Re: [Qgis-user] International/Local Labeled World Basemap in QGIS. Protomaps?

[Greg Troxel via QGIS-User]

Richard Duivenvoorde  writes:

> On 10/24/23 13:40, Greg Troxel via QGIS-User wrote:
>> I am not sure how I feel about "range requests are the right answer" vs
>> tiles, as from a CS viewpoint it seems to be the same thing and it feels
>> a little like "you have to do it our way now", and it's not clear to me
>> that there is a layer that basically extracts tiles from the big file,
>> separating the tiles/range issue from the rest.  I hope it is that way.
>> I can see that currently people can host a big file with ranges more
>> easily than a hierarchy of files.
>
> I'm not a specialist in this, but my point in this, is that it is easy to 
> fetch this big file from the build page (or use the tools to create it 
> theirself).
>
> And as it looks like all this is very good cache-able I think it is better 
> then having a more heavy solution like mapservers or mapproxy servers?
>  I'm ok both with a Object storage solution (with range requests if
> I'm right) OR with some small proxy in front to handle xyz/pbf
> requests.

I see it as just a different file storage layout, either a bunch of
files, or one file with a built-in filesystem layer and a library that
gets the sub-files (tiles) out.  It seems pretty equivalent, and the
issue is really about which software and provider setups are easier or
cheaper to deal with.  I suspect this is really about "big provider X
will let you host a 110GB file and do range requests, but they won't let
you host a hierarchy of smaller files adding up to 110GB, at least not
for the same price".  Which is a good reason.  That's basically what
protomaps says, as I read it.

>> My impression is that there is js for browsers to obtain the bits via
>> range requests and then render.  Is there a plugin that will effectively
>> fetch the tiles from this alternate (non-TMS, non-OGC) representation?
>> And then render?  Or is your idea to obtain vector data, and have a
>> separate qgis-specific rendering pipeline?
>
> We could start (with the xyz version which is already available (after 
> getting a key):
>   https://api.protomaps.com/tiles/v2/{z}/{x}/{y}.pbf?key=

So that's exactly the per-file layout I contrasted.  Sounds like the
code can use either then, which is good.

> crux here is to get styles which work in QGIS.

Indeed, and the question is if it's rendering to raster in the plugin
using the same kind of code that would happen in a browser,
or if it's providing vector data and letting qgis use it, sort of a like
a database connection to a bunch of layers.

One of the big issues is going to be the mismatch between the layer
world, where each has a table with a schema, and the OSM tagging world.
I've dealt with that a bit using highway=path as source data for
displaying trails in a qgis map.

>> But this is vector.  Are you suggesting that this be geodetic in
>> ITF2014, instead of projected?
>
> No, just that people maybe prefer (national) vector tile sets in their own 
> local crs's.
> Maybe I'm the only one looking for World-maps :-)

I see.   Well yes, people might, and I suppose they can set it up, but
in theory using ITRF2014 or WGS84 (and ignoring the ensemble problem)
should be equivalent after transforms.   As a user in the US, all the
tiled maps I get are in 3857, even the MassGIS basemap -- even though
MassGIS is very firmly in NAD83.

>> I wonder how this compares to loading OSM in postgis and styling it.
>> It would be nice to have consistent methods so that one can mix and
>> match the various architectural (vs GIS) layers in the stack without
>> them being siloed.
>
> I've been trying that, but styling is too much work for me, the
> labeling alone (have all the proper fonts available) is already a lot
> of work.

I found it hard, too.

Well, all in all I think this is worth working on.  I just don't have a
good handle yet.
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Re: [Qgis-user] International/Local Labeled World Basemap in QGIS. Protomaps?

[Greg Troxel via QGIS-User]

Richard Duivenvoorde  writes:

>>I am unclear on how we are dealing with the required OSM attribution
>>in qgis.  I have added OSM tiles with quickosm, and the main map view
>>lacks attribution.  I did publish a pdf map of local conservation, and
>>I was careful in the map composer to attribute OSM (required) and
>>MassGIS (polite).  I suspect at least some are not so careful.
>>Leaflet has a default or at least more in-the-groove attribution path,
>>and I think adding OSM to qgis should too.   This is not specifically
>>about this vs TMS, but if starting from scratch I think we should
>>significantly try.
>
> Agreed, but I do not have a solution for that either. Not sure if QGIS
> should enforce this or it is actually the responsibility of the
> producer of a map.

It is certainly the responsibility of anyone who uses OSM data and
shares it.

