This layer shows the land-based travel time, in minutes, from each pixel to the nearest city with a population of at least 50,000 inhabitants. It is derived from the Oxford Malaria Atlas Project 'Accessibility to Cities' dataset (Oxford/MAP/accessibility_to_cities_2015_v1_0) on Google Earth Engine, at roughly 1 km resolution for the 2015 reference year. Low values (green) mark well-connected urban and peri-urban areas, while high values (red) mark remote, hard-to-reach locations.
The indicator measures the shortest land-based travel time (in minutes) from each location to the nearest city of 50,000 or more inhabitants. It is read directly from the Oxford Malaria Atlas Project global 'Accessibility to Cities' product, which combines a global friction surface (road networks, terrain, and land cover) with a least-cost path algorithm over urban destinations. It is a static 2015 snapshot.
| Code | Provider | Resolution | Year |
|---|---|---|---|
| Oxford/MAP/accessibility_to_cities_2015_v1_0 | Oxford Malaria Atlas Project (via Google Earth Engine) | ~1 km | 2015 |
Method: The 'accessibility' band is clipped to the area of interest, reprojected, and sampled at 1 km scale; per-geometry statistics (minimum, maximum, and mean travel time in minutes) are computed over valid pixels, with negative values treated as no-data. The colour ramp runs from green (short travel time, accessible) through yellow to red (long travel time, remote), normalised over 0 to 360 minutes.