Re: [Qgis-user] Output to pdf file doesn't contain vector details

[Frank Broniewski via QGIS-User]

In addition to the free resource, I can highly recommend the two books “QGIS 
Map Design” [1] and “QGIS Map Design - Second Edition” [2] by Anita Graser and 
Gretchen N. Peterson with tons of great map designs and how to create them. 
They base on somewhat dated QGIS versions by now, but the content itself is 
still super valuable.

[1] https://locatepress.com/book/qmd
[2] https://locatepress.com/book/qmd2
Von: QGIS-User  Im Auftrag von Emma Hain via 
QGIS-User
Gesendet: Mittwoch, 20. September 2023 04:11
An: chris hermansen 
Cc: qgis-user@lists.osgeo.org
Betreff: Re: [Qgis-user] Output to pdf file doesn't contain vector details

Michael and list,

But, it should also be possible to use Qgis to (say) input GIS data files in 
one format (such as NASA's SRTM “tiles”), then output the data in another 
vector-graphics format (such as .shp shapefiles or .svg files) – for directing 
the data to another application for further processing, as convenient – whether 
or not Qgis technically can do much the same further processing.
This can be done by undertaking transformations. In the Processing tools panel, 
type in the search bar  'convert' and select the appropriate tool - however if 
you are unsure of what you are doing, you may introduce positional and other 
errors. By sticking with the cartographic process within QGIS and importing in 
your other elements, this would produce a more accurate response. I would also 
really learn about Coordinate Reference Systems (CRS) as well. A map is 
different to a graphic is you are placing disparate datasets together.

I would totally support learning about the strengths of the cartography of 
QGIS. It is developed by people who love the art of cartography so perhaps you 
should harness this? I do understand though that you work with what you have 
the most experience with.

However, if you do want to go down the path of using QGIS' cartographic power, 
here are some really helpful online free tutorials: 
https://www.qgistutorials.com/en/

If you would like additional features in QGIS, please feel free to add them to 
here <https://github.com/qgis/QGIS/issues> and label them as a feature 
enhancement.

Good luck
Em




On Tue, 19 Sept 2023 at 03:32, chris hermansen via QGIS-User 
mailto:qgis-user@lists.osgeo.org>> wrote:
Michael and list,

I've been following along trying some stuff with data I have on hand and offer 
you some comments below.

On Mon, Sep 18, 2023 at 9:25 AM Michael McNeil 
mailto:memcnei...@gmail.com>> wrote:
The foregoing got sent before it was ready, sorry. I'll just continue from 
where I left off.

As I said, I would prefer to use shapefiles to transfer the data – that is 
intended to be an interim format – however CorelDraw doesn't accept shapefiles 
(.shp) , though it does svg. But I've found that the reason why I can't produce 
svg (and pdf) files containing the detailed vector-graphics data that I wish to 
include in the map, for transfer into CorelDraw, is because Qgis believes (so I 
surmise) that I must want to ultimately print out the data – and because 
printers (or engravers, or whatever) inherently must have a maximum resolution 
they can render, Qgis has thoughtfully determined that that maximum should be 
no greater than 3000 dpi (with a mere 300 dpi being the default).

That, of course (the Export Resolution), is why my detailed contour lines are 
being rendered (upon Layout) into mere solid blobs of color – accompanied by an 
80 MB pdf file! It seems crazy to me.

Not sure you're correct here - did you select "Always export as vectors" in the 
SVG (or PDF) export window?  If so, then your vectors are not being rasterized. 
 However, they ARE being reproduced at the thickness determined by your 
settings and the print scale.


Why? Because – regardless of the merits of being able to transfer 
full-resolution vector graphics using the svg and pdf formats – there's also 
the possibility (which the powers at be at Qgis don't seem to realize – I'm 
sure you all will correct me on this) of using (say) pdf format as a 
presentation medium for Qgis' (and others') vector-graphics maps. By 
presentation I mean an interactive experience for viewing maps – in other 
words, the Qgis output should not just be for printout.

