Browsing by Author: Dassau, Otto

BasicTutorial
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Sutton, Tim; Dassau, Otto; Sutton, Marcelle (2011-08-08) - Basic
Understand interpolation as part of spatial analysis. Spatial interpolation is the process of using points with known values to estimate values at other unknown points. In this worksheet we describe interpolation in more detail and give some examples of how it can be useful.
BasicTutorial
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Sutton, Tim; Dassau, Otto; Sutton, Marcelle (2011-08-08) - Basic
Understanding what GIS is and what it can be used for. With a GIS application you can open digital maps on your computer, create new spatial information to add to a map, create printed maps customised to your needs and perform spatial analysis. In this worksheet we explore the basic concepts behin...
BasicTutorial
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Sutton, Tim; Dassau, Otto; Sutton, Marcelle (2011-08-08) - Basic
Understanding of vector data models as used in GIS. Vector data provide a way to represent real world features within the GIS environment. A feature is anything you can see on the landscape such as houses, roads, trees, rivers, and so on. Each one of these things would be a feature when we represe...
BasicTutorial
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Sutton, Tim; Dassau, Otto; Sutton, Marcelle (2011-08-08) - Basic
Understanding the role of attribute data in a GIS. Attribute data describe features. Attribute data can help us to make interesting and informative maps, and perform spatial analysis in a GIS application. In this topic we describe how attribute data are associated with vector features and can be u...
BasicTutorial
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Sutton, Tim; Dassau, Otto; Sutton, Marcelle (2011-08-08) - Basic
Learn how to create and edit vector and attribute data. In the previous two topics we looked at vector data. We saw that there are two key concepts to vector data, namely: geometry and attributes. The geometry of a vector feature describes its shape and position, while the attributes of a vector f...
BasicTutorial
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Sutton, Tim; Dassau, Otto; Sutton, Marcelle (2011-08-08) - Basic
Discover the different kinds of raster data and how they can be used in a GIS. Raster data are arranged in a matrix of cells. Each cell in the matrix has a value. When viewed as a whole the raster looks like an image. In this worksheet we take a closer look at raster data.
BasicTutorial
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Sutton, Tim; Dassau, Otto; Sutton, Marcelle (2011-08-08) - Basic
Topology defines the relationship between vector features. In this topic we look at how topology is used in a GIS, and the differences between topological and non topological datasets. We also look at how topological concepts can be used to improve the digitising process.
BasicTutorial
Coordinate Reference Systems (CRS) provide a system for specifying location. In this topic we explore why CRS are needed and look more closely at the advantages and disadvantages of different CRSes.
BasicTutorial
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Sutton, Tim; Dassau, Otto; Sutton, Marcelle (2011-08-08) - Basic
Understanding map production for spatial data. Map production is the process of arranging map elements on a sheet of paper in a way, that even without many words a layperson understands what it is all about. Maps are very often produced for presentations and reports where the audience or reader is...
BasicTutorial
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Sutton, Tim; Dassau, Otto; Sutton, Marcelle (2011-08-08) - Basic
Understand the use of buffering in vector spatial analysis. Spatial analysis uses spatial information to extract new and additional meaning. Usually spatial analysis is carried out using a GIS Application. A GIS provides normally has spatial analysis tools for feature statistics (e.g. how many ver...