geog255_2018-05_A01.pdf

# Display all the data in the view window to get an

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Display all the data in the view window to get an overall picture of the study area (Use the full extents icon in the toolbar it’s the one that looks like a small globe) . Explore how you can change the display order of the layers (select any layer and drag it up or down the list) 3. Change the color of the plotting symbol Explore how to change the symbols (color and size) of the gps_boat and river_banks data layers. The goal of a map is to communicate effectively and clearly the data that is being displayed. Keep this in mind as you play around with the symbols. 4. Set the map units and the display units Find out how to set the map units and display units of the map. The map units are the actual units that the data is stored in depending on its projection. The display unit is the unit that distances, areas, etc. are measured in when read from the computer screen. 5. Examine the attribute table of the GPS data file Examine the attribute table of the gps_boat file (select the data layer | right click | select attribute table). What is the maximum elevation recorded? What time did the GPS measurements begin and end? Identify two inconsistencies you observe in the GPS data attribute file. 6. Simple calculations from the attribute table If the boat is traveling at a constant speed of 25 km/hr in the river, and you know the start and end times of the GPS measurements, find the distance along the river between the first and last GPS measurements. (hint: use the equation speed = distance / time ). How can you verify whether this value is correct or not?

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