Rolf A. de By's Principles of Geographic Information Systems PDF

By Rolf A. de By

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4. We have already computed the average SSTs for the month December 1997, which are provided in the table below. Answer the following questions: • What is the expected average SST of the illustrated location that is precisely in the middle of the four buoys? • What can be said about the expected SST of the illustrated location that is closer to buoy B0341? Make an educated guess at the temperature that could have been observed there. 12 ◦ C zoom contents index about 63 Questions 7. 4 provides two important distinctions that are independent of each other.

2 There are in fact many different spatial interpolation techniques, not just one. 1. 1. The data representation phase deals with putting all together into a format that communicates the result of data analysis in the best possible way. Many issues come up when we want to have an optimal presentation. We must consider what is the message we want to bring across, who is the audience, what is the presentation medium, which rules of aesthetics apply, and what techniques are available for representation.

2. The real world and representations of it sented as a point, as a line or as an area. Currently, the support for image data exists but is not impressive. Some GIS applications may even be more demanding and require point representations in certain cases, and area representation in other cases. Cities on a map may have to be represented as points or as areas, depending on the scale of the map. To support this, the database must store representations of geographic phenomena (spatial features) in a scaleless and seamless manner.

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