1. Cartographical Whispers Dr Nigel Trodd Coventry University

2. Your (very simple) AIM: construct a map of the area between the library and Coventry Cathedral

3. You will need Blank A4 sheet Ruled A4 sheet x2 Acetate sheet Graph paper Pencil and / or Colour pens Ruler or other straight edge Common sense Start exercise

4. Task 1 Draw a sketch map of the area on one of the blank A4 sheets buildings roads, footpaths railway lines rivers bridges parks, cemeteries and open spaces trees & street furniture Etc. Pass to a neighbour

5. Task 2 Identify the entity type of each phenomenon – is it a Point Line Area Record this information on the sketch map Pass your list of entity types and the original map to a neighbour

6. Task 3 Create a vector map using the original sketch map annotated by entity type Draw the map on an acetate sheet Pass the original map, list of entity types and vector map to a neighbour

7. Task 4 Choose one feature and convert its’ vector map to a raster map Use graph paper for your raster map Allocate a code to each cell You may find it sensible to code blocks of cells. If you do, make sure that you only code square blocks. Pass the original map, vector and raster maps to a neighbour

8. Task 5 Create vector and raster data files Use the graph paper to establish a coordinate system Raster file – you will need to record information on the array size and cell resolution as well as the presence / absence of a feature in a cell. Vector file - identify the coordinates of nodes & points of all objects in a feature class. Your data file will also list object identifiers and number of coordinate pairs to ‘close’ an object. remember: raster files assume an origin in the top left (row 0, column 0), vector files in the bottom left. Pass all maps and lists to the original cartographer

9. Task 6 Do the maps look anything like your original sketch? Have the features been correctly identified and accurately located? How are complex features represented e.g. bridges, trees in open spaces, pathways alongside roads? What do you think are the main sources of uncertainty?

10. Summary Digital model of the real world: geographical phenomena spatial entities data models & data structures