Dr. Simwanda, Dr Ranagalage, and Dr. Murayama study the development of urban heat islands in major metropolitan areas across the globe. Examine their heat map of Nairobi, the capital city of Kenya. The colors represent temperature variation across Nairobi (deg C) according to the color legend beneath the figure. Select the letter that represents the portion of the city that has the least tree coverage.

Source: https://doi.org/10.3390/rs11141645
Links to an external site.

Question

Dr. Simwanda, Dr Ranagalage, and Dr. Murayama study the development of urban heat islands in major metropolitan areas across the globe. Examine their heat map of Nairobi, the capital city of Kenya. The colors represent temperature variation across Nairobi (deg C) according to the color legend beneath the figure. Select the letter that represents the portion of the city that has the least tree coverage. Source: https://doi.org/10.3390/rs11141645 Links to an external site. 单项选择题

A

B

C

D

Source: https://doi.org/10.3390/rs11141645
Links to an external site.

BlackTom AI · Accepted Answer

To tackle this item, I’ll walk through what each labeled area represents in the Nairobi heat map and how tree cover typically affects color on such maps.
Option A: The A region appears in cooler colors (greens) relative to the surrounding areas. In heat-misrepresented color ramps, green often corresponds to more vegetation and thus more tree cover, so A is suggesting a relatively higher tree density compared with redder areas. This makes A unlikely to be the area with the least tree cover.
Option B: The B region shows warmer colors (yellows to light oranges) than A. Warmer colors usually indicate higher temperatures, which can be associated with fewer trees, but B still isn’t the most extreme warm color in the map’s range. Therefore B is not the region with the absolute least tree coverage if the map’s legend spans from cooler greens to hottest reds.
Option C: The C region shifts further toward the warmer end (orange to red) of the spectrum, indicating substantially reduced tree cover relative to greener zones. This makes C a plausible candidate for low tree density, yet we must compare it with D to determine the least tree cover.
Option D: The D region sits at the hottest end of the color scale (deep orange/red) in the provided map snippet. In these heat-maps of urban areas, the light-to-dark progression typically places the least vegetation, including tree canopy, where temperatures are highest and colors shift toward red. Therefore, D is the area most likely to have the least tree coverage among the labeled zones.
In summary, A shows more vegetation (cooler greens), B and C show progressively less vegetation but not as extreme as D, and D aligns with the map’s highest temperatures, which correspond to the least tree cover. The question asks for the portion with the least tree coverage, and the color coding strongly points toward D as the most vegetation-sparse area on this map.

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