There are multiple options for qgis/plugins, at least:

  1) add OSM data, don't tell the user that there is a license, and don't
  add any attribution by default

  2) when adding the data, automatically add an attribution object so
  the canvas shows it, like the editor layer index support in JOSM.  Do
  something perhaps similar in print composer.  This might be creating
  an attribution decoration in a map view.  Another example is leaflet,
  where example code tends to look like the following, which shows the
  tooling support for attribution.

 var osmUrl = 'https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png',
 osmAttrib = ' https://www.openstreetmap.org/copyright;>OpenStreetMap contributors',
 osm = L.tileLayer(osmUrl, {maxZoom: 19, attribution: osmAttrib});


  3) Like 2, but (unless you change source and rebuild), don't allow
  deleting the attribution.

As I see it, option 3 is "enforce" and agreed we don't want that.  But I
ee option 1 as deliberate indifference to OSM's license, and I could see
an argument that it's contributory infringement, although I think
legally it's a stretch.  Socially however, it's valid.  I meant option
2, to have the normal/default path be to get minimal compliant
attribution, and of course people can make the software do what they
want, even if it's something that isn't legally permitted (if
distributed).

I acknowledge that this is not a problem newly raised by protomaps.  I
have just been semi-surprised at the state of OSM/non-attribution in
plugins.



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[Qgis-user] Convert PNG file to vector file

[krishna Ayyala via QGIS-User]

Hello,
I have a png file. This has polygons with 36 categories as shown in the
legend. Is it possible to convert this file to a vector file such as .shp
or gpkg file? When I open the attribute table, it should be able to
distinguish between each of these 36 categories. Below is the weblink to
png. Can anyone help me with this please?

Regards.

ListofProjects.png (2200×1700) (oklahoma.gov)

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Re: [QGIS-it-user] wms catasto su LM

[Alessandro Correddu via QGIS-it-user]

Ciao Andrea,
si ho già letto tutti i messaggi, speravo che Ludovico potesse condividere
i passaggi che ha fatto.
Ho lizmap installato su docker su macchina linux, non riesco a trovare il
file "qgis-auth.db" né ho ben chiaro come si possa configurare qgis-server.
Lizmap funziona correttamente, unica pecca che se riavvio il docker non
mantiene il tema che ho personalizzato e devo ricaricare i file sul server,
probabilmente sto solo sbagliando cartella dove inserire la
personalizzazione.
Però il problema principale è il catasto che non riesco proprio a farlo
caricare.
Grazie mille per la risposta.
Alessandro

Buona la seconda, “oppure il processo di QGIS Server non riesce ad
>> modificare il file qgis-auth.db a causa di mancanza di permessi di
>> scrittura”
>
>
>>
>>
>> Risolto configurando meglio qgis-server e settando i giusti permessi al
>> file qgis-auth.db.
>
>
>>
>>
>> Saluti
>
>
>> Ludovico
>
>

Il giorno mar 24 ott 2023 alle ore 11:35 Andrea Giudiceandrea via
QGIS-it-user  ha scritto:

> > Alessandro Correddu alecorreddu a gmail.com
> > Dom 22 Ott 2023 01:27:44 PDT
>
> > Riprendo questa vecchia discussione perché sembrava che Ludovico avesse
> > risolto ma non ho trovato dettagli.
>
> Ciao Alessandro,
> hai già letto i messaggi precedenti relativi a questa discussione? Puoi
> trovarli nell'archivio online della mailing list
>
> https://lists.osgeo.org/pipermail/qgis-it-user/2021-November/thread.html#9620
>
> A presto.
>
> Andrea
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>
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[Qgis-user] "No transform available..." error on Fill nodata command (simplified)

[Damien McAnany via QGIS-User]

I am reposting this as all of my screenshots are edited out.

I am running QGIS 3.32.3 Lima on an M1 Chip Macbook Pro with Ventura OS
13.5.2. If any other info on my version is helpful, please ask. I had the
same problem running Firenze previously.

I think the error I am getting is a large general problem with my
installation, not with the particular "Fill nodata" command. I'm guessing
that something is not installed correctly, and would like advice on how to
fix my installation (if that is actually the issue).

I have used this command on two DEMs, so I don't think that is the issue
either.

When I run the Fill nodata command, the error says: "No transform is
available between NAD83(NSRS2007)/California zone 3 (ftUS); NAVD88 height
(ftUS) and ESRI:102242 - NAD_1983_HARN_StatePlane_California_II_FIPS_0402."
"No coordinate operations are available between these two systems."

I have tried using other fill commands like Fill sinks XXL (wang and liu)
and r.basins.fill. None of them fills the holes in the DEM.

Any help you can provide would be appreciated.

Thanks,

Damien

PS I am a new QGIS user. I am happy to learn, but my current knowledge is
limited.

*Damien McAnany Luce*

Sustainable Sites AP, ISA-Certified Arborist

dam...@permacultureartisans.com 

Tel. 707.360.5231

Fax. 707.829.0836
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Re: [Qgis-user] International/Local Labeled World Basemap in QGIS. Protomaps?

