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Using QGIS, is it possible to reduce the number of contour lines in a hypsography (topographic) layer? Mine has them every 5 meters, which is more than I need and it makes the map awfully busy.

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marked as duplicate by underdark Feb 27 '13 at 17:06

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up vote 2 down vote accepted

Do you have the contour elevation as an attribute? If so, you could work on a selection method to select only those that are multiples of 10m, for example. An easy way to do this is to use a python calculator to calculate a new field that returns the modulo (remainder) of the elevation field divided by 10.

eg: modulo = elevation % 10

You can then do a definition query on your data so that it will only display those where the modulo field = 0.

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Yes, that sounds like an idea worth looking into. Thanks. – TVZ Feb 28 '13 at 21:45

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