"Scale on map varies by more than 10%, scale bar may be inaccurate" with rnaturalearth world map

[S-AQ]

Hi Dewey,

When I tried to add a scalebar to a world map of data from rnaturalearth, I got the following warning: Scale on map varies by more than 10%, scale bar may be inaccurate.

library(ggspatial)
library(rnaturalearthdata)
world_countries <- ne_countries(returnclass = 'sf')

ggplot()+
  layer_spatial(world_countries)+
  annotation_scale(location = "tl")

Somehow the annotation_scale is not aware of the specifics of the world_countries object. A similar problem occurred here, but that was never solved by anyone.
How can I get the right scale bar with this data?

[DavidBoring]

oh，I met the same question. Dear friend,Did you solve the problem?

[paleolimbot]

It's telling you that the scale bar does not necessarily apply in the same way to all areas of the map, which is true! You should probably not be putting a scale bar on a map with a scale that large (or you can accept that it is not accurate to do so and ignore the error message).

[DavidBoring]

Yes, I very much agree with what you said! I was just trying to ask you for help on GitHub and was pleasantly surprised to receive your email,thank you very much. I am a beginner in R, thanks for the answer！ ：）

---- 回复的原邮件 ---- | 发件人 | Dewey @.> | | 日期 | 2023年03月31日 22:08 | | 收件人 | @.> | | 抄送至 | @.>@.> | | 主题 | Re: [paleolimbot/ggspatial] "Scale on map varies by more than 10%, scale bar may be inaccurate" with rnaturalearth world map (Issue #109) |

It's telling you that the scale bar does not necessarily apply in the same way to all areas of the map, which is true! You should probably not be putting a scale bar on a map with a scale that large (or you can accept that it is not accurate to do so and ignore the error message).

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