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I am using the measurement plugin for JOSM. When using the option select everything, every road appears as selected and by using the measurement option I can obtain path length and selected area. Does this selected area displayed refers to the area of the whole osm map or just to the roads (and other ways), which are the elements that are shown as selected? |
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Neither. The area displayed by the "measurement" plugin is the sum of the areas of every closed way in your selection. That means that if two areas overlap (say, a pond inside a park), the overlapping area gets counted twice. It also means that areas formed by multiple ways (such as a city boundary defined by several roads) aren't counted at all. I don't want to hijack this thread but I use the measurement tool quite a bit but cannot seem to find a way to switch the area units from hectares to acres. Can you help?
(12 Apr '16, 00:26)
AlaskaDave
@AlaskaDave There is a ruler symbol on the bottom of the map. By clicking on it you change the units. A message explaining the change will appear. There are several units that can be chosen, click on the ruler until the one you are looking for appears.
(12 Apr '16, 08:39)
Fa__
@Carnildo Thank you for your answer. Is there a way to avoid counting twice overlapping areas?
(12 Apr '16, 08:46)
Fa__
@Fa, Thank you. That control is fairly well hidden LOL.
(12 Apr '16, 11:03)
AlaskaDave
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