[Richard Duivenvoorde via QGIS-User]

On 10/24/23 14:38, Greg Troxel via QGIS-User wrote:

   I, and I suspect many others, often want basemaps for a much more
   limited area.  For 95% of what I do, a basemap that only covers
   Massachusetts, US, is just fine.  It would be great if I could take a
   regional extract and produce by own file that is only 200 or so MB.  I
   realize that's more of a comment about protomaps, and likely
   supported, unless there's some doctrine against it, but I wanted to
   inject the thought into qgis planning.   I think this is mostly just
   "be able to point to file or URL of your choice" and everything else
   is bug fixes. 


This is provided by Protomaps itself, so people could do that if they want.

And: no planning yet, I was just wondering wat other felt/thought.

I've been playing with it, and at this moment it lacks (in QGIS) proper style 
handling, I think.


   I am unclear on how we are dealing with the required OSM attribution
   in qgis.  I have added OSM tiles with quickosm, and the main map view
   lacks attribution.  I did publish a pdf map of local conservation, and
   I was careful in the map composer to attribute OSM (required) and
   MassGIS (polite).  I suspect at least some are not so careful.
   Leaflet has a default or at least more in-the-groove attribution path,
   and I think adding OSM to qgis should too.   This is not specifically
   about this vs TMS, but if starting from scratch I think we should
   significantly try.


Agreed, but I do not have a solution for that either. Not sure if QGIS should 
enforce this or it is actually the responsibility of the producer of a map.

Regards,

Richard



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Re: [Qgis-user] International/Local Labeled World Basemap in QGIS. Protomaps?

[Richard Duivenvoorde via QGIS-User]

On 10/24/23 13:40, Greg Troxel via QGIS-User wrote:

I am not sure how I feel about "range requests are the right answer" vs
tiles, as from a CS viewpoint it seems to be the same thing and it feels
a little like "you have to do it our way now", and it's not clear to me
that there is a layer that basically extracts tiles from the big file,
separating the tiles/range issue from the rest.  I hope it is that way.
I can see that currently people can host a big file with ranges more
easily than a hierarchy of files.


I'm not a specialist in this, but my point in this, is that it is easy to fetch 
this big file from the build page (or use the tools to create it theirself).

And as it looks like all this is very good cache-able I think it is better then 
having a more heavy solution like mapservers or mapproxy servers?
 
I'm ok both with a Object storage solution (with range requests if I'm right) OR with some small proxy in front to handle xyz/pbf requests.



My impression is that there is js for browsers to obtain the bits via
range requests and then render.  Is there a plugin that will effectively
fetch the tiles from this alternate (non-TMS, non-OGC) representation?
And then render?  Or is your idea to obtain vector data, and have a
separate qgis-specific rendering pipeline?


We could start (with the xyz version which is already available (after getting 
a key):
https://api.protomaps.com/tiles/v2/{z}/{x}/{y}.pbf?key=
crux here is to get styles which work in QGIS.

I also do like the work of Jochen Topf (see an earlier mail of me):
https://dev.jochentopf.com/osm/{z}/{x}/{y}.pbf
with style
https://dev.jochentopf.com/projects/map/colorful.json

Crux there is to setup the infrastructure (including postgis/osm) and creation 
of tiles.


Saying "host a 110 Gb" file leads to the obvious question of update
rate, but monthly updates would be decent for many uses.


Not sure, but as a basemap lacks a lot of details, once per 1,2 or 3 months 
seems reasonable to me?


But this is vector.  Are you suggesting that this be geodetic in
ITF2014, instead of projected?


No, just that people maybe prefer (national) vector tile sets in their own 
local crs's.
Maybe I'm the only one looking for World-maps :-)


I wonder how this compares to loading OSM in postgis and styling it.
It would be nice to have consistent methods so that one can mix and
match the various architectural (vs GIS) layers in the stack without
them being siloed.


I've been trying that, but styling is too much work for me, the labeling alone 
(have all the proper fonts available) is already a lot of work.

Regards,

Richard

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Re: [Qgis-user] International/Local Labeled World Basemap in QGIS. Protomaps?

[Greg Troxel via QGIS-User]

Richard Duivenvoorde via QGIS-User  writes:

> Looking at Protomaps [0], and see that it's tools are OpenSource, data
> from OSM data, and you should be able to host a 110Gb file via CDN as
> basemap.

