Unit 4 Quiz

Question 1

Unscramble the table below by matching each task that you want to perform in the CoastWatch Data Analysis Tool (CDAT) in the left column with the software feature in the right column:

Task	CDAT Feature
Create a true color image	Drawing annotations
Draw a 1000 meter bathymetric contour	Color composite
Draw ESRI format polygon lines	Topography overlay
Label a place with its name	Shape overlay
Create a histogram plot of a rectangular area	Expression mask overlay
Highlight in pink all values greater than 20	Data surveys

Question 2

A bitmask overlay depends on several inputs: (choose all answers that apply)

• Color to mask the data pixels

• Quality variable

• Integer value to use in the bitwise AND operation

• Quality variable flag_meanings attribute

Question 3

A multilayer mask overlay is useful for:

• Looking at the individual bits stored in a quality variable

• Saving and loading multiple overlay layers

• Layering multiple variables into a composite image

• Comparing the same geographic area across multiple data files

Question 4

CDAT contains a fixed set of topographic and bathymetric contours for use in a topography overlay.

• True

• False

Question 5

A shape overlay can render data from:

• ESRI shapefiles

• KML files

• CSV files

• NetCDF trajectory files

Question 6

Help and examples for using CDAT are available: (choose all answers that apply)

• From YouTube videos

• In the user’s guide

• From in-application help within CDAT

• From the CoastWatch help desk at coastwatch.info@noaa.gov

Question 7

Overlay layers cannot be saved and used again for another data file.

• True

• False

Question 8

Performing a data survey on a variable results in: (choose all answers that apply)

• Data statistics

• An X versus Y plot

• A PDF report

• Survey extent lat/lon values

Question 9

Creating a color composite image can only be done with visible data in the 665 nm, 560 nm, and 490 nm wavelength range.

• True

• False

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