New answers tagged tilemill
Solved! this is how I did it: Open attribute table - add new column with integer as type. I left lenghtas 1 and chose HEIGHT as its name Use the field calculator to update an existing field, select the newly created column, e.g. HEIGHT, type "ELEV" in the lower left expression window. Select OK, the old real numbers (with decimals) are now being copied to ...
If you do not care about the decimal in the elevation, try to add a new field with name 'Elevation' in QGIS for the contour line with type 'Integer', Then copy the attribute from the 'Elev' field into the 'Elevation' field, and see if that fix the problem.
Since also Kosmtik exhibits this behaviour when there have been changes to SVG or PNG files this is rather related to Mapnik than to TileMill. I'm not aware of an option to turn this off. The only solution would be to restart TileMill. Additionally, you could also try to clear the cache folder of TileMill as suggested here.
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