e docs say attributeDisplayName(attributeIndex),
while they say editorWidgetV2Config(fieldIdx). What's the difference between
attributeIndex and fieldIdx?
Thanks
Tom
Tom Chadwin, UK National Parks Portal Manager
Telephone: 01434 611511 Mob: 07881 109617
Web:
www.northumberlandnationalp
miera, c3a2817
Any ideas?
Tom
> -Original Message-
> From: Matthias Kuhn [mailto:matthias.k...@gmx.ch]
> Sent: 23 June 2014 13:55
> To: Tom Chadwin; qgis-developer@lists.osgeo.org
> Subject: Re: [Qgis-developer] Field visibility in Python
>
> Hi Tom,
>
> The fo
> Sent: 23 June 2014 14:46
> To: Tom Chadwin; qgis-developer@lists.osgeo.org
> Subject: Re: [Qgis-developer] Field visibility in Python
>
> Hi Tom,
>
> That works starting from 2.3 (master) / 2.4 (release/stable)
>
> For 2.2 you will have to work with
>
> i.editType
I need to reproject rasters and change their file type in a QGIS plugin. Can I
do this using the QGIS API? If not, I can do this externally with
gdal_translate, but how can I determine the path to gdal_translate in Python?
Thanks
Tom
Tom Chadwin, UK National Parks Portal Manager
Telephone
on of the OpenLayers plugin suitable for working with it in
plugin development? An API?
Tom Chadwin, UK National Parks Portal Manager
Telephone: 01434 611511 Mob: 07881 109617
Web:
www.northumberlandnationalpark.org.uk<http://www.northumberlandnationalpark.org.uk/>
IMPORTANT NOTICE - Disclaim
Hello
Is there either a QT/native PyQgis method for saving the settings of a plugin
dialog so that they persist between application restarts? Or is there a
recommended/established best practice way of doing so?
Thanks
Tom
Tom Chadwin, UK National Parks Portal Manager
Telephone: 01434 611511
().destinationCrs()
Is that correct? If so (as a QGIS plugin and Python beginner) what is the best
way to handle the deprecation and maintain backwards compatibility, given that
QgsMapCanvas.mapRenderer() is only in 2.4+?
Thanks
Tom
Tom Chadwin, UK National Parks Portal Manager
Telephone: 01434 611511
m in javascript which Leaflet can understand.
Thanks
Tom
Tom Chadwin, UK National Parks Portal Manager
Telephone: 01434 611511 Mob: 07881 109617
Web:
www.northumberlandnationalpark.org.uk<http://www.northumberlandnationalpark.org.uk/>
IMPORTANT NOTICE - Disclaimer - This communication i
Found it:
layer.rendererV2().classAttribute()
Thanks
Tom
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Hello
In 2.4, when writing geoJSON, QgsVectorFileWriter.writeAsVectorFormat() created
Point features. In 2.6, this seems to have changed to Multipoint. Is this
intentional? If so, why?
Thanks
Tom
Tom Chadwin, UK National Parks Portal Manager
Telephone: 01434 611511 Mob: 07881 109617
Web
Hello all
I'm trying to build labelling into qgis2leaf. How do I retrieve the name of
the field used as a layer's label? I've tried QgsLabel::labelField ( int
attr ), but I don't understand what the argument attr is.
Thanks
Tom
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Can anyone help with this?
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> QgsLabel(layer.pendingFields()).fields()[0].name()
That doesn't work - it gives the field at position 0, not the labelling
field.
> layer.customProperty("labeling/fieldName")
But this does work perfectly. Thank you so much.
Tom
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Noted. Thanks, Nathan.
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Thanks, Riccardo, for bringing this discussion to my attention. I think we
need to proceed with caution, considering the following issues:
1. Bigger is not always better - specialized tools often yield better
results than big ones with every option under the sun bloating the code and
confusing the
The official source for Ordnance Survey SLDs is here:
http://www.ordnancesurvey.co.uk/business-and-government/help-and-support/products/styled-layer-descriptors.html
Their licence
(http://www.ordnancesurvey.co.uk/docs/licences/stylesheet-licence-v2.pdf)
contains the following:
"You may only lice
How do I save a layer as a rendered image? qgis2leaf exports rasters, but
they are unrendered, and hence sometimes do not display correctly, if at
all. How do I "Save raster layer as..." "Rendered image" via Python?
