[Qgis-user] Qgis-user Digest, Vol 180, Issue 52
Rodrigo Oliveira
rodrigooliveira at sapo.pt
Sun Feb 21 11:30:08 PST 2021
EXMO. (A) SR.(A)
aceito
COM OS MELHORES CUMPRIMENTOS
RODRIGO OLIVEIRA
----- Mensagem de qgis-user-request at lists.osgeo.org ---------
Data: Sat, 20 Feb 2021 12:00:02 -0800
De: qgis-user-request at lists.osgeo.org
Assunto: Qgis-user Digest, Vol 180, Issue 52
Para: qgis-user at lists.osgeo.org
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> Today's Topics:
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>
>
> 1. Re: Problem to open Raster files (Bernd Vogelgesang)
>
> 2. Re: Symbol lines every km, moving when changing scale or
>
> moving map (Nyall Dawson)
>
> 3. Re: Problem to open Raster files (Nyall Dawson)
>
> 4. raster with distance values from a point (Fabio Falchi)
>
>
>
>
>
> ----------------------------------------------------------------------
>
>
>
> Message: 1
>
> Date: Fri, 19 Feb 2021 21:42:38 +0100
>
> From: Bernd Vogelgesang <bernd.vogelgesang at gmx.de>
>
> To: Cassia Pahim <cpahim at gmail.com>, qgis-user
>
> <qgis-user at lists.osgeo.org>
>
> Subject: Re: [Qgis-user] Problem to open Raster files
>
> Message-ID: <1b52c0b6-2746-973d-9847-d09aaadc3b90 at gmx.de>
>
> Content-Type: text/plain; charset=utf-8; format=flowed
>
>
>
> seems this a ESRI File Geodatabase (sorry, left the ESRI stage 10 years
>
> ago, so not sure).
>
>
>
> As far as I know, rasters can't be exctracted from this with QGIS.
>
>
>
> List of supported raster formats: https://gdal.org/drivers/raster/index.html
>
>
>
>
>
> Am 19.02.21 um 21:00 schrieb Cassia Pahim:
>
>> They are in those formats
>>
>>
>>
>> .gdbindexes
>>
>> . gdbtable
>>
>> . horizon
>>
>> . gdbtablx
>>
>> . freelist
>>
>> . atx
>>
>> . spx
>>
>>
>>
>> Cassia
>>
>>> Le 19 f?vr. 2021 ? 14:58, Bernd Vogelgesang
>>> <bernd.vogelgesang at gmx.de> a ?crit :
>>>
>>>
>>>
>>> could you possibly share a little more details about what type of
>>> rasters you are dealing with? There is a bazillion of different
>>> raster formats!
>>>
>>>
>>>
>>> Am 19.02.21 um 20:47 schrieb Cassia Pahim:
>>>
>>>> Hello,
>>>>
>>>>
>>>>
>>>> I am trying to create a map and I have 15 datasets that were
>>>> sent to me in a zip folder and I can?t open them into QGIS. When
>>>> using the icon ? add rater layer ? I get an error message telling
>>>> me the files are not valid or recognized. What should I do to be
>>>> able to work with those datasets ? Please note that I am using
>>>> macOS Catalina 10.15.7 and I have installed QGIS 3.16.
>>>>
>>>>
>>>>
>>>> I appreciate your help,
>>>>
>>>>
>>>>
>>>> Cassia
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>> _______________________________________________
>>>>
>>>> Qgis-user mailing list
>>>>
>>>> Qgis-user at lists.osgeo.org <mailto:Qgis-user at lists.osgeo.org>
>>>>
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>>>> <https://lists.osgeo.org/mailman/listinfo/qgis-user>
>
> ------------------------------
>
>
>
> Message: 2
>
> Date: Sat, 20 Feb 2021 07:25:03 +1000
>
> From: Nyall Dawson <nyall.dawson at gmail.com>
>
> To: Andreas Neumann <a.neumann at carto.net>
>
> Cc: Prud'homme J?r?mie <p.jeremie at gmail.com>, qgis-user
>
> <qgis-user at lists.osgeo.org>
>
> Subject: Re: [Qgis-user] Symbol lines every km, moving when changing
>
> scale or moving map
>
> Message-ID:
>
> <CAB28AsioJzeQRb9qb_g7rK1YR5aC4BbGTt156dcjtJTnYen1cQ at mail.gmail.com>
>
> Content-Type: text/plain; charset="UTF-8"
>
>
>
> On Fri, 19 Feb 2021 at 23:00, Andreas Neumann <a.neumann at carto.net> wrote:
>
>> Hi J?r?mie,
>>
>>
>>
>> Ah good to hear!
>>
>>
>>
>> I'm not a big fan of this fact that line simplification is turned
>> on by default in QGIS. I believe that users should consciously turn
>> it on if they want it!
>
> I'd be interested to see some benchmarks of disabling vs enabling
>
> simplification for the marker line symbol layer alone. If it's not too
>
> expensive, we could skip it automatically for line marker symbol
>
> layers (it makes a HUGE difference to the rendering speed for simple
>
> line layers and other symbol layer types, but the intention is that
>
> the results should be visually identical to no simplification).
