Re: [Qgis-user] Draw Rectangle from three points - can it include distance?

[Johanna Botman]

Hi Loic,

Thanks for your answer. I saw a brief description of that as a possibility, but 
when I tried, it looked quite complicated by using x and y coordinates.
I'll have another look



Johanna Botman

Assets / GIS Officer - Melton City Council



From: Loïc Bartoletti [mailto:lbartole...@tuxfamily.org]
Sent: Thursday, 6 May 2021 4:50 PM
To: Johanna Botman ; qgis-user@lists.osgeo.org
Subject: Re: [Qgis-user] Draw Rectangle from three points - can it include 
distance?


Hi,

You can set the distance in the advanced digitzing panel [1]. All shape 
digitizing tools can be used in combination with this panel.

Regards.

Loïc
Le 06/05/2021 à 06:58, Johanna Botman a écrit :
Hi,

I need to create thousands of polygons for a layer. Sadly, they will all be 
hand drawn. The Draw Rectangle From Three Points is fabulous, but I was 
wondering if there was a way that I could easily see the measurements of the 
rectangle as I draw using that tool? Or is there another tool or method I could 
use?



Johanna Botman

Assets / GIS Officer - Melton City Council




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Re: [Qgis-user] Draw Rectangle from three points - can it include distance?

[Loïc Bartoletti]

Hi,

You can set the distance in the advanced digitzing panel [1]. All shape 
digitizing tools can be used in combination with this panel.


Regards.

Loïc

Le 06/05/2021 à 06:58, Johanna Botman a écrit :


Hi,

I need to create thousands of polygons for a layer. Sadly, they will 
all be hand drawn. The Draw Rectangle From Three Points is fabulous, 
but I was wondering if there was a way that I could easily see the 
measurements of the rectangle as I draw using that tool? Or is there 
another tool or method I could use?


**

**

*Johanna Botman*

Assets / GIS Officer – Melton City Council


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[Qgis-user] Draw Rectangle from three points - can it include distance?

[Johanna Botman]

Hi,

I need to create thousands of polygons for a layer. Sadly, they will all be 
hand drawn. The Draw Rectangle From Three Points is fabulous, but I was 
wondering if there was a way that I could easily see the measurements of the 
rectangle as I draw using that tool? Or is there another tool or method I could 
use?



Johanna Botman

Assets / GIS Officer - Melton City Council




***
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for the use of the individual or entity named above. If you are not the 
intended recipient you are hereby notified to delete the message and that any 
dissemination, copying or use of its content is strictly prohibited. If you 
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[Qgis-user] Coastline

[Iain]

This is an interesting question once you get into it. In Australia it is
compounded by States having their own "States Waters" as well as the
Commonwealth having its own waters. I once had to deal with a shipwreck
whose stern was in the State of Victoria and whose bow was in the
Commonwealth. There is an interesting discussion on the Geoscience Australia
site 

https://www.ga.gov.au/scientific-topics/marine/jurisdiction that may be of
interest as it talks also about general principals.

 

In practice I use the 0 elevation contour or shapes of the coast provided by
Government Agencies.

 

Cheers

 

Dr Iain Stuart

JCIS Consultants 

P.O. Box 2397

Burwood North

NSW, 2134

 

(02) 9701 0191
(0413) 380116 (m)

 

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Re: [Qgis-user] convex and concave areas

[Azzurra Lentini]

Hi Stefan and Sebastian, thanks a lot for your suggestions.
Azzurra

Il mer 5 mag 2021, 15:30 Sebastian Gutwein  ha scritto:

