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I am trying to calculate the length of lines, which were convatede before from gps to Shapefile (vector layer). I tried it with "feldrechner" (matrix calculator?) and the most time I got 0, or in the other times I got a very unrealistic result.

I also tried it with measurement of lines. There I got a good result. But I think, because of tracing the line by hand it is not so exact.

Does anybody know how I can get my exact length or/and area?

Both my results were: e.g. this result (first way): 2.74556577576214e-07 In my other way I got in this case 35,555m.

marked as duplicate by Farid Cheraghi, Mapperz Sep 10 '15 at 14:26

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    What spatial reference is your data in? it sounds like your points are geographic and your trace is projected... if you want a distance in metres then project your points into a suitable coordinate system and then try matrix calculator again. – Michael Stimson Sep 10 '15 at 4:46
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    Welcome to GIS SE! As a new user be sure to take the Tour – TsvGis Sep 10 '15 at 4:56
  • @MichaelMiles-Stimson I think your comment is worth an answer. GPS data is geographic in most cases, so unsuitable for length calculation. – AndreJ Sep 10 '15 at 8:10
  • @Miro I doubt this is the duplicate, because the length is measured, but in a wrong projection. – AndreJ Sep 10 '15 at 8:12
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    @AndreJ I think you are probably right, but still I prefer to have it covered as part of How to find line length than just having here answer as one short line "Use appropriate projection/CRS." – Miro Sep 10 '15 at 8:41

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