[examples deleted]

The SVG conversion you are using is part of the QGIS "print layout manager" 
functionality, where the user is preparing a cartographic product for 
reproduction at a certain scale and resolution.  So it's quite reasonable that 
such functionality would behave the way QGIS doe; someone using QGIS to make a 
cartographic product they intend to be used at a print size of 8.5 X 11 inches 
or 1 X 2 metres would expect to see lines of a chosen thickness when the 
product is reproduced at that desired scale.

Accordingly, one thing that might help is if you choose a larger page size, the 
default being A4 or US Letter.  You might also try experimenting with layer 
Properties &

Re: [Qgis-user] Output to pdf file doesn't contain vector details

[Emma Hain via QGIS-User]

 Michael and list,

But, it should also be possible to use Qgis to (say) input GIS data files
> in one format (such as NASA's SRTM “tiles”), then output the data in
> another vector-graphics format (such as .shp shapefiles or .svg files) –
> for directing the data to another application for further processing, as
> convenient – whether or not Qgis technically can do much the same further
> processing.
>
This can be done by undertaking transformations. In the Processing tools
panel, type in the search bar  'convert' and select the appropriate tool -
however if you are unsure of what you are doing, you may introduce
positional and other errors. By sticking with the cartographic process
within QGIS and importing in your other elements, this would produce a more
accurate response. I would also really learn about Coordinate Reference
Systems (CRS) as well. A map is different to a graphic is you are placing
disparate datasets together.

I would totally support learning about the strengths of the cartography of
QGIS. It is developed by people who love the art of cartography so perhaps
you should harness this? I do understand though that you work with what you
have the most experience with.

However, if you do want to go down the path of using QGIS' cartographic
power, here are some really helpful online free tutorials:
https://www.qgistutorials.com/en/

If you would like additional features in QGIS, please feel free to add them
to here and label them as a feature
enhancement.

Good luck
Em




On Tue, 19 Sept 2023 at 03:32, chris hermansen via QGIS-User <
qgis-user@lists.osgeo.org> wrote:

> Michael and list,
>
> I've been following along trying some stuff with data I have on hand and
> offer you some comments below.
>
> On Mon, Sep 18, 2023 at 9:25 AM Michael McNeil 
> wrote:
>
>> The foregoing got sent before it was ready, sorry. I'll just continue
>> from where I left off.
>>
>> As I said, I would prefer to use shapefiles to transfer the data – that
>> *is* intended to be an interim format – however CorelDraw doesn't accept
>> shapefiles (.shp) , though it does svg. But I've found that the reason why
>> I can't produce svg (and pdf) files containing the detailed vector-graphics
>> data that I wish to include in the map, for transfer into CorelDraw, is
>> because Qgis believes (so I surmise) that I must want to ultimately *print
>> out* the data – and because printers (or engravers, or whatever)
>> inherently must have a maximum resolution they can render, Qgis has
>> thoughtfully determined that that maximum should be no greater than 3000
>> dpi (with a mere 300 dpi being the default).
>>
>
>> That, of course (the Export Resolution), is why my detailed contour lines
>> are being rendered (upon Layout) into mere solid blobs of color –
>> accompanied by an 80 MB pdf file! It seems crazy to me.
>>
>
> Not sure you're correct here - did you select "Always export as vectors"
> in the SVG (or PDF) export window?  If so, then your vectors are not being
> rasterized.  However, they ARE being reproduced at the thickness determined
> by your settings and the print scale.
>
>
>>
>> Why? Because – regardless of the merits of being able to transfer
>> full-resolution vector graphics using the svg and pdf formats – there's
>> also the possibility (which the powers at be at Qgis don't seem to realize
>> – I'm sure you all will correct me on this) of using (say) pdf format as a 
>> *presentation
>> medium* for Qgis' (and others') vector-graphics maps. By presentation I
>> mean an interactive experience for viewing maps – in other words, the Qgis
>> output should not just be for *printout*.
>>
>
> [examples deleted]
>
> The SVG conversion you are using is part of the QGIS "print layout
> manager" functionality, where the user is preparing a cartographic product
> for reproduction at a certain scale and resolution.  So it's quite
> reasonable that such functionality would behave the way QGIS doe; someone
> using QGIS to make a cartographic product they intend to be used at a print
> size of 8.5 X 11 inches or 1 X 2 metres would expect to see lines of a
> chosen thickness when the product is reproduced at that desired scale.
>
> Accordingly, one thing that might help is if you choose a larger page
> size, the default being A4 or US Letter.  You might also try experimenting
> with layer Properties > Symbology > Stroke width.  This won't give you the
> "infinite zoom" you hope for, but the lines will appear finer when zoomed
> out to full screen and zoomed in to 100% zoom, assuming you selected a fine
> stroke width.
>
> I can understand your idea that SVG does after all mean "Scalable", but it
> seems to me that the incorporation of the SVG export into the QGIS print
> layout manager is not going to go in the direction you want.
>
> You may be able to edit the line parameters in the SVG file once you
> import it into Corel Draw.  I tried using LibreOffice Draw; I first
> ungrouped all the 

