Adds an optional end point distance threshold parameter to the
network analysis tools. Previously (and still, by default) endpoints
will ALWAYS be snapped to the nearest point in the network layer,
regardless of how far away from the network they actually are. This
can result in meaningless results, as the tools will happily snap
points to a road hundreds of kilometers away :)
Now, there's an optional end point distance threshold parameter
for these tools. The behaviour of the threshold depends on the
algorithm:
- For the “Service area (from layer)” tool an optional new output
was added for “non routable features”. This output will contain
any features which were deemed too far from the network. All
other features which are within tolerance distance to the
network will be stored in the standard output from the tool.
- For the “Service area (from point)” tool an error will be raised
if the point is too far from the network
- For the “Shortest path (point to point)” tool an error will
be raised if either the source or destination points are too far
from the network.
- For the “Shortest path (layer to point)” and “Shortest path (point
to layer)” tools:
- An error will be raised if the **point** is too far from the network.
- A new optional output was added for “non routable features”. This
output will contain any features which were deemed too far from the
network. All other features which are within tolerance distance to
the network will be stored in the standard output from the tool.
Sponsored by City of Canning
Use the processing context's ellipsoid instead of a hardcoded
WGS84 ellipsoid for distance calculations during network
analysis, so that the lengths used will exactly match other
measurement tools used on the same features in the same
project.
Otherwise unittest thinks the function is a test itself and runs it
accordingly, and then raises a deprecation warning because
return values are not permitted from test functions
digital elevation model in order to classify pixels into ground
and non-ground cells
This is a port of the SAGA "DTM Filter (slope-based)" tool to a native
QGIS algorithm.
It also serves as a nice reference algorithm for raster based tools
which operate on a neighbourhood of pixels.
algorithm
If checked, then any disjoint parts in the buffer results will be
output as separate single-part features. This setting is designed
to expose a similar functionality as is available for the 'dissolve'
algorithm.
Sponsored by City of Canning
This provider has not been maintained and does not work with
newer SAGA versions. Users are encouraged to use the 3rd-party
"Processing Saga NextGen" plugin instead.
