ENV102 Practical 4 worksheet

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Murdoch University *

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102

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Geography

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Dec 6, 2023

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docx

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3

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Practical 4: GIS investigation worksheet Practical class (date / time): Student name: Student no: Please submit your completed worksheet online NO LATER THAN 24 HOURS after the end of your allocated class. (The worksheet submission can be found under “Practical 4” in the “Practicals” section on the unit LMS webpage). STEP 2. Analysing the topographic/bathymetry dataset 1. Insert a copy of your map of bathymetry and topography below. Make sure you include all the annotations and contours of 0 and –200 m. 2. What is the approximate distance (in km) (east to west line) between the current coastline (0 m contour) and the ancient coastline (edge of the continental shelf) represented by the -200 m contour line? 3. Insert the land_to_sea profile below and create text annotations describing features evident in the image we have profiled (Darling Scarp, Swan Coastal Plain, shoreline, shallow nearshore waters, Rottnest Canyon, deeper waters beyond the continental shelf etc.). Note the range of elevation/depth values. What are the minimum and maximum values? Comment on the shape (steep, flat, undulating, highly variable etc.) of the profile over the ocean compared to the land component. Use your bathymetry map with the digitised line as a reference to help you determine this. 4. Insert the scarp_to_sea profile below. Note the range of elevation values. What are the minimum and maximum values? Comment on the terrain shape captured by this profile line. Is the eastern part very similar to the western part? STEP 3: Exploring Rottnest Island data 5. Insert the image created in Step 3A below and use circles or arrows to label different features. How wide (in m) is the narrowest part of Rottnest Island? How long is the island from east to west (in km)? ENV102 Foundations of the Environment
What are the X and Y coordinates of the western end of the airstrip? 6. Insert the image created in Step 3B below. Insert the land cover table created in Step 3B below. Comment on the land cover of the island. Are there many bare areas (no vegetation cover) on the island? Where are they located? 7. Insert the blended image created in Step 3C below. Where are the largest patches of dense vegetation on the island? How would you describe the shapes of these dense vegetation patches? Zoom into one example and provide approximate width and length of such a patch. What percentage of the land area is made up by dense and/or medium density vegetation? (Hint: use 1700 ha as the total land area of the island). List all classes you have included in the medium/dense vegetation category. 8. What is the total area of all bare land cover types? (Hint: 1700 ha as the total land area of the island). List all classes you have included in the bare land category. What is the total area of sparse vegetation? List all classes you have included in the sparse vegetation category. If we need ~10 trees per hectare for revegetation, how many trees would be needed to revegetate all bare (no vegetation cover) areas? How many trees would be needed to revegetate all sparsely vegetated areas? 9. Insert the blended image created in Step 3E below. How large were each of these fire scars in hectares? ENV102 Foundations of the Environment
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