Re: [Qgis-user] Output to pdf file doesn't contain vector details

[chris hermansen via QGIS-User]

Michael and list,

I've been following along trying some stuff with data I have on hand and
offer you some comments below.

On Mon, Sep 18, 2023 at 9:25 AM Michael McNeil  wrote:

> The foregoing got sent before it was ready, sorry. I'll just continue from
> where I left off.
>
> As I said, I would prefer to use shapefiles to transfer the data – that
> *is* intended to be an interim format – however CorelDraw doesn't accept
> shapefiles (.shp) , though it does svg. But I've found that the reason why
> I can't produce svg (and pdf) files containing the detailed vector-graphics
> data that I wish to include in the map, for transfer into CorelDraw, is
> because Qgis believes (so I surmise) that I must want to ultimately *print
> out* the data – and because printers (or engravers, or whatever)
> inherently must have a maximum resolution they can render, Qgis has
> thoughtfully determined that that maximum should be no greater than 3000
> dpi (with a mere 300 dpi being the default).
>

> That, of course (the Export Resolution), is why my detailed contour lines
> are being rendered (upon Layout) into mere solid blobs of color –
> accompanied by an 80 MB pdf file! It seems crazy to me.
>

Not sure you're correct here - did you select "Always export as vectors" in
the SVG (or PDF) export window?  If so, then your vectors are not being
rasterized.  However, they ARE being reproduced at the thickness determined
by your settings and the print scale.


>
> Why? Because – regardless of the merits of being able to transfer
> full-resolution vector graphics using the svg and pdf formats – there's
> also the possibility (which the powers at be at Qgis don't seem to realize
> – I'm sure you all will correct me on this) of using (say) pdf format as a 
> *presentation
> medium* for Qgis' (and others') vector-graphics maps. By presentation I
> mean an interactive experience for viewing maps – in other words, the Qgis
> output should not just be for *printout*.
>

[examples deleted]

The SVG conversion you are using is part of the QGIS "print layout manager"
functionality, where the user is preparing a cartographic product for
reproduction at a certain scale and resolution.  So it's quite reasonable
that such functionality would behave the way QGIS doe; someone using QGIS
to make a cartographic product they intend to be used at a print size of
8.5 X 11 inches or 1 X 2 metres would expect to see lines of a chosen
thickness when the product is reproduced at that desired scale.

Accordingly, one thing that might help is if you choose a larger page size,
the default being A4 or US Letter.  You might also try experimenting with
layer Properties > Symbology > Stroke width.  This won't give you the
"infinite zoom" you hope for, but the lines will appear finer when zoomed
out to full screen and zoomed in to 100% zoom, assuming you selected a fine
stroke width.

I can understand your idea that SVG does after all mean "Scalable", but it
seems to me that the incorporation of the SVG export into the QGIS print
layout manager is not going to go in the direction you want.

You may be able to edit the line parameters in the SVG file once you import
it into Corel Draw.  I tried using LibreOffice Draw; I first ungrouped all
the elements in the SVG, selected some lines and then edited the line
styles.  This produced an SVG with nice thin zoomable lines.

>
> If that had been a map of (say) southern Great Britain (about 300 miles
> wide), a 6400% zoom would bring you up on any given *5 mile* stretch of
> the map. Nor does a limit of 64x zoom appear to be inherent in the pdf
> format – it's merely the viewer app designer's option, best I can tell.
>

Not sure what viewer app you're referring to here so I'll skip over this.