Two more thoughts:

  I, and I suspect many others, often want basemaps for a much more
  limited area.  For 95% of what I do, a basemap that only covers
  Massachusetts, US, is just fine.  It would be great if I could take a
  regional extract and produce by own file that is only 200 or so MB.  I
  realize that's more of a comment about protomaps, and likely
  supported, unless there's some doctrine against it, but I wanted to
  inject the thought into qgis planning.   I think this is mostly just
  "be able to point to file or URL of your choice" and everything else
  is bug fixes.

  I am unclear on how we are dealing with the required OSM attribution
  in qgis.  I have added OSM tiles with quickosm, and the main map view
  lacks attribution.  I did publish a pdf map of local conservation, and
  I was careful in the map composer to attribute OSM (required) and
  MassGIS (polite).  I suspect at least some are not so careful.
  Leaflet has a default or at least more in-the-groove attribution path,
  and I think adding OSM to qgis should too.   This is not specifically
  about this vs TMS, but if starting from scratch I think we should
  significantly try.
  
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Re: [Qgis-user] International/Local Labeled World Basemap in QGIS. Protomaps?

[Greg Troxel via QGIS-User]

Richard Duivenvoorde via QGIS-User  writes:

> Looking at Protomaps [0], and see that it's tools are OpenSource, data
> from OSM data, and you should be able to host a 110Gb file via CDN as
> basemap.

I have been hearing about this and due to excitement inertia I am still
in the stage of finding it sort of interesting.

I am not sure how I feel about "range requests are the right answer" vs
tiles, as from a CS viewpoint it seems to be the same thing and it feels
a little like "you have to do it our way now", and it's not clear to me
that there is a layer that basically extracts tiles from the big file,
separating the tiles/range issue from the rest.  I hope it is that way.
I can see that currently people can host a big file with ranges more
easily than a hierarchy of files.

My impression is that there is js for browsers to obtain the bits via
range requests and then render.  Is there a plugin that will effectively
fetch the tiles from this alternate (non-TMS, non-OGC) representation?
And then render?  Or is your idea to obtain vector data, and have a
separate qgis-specific rendering pipeline?

Saying "host a 110 Gb" file leads to the obvious question of update
rate, but monthly updates would be decent for many uses.

> Would it be an idea (doable) for us as QGIS Community to host/CDN
> this, make sure we can handle a couple of styles/themes very well and
> then add it to QGIS as base map ( EPSG:3857 only sorry :-) )?
>
> OR would 'we' prefer to have vector tiles in 'proper' crs's?

Generally tiles are available in 3857, so that seems ok.

But this is vector.  Are you suggesting that this be geodetic in
ITF2014, instead of projected?

If so, are you trying to resolve:

  3857 is icky from a theoretical perspective, the earth not being
  spherical?

  you don't want projected coordinates?

  WGS84 as referenced by 3857 is an ensemble, and some members are 2m
  different, and therefore anything in 3857 is low accuracy unless you
  have a secret side agreement?

> Myself I'm looking for a proper WORLD-map with both English and Local
> labels/placenames (or easy switchable between those).
> And even downloading a 100Gb file and installing locally would be OK
> for me.
>
> Others maybe had a look or better idea's?

It seems like nice functionality to have, even if the hosting doesn't
happen.


I wonder how this compares to loading OSM in postgis and styling it.
It would be nice to have consistent methods so that one can mix and
match the various architectural (vs GIS) layers in the stack without
them being siloed.
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Re: [QGIS-it-user] wms catasto su LM

[Andrea Giudiceandrea via QGIS-it-user]

Alessandro Correddu alecorreddu a gmail.com
Dom 22 Ott 2023 01:27:44 PDT



Riprendo questa vecchia discussione perché sembrava che Ludovico avesse
risolto ma non ho trovato dettagli.


Ciao Alessandro,
hai già letto i messaggi precedenti relativi a questa discussione? Puoi 
trovarli nell'archivio online della mailing list 
https://lists.osgeo.org/pipermail/qgis-it-user/2021-November/thread.html#9620


A presto.

Andrea
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[Qgis-user] International/Local Labeled World Basemap in QGIS. Protomaps?

[Richard Duivenvoorde via QGIS-User]

Hi All,

Looking at Protomaps [0], and see that it's tools are OpenSource, data 
from OSM data, and you should be able to host a 110Gb file via CDN as 
basemap.


Would it be an idea (doable) for us as QGIS Community to host/CDN this, 
make sure we can handle a couple of styles/themes very well and then add 
it to QGIS as base map ( EPSG:3857 only sorry :-) )?


OR would 'we' prefer to have vector tiles in 'proper' crs's?

Myself I'm looking for a proper WORLD-map with both English and Local 
labels/placenames (or easy switchable between those).
And even downloading a 100Gb file and installing locally would be OK for 
me.


Others maybe had a look or better idea's?

Regards,

Richard Duivenvoorde

[0] https://github.com/protomaps
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