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I'm implementing rule-based rendering in qgis2leaf. I know I can get the
filterExpressions with:
qgis.utils.iface.mapCanvas().layers().rendererV2().rootRule().children().filterExpression()
However, filterExpressions are in "SQL-like" syntax. I need to transform
these into JavaScript:
QGIS: "nam
Hi Nathan
> Don't use regex. You are in for a world of pain if you go that way, and
> not the kind of pain you feel good about after.
Akin to:
http://stackoverflow.com/questions/1732348/regex-match-open-tags-except-xhtml-self-contained-tags
Many thanks for looking into it – very much appreciat
ed it, and uploaded a new version.
I deleted the version with the major bug. Is that correct? Or should I leave
all versions up there even if faulty? All versions are on GitHub.
Thanks
Tom
Tom Chadwin, ICT Manager
Telephone: 01434 611530 Mob:
Web:
www.northumberlandnationalpark.org.uk
Many thanks - I'll get rid of everything but the latest experimental.
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nfo.
What do I do next?
Thanks
Tom
Tom Chadwin, ICT Manager
Telephone: 01434 611530 Mob:
Web:
www.northumberlandnationalpark.org.uk<http://www.northumberlandnationalpark.org.uk/>
IMPORTANT NOTICE - Disclaimer - This communication is from Northumberland
National Park Authority (NNPA)
Has anyone set up TravisCI to test commits in a QGIS Python plugin Github
repo? Can anyone give me some help?
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Thanks very much, Martin. Looks like I have a lot to learn (unittest/nose, as
well as Travis itself).
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OK, so I have found the documentation which says I should use QSettings(),
which is clear enough, and I can read settings in fine. However, if I want
my plugin settings to persist transparently (ie the user should not have to
save the settings explicitly), where in the plugin should I put all my
QS
ettings at some other point. Any
ideas?
Original message
From: "Richard Duivenvoorde [via OSGeo.org]"
Date: 05/06/2015 16:08 (GMT+00:00)
To: Tom Chadwin
Subject: Re: Persist plugin GUI dialog settings
On 05-06-15 16:34, Tom Chadwin wrote:
> OK, so I have found th
In Python, is it possible to retrieve the value for an HTML map tip:
Layer Properties > Display > Map tip display text > HTML
I've been rooting around in the API, but haven't managed to find it.
Thanks
Tom
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I've ended up connecting the QSettings() function to the parent QTreeWidget's
itemChanged signal. This works for text and checkboxes, but does not seem to
emit for changing the selected item in a combobox. Does anyone know what
signal is emitted under these circumstances?
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I need to get the "Fill style" of a simple fill symbol layer, but cannot find
that in the API docs. Does it exist? I need it to fix a reported bug in
qgis2web:
https://github.com/tomchadwin/qgis2web/issues/10
Specifically, I need to determine if a simple fill symbol layer has fill
style "No Brush
Ah: brushStyle(). Got it. Thanks.
Tom
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qgis2web saves its settings via QSettings(). However, it currently simply
saves a load of ungrouped individual settings, which doesn't seem sensible
(and potentially could overwrite non-qgis2web settings). Is there a
preferred QSettings() group convention for plugins, or should I just use
"qgis2web
Perfect - I've implemented it as described. Thanks for the help, Richard.
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Surely if a layer is unchecked in the legend, none of its features should
show, regardless of symbology or renderer.
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Sent from
I've got a bit further with this, but have an embarrassingly basic question.
I'm using Tim's Plugin Builder's run-env-linux.sh, but the default QGIS path
doesn't seem to match where Travis installs QGIS to - is Travis running
Ubuntu? Can anyone tell me what QGIS path I should pass to run-env-linux.
aille [via OSGeo.org]"
Date: 22/06/2015 19:37 (GMT+00:00)
To: Tom Chadwin
Subject: Re: Using TravisCI integration in Github for QGIS Python plugin
Have a look to the Travis config file in inasafe :
https://github.com/AIFDR/inasafe/blob/develop/.travis.yml
2015-06-22 20:19 GMT+02:00 Tom Chadwin
I've got the build environment up now, I think - many thanks, all. However,
does anyone know how I can get rid of the following test fail:
QPixmap: Must construct a QApplication before a QPaintDevice
I don't see QApplication instantiated anywhere. I'm not sure how to get past
this, since the fail
So Google has told me repeatedly. My issues are:
- I have not previously done this because the plugin works fine in QGIS, and
this issue has only shown up in tests
- I don't know how (or where) to instantiate QApplication (or
QgsApplication?)