>
> Why wouldn't anybody (Qgis, for instance) *want* the capability of
> producing output maps that one can do that with – if desired by the map's
> creator! Why choose to enforce pixelation onto a vector format where it
> isn't inherent?
>

As I mentioned above, you're able to not rasterize, and if you do so, your
line thickness is a result of your output settings including line "weight"
and page size, ie intended print resolution, not pixelation.

Maybe you should look at a different QGIS export pathway, which you can
find by right-clicking on the layer you want to export, selecting  "Export
> Save Features As..." and working with whatever format that appears in
that list that works with Corel Draw (maybe AutoCAD DXF?).


> I suggest that that a specific Export Resolution dpi value in Qgis' Layout
> settings be made optional – with “Unlimited” as another option.
>

If SVG were one of the layer export options, I imagine it would be intended
to work this way.


>
> Best,
> Michael McNeil
>
>
>
> On Mon, Sep 18, 2023 at 8:43 AM Michael McNeil 
> wrote:
>
>> Chris, Garth, others,
>>
>> Now that we've resolved the issue of reentering Qgis and accessing my
>> previously saved project data (thanks again, Garth!), I can go on to
>> 

Re: [Qgis-user] Output to pdf file doesn't contain vector details

[Michael McNeil via QGIS-User]

Chris, Garth, others,

Now that we've resolved the issue of reentering Qgis and accessing my
previously saved project data (thanks again, Garth!), I can go on to
investigate whether Qgis can serve as my entire graphics toolkit for
working on and producing the final output version of maps. I certainly
wouldn't mind that being the case (even though powerful vector-graphics
tools such as CorelDraw also have their place, I maintain).

*Shapefiles*

But, it should also be possible to use Qgis to (say) input GIS data files
in one format (such as NASA's SRTM “tiles”), then output the data in
another vector-graphics format (such as .shp shapefiles or .svg files) –
for directing the data to another application for further processing, as
convenient – whether or not Qgis technically can do much the same further
processing.

In this regard, I generated shapefiles corresponding to the input SRTM
data, but I encountered 2 problems there: First, my preferred secondary
application CorelDraw does not accept .shp (and associated files) input –
though it does read .svg and .pdf files.

Second, to get past this initial limitation, I attempted to input Qgis'
output shapefiles to the website Aspose's page for converting shapefiles
into svg files only to have it declare allQgis' shapefiles to be “invalid
data.” I have a trouble report in with them about that.





I would prefer to use shapefiles to transfer the data – that is intended to
be an interim format – however CorelDraw doesn't accept shapefiles (.shp) ,
but it does svg

On Wed, Sep 13, 2023 at 12:18 PM chris hermansen 
wrote:

> Michael and list.
>
> On Wed, Sep 13, 2023 at 10:22 AM Michael Edward McNeil <
> memcnei...@gmail.com> wrote:
>
>> Chris, I could experiment with QGIS's cartography capabilities more if I
>> could save my project, exit, and then resume working on it later. My other
>> problem with QGIS interferes with that potential procedure.
>>
>
> Perhaps there is a degree of misunderstanding here.
>
> When you work with say Microsoft Word to eventually produce a document
> that you will export to PDF to send to others, you don't save your interim
> work in PDF; you save it in Word's internal format, .docx.
>
> Similarly with QGIS, you save an ongoing piece of work as a project. Look
> at the Project menu item, where you will see the ability to Save or Save
> As.  When you're ready to export your work to PDF or some other output
> format, there is an "export work flow".
>
> There is also an important QGIS component not immediately visible, which
> is the Print Layout, also available in the Project menu item.
>
> You might wish to follow through the online documentation here
> https://docs.qgis.org/3.28/en/docs/training_manual/map_composer/map_composer.html
> to see how that component is used to make a map, with surround, annotation,
> etc ready for export to PDF as a finished product.
>
> So the overall workflow is to assemble the various layers you wish to
> depict on the main QGIS screen, applying symbology to each layer; then open
> a print layout to wrap up what's on screen into a full map composition.
>
>
>> Yes, aligning a single layer in another app with its true position is a
>> problem. If I continue trying to do it this way, I'd probably also output
>> meridians and possibly other clues (e.g., the British coastline) to allow
>> aligning it properly.
>>
>
> Don't forget that you can add useful raster layers, like Open Street Map,
> to your screen and map composition, to save yourself a lot of time with
> respect to tracking down vector or raster data sets, symbolizing them, and
> so forth.
>
>
> --
> Chris Hermansen · clhermansen "at" gmail "dot" com
>
> C'est ma façon de parler.
>
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Re: [Qgis-user] Output to pdf file doesn't contain vector details

[chris hermansen via QGIS-User]

Michael and list.

