I am using QGIS 1.8.0 I would like to densify a polyline according to a particular length of segment (ex. 200 m). I know it is possible with other GIS software.
Is it possible to do this in QGIS?
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Yes it is possible. Densify is located under the vector menu.
I assume what you mean by densify is effectively a buffer, where the line thickness is proportional to a function of the line length.
This can be achieved using a small amount of scripting. I am unable to write the script at present as I have no access to QGIS, however the pseudocode will be along the lines of:
FOR each polyline: buffersize = line_length * constant BUFFER polyline by buffersize