Question

In the image shown below, what is the depth of the ocean bottom below the boat? The tan plane represents a depth of 6 meters.
boat measuring ocean depth
2 meters
3 meters
4 meters
5 meters
In the 3D map shown below, what is the depth of the area marked by the red "x"?
3D map
1 m
2 m
3 m
4 m
What is the maximum depth shown on the 3D map below?
Partial 3D map
1 m
2 m
3 m
4 m
What would the TABLE pane corresponding to the 2D MAP shown below look like?
ocean depth map

table of ocean depths

table of ocean depths

table of ocean depths

table of ocean depths
Suppose a boat needs to travel in water with a depth of at least 3 meters. Given the two-dimensional ocean depth map shown below, which of the following would be the safest path for the boat to travel, west-to-east, across this ocean?
ocean depth map
straight across at 30.4° N latitude
straight across at 30.3° N latitude
straight across at 29.5° N latitude
diagonally from the top left corner (30.4° N, 90.4° W) to the lower right corner (29.5° N, 89.5° W)

Answer 1

I can’t see the images you’re referring to. Please upload the four maps/screenshots (or give a precise textual description of them: the contour/colour legend, the numeric labels at known points, and where the boat / red X / area of interest sit). Once I have the images (or those numbers) I’ll give the exact answers.

Meanwhile, here’s how to answer each type of question yourself so you can check or tell me the numbers I need:

1) Depth below the boat when “the tan plane represents a depth of 6 meters”
- Find the vertical distance between the tan plane and the ocean bottom at the boat’s location. If the bottom at the boat’s location is labeled (or you can read a contour/colour for it), subtract the plane’s depth from the bottom depth OR compare the bottom depth to 6 m (depending on how the diagram is drawn).
- Example interpretation possibilities:
- If the tan plane is at depth = 6 m and the bottom at the boat is at 4 m, the bottom is shallower than the plane (4 m), so the depth below the boat = 4 m.
- If the bottom is 8 m and the plane is 6 m, the bottom is deeper (8 m).
- In short: read the numeric depth where the boat sits (or where the bottom intersects the vertical shown) and choose that option.

2) Depth at the red “x” on a 3D map
- Use the map’s legend or the vertical scale (colours or z-values shown on axes) to read the depth at the red x.
- If the 3D surface has tick labels on the vertical axis, read off that z-value directly. If colours are used, match the colour at the x to the legend.

3) Maximum depth on the 3D map
- Scan the legend for the largest depth value or find the lowest point on the surface (visually the deepest depression) and read its depth from the colour legend or z-axis ticks.

4) What the TABLE pane for a 2D MAP looks like
- The TABLE (attribute table) for a gridded/depth map typically lists grid cell centers or points with fields like:
- ID (cell number)
- Latitude (or Y)
- Longitude (or X)
- Depth (meters)
- Example small table structure:
ID | Latitude | Longitude | Depth_m
1 | 30.4 N | 90.4 W | 4
2 | 30.4 N | 90.3 W | 3
... and so on for each cell.

5) Safest west-to-east path needing at least 3 m depth
- For each candidate path (a latitude line or diagonal), sample depths along that path (at least at each grid cell intersection or at contours) and ensure every sampled depth ≥ 3 m.
- If even one sampled point along a path is < 3 m, that path is unsafe.
- To decide between several latitude lines, choose the one where all depths along the east–west transect are ≥ 3 m (or choose the diagonal only if every point along the diagonal meets the threshold).

If you upload the images (or paste the numeric grid/legend), I’ll read them and give the exact multiple-choice answers and the complete attribute table.