0.6.1
- 'Basin statistics' reported mean slope over the whole bounding box,
with
the ground outside the basin filled in as a flat plain. On a catchment
filling 43 percent of its box that read 7 degrees where the basin's
own
slopes average 16. It now measures inside the basin only.
- A failed delineation now says why, instead of reporting an
AttributeError about a missing helper.
- The check against the river network measures distance on the ground,
so
it no longer misses rivers inside its search radius at high latitude.
- Needs basinkit 0.6.1, which also requires geopandas 1.0: on installs
with
an older geopandas the first delineation used to fail.
0.6.0
- Four new Processing algorithms. 'Terrain surfaces' computes slope,
aspect, hillshade, curvature, topographic position, ruggedness, local
relief, slope-position classes, flow accumulation, the channel
network,
the wetness index and height above nearest drainage, all from one
elevation download rather than one per surface. 'Sub-catchments and
their
routing' returns the pieces a basin is assembled from, each carrying
NEXT_DOWN, which is the routing graph a distributed model needs
without
inferring anything from geometry. 'Elevation data suitability' grades
whether the elevation model can carry the terrain analysis at all.
'Basin report' writes eight A4 pages ready for a thesis or a
manuscript.
- The elevation data suitability grade is the one worth reading first.
Five measurements against stated thresholds -- how much surface
depression filling invented, how many slopes fall below the angle at
which a gradient is only the model's own error, relief against that
error, the largest level surface, and cells with no elevation --
combined
into HIGH, MODERATE or LIMITED with a per-cell map of which ground the
answer rests on. Tested on 133 gauges against an independently
produced
elevation model: where it says HIGH the two models agree about the
slope
field at r = 0.94, where it says LIMITED at r = 0.76.
- A twelve-metre delineation backend. 'tdx' walks a reach-level graph
built
from TanDEM-X, one catchment per stream reach instead of one per 130
square kilometre unit. On 360 gauges between 100 and 500 square
kilometres it cut the median area error from 32.5 percent to 10.5
percent
and was the better answer on two thirds of them. It is never chosen
automatically because TDX-Hydro is CC BY-SA, and ShareAlike travels
into
anything derived from it and redistributed.
- Cell size is taken per row from that row's latitude everywhere in
the
terrain code. Dividing by one assumed width reports a basin at 60
degrees
north as about twice as steep as it is.

0.5.0
- Compatibility across the full supported QGIS range. The provider now
resolves the Processing source-type enum by asking the API for it, so
it
loads identically on QGIS 3.28 through 4.x. QGIS 3.34, the current
long-term release, is covered by a continuous integration job that
installs QGIS and loads every algorithm.
- Accuracy is now reported by catchment size, from blind validation
against
2,550 gauges in 99 countries whose catchment areas are published by
the
agencies that operate them: 0.3 percent median error above
100,000 square kilometres, 1.3 percent from 10,000 to 100,000, 1.7
percent from 2,000 to 10,000. Below about 2,000 square kilometres the
'dem' backend is the better instrument, and the plugin now says so at
the
moment it matters.
- Every answer is checked against the river network. When the basin
exceeds
twice the area draining to the largest river within two kilometres of
the
outlet, the plugin reports it: 85 percent of the outlets it flags need
attention, and it stays quiet on 97 percent of the ones that do not.
Precision runs from 75 percent in Europe to 93 percent in Africa.
- The 'auto' backend refines on the elevation model when the river
network
and a 30 metre routing of the same point agree on a smaller catchment.
Across 300 gauges drawn after the method was fixed and used nowhere
else
in its design, it improved 19 results, left 279 unchanged and reduced
none. Where it acts, the median error falls from 1,731 percent to 4.3
percent, at a median cost of 1.6 seconds.
- Refinement acts only when the river it is judging by lies within a
kilometre of the outlet. Beyond that distance the point is not on that
river, so the two sources stop being independent. Every refinement
that
improved a result had its river within 0.91 kilometres.
- The plugin now names what kind of place the outlet is in. An
endorheic
system, a coastal strip draining straight to the ocean, and an outlet
with nothing draining into it are each reported, the last being what a
lake surface and a sub-grid headwater have in common.
- Messages are matched to the cause and say what to do next: a
coordinate
outside the network's coverage, one beyond the snap distance, and one
on
a hillslope rather than in a channel each get their own guidance.
- The consistency line now compares the result against the river
network
rather than against the source dataset's own upstream-area field,
which
confirms the traversal rather than the choice of outlet.
- The river-network check is a checkbox, on by default, and is the
only
thing that downloads the regional rivers file.
- Against pysheds and WhiteboxTools on identical 30 metre rasters
across 59
catchments under 2,000 square kilometres, the 'dem' backend returned a
basin for every one, matched the agency figure within 20 percent on 68
percent of them against 56 and 51, and had the lowest median error.
- Requires basinkit 0.5 or newer.

