1. What is the nearest residential area to the debris flow site?

Optional solution: Measure distance

Dataset 1: Debris flow site (can be represented by polygon or point data, depending on the scale)

Dataset 2: Residential area distribution in the region

Result: Recorded in the attribute table.

 

2. What are the two nearest supermarkets within 2 km from the National Stadium?

 

Optional solutions: Find closest facility or distance query

(1) Find closest facility

Required data: Road network around the National Stadium (line), Olympic venues distribution map, supermarket distribution map (point)

Steps and key parameter settings:

Build road network using round-trip distance of each road segment as bidirectional resistance fields;

Select the National Stadium location from the Olympic venues map directly or via SQL query as the event point;

Use supermarket locations as facility points. Set number of facilities to 2.

Start searching from event point to facility points within 2 km radius.

(2) Distance query

Required data: Olympic venues distribution map, supermarket distribution map (point)

Steps and key parameter settings:

Select the National Stadium location from Olympic venues map directly or via SQL query;

Set supermarket map as target layer and use distance query tool with 2 km range.

Comment: The first solution is more practical as it considers actual road conditions, while the second finds spatial proximity which may not reflect actual accessibility.

 

3. How to visualize coverage ranges of mobile signal towers with decreasing intensity levels in an area?

 

Optional solution: Multiple ring buffer (assuming signal strength decreases with spatial distance)

Required data: Signal towers (point)

Steps:

Create multiple ring buffers at specified distance intervals, using color gradients from dark to light to represent intensity levels.

 

4. How many food processing plants are within 1000 meters of a polluted river?

 

Optional solution: Distance query with attribute filtering

Required data: River distribution map (line/polygon), factory distribution map (point)

Steps and key parameter settings:

Select the polluted river as query object and set factory layer as target;

Apply attribute filter: Build SQL expression to select food processing plants;

Set query distance to 1000m.

 

5. For football stadiums and hotels in Switzerland displayed on separate layers, what's the distance from each hotel to the nearest stadium?

 

Optional solution: Measure distance

Dataset 1: Hotel distribution map (point)

Dataset 2: Football stadium distribution map (point)

Result: Stored in the attribute table where each hotel record will store the nearest football stadium and distance.