New answers tagged analysis
This has nothing to do with the amount of data. This is an error caused by NULL values in your data. This should be considered a bug. Please open a ticket for this.] This has been fixed in commit f9e0093. Unfortunately just a bit too late to hit QGIS 2.2.0. It would be very nice if you could test this fix (e.g. with tomorrow's master build) and give a ...
You can use Data Driven Pages to quickly loop through each feature of your feature class. Within the settings you can set up what % you want to zoom to - i.e. 100% will have the feature fill the screen, but you might want to try something like 150%. This tool, although designed to make maps, is also useful for inspecting features quickly.
This doesn't actually answer the question but it still solved my problem: What I did was "simply" to snap my points (hospitals) to the road network within PostGIS beforehand. Now that all my points lie exactly on the network, I no longer need to worry about the tolerance. This is not very elegant though, so if anyone has a "real" solution, I would still be ...
The arcpy way of doing this would be the following logic: Referencing Gerry Gabrisch Create Perpendicular Lines to Each Segment of a Shapefile and this Q/A you can create perpendiclar transects at the start and end point of each line segement. The transect feature class may then be used to split the buffered layer using the python logic that @iRfAn has ...
from GRASS GIS: v.buffer: -c Don't make caps at the ends of polylines from the interface of v.buffer.distance in QGIS (Processing Toolbox): from the interface of v.buffer.column in QGIS (Processing Toolbox): or use GRASS GIS directly and not the GRASS plugin (as says zimmi)
You could use GRASS itself because it exposes the -c option.
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