>
>
>
> Nyall
>
>> Your example shows that it can lead to confusion (understandably).
>>
>>
>>
>> Good that it works now. Note that you can override this setting on
>> a per layer base in the layer properties - so not all layers need
>> to have the same setting.
>>
>>
>>
>> Greetings,
>>
>>
>>
>> Andreas
>>
>>
>>
>> On 2021-02-19 13:40, Prud'homme J?r?mie wrote:
>>
>>
>>
>> Hi,
>>
>>
>>
>> I had simplification turned on, indeed...
>>
>>
>>
>> I deactivated it :
>>
>> - in the Options as you mention, so that it is deactivated for
>> newly added layers
>>
>> - in my layer options (Rendering properties)
>>
>>
>>
>> And it is ok now.
>>
>>
>>
>> It makes sense that if the line is simplified the distance vary !
>>
>>
>>
>> Thanks Andreas.
>>
>>
>>
>>
>>
>> J?r?mie.
>>
>>
>>
>> Le ven. 19 f?vr. 2021 ? 11:12, Andreas Neumann
>> <a.neumann at carto.net> a ?crit :
>>
>>
>>
>> Hi J?r?mie,
>>
>>
>>
>> Do you have geometry simplification turned off? See "Settings" -->
>> "Options" --> "Rendering" --> "Enable feature simplification ..."
>>
>>
>>
>> Make sure this is deactivated (I think it is enabled by default).
>>
>>
>>
>> Greetings,
>>
>>
>>
>> Andreas
>>
>>
>>
>>
>>
>> On 2021-02-19 11:05, Prud'homme J?r?mie wrote:
>>
>>
>>
>> Tested too fast :(
>>
>>
>>
>> Behavior is ok when zooming in, but still problems when zooming
>> out (whereas the entire feature is visible !).
>>
>> See here : https://www.zupimages.net/viewer.php?id=21/07/ehlo.gif
>>
>>
>>
>> Circles should follow the strokes generated with the tool "Points
>> along geometry".
>>
>>
>>
>>
>>
>> J?r?mie.
>>
>>
>>
>> Le ven. 19 f?vr. 2021 ? 10:03, Prud'homme J?r?mie
>> <p.jeremie at gmail.com> a ?crit :
>>
>>
>>
>> Hi,
>>
>>
>>
>> Thank you very much Nyall, this one was pretty well hidden.
>>
>>
>>
>> With clipping unchecked, behavior is as expected for my use case.
>>
>>
>>
>>
>>
>> J?r?mie.
>>
>>
>>
>> Le jeu. 18 f?vr. 2021 ? 23:29, Nyall Dawson
>> <nyall.dawson at gmail.com> a ?crit :
>>
>>
>>
>> On Wed, 13 Jan 2021 at 06:33, Prud'homme J?r?mie
>> <p.jeremie at gmail.com> wrote:
>>
>>
>>
>> Hi,
>>
>>
>>
>> I'm using QGIS 3.10.
>>
>>
>>
>> I tried to use only symbology to display a stroke every km along a road.
>>
>> The project CRS is 2154 (Lambert 93).
>>
>>
>>
>> When adding a ""symbol line" with an interval of 1000 map units
>> (meter for 2154) ? or 1000 meters at scale, same result ? I achieve
>> to display symbols every km.
>>
>>
>>
>> Problem is when I move the map or change scale, the symbols do not
>> always stay in place. They are sometimes misplaced.
>>
>>
>>
>> I've been told that problem can be that the first node of the line
>> is not always the reference to calculate the intervals.
>>
>>
>>
>> From the bottom of the symbol widget, click the "Advanced" button and
>>
>> uncheck "Clip features to canvas extent".
>>
>>
>>
>> Nyall
>>
>>
>>
>>
>>
>>
>>
>>
>>
>> You can find a GIF here that displays my problem :
>> https://zupimages.net/viewer.php?id=21/02/nvr2.gif
>>
>>
>>
>> Circles are symbols via Symbology.
>>
>> Strokes are symbos on points generated vith the tool "Points along
>> geometry".
>>
>>
>>
>> You can see that circles are not always at the same place as the strokes.
>>
>>
>>
>> Is it a "normal" behavior ?
>>
>> Anyway as a user I would expect that symbols are always generated
>> at the same place from the starting node.
>>
>>
>>
>> Thanks for your enlightments on this.
>>
>>
>>
>> J?r?mie.
