By T. Sutton, O. Dassau, M. Sutton
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Additional resources for A Gentle Introduction to GIS
If an area is completely covered with grass, give it a value of 2. Now use pencil crayons to colour the cells based on their values. Colour cells with value 2 dark green. Value 1 should get coloured light green, and value 0 coloured in brown. When you finish, you should have a raster map of your soccer field! 57 Further reading: Book: ● ● Chang, Kang-Tsung (2006): Introduction to Geographic Information Systems. 3rd Edition. McGraw Hill. (ISBN 0070658986) DeMers, Michael N. (2005): Fundamentals of Geographic Information Systems.
McGraw Hill. (ISBN 0070658986) DeMers, Michael N. (2005): Fundamentals of Geographic Information Systems. 3rd Edition. Wiley. org/wiki/GIS#Raster The QGIS User Guide also has more detailed information on working with raster data in QGIS. What's next? In the section that follows we will take a closer look at topology to see how the relationship between vector features can be used to ensure the best data quality. 58 GIS for Educators Topic 6: Topology Objectives: Understanding topology in vector data Keywords: Vector, topology, topology rules, topology errors, search radius, snapping distance, simple feature Overview: Topology expresses the spatial relationships between connecting or adjacent vector features (points, polylines and polygons) in a GIS.
Images with a single band are called grayscale images. ● Single band, grayscale images can be shown in pseudocolour by the GIS. ● Raster images can consume a large amount of storage space. Now you try! Here are some ideas for you to try with your learners: ● ● Discuss with your learners in which situations you would use raster data and in which you would use vector data. Get your learners to create a raster map of your school by using A4 transparency sheets with grid lines drawn on them. Overlay the transparencies onto a toposheet or aerial photograph of your school.