Analyst Vector GIS Discrete spatial features including points, lines, and polygons Spatial queries, buffer analysis, overlay analysis Spatial Analyst Continuous spatial features such as elevation and incidence of diease Provide image base layers of physical features Estimate continuous surfaces from point and polygon data Combine continuous surfaces to produce indices 5
6 Spatial Analyst extension Customize, extensions Spatial Analyst Toolbar 6
7 GRID MAPS GIS TUTORIAL 1 - Basic Workbook 7
8 Grid maps Divides geographic space into uniform square or rectangular cells Each cell is given a value that describes the site, such as elevation, land use type, number of crimes, etc. 8
9 Grid map example Housing units in city of Pittsburgh Census block centroids Kernel density raster map 9
10 RASTER LAYERS GIS TUTORIAL 1 - Basic Workbook 10
11 Raster basemap Free from U.S. Geological Survey (USGS) National Elevation Dataset (NED) NED shaded relief, 1/3 arc second 11
12 Raster basemap Land use map NLCD
13 Raster layer properties All raster maps are rectangular coordinate system 13
14 Set raster environment ArcMap automatically uses the environment settings saving time Geoprocessing, environments, raster analysis 14
15 Extract land use using mask The land-use layer in your map document is a TIFF file format Need to convert to ESRI format 15
16 Hillshade raster Hillshade simulates illumination of a surface, giving it a 3D appearance Parameters Altitude of light source above surface s horizon, (default 45 ) Angle (azimuth) relative to true north, measured clockwise (default 315 ) Colors of light and shadow, shades of gray by default
17 Create hillshade raster Hillshade function 17
18 Resultant hillshade layer Original hillshade layer Better symbolized hillshade layer 18
19 Using hillshade To make a raster layer appear 3D, give it 35% transparency and place hillshade below it Land use Land use with hillshade
20 KERNEL DENSITY SMOOTHING GIS TUTORIAL 1 - Basic Workbook 20
21 KDS versus histogram Each kernel has unit area and spreads each observation out spatially Stacked bars Summed kernels
22 Kernel density smoothing Example: out-of-hospital heart attack incidences in Pittsburgh Uses point feature classes of census block centroids and out-of-hospital cardiac arrests (OHCA) Estimates the incidence of heart attacks per unit area (density) Two parameters Cell size Search radius GIS TUTORIAL 1 - Basic Workbook 22
23 Existing maps The following map display for estimated incidence using block centroids with point markers is as good as possible, but is difficult to interpret A better representation of incidence is by estimating the smoothed mean of the spatial distribution using kernel density smoothing 23
24 Existing maps Point centroids with population OHCA points 24
25 Density map Create density map for heart attack incidence Pittsburgh blocks average 300 feet per side in length 2.5 blocks is reasonable for defibrillator locations Look at areas 5 blocks by 5 blocks or 1,500 feet 150 foot cell size 25
26 Resultant density map Shown with standard deviation and green-tored color ramp 26
27 Lab and assignments Lab: Tutorial 9-1 to 9-3 Project Outline GIS TUTORIAL 1 - Basic Workbook 27
28 SITE SUITABILITY STUDY GIS TUTORIAL 1 - Basic Workbook 28
29 Site suitability study Evaluates factors for defibrillator location (e.g. commercial land use) Uses a buffer around commercial areas 29
30 Convert buffers to raster 30
31 Kernel density map Create a kernel density map to use for calculations 31
32 Calculate simple query Query kernel density map (HeartAttack) for areas that have high density and merit a defibrillator 25 block area (1,500 ft x 1,500 ft, 2.25 x 10 6 sq ft of area) 10 or more heart attacks every 5 years in locations where bystander help is possible Heart attack density: 10 heart attacks/ 2.25 x 10 6 sq ft =/
33 Reclassify settings Reclassify Tool to query for high heart attack densities 33
34 Simple query result 34
35 Calculate compound query Add second criterion: commercial buffer 35
36 Compound query result 36
37 POVERTY RISK MODEL GIS TUTORIAL 1 - Basic Workbook 37
38 Model for risk index Poverty is another risk for heart attacks Female-headed households with children Population below poverty income line Population with less than HS education Workforce of males who are unemployed How to combine these attributes into a single risk index? 38
39 Improper linear models Basic idea: Use human intelligence to select X variables to model some behavior, Y Define X so that increasing X implies increasing Y Combine standardized X variables with unit weights to predict behavior/create a risk index Standardized X (z-score) X = (X Xbar)/Stdev where Xbar = sample mean Stdev = sample standard deviation Then the predictor of Y is Yhat = (X1 + X2 + + Xn )/n (Dawes, Robyn (1979). The robust beauty of improper linear models in decision making, The American Psychologist, 572, pp )
40 Risk model base layers Raster maps can combine layers with different geographies Converts any polygons to uniform cells Blocks FHH (female headed households with children) Block groups NoHighSch2 (no high school degree) Male16Unem (males in workforce who are unemployed) Poverty (population below poverty income) 40
41 Risk model base layers Difficult to represent using vectors 41
42 Set geoprocessing options Geoprocessing, Geoprocessing options 42
43 Standardize input variables Calculate the Z-score in an attribute table of one of the input feature classes Open attribute table for AllCoBlocks Right-click FHH, Statistics Copy and paste the statistics to Notepad Copy and paste them later to the field calculator 43
44 Create new model Can create index interactively, but is a good candidate for a ModelBuilder model Provides documentation Can rerun model New toolbox and model in ArcCatalog Tool called UnweightedIndices.tbx Model called PovertyIndex (no spaces allowed) 44
45 Kernel density layers Create kernel density for first input Use FHHChild field from AllCoBlocks Cell size 150 Search radius 1,500 45
46 FHHChild kernel density map 46
47 Kernel density layers Create kernel density layers for additional inputs Block groups Search radius
48 Partial model 48
49 Weighted sum Averages kernel density maps 49
50 Model
51 Male16Unem FHHChld PovertyIndex NoHighSch Poverty
52 Poverty index map 52
53 Poverty contour Policy analysts might wish to use the poverty index density of or higher to define poverty A feature class that has the contour line for that index elevation can be created 53
54 Contour tool 54
55 Poverty contour map 55
56 Summary Spatial Analyst overview Grid maps Raster layers Raster masks Kernel density smoothing Site suitability study Poverty risk model 56
57 Lab and Assignments Lab: Tutorial 11-4 to 11-5 Assignments: Tutorial 11-6, Assignment 11-1, Due: 11/02 GIS TUTORIAL 1 - Basic Workbook 57
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