GIS Fundamentals: A First Text on Geographic Information SystemsGeographic Information Systems (GIS) are computer-based tools for the entry, maintenance, and analysis of spatially-referenced data. GIS are critical for effective resource management, and have been applied across a wide range of science, business, and government endevours. This book provides an introduction to the theory and application of GIS. It is written for use in an introductory GIS class and as a reference for the GIS practitioner. This third edition balances theoretical and applied material, so that students may apply knowledge of GIS in the solution of real-world problems. Improvements over the previous editions are included in each chapter. Topics treated include an introduction to GIS, spatial data models, map projections, data entry, image data, GPS, digital data, database systems in GIS, general spatial analysis, raster analysis, terrain modeling, metadate, standards, and accuracy assessments. |
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Page 253
... variable - distance buffer . A line buffer is shown with a variable buffer dis- tance based on a river_identifier . A variable buffer distance , buffdist , is specified in a table and applied for each river segment . Layer A Layer B ...
... variable - distance buffer . A line buffer is shown with a variable buffer dis- tance based on a river_identifier . A variable buffer distance , buffdist , is specified in a table and applied for each river segment . Layer A Layer B ...
Page 338
... variable to be estimated , the cost of sampling , available resources , and the accuracy requirements of the users ... variable ( in this and other chapters , Z will be used to denote the value of a variable of interest at an x and y ...
... variable to be estimated , the cost of sampling , available resources , and the accuracy requirements of the users ... variable ( in this and other chapters , Z will be used to denote the value of a variable of interest at an x and y ...
Page 347
... variable theory , and includes three main components . The first component in the kriging model is the spatial trend , an increase or decrease in a variable that depends on direction , e.g. , tem- perature may decrease toward the ...
... variable theory , and includes three main components . The first component in the kriging model is the spatial trend , an increase or decrease in a variable that depends on direction , e.g. , tem- perature may decrease toward the ...
Contents
An Introduction to GIS | 1 |
Data Models | 23 |
Raster Geometry and Resampling | 39 |
Copyright | |
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Common terms and phrases
accuracy adjacent aerial photographs analysis applied assigned attribute data boundaries buffer distance calculated camera cartographic model cell values combined control points coordinate system cost data layer data model database datum defined described developable surface developed differential GPS digital elevation models distortion elevation data ellipsoid equations example Figure film forest functions Geographical Information Systems Geoid geometric GPS receiver identified Ikonos input layers interpolation intersection kernal land loca map projection measurements ment meters methods moving window node normal form North overlay Plane polygon positional error precise range raster cell raster data layer raster data set recorded Remote Sensing represented RMSE road sample points satellite images scale scanners second normal form selected semivariance slope soil spatial operations specified standard survey terrain third normal form tion topological typically USGS variable vertical wetlands zone