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Visualizing Nepal Earthquake Epicenters and Districts with Different Symbolization, Exercises of Earth Sciences

Prescott CollegeEarth Sciences

Instructions on how to modify an online map of Nepal earthquake epicenters to meet the requirements of the United Nations Disaster Assessment and Coordination (UNDAC) team. The map should display all 2015 earthquake epicenters at all scales, show all 75 districts by population, and display all recorded earthquakes with a magnitude of 5 or above. The document also explains how to change the symbolization of the map to display districts by population using a choropleth map and how to filter the earthquakes to show only those with a magnitude of 5 or above.

What you will learn

  • How can the symbolization of the map be changed to display districts by population?
  • What are the specific requirements of the UNDAC team for the Nepal Earthquake Epicenters map?
  • How can the Nepal Earthquake Epicenters map be modified to meet the requirements of the UNDAC team?

Typology: Exercises

2021/2022

Uploaded on 09/12/2022

brittani
brittani 🇺🇸

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The Nepal Earthquake Epicenters map shows
epicenters of the earthquakes that occurred in
and around Nepal. The year of the earthquake,
its epicenter, and its magnitude can be viewed by
clicking the points on the map. The points are also
symbolized by the magnitude of the earthquake.
The district divisions can be seen on the map
as outlines. In this lesson you will see how the
data can be displayed differently by changing
the symbolization of the map, which will allow
the viewer to visualize and observe even more
information.
Build skills in these areas
Opening and modifying an existing online map
Changing transparency
Changing style to unique values
Changing style to Counts and Amounts
Changing size and color of symbols
What you need
Account not required
Estimated time: under 30 minutes
Analyzing Nepal earthquake
epicenters
Account not required
1
pf3
pf4
pf5

Partial preview of the text

Download Visualizing Nepal Earthquake Epicenters and Districts with Different Symbolization and more Exercises Earth Sciences in PDF only on Docsity!

The Nepal Earthquake Epicenters map shows epicenters of the earthquakes that occurred in and around Nepal. The year of the earthquake, its epicenter, and its magnitude can be viewed by clicking the points on the map. The points are also symbolized by the magnitude of the earthquake. The district divisions can be seen on the map as outlines. In this lesson you will see how the data can be displayed differently by changing the symbolization of the map, which will allow the viewer to visualize and observe even more information. Build skills in these areas  Opening and modifying an existing online map  Changing transparency  Changing style to unique values  Changing style to Counts and Amounts  Changing size and color of symbols What you need  Account not required  Estimated time: under 30 minutes

Analyzing Nepal earthquake

epicenters

Account not required

Scenario The United Nations Disaster Assessment and Coordination (UNDAC) team members need an emergency response system map to respond to the Nepal earthquake. They have seen the original Nepal Earthquake Epicenters map and are impressed. However, for their immediate need, they have asked that the map be altered to show the following:

  • The epicenters of the 2015 earthquakes must be seen at all scales.
  • All 75 districts should be shown by population.
  • All recorded earthquakes with a magnitude of 5 and above should be shown. On the Richter scale, earthquakes above 5 can be felt by everyone and can cause slight damage to all buildings.
  1. Click the Nepal Earthquake Epicenters map.
    1. In the upper right corner, click Modify andthen ClickContentsunder Details.. Map As you zoom in and out of the map you can see that the Nepal Earthquake 2015 layer disappears and appears according to the scale of the map. The UNDAC wants this layer visible at all times.
  2. Click the three dots at the end of the NE 0425 layer. This layer shows the epicenters of the earthquakes.
  3. Go to Set Visibility Range.
  4. Move the slider to the left to set the visibility to the World. This makes this layer visible at all scales. 6. Again, click Contents under Details if the content pane collapses. 7. Type Nepal in the search window and the map will zoom to the extent of Nepal and display the 75 districts. The 75 districts are shown, but only their outlines are visible. All values of the districts look the same, which means they are classified on the map as location and only show you the distribution of the data.
  1. Click District and click Change Style. a. Under Choose an Attribute to Show, select POP_91. Notice that the display changes from unique symbology for each district to a range of colors representing the population density. Darker colors showing higher population and lighter lower population. b. Click Done.
  2. Uncollapse the District layer to see the legend.
  3. Right-click the District layer and select Create Labels to label the districts by name.
  4. Write a brief explanation of how the legend helps you understand the map. What does the legend show about the population? Your last task for the UNDAC is to show only the earthquakes with a magnitude of 5 and above. You want only the values of 5 and above to be shown on the map.
  5. Click NepalEarthquake2015 and go to Change Style.
  6. Click the Counts and Amounts (Size) options.
    • Scroll down and change the classes to 2.
    • Move the slider to 5. This shows values 0–5 in one class and 5 and above in the Other class.
  1. Click Legend. You might have to expand the style pane to see the legend.
  2. Click 0 to 5.
  3. Click Fill and choose No Color.
  4. Click Outline and choose No Color.
  5. Click OK. This leaves only the earthquakes with a magnitude of above 5 shown on the map.
  6. Click 5 to 7.5.
  7. Click Symbol, change the size of the symbol to 30, and choose a distinct symbol.
    1. Click OK. Where on the map are the earthquakes with a high magnitude in relationship to a district with a high population?
    2. Check off the District layer and observe the basemap layer. What would make rescue efforts difficult in the northern districts?