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there is a contour-plugin, which you can load via plugin-manager. additional infos here: https://github.com/ccrook/QGIS-Contour-Plugin


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3D is not (yet) implemented in QGIS, but you can store the height in an attribute table field and create a 3D output manually with ogr2ogr -z_field fieldname outside QGIS. See Is it possible to create 3D dxf with OGR? for an example. This is rather 2.5D, because all vertices of a line must have the same elevation (as contours have). In QGIS, you could use ...


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You can define the labelling style using the label.style argument of lattice::contourplot. In my opinion, you should choose align. It is not a complete solution because it does not break the contour lines, but it is better than the default method. On the other hand you can overlay two different contour plots with different cuts, line widths, and labels ...


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Have you seen Spatial Analyst Supplemental tools : Here : SA Supplemental tools or a direct download page. You might also want to refer to the create Field Contours page in which you will find a comment about script modifications to allowed for customized contour intervals. One of these builds a "filled polygon contour" from a raster dem. Not exactly what ...


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Here is a vector-based suggested workflow to compute the area for each contour interval in your data set. You might want to look for some "easier" to implement solutions in other sources - here is one. As to the suggested work flow: Start with converting your contours to polygons (Feature to Polygon tool) and add a field named: "Within" of an integer ...



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