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I already had a similar get_qgis_app() function, but I was only using it to
instantiate QgsApplication in tests which I thought had QIcon or QPixmap
functionality. Adding it to all other tests has solved the problem. Thanks
so much for your patience.
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I suspect I'm not going to get this to work. I hit the problem that my plugin
's code used iface, which was not recognised. I managed to inject the dummy
iface replacement created in the qgis_get_app () function mentioned above.
However, next the code calls:
```python
IFACE.legendInterface().group
Any instance of qgis_get_app() outside of /test is only my attempts to get
his testing working, so I'll dig out the commit which put it there and
revert it. I'll have a look at your guidance on implementing iface, but if
you are able and interested to have a look as well, then of course I'd be
extr
I'm sure someone has this in mind, but the countdowns on the QGIS home page
to next feature freeze and release are both on 0 since we passed the release
date.
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Sent from the Quan
This post is in no way a criticism of any of the QGIS team and their
monumental efforts or their fabulous product. However, I thought someone
should question how successful the four-monthly release schedule is. 2.8
immediately needed 2.8.1, and there seems to be the chance that 2.10 is
immediately
My point, if my understanding and memory of the last few months is correct,
is that these two .1 releases have been required (2.8.1) or identified as
required (2.10.1), before each .0 version has been fully released. My
argument is that that is not the same as the normal caution about .0
versions,
If the answer is that there is no way that the 2.8.0 and 2.10.0 bugs would
ever have come to light before release, then sure, I accept the argument.
However, Nyall says that one of the bugs was apparent as a test failure.
Perhaps the best thing to do would have been to acknowledge that the flood
of
If it were my budget, then yes, I would consider it, so long as enough others
did so as well, to get the hours required for it to have an effect. That
figure is roughly the support for 1 year's support for a proprietary GIS for
a single user (very roughly, from memory), so I would hope that many
or
> That is exactly why we have introduced long-term releases (LTR) for
QGIS - for organizations that just need a stable QGIS for their work
But the only .0 LTR so far (2.8) was not stable.
> without having to worry about instabilities, testing and reporting bugs
I understand that. I was simply r
I do accept all your points. I am also probably confusing LTR with stable.
Just because a .0 is LTR should not define it as more stable than a non-LTR
.0.
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Sent from
After lots of help and contributions from Akbar, I think this is now working.
If anyone else would find the information useful, see:
https://github.com/tomchadwin/qgis2web/issues/72
and
https://github.com/tomchadwin/qgis2web/tree/LayerTree-API
Many thanks, Akbar and everyone who has helped out
To implement scale-dependent visibility in qgis2web's OL3 output, I need to
convert QGIS's layer.minimumScale() to ol.layer.Vector's minResolution. How?
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>From OL2'S scaleToResolution():
resolution = 1 / ((1 / scale) * (inches / map unit) * dpi)
ie
resolution = 1 / ((1 / scale) * (100 / 2.54) * 90.7)
Is that right (for map unit = metre, and dpi = 90.7 [1])?
Will this be correct only if the OL3 map's projection is in metres? Will I
have to cha
Sorry: inches PER map unit, or map unit / inch.
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When iterating through layers, how can I include vectors layers, exclude
layers without geometry, and include rasters? At the moment, I have:
try:
if layer.type() == 0:
testDump = layer.rendererV2().dump()
code goes here
except:
pass
This seems very ugly to me...
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I've implemented very basic Travis testing for the plugin qgis2web, and it's
been working very well, catching code errors which result in Python errors.
However, I'm now trying to expand the suite of tests to test the plugin
against different data. The problem I have is that I now cannot get Travis
Hi Matthias
This is the very early stages of implementing unittest. In time, I will test
for expected results using assert methods. At the moment, though, all I want
this to achieve is to catch Python errors, to prevent my making releases
which crash. This is what I was doing before, and it worked
Hi Matthias
Firstly, I'm not aware of a current segfault in the tests, so I'll keep an
eye out for that.