0.4.0
- New algorithm: Basin morphometry. The full Horton-Strahler-Schumm
set
from one run, with the per-order table showing Strahler streams and
dataset reaches side by side, and the counts tested against what
Strahler
ordering allows. A bifurcation ratio below 2 and more than one stream
of
the basin's highest order are both impossible, and are now reported
instead of being handed back as numbers to interpret. Until now
morphometry was in the Python package but not reachable from QGIS.
- The plugin description leads with the data package rather than with
"delineate". QGIS already has
several delineation plugins, and the old wording put this one in that
queue while morphometry, which is the part with no equivalent
elsewhere,
went unmentioned.
- Requires basinkit 0.4 or newer.

0.3.3
- Pairs with basinkit 0.3.3, which corrects channel_gradient_m_per_km.
Up to
0.3.0 it divided total basin relief by main channel length, which
reports
a fall the river never makes, because the highest point in a basin is
a
ridge top and not the head of the main stem. It is now read from the
bed:
the DEM is sampled along the main channel and the drop between its
ends is
divided by the channel length. On the Koshi that is 9.6 m/km, not
15.1.
The Basin statistics algorithm never reported this figure, so nothing
in
the plugin's own output changes; it matters if you called
morphometry()
from the Python Console or a script, where the old value should be
recomputed.
- Basin.morphometry() now checks its own stream counts. Two of the
checks
are impossibilities rather than oddities: an order-u+1 stream is
formed
where two order-u streams meet, so N(u) >= 2*N(u+1) and the
bifurcation
ratio can never fall below 2, and a basin with one outlet has exactly
one
stream of its highest order. Counts that break either are reported
rather
than returned as numbers.
- The plugin description now says plainly what this does that a
delineate-from-a-click plugin offers, rather than leaving a reader to
work it out.

0.3.2
- Declares its pip dependency in the external_deps metadata field, so
it
shows in the External dependencies box on the plugin page.

0.3.1
- Fixed 16 Qt6 compatibility issues found by the plugin repository's
own
checker: every Qt and QGIS enum is now spelled with its full scope
(QgsWkbTypes.Type.Polygon rather than QgsWkbTypes.Polygon, and so on).
The scoped spelling works on both PyQt5 and PyQt6, so QGIS 3.28
onwards
and QGIS 4 are both covered by one code path, with no version guard.
- A test now scans the plugin for unscoped enums, so they cannot come
back.

0.3.0
The plugin version now tracks the basinkit package version, so it is
clear
which plugin goes with which package. No algorithm has changed since
0.1.0.
- Fixed: on macOS the "package missing" notice printed the QGIS
application
binary instead of an interpreter, so the suggested pip command opened
a
second QGIS window and installed nothing. A path is now offered only
once
it is verified to be a python executable, and there is a Python
Console
snippet that needs no path at all
- New icon: the b is drawn as a river basin with a dendritic stream
network
draining to a single outlet
- Pairs with basinkit 0.3.0, which adds Basin.morphometry() -- the
classical
Horton-Strahler-Schumm parameters -- to the Python API
0.1.0
First release.
- Delineate a basin from a canvas click, globally, via HydroBASINS
graph traversal or DEM flow routing
- Fetch DEM, land cover, soil, surface water, rivers and lakes clipped
to the basin
- Basin statistics: area, relief, mean slope, land cover fractions,
bounding-box efficiency
- Every algorithm runs in the Processing framework, so batch mode and
the Model Builder work

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