On Wed, Sep 13, 2023 at 10:22 AM Michael Edward McNeil 
wrote:

> Chris, I could experiment with QGIS's cartography capabilities more if I
> could save my project, exit, and then resume working on it later. My other
> problem with QGIS interferes with that potential procedure.
>

Perhaps there is a degree of misunderstanding here.

When you work with say Microsoft Word to eventually produce a document that
you will export to PDF to send to others, you don't save your interim work
in PDF; you save it in Word's internal format, .docx.

Similarly with QGIS, you save an ongoing piece of work as a project. Look
at the Project menu item, where you will see the ability to Save or Save
As.  When you're ready to export your work to PDF or some other output
format, there is an "export work flow".

There is also an important QGIS component not immediately visible, which is
the Print Layout, also available in the Project menu item.

You might wish to follow through the online documentation here
https://docs.qgis.org/3.28/en/docs/training_manual/map_composer/map_composer.html
to see how that component is used to make a map, with surround, annotation,
etc ready for export to PDF as a finished product.

So the overall workflow is to assemble the various layers you wish to
depict on the main QGIS screen, applying symbology to each layer; then open
a print layout to wrap up what's on screen into a full map composition.


> Yes, aligning a single layer in another app with its true position is a
> problem. If I continue trying to do it this way, I'd probably also output
> meridians and possibly other clues (e.g., the British coastline) to allow
> aligning it properly.
>

Don't forget that you can add useful raster layers, like Open Street Map,
to your screen and map composition, to save yourself a lot of time with
respect to tracking down vector or raster data sets, symbolizing them, and
so forth.


-- 
Chris Hermansen · clhermansen "at" gmail "dot" com

C'est ma façon de parler.
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Re: [Qgis-user] Output to pdf file doesn't contain vector details

[Michael Edward McNeil via QGIS-User]

Chris, I could experiment with QGIS's cartography capabilities more if I could save my project, exit, and then resume working on it later. My other problem with QGIS interferes with that potential procedure.Yes, aligning a single layer in another app with its true position is a problem. If I continue trying to do it this way, I'd probably also output meridians and possibly other clues (e.g., the British coastline) to allow aligning it properly.Thanks for your perspective!Michael McNeilOn Sep 13, 2023, at 10:06, chris hermansen  wrote:Michael and list,On Wed, Sep 13, 2023 at 10:00 AM Michael Edward McNeil via QGIS-User  wrote:I'm an almost total novice with regard to GIS in general and QGIS in particular. Nonetheless I've been attempting to put together a test map (using data I will make use of, in part) utilizing the contour lines for the island of Great Britain – obtaining data in that regard from the space shuttle's worldwide Shuttle Radar Topography Mission (SRTM).

I obtained the data and loaded it into QGIS, no problem. After extracting the contours, the lines shown in QGIS are nice and sharp, and vectorize properly when zooming in and out. I'm using 100 meters between lines (rather than the default 10 m) which means that in some regions of the planet, they're not all that dense; nonetheless if you're looking at a larger scale view of, say, Wales or Scotland, the contour lines show up at that scale as generally pretty dense. The solution, of course, using vector graphics is to zoom in, then you can see the full detail.

Anyway, things are fine while still within QGIS (except for the secondary issue noted below). However, I wanted to output the vectorized contour lines into a file I could input into (e.g.) CorelDRAW to add other layers and do the graphical finishing touches on the desired map. I tried svg format – got the message about svg handling in QGIS being buggy – and indeed the svg output didn't seem to work.Is there any reason you can't do your cartography within QGIS?  Or at least, make a "simplified" draft map, save as an image or PDF, and then do whatever "graphical finishing" required in your desktop publishing application? I think this would be a more "normal" approach, rather than exporting a layer by itself, if for no other reason than your geospatial information will be properly aligned by QGIS in the final product.-- Chris Hermansen · clhermansen "at" gmail "dot" comC'est ma façon de parler.
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Re: [Qgis-user] Output to pdf file doesn't contain vector details

