Correction to: Scientific Data https://doi.org/10.1038/s41597-020-0567-7, published online 13 July 2020

The legend of Fig. 1 has been updated to include the following text acknowledging the source and copyright of the background map image:

“The background map image where the samples are represented is the intellectual property of Esri and used herein under license. Copyright © 2019 Esri and its licensors. All rights reserved.”