By Francis Harvey PhD
This pragmatic ebook introduces key recommendations and abilities to organize scholars to appreciate and use geographic details structures (GIS). The textual content completely explains what geographic info is, the way it is represented and analyzed, and what it communicates approximately human and environmental actions and occasions that occur on our planet. easy ideas of map making and map analyzing are built-in with discussions of appropriate details applied sciences and functions. Written in an available variety, the textual content is prepared into 4 components that may be utilized in any series in entry-level and extra really good GIS classes. effortless gains contain sensible examples and workouts, enticing vignettes, and invaluable web assets.
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Additional info for A Primer of GIS: Fundamental Geographic and Cartographic Concepts
The points tested are only the well-defined points, which leaves open the possibility that less well-defined points are far less accurate. In terms of positional accuracy, it would be too easy to simply say that an accuracy standard means you know what you’re getting. Remember that the actual location of these points could be anywhere within the areas indicated. In this sense, while the positional accuracy standard is a quantitative measure, its interpretation is often very qualitative unless exhaustive measure is made.
Meaning is more than the sum of attributes collected in the data, but arises in consideration of relationships in the data and relationships to other data and the context (broadly defined). Again, information has some meaning, but data only holds the potential of gaining meaning. If you take geographic information to another place or context, most people will still call it information because of its meaning potential. This often gets confusing. To be specific, at least to summarize the discussion here, data can be (and often is) called information, but unless it has some meaning, it has reverted to the status of data.
5. Is every map reliable enough for every use? No, maps are abstractions that focus on a selection of things and events from the endless complexity of the world. 6. How do representation and communication relate to each other? Representation is the basis for communication. It is impossible to have a cartographic representation of what is missing from a geographic representation. 7. Why can’t GI or a map show everything in any chosen area without distortion? Maps must abstract, which leads to distortions.