[chris hermansen via QGIS-User]

Michael and list,

On Wed, Sep 13, 2023 at 10:00 AM Michael Edward McNeil via QGIS-User <
qgis-user@lists.osgeo.org> wrote:

> I'm an almost total novice with regard to GIS in general and QGIS in
> particular. Nonetheless I've been attempting to put together a test map
> (using data I will make use of, in part) utilizing the contour lines for
> the island of Great Britain – obtaining data in that regard from the space
> shuttle's worldwide Shuttle Radar Topography Mission (SRTM).
>
> I obtained the data and loaded it into QGIS, no problem. After extracting
> the contours, the lines shown in QGIS are nice and sharp, and vectorize
> properly when zooming in and out. I'm using 100 meters between lines
> (rather than the default 10 m) which means that in some regions of the
> planet, they're not all that dense; nonetheless if you're looking at a
> larger scale view of, say, Wales or Scotland, the contour lines show up at
> that scale as generally pretty dense. The solution, of course, using vector
> graphics is to zoom in, then you can see the full detail.
>
> Anyway, things are fine while still within QGIS (except for the secondary
> issue noted below). However, I wanted to output the vectorized contour
> lines into a file I could input into (e.g.) CorelDRAW to add other layers
> and do the graphical finishing touches on the desired map. I tried svg
> format – got the message about svg handling in QGIS being buggy – and
> indeed the svg output didn't seem to work.
>

Is there any reason you can't do your cartography within QGIS?  Or at
least, make a "simplified" draft map, save as an image or PDF, and then do
whatever "graphical finishing" required in your desktop publishing
application?

I think this would be a more "normal" approach, rather than exporting a
layer by itself, if for no other reason than your geospatial information
will be properly aligned by QGIS in the final product.


-- 
Chris Hermansen · clhermansen "at" gmail "dot" com

C'est ma façon de parler.
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[Qgis-user] Output to pdf file doesn't contain vector details

[Michael Edward McNeil via QGIS-User]

I'm an almost total novice with regard to GIS in general and QGIS in 
particular. Nonetheless I've been attempting to put together a test map (using 
data I will make use of, in part) utilizing the contour lines for the island of 
Great Britain – obtaining data in that regard from the space shuttle's 
worldwide Shuttle Radar Topography Mission (SRTM).

I obtained the data and loaded it into QGIS, no problem. After extracting the 
contours, the lines shown in QGIS are nice and sharp, and vectorize properly 
when zooming in and out. I'm using 100 meters between lines (rather than the 
default 10 m) which means that in some regions of the planet, they're not all 
that dense; nonetheless if you're looking at a larger scale view of, say, Wales 
or Scotland, the contour lines show up at that scale as generally pretty dense. 
The solution, of course, using vector graphics is to zoom in, then you can see 
the full detail.

Anyway, things are fine while still within QGIS (except for the secondary issue 
noted below). However, I wanted to output the vectorized contour lines into a 
file I could input into (e.g.) CorelDRAW to add other layers and do the 
graphical finishing touches on the desired map. I tried svg format – got the 
message about svg handling in QGIS being buggy – and indeed the svg output 
didn't seem to work.

So, I tried pdf. What I get there (out of an 80 GB resulting pdf file!) is 
simply solid color – not distinguishable contour lines – in regions where the 
lines would otherwise (at a larger scale) be dense. I told the output Layout 
page that it should vectorize all output – but zooming in doesn't help. (I 
recall that my svg format experiment also similarly produced solid color and 
lacked contour detail.)

What am I doing wrong?

A secondary issue, by the way, is that I apparently can't see the data after I 
save my QGIS project, close and re-enter the app. After re-entering QGIS the 
Layers pane shows all the layers, all properly check-marked for visibility, 
just like before, but nothing shows up in the display window – it's totally 
blank white. So… I'm surviving by never (or seldom – then reloading the data) 
leaving the app. But, what's going on?

I'm running QGIS v. 3.32.2-Lima under MacOS 12.6.8.

Thanks, all.

Best,
Michael McNeil


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