18表面分析学生阅读资料.pptVIP

IGC Korea, 2000 Analysis of surface accessibility for surface modelling in GIS Young-Hoon Kim and Graham Clarke {pgky,graham}@geog.leeds.ac.uk School of Geography University of Leeds Leeds, LS2 9JT England, United Kingdom Accessibility, Surface model, spatial analysis, and GIS Accessibility A core concept in geography, geographical models and even GIS spatial analyses Aim: Where is the most accessible areas from demand / supply? 2 dimensional geographical location context: x y co-ordinates Surface model A core GIS modelling part 3 dimensional spatial object representation (x, y, and z value) Spatial analysis and GIS for surface models Spatial interpolation, TIN, slope, intervisibility, hillshade, etc Discussions Spatial models vs. GIS (for spatial modelling) Spatial modelling view (non-GIS basis) ; solution quality GIS view: computing performance (visualisation ? analysis) Surface aspects for accessibility measurement Accessibility and surface model The matters of measurement and estimation of surface accessibility How to tackle spatial dimensional complexity (X, Y, and Z axis) How to define x and y locations? (e.g. grid centroid) How to measure grid distance? (Euclidean or network, or others) How to estimate Z value at surface topology? How to measure Z value variation: up-hill and down-hill concept Few spatial modelling techniques in surface models of GIS have existed to tackle these matters!!! Objectives So, this paper will explore that ……… Explore dimensional effects in accessibility measure on surface topology The different accessibility landscapes on 2-D and 3-D space Why GIS models have been stuck in 2-D based modelling position? Explore efficient accessibility methods for surface modelling and GIS Why surface accessibility needs? How to compute surface accessibility in geographical modelling system? Show maps of 3-D surface accessibility model How to tackle big data size and computational performance? Exploit surface accessibility control point method