Rainbow maps contain some green adjacent to blue; which map type is this describing?

• A. Rainbow maps
• B. Variance maps
• C. Color maps
• D. Gray maps

Answer: (A)

A rainbow-style color map uses a smooth progression through colors that mirror the visible spectrum, so green and blue appear next to each other. Seeing green adjacent to blue signals that the data values are being mapped along that spectrum, from mid-range colors (green) toward higher values (blue). This adjacency is a hallmark of rainbow maps, which lay out colors in a continuous order across the spectrum.

Other map types don’t emphasize this full spectral sequence. Gray maps stay in grayscale, so you’d not see a green-to-blue transition. Variance maps color values based on variability rather than following a fixed rainbow order. A generic color map could be any palette, but it doesn’t necessarily feature the green-to-blue adjacency that defines rainbow maps.