Yes, I am talking about exceptions thrown by Python. The deliberate error I
have introduced is in the main function called when a map is exported in
Leaflet format (ie not in Openlayers3). Thi
> You click on G ==> it becomes partially checked, and you restore
StatePartial
(ie A is unchecked and B is checked)
[and earlier posts]
I don't think I agree with this. I'll try to express how I would expect it
to work:
- the check state of a group is determined entirely by the check state of
I retract my comments completely until I get a chance to think it all through
again...
Tom
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QGIS 2.18, qgis2web leafletRefactor branch
(https://github.com/tomchadwin/qgis2web/tree/leafletRefactor).
- open a point layer
- change marker type to SVG
- start qgis2web
- OpenLayers 3 preview works
- click Leaflet in plugin dialog
- RTTI error
The error is triggered by:
sl = symbol.symbolLa
Many thanks. I'd still like to know why the method consistently fails in one
instance, and always works in the other, though.
What's the timescale for 2.14.9?
Thanks again
Tom
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> different imports
Could be. I'll try to check.
> different origin of the symbol
objects
Data in QGIS exactly the same, so I don't think so.
> different symbols in use...
Definitely not, for the same reason.
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Assuming only QGIS imports are relevant, the working code imports iface,
while the non-working doesn't. However, importing it doesn't stop the error.
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I'm afraid the Windows LTR nightly, with that commit, minidumps on that line
now. Removing the line stops the dump.
However, I've delved into this a lot further this morning, and I think it's
a mistake I made some months ago. The dump no longer happens if I
startRender() before it and stopRender()
If Alexandre is right, I'd love to help as well, if I can.
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I think qgis-dev is now a zombie, as it's v2 master, where there has nor been
any work for a while.
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+1
In fact, if accepted, why call them plugins?
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Sent from the Quantum GIS - Deve
Define "fail", I guess. Most plugins won't work without modification
[citation needed], but it would be good to know *how* it fails, as you are
right that there could be a more general issue.
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Amy other plugins - currently core or not - which should also be migrated to
core and stop being plugins at all? Or just Processing and DB Manager? I
can't think of any.
Tom
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Giovanni Manghi wrote
> I think that lately the very bad thing is that regression in between
> point releases of LTR started to surface.
> I strongly suggest that the paid bug fixing effort should be targeted
> to 1) regressions 2) issues that we know cause crash or data
> corruption in a replicabl
Hello all
qgis2web writes or a load of Javascript, a lot of it third-party libraries -
see the very end of the README
(https://github.com/tomchadwin/qgis2web/blob/master/README.md#credits).
I was hoping to find some way of managing these libraries - at the least
keeping track of new versions as t
Matthias Kuhn-2 wrote
> - Move dependencies into separate packages. We have some deps like
>qspatialite that are built as part of QGIS which I think could be
>installed as dependencies from a .deb. This will require quite a bit
>of work: moving travis out of the container based infrast
Hello all
Amazing work going on for QGIS3 - I'm in awe of you all (as always).
I've been getting more and more nervous about how easy it will be to convert
my plugin, so yesterday I started to have a go. With lots of help from
Matthias (huge thanks, as ever!), I got a good way through the process
Nyall Dawson wrote
> I'd say just before/after feature freeze.
Sounds sensible. Any ideas on how long between beginning of feature freeze
and release? Could be *a lot* of plugin devs pleading for help from QGIS
devs.
Thanks again
Tom
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Do you have different Saga/GDAL versions?
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Marco Bernasocchi wrote
> I've already updated a rather large plugin some months ago. and created
> a compatibilty layer plugin. have a look here
Yes, Matthias pointed me towards it. I intend to use this so that I don't
have to maintain parallel QGIS and 3 versions. Thanks!
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I'll try to write something up. No blog these days, but will put it
somewhere and see if I can RSS it and get Planet to pick it up.
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@Andreas I just want to have a 3-compatible version launched as soon as
possible. I don't really want 3 to be released and have no version to
accompany it. Yes, I could guarantee everything would work if I develop
after release, but hopefully the feature freeze will give me and others time
to conve
Richard Duivenvoorde wrote
> Should we do a wiki page on github?
>
> https://github.com/qgis/QGIS/wiki
By all means. All I would say is that anything I might write would be more
conversational and less formal, not least because I would intend to mention
things which real developers would take for
Hi Bo
Try:
QgsProject.instance().readBoolEntry("ScaleBar", "/Enabled", False)[0]
or something close to that.
