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Are these differences errors or there are formal reason for them? Look at the extract in the permalink:

As an experienced mapper, I can understand the sharp cut on the white holes, displaced country border... but I dont understan the color differences for the (obviously) same area object types (light and dark green), the horizontal/vertical tile/grid lines, the very weak contrast between the light-green and light-blue... As I undestand, the SlippyMap is OSM's reference map and should be (among) the best maps created on the most recen/valid OSM source data.

asked 12 May '13, 10:59

sanser's gravatar image

accept rate: 5%

The darker green comes from a landuse=forest relation and the lighter green from a natural=wood relation. Additionally there is a boundary=national_park / leisure=nature_reserve combination rendered as an area with many "NR" labels and to the west there is a boundary=national_park without the leisure=nature_reserve tag but with a leisure=park tag resulting in an even lighter green. Somewhat confusing but that's what you get if you want to render many different tags.

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answered 12 May '13, 12:22

scai's gravatar image

scai ♦
accept rate: 23%

edited 12 May '13, 20:13


This comes back to the conflicting interpretations of landuse=forest vs natural=wood. In this case they really should be tagged the same on each side of the border, but different mappers follow different conventions.

I keep pushing for the "landuse=forest is for forestry activity" interpretation, but some people use another interpreation, many people dont know/care, and many areas are hard to judge either way. Sigh...

(14 May '13, 10:46) Vincent de P... ♦

It's worse than you think: a lot of US forests are just land which is designated National Forest and run by the Forest Service. In many cases there is nary a tree in sight, although this area is mainly forested, but there are gaps Note the miasalignment of US/Canadian border. North Cascades National Park was also tagged leisure=park (I removed it).

(14 May '13, 11:04) SK53 ♦

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question asked: 12 May '13, 10:59

question was seen: 3,029 times

last updated: 14 May '13, 11:04

NOTICE: is no longer in use from 1st March 2024. Please use the OpenStreetMap Community Forum