Download Open Source GIS: A GRASS GIS Approach by Markus Neteler, Helena Mitasova (auth.) PDF
By Markus Neteler, Helena Mitasova (auth.)
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Additional resources for Open Source GIS: A GRASS GIS Approach
In the interactive mode, you just type the command and you will be prompted for map layer names, options, and parameters. To save space, we will use the command line throughout this book, however, you are encouraged to experiment with all three approaches a choose the most convenient one for your work. ). The first letter refers to the function class, followed by a dot and one or two other words, again separated by dots, describing the specific task performed by the module. 2 lists the most important function classes.
Vector data are most efficient for features which can be described by lines with simple geometry, such as roads, utility networks, property boundaries, building footprints, etc. Continuous spatial data can be represented by isolines or various types of irregular meshes using the vector data model, however such representations usually lead to more complex algorithms for analysis and modeling. 1 introduces 3D multiattribute vector data. Point data. Point data model is a special case of the vector data model.
The map layers can then be combined to create different types of new maps as well as to perform analysis of spatial relations. GRASS and most of the proprietary GIS products are based on this data organization. For certain applications, especially those based on discrete, object based representation of geographical features, object oriented approach to data management is used. Within this approach data are stored as closed objects with coordinates and attribute information. Objects include characteristics and meth- 26 OPEN SOURCE GIS ods.