Thanks
Tom
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Hello all
I've been meaning to add a donate button to my QGIS plugin's Github repo
README. For anyone who might want to do the same thing, and who likes the
common shields.io style of badges, just add the following:
[](http
There is an established generic menu order in Windows:
File
Edit
View
Help
We shouldn't unthinkingly deviate from this unless we are confident the
change represents a UX improvement. I would recommend not pushing Edit
further to the right. I believe similar conventions exist on other OSes.
Tom
ginetto wrote
> I would suggest to use the same vertical "..." menu used in Chrome,
> Firefox, OpenLayers etc etc as in the attached image.
Many investigations have shown *decreased* usability when menu items are
"hidden" in a hamburger menu. First example from a simple Google search:
https://www
Brilliant result - thanks to both Matthias and the Travis team.
Tom
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Hello all
I currently create a memory layer from an existing layer as follows
('usedFields' is a subset of the original layer's attributes/fields):
newlayer = QgsVectorLayer(uri, layer.name(), 'memory')
writer = newlayer.dataProvider()
outFeat = QgsFeature()
for feature in layer.getFeatures():
I've found this method:
viewportPolygon =
QgsGeometry().fromWkt(iface.mapCanvas().extent().asWktPolygon())
layer = iface.activeLayer()
resultlayer = QgsVectorLayer("Polygon", "result", "memory")
resultlayer.dataProvider().addAttributes(list(layer.dataProvider().fields()))
clippedFeatures = []
fo
This looks ideal. Thanks, both. Plus I could make ExactIntersect an option in
the GUI, as sometimes dotted could be more critical than accuracy.
Thanks again
Tom
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Many thanks, Matthias and Martin - I got it working exactly as you suggested.
Is this the mechanism which QGIS itself uses to determine which features are
in the viewport?
I'm running into some performance issue which I thought this would help, but
they are not solved yet, so I might soon have a m
I get:
No module named Qwt5.Qwt
I'm on 2.18.2/Win7x64
Tom
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I am assuming the answer is no, but is it possible automatically to reverse
engineer a .ui from a .py file which was originally created using pyuic4?
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> you can disable in QGIS the server-side simplification of that layer to
only enable the local simplification
The huge benefit of the feature implementing server-side simplification is
the reduction in data downloaded. Yes, we can do as you say, but we'll lose
that benefit.
It will be interestin
I tried to do this myself, but couldn't find my way round the repo code (not
a Django person). +1 for this, together with a link to the repo.
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I am trying to retrieve the WMS version of a layer, and am just parsing its
metadata(), as no other solution was suggested here:
http://gis.stackexchange.com/questions/213817/get-wms-version-from-qgis-layer-in-python
However, what does metadata() return if the user's locale is not English? In
oth
So is there a solution? Is there a way to retrieve the WMS version of a layer
which will work in all locales?
Thanks
Tom
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I think that's exactly what metadata() does. Perhaps I need to issue a new
getCapabilities request to the server, but fake/force an English locale? I
don't know how..
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Really great news. Thanks so much, Juergen!
Tom
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Sent from the QGIS - Developer mailing list a
Definitely "stroke", both because it is the standard term in graphics
software, and also because neither "border" nor "outline" make any sense in
a line.
I agree that a dark grey would be a better choice of default stroke than
black:
https://www.google.co.uk/webhp?sourceid=chrome-instant&ion=1&es
I don't know what others think, but I think incorporating the new XYZ tile
layers support in the GUI by using WMS as a "parent" layer type is
incorrect:
1. they are a different kind of layer (and I presume not an OGC standard)
2. it hides the support for XYZ layers in QGIS from the user
What do o
Hello all
Soory for another "how do I get this via the API" question. How do I get an
XYZ layer's transparency in Python ("Global transparency" in layer
properties/style pane)? How about for WMS and local raster layers?
Thanks
Tom
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Got it - it's the renderer, not the layer itself:
QgsRasterLayer.renderer().opacity()
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I've not tried it myself, but there are some instructions here:
https://github.com/inasafe/inasafe/wiki/Development-under-Windows
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Hello all
Some Mac (I think) users of qgis2web are experiencing problems with raster
exports:
https://github.com/tomchadwin/qgis2web/issues/148#issuecomment-250157682
http://gis.stackexchange.com/questions/227049/cannot-export-raster-with-qgis2web-or-qgis2leaf
The raster export code tries a num
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