>>
>> _______________________________________________
>>
>> Qgis-user mailing list
>>
>> Qgis-user at lists.osgeo.org
>>
>> List info: https://lists.osgeo.org/mailman/listinfo/qgis-user
>>
>> Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
>>
>>
>>
>>
>>
>> _______________________________________________
>>
>> Qgis-user mailing list
>>
>> Qgis-user at lists.osgeo.org
>>
>> List info: https://lists.osgeo.org/mailman/listinfo/qgis-user
>>
>> Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
>>
>>
>>
>>
>>
>>
>>
>> _______________________________________________
>>
>> Qgis-user mailing list
>>
>> Qgis-user at lists.osgeo.org
>>
>> List info: https://lists.osgeo.org/mailman/listinfo/qgis-user
>>
>> Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
>
> ------------------------------
>
>
>
> Message: 3
>
> Date: Sat, 20 Feb 2021 07:27:17 +1000
>
> From: Nyall Dawson <nyall.dawson at gmail.com>
>
> To: Bernd Vogelgesang <bernd.vogelgesang at gmx.de>
>
> Cc: Cassia Pahim <cpahim at gmail.com>, qgis-user
>
> <qgis-user at lists.osgeo.org>
>
> Subject: Re: [Qgis-user] Problem to open Raster files
>
> Message-ID:
>
> <CAB28AsjtkbLLiqy-O+LswVvgjt5Zf5crZ6YSKyk14HRSxbpUnQ at mail.gmail.com>
>
> Content-Type: text/plain; charset="UTF-8"
>
>
>
> On Sat, 20 Feb 2021 at 06:43, Bernd Vogelgesang
>
> <bernd.vogelgesang at gmx.de> wrote:
>
>> seems this a ESRI File Geodatabase (sorry, left the ESRI stage 10 years
>>
>> ago, so not sure).
>>
>>
>>
>> As far as I know, rasters can't be exctracted from this with QGIS.
>
> This is the ONLY way to use these data formats from open source
>
> software: https://github.com/r-barnes/ArcRasterRescue
>
>
>
> I've long been seeking a financial sponsor to fund development of a
>
> GDAL driver for GDB raster layers, but to date have not had any luck.
>
> If raster GDB support is important to your organisation, can you
>
> please contact me off list to discuss sponsoring this development?
>
>
>
> Thanks!
>
> Nyall
>
>> List of supported raster formats: https://gdal.org/drivers/raster/index.html
>>
>>
>>
>>
>>
>> Am 19.02.21 um 21:00 schrieb Cassia Pahim:
>>
>> They are in those formats
>>
>>
>>
>> .gdbindexes
>>
>> . gdbtable
>>
>> . horizon
>>
>> . gdbtablx
>>
>> . freelist
>>
>> . atx
>>
>> . spx
>>
>>
>>
>> Cassia
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>> Le 19 f?vr. 2021 ? 14:58, Bernd Vogelgesang
>> <bernd.vogelgesang at gmx.de> a ?crit :
>>
>>
>>
>> could you possibly share a little more details about what type of
>> rasters you are dealing with? There is a bazillion of different
>> raster formats!
>>
>>
>>
>> Am 19.02.21 um 20:47 schrieb Cassia Pahim:
>>
>> Hello,
>>
>>
>>
>> I am trying to create a map and I have 15 datasets that were sent
>> to me in a zip folder and I can?t open them into QGIS. When using
>> the icon ? add rater layer ? I get an error message telling me the
>> files are not valid or recognized. What should I do to be able to
>> work with those datasets ? Please note that I am using macOS
>> Catalina 10.15.7 and I have installed QGIS 3.16.
>>
>>
>>
>> I appreciate your help,
>>
>>
>>
>> Cassia
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>> _______________________________________________
>>
>> Qgis-user mailing list
>>
>> Qgis-user at lists.osgeo.org <mailto:Qgis-user at lists.osgeo.org>
>>
>> List info: https://lists.osgeo.org/mailman/listinfo/qgis-user
>> <https://lists.osgeo.org/mailman/listinfo/qgis-user>
>>
>> Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
>> <https://lists.osgeo.org/mailman/listinfo/qgis-user>
>>
>>
>>
>> _______________________________________________
>>
>> Qgis-user mailing list
>>
>> Qgis-user at lists.osgeo.org
>>
>> List info: https://lists.osgeo.org/mailman/listinfo/qgis-user
>>
>> Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
>
> ------------------------------
>
>
>
> Message: 4
>
> Date: Sat, 20 Feb 2021 17:04:14 +0000 (UTC)
>
> From: Fabio Falchi <fabio_falchi at yahoo.it>
>
> To: Qgis-user ML <qgis-user at lists.osgeo.org>
>
> Subject: [Qgis-user] raster with distance values from a point
>
> Message-ID: <622673810.907486.1613840654580 at mail.yahoo.com>
>
> Content-Type: text/plain; charset="utf-8"
>
>
>
> Dear all,
>
> I need to speed up the process of obtaining rasters with distances
> from a single point in it. Manually I use this procedure:With a
> georeferenced raster in a UTM projection I use raster calculator to
> obtain a raster with all pixels set to zero. Then, with Serval
> plug-in, I manually set to 1 the value of the pixel in the wanted
> position (either by using a satellite overlay or by using a point
> vector layer with the appropriate coordinates). Then I use the
> proximity function under Raster>Analisys menu.I want to make this
> via the Graphical Modeler, in order to be able to make the process
> fast and skip the manual introduction with Serval plug-in. At the
> very least, I need a mode to put the value 1 in the pixel of the
> selected null raster in the position givel by lat-lon coordinates.
>
> Thank you!Best,Fabio Falchi
>
>
>
> USC - Universidade de Santiago de Compostela
>
>
>
> ISTIL - Light Pollution Science and Technology Institute
>
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> 52******************************************
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