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Service Description: https://map.ox.ac.uk/research-project/accessibility_to_cities/
unit: minutes This global accessibility map enumerates land-based travel time to the nearest densely-populated area for all areas between 85 degrees north and 60 degrees south for a nominal year 2015.
These datasets were each allocated a speed or speeds of travel in terms of time to cross each pixel of that type. The datasets were then combined to produce a “friction surface”, a map where every pixel is allocated a nominal overall speed of travel based on the types occurring within that pixel. Least-cost-path algorithms (running in Google Earth Engine and, for high-latitude areas, in R) were used in conjunction with this friction surface to calculate the time of travel from all locations to the nearest city (by travel time). Cities were determined using the high-density-cover product created by the Global Human Settlement Project.
D.J. Weiss, A. Nelson, H.S. Gibson, W. Temperley, S. Peedell, A. Lieber, M. Hancher, E. Poyart, S. Belchior, N. Fullman, B. Mappin, U. Dalrymple, J. Rozier, T.C.D. Lucas, R.E. Howes, L.S. Tusting, S.Y. Kang, E. Cameron, D. Bisanzio, K.E. Battle, S. Bhatt, and P.W. Gething. A global map of travel time to cities to assess inequalities in accessibility in 2015. (2018). Nature. doi:10.1038/nature25181.
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Service Item Id: 5345b39bffb549a189f80aeaecde8047
Copyright Text: Weiss et al (2018)
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Comments: FL2000: IFL areas that were fragmented or degraded by the year 2013
IFL2013 : IFL areas that were fragmented or degraded by the year 2016
IFL2016: IFL areas for the year 2016
http://intactforests.org/shp/IFL_2018_readme.pdf
Potapov P., Yaroshenko A., Turubanova S., Dubinin M., Laestadius L.,
Thies C., Aksenov D., Egorov A., Yesipova Y., Glushkov I., Karpachevskiy
M., Kostikova A., Manisha A., Tsybikova E., Zhuravleva I. 2008. Mapping
the World's Intact Forest Landscapes by Remote Sensing. Ecology and
Society, 13 (2)
Subject: Intact Forest Landscapes Data: forest area change 2000-2016
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Keywords: urbanization; travel time; human impact; wilderness; infrastructure; acessability
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