ECFAS E-Learning Module

JavaScript isn't enabled in your browser, so this file can't be opened. Enable and reload.

SHORELINE AND ANALYSIS EXTRACTION TOOL

Test how much you have learned after following the e-learning module.

1. What is the revisit time for the combined Sentinel-2 satellites?

1 point

A. 10 days

B. 5 days

C. 16 days

D. 8 days

2. What is the revisit time for the combined Landsat-8 and Landsat-9 satellites?

1 point

A. 10 days

B. 5 days

C. 16 days

D. 8 days

3. Which types of studies can be carried out using SAET?

1 point

A. Only Impact analysis

B. Only analysis of impacts caused by natural events

C. Impact analysis and time series analysis

D. Only analysis of impacts caused by anthropogenic events

4. Why is the monitoring of beach areas important?

1 point

A. Beaches constitute the most important source of economic income from tourism.

B. Beaches are highly dynamic and changing natural environments that provide protection to the coast, habitat for unique species and constitute a basic recreational resource for coastal societies.

C. Due to climate change, beach areas may retreat or even disappear.

D. It is not necessary to monitor the beach areas, as these sectors tend to recover their natural balance over time.

5. Which type of satellite images are used as inputs by SAET?

1 point

A. Landsat 8-9 and Sentinel 1-2

B. Sentinel 2 and Landsat 8-9

C. Sentinel 2, Landsat 8-9 and the beach polygon areas for the Coastal Zone

D. Sentinel 2, Landsat 8-9 and Spot.

6. How many kilometres can a single Sentinel 2 tile cover?

1 point

A. 290

B. 180 x 185

C. 185 x 180

D. 100 x 100

7. What is a water index?

1 point

A. Mathematical operation where several bands of an image are combined to highlight the water areas from the land areas.

B. Mathematical operation where several bands of an image are combined to highlight the water areas from the cloudy areas

C. Combination of two bands, normally the red and the near-infrared bands, in order to highlight the water areas from the land areas.

D. Probability of a pixel being water or land after a classification.

8. What is the band that SAET uses in combination with the approximate pixel shoreline (APS) to obtain the sub-pixel shoreline?
*

1 point

A. SWIR-1 band

B. Near-infrared band

C. SWIR-2 band

D. Blue band

9. Why does SAET use the beach polygon areas from the Coastal Zone? *

1 point

A. To avoid the shoreline extraction in coastal rigid areas.

B. To remove from the APS those pixels that are inside the beach areas.

C. To focus the shoreline extraction process only in beach areas.

D. To be more cost-effective in processing time.

10. What is the difference between Sentinel-2 1C (TOA) and 2A (BOA) products?

1 point

A. 1C images are corrected at Top-Of-Atmosphere level, whereas 2A images are corrected at Bottom-Of-Atmosphere level, removing the atmospheric effect.

B. 1C images store the reflectance values at Top-Of-Atmosphere level, without any atmospheric correction, whereas 2A images store the corrected reflectance values at Bottom-Of-Atmosphere level, removing the atmospheric effect.

C. 2A images store the reflectance values at Top-Of-Atmosphere level, without any atmospheric correction, whereas 1C images store the corrected reflectance values at Bottom-Of-Atmosphere level, removing the atmospheric effect.

D. 2A images are corrected at Top-Of-Atmosphere level, whereas 1C images are corrected at Bottom-Of-Atmosphere level, removing the atmospheric effect.

11. Let’s suppose that we want to download several images to be processed later (not immediately). Which and in what order will be the most suitable run modes in SAET?

1 point

A. 1) Only searching; 2) only downloading; 3) downloading and processing

B. 1) Only searching; 2) only downloading; 3) only processing

C. 1) Only searching; 2) only processing

D. 1) Only searching; 2) downloading and processing

12. After the installation, what is mandatory to run SAET?

1 point

A. Obtaining the credentials of user from Copernicus Open Access Hub and the USGS EROS service.

B. Knowledges in python language.

C. Having at least 1GB of free storage in your hard drive device.

D. Obtaining the credentials of user from Copernicus Open Access Hub, USGS EROS service and the machine-to-machine service.

13. In how many ways can we indicate to SAET the area of interest for the shoreline extraction? (parameter ‘--fp‘) *

1 point

A. Two ways: json file and coordinates (minimum longitude, minimum latitude, maximum longitude, and maximum latitude)

B. Three ways: json file, coordinates (minimum longitude, minimum latitude, maximum longitude, and maximum latitude) and the value ‘NONE’.

C. Three ways: json file, coordinates (minimum longitude, maximum longitude, minimum latitude, maximum latitude) and the value ‘NONE’.

D. Three ways: txt file, coordinates (minimum longitude, minimum latitude, maximum longitude, and maximum latitude) and the value ‘NONE’.

14. Which type of results does SAET offer after being run in ‘Only searching’ mode? *

1 point

A. Two types of results: text result on the terminal window and visual result on a html file.

B. Three types of results: image name, cloud coverage percentage and the difference in days between the image and the date of the storm peak.

C. An html file containing the thumbnails of all found images.

D. The extracted shorelines in two types of geometries: points and lines.

15. What happens if a Sentinel 2 image is in ‘offline’ mode? *

1 point

A. The image cannot be processed by SAET.

B. SAET requests automatically the image and wait until it is available.

C. The user must activate the image from the Copernicus server and wait until it is available to run SAET.

D. There is no problem, because SAET can process both, ‘online’ and ‘offline’ images.

16. If we compare the position of the pre-storm and post-storm shorelines against a reference line, what is the meaning of negative values in the expression ‘post-storm – pre-storm’? *

1 point

A. Depending on the number of sectors in the reference line, the negative values would mean erosion or accretion processes.

B. It is not possible to have negative values.

C. Negative values mean accretion processes.

D. Negative values mean erosion processes.

17. Which types of shoreline are extracted by SAET? *

1 point

A. Instantaneous shorelines.

B. Shorelines corrected by the tide effect.

C. Shorelines corrected by the tide and run-up effects.

D. The averaged shoreline between pre-storm and post-storm position.

Submit

Clear form

This content is neither created nor endorsed by Google. Report Abuse - Terms of Service - Privacy Policy

Forms