> In the QGIS toolbox there is a Saga algorithm called Terrain Surface
> Convexity that does calculate convexity or concavity. I have never used it.
> http://www.saga-gis.org/saga_tool_doc/2.2.3/ta_morphometry_21.html
> https://sourceforge.net/p/saga-gis/discussion/354013/thread/3fadd3e7/
>
> On Wed, May 5, 2021 at 4:14 AM Stefan Giese (WhereGroup) <
> stefan.gi...@wheregroup.com> wrote:
>
>> one process could be:
>>
>>- smooth the DTM by a neigbourhood analysis. The width depends on the
>>size of your convex and concave areas. you can use a mean filter or 
>> lowpass
>>for example
>>- substract the filtered from the original
>>- select values > or < your cutoff
>>- convert this into polygons
>>
>> see
>> https://www.researchgate.net/profile/Hazen-Russell/publication/277324326_A_semi-automated_esker_detection_method_EDM_for_improved_quantification_of_glaciated_landscapes/links/5567b6ca08aeab77721eac23/A-semi-automated-esker-detection-method-EDM-for-improved-quantification-of-glaciated-landscapes.pdf
>> for further reading
>>
>> Hope this helps
>>
>> Stefan
>> Am 05.05.2021 um 10:02 schrieb Azzurra Lentini:
>>
>> Hi list,
>> I need to find the convex and concave areas from a dtm raster file. Do
>> you have any suggestions?
>> Thanks
>>
>> --
>> Adjunct Professor University "Roma Tre"
>> Gis Applied for Environmental studies
>> Risk modelling & Hydrogeology
>> Consultant DFID-UK, United Nations, EU projects
>> AZZURRA LENTINI
>> ++
>> Italy Mobile Tel.: **(39) 338 24 40 676
>> ++
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>> ++
>>
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>>
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>> ++
>> *Par respect pour l'environnement,*
>>
>> *n'imprimez ce mail qu'en cas d'absolue nécessité*
>>
>>
>>
>>
>>
>>
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>> 
>> Aufwind durch Wissen!
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>> bei der www.foss-academy.com
>> 
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>> Schwimmbadstr. 2
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Re: [Qgis-user] question on advanced digitizing

[Stefan Giese (WhereGroup)]

For perfect squares better use the "Shape Digitizing Toolbar"

Am 05.05.2021 um 20:38 schrieb Gabriel Cotlier:

Hello,

I'm digitizing a square using the advanced digitizing tool, however 
when I'm about to close the rectangle's last angle, the tool 
doesn't offer me to see how to close it with a perfect square angle at 
the last click. Thus cannot finish the figure as a perfect square 
(four 90 degree angles).


How can I perform the square with the 4 perfect 90 degree angles using 
the digitizing tool?


Thanks a lot for your help.
Kind regards,
Gabriel


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[Qgis-user] question on advanced digitizing

[Gabriel Cotlier]

Hello,

I'm digitizing a square using the advanced digitizing tool, however when
I'm about to close the rectangle's last angle, the tool doesn't offer me to
see how to close it with a perfect square angle at the last click. Thus
cannot finish the figure as a perfect square (four 90 degree angles).

How can I perform the square with the 4 perfect 90 degree angles using the
digitizing tool?

Thanks a lot for your help.
Kind regards,
Gabriel
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Re: [Qgis-user] Country coastal borders

[N Sellheim]

Hi,

This is essentially a legal question based on the Law of the Sea Convention
(UNCLOS), article 5 (baselines). Except where otherwise provided, you
consider the low-water line as the determining factor as marked on
large-scale charts recognised by the coastal state. There are other
criteria for reefs, river deltas, islands etc. So it also very much depends
on what region you look at.

All the best

Nikolas

Greg Troxel  schrieb am Mi. 5. Mai 2021 um 18:34:

>
> This is complicated and jurisdiction dependent.
>
> https://en.wikipedia.org/wiki/Territorial_waters
>
> In the US there is also the Submerged Lands Act.
>
>
> So you first really have to understand enough to ask a precise question.
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Re: [Qgis-user] Country coastal borders

[Greg Troxel]

This is complicated and jurisdiction dependent.

https://en.wikipedia.org/wiki/Territorial_waters

In the US there is also the Submerged Lands Act.


So you first really have to understand enough to ask a precise question.


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[Qgis-user] (no subject)

[marco gomez]

Cinfirm
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Re: [Qgis-user] Country coastal borders

[Christine]

Hi Pat and others,

checked in an old textbook of my years of study: 
The *Mean High Water* (MHW) line forms the actual beach line or bank line. 

/[source: Wilhelmy, H. (1981): Geomorphologie in Stichworten. III Exogene
Morphodynamik. Kiel, Germany. p. 103]/

regards, Christine


chris hermansen wrote
> On Wed, May 5, 2021 at 8:10 AM Pat Brown <

> mistyhaven@

> > wrote:
> 
>> Hi
>> What constitutes a coastline? Is it the high water mark, the low
>> water
>> mark, something intermediate, the claimed territorial waters or something
>> else? I would also guess that this would differ depending on whether
>> political or geographical.





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Re: [Qgis-user] Country coastal borders

[chris hermansen]

Pat and list,

On Wed, May 5, 2021 at 8:10 AM Pat Brown  wrote:

> Hi
> What constitutes a coastline? Is it the high water mark, the low water
> mark, something intermediate, the claimed territorial waters or something
> else? I would also guess that this would differ depending on whether
> political or geographical.
>
>
> Here is an "interesting" compendium of definitions

https://www.lawinsider.com/dictionary/coastline


-- 
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C'est ma façon de parler.
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Re: [Qgis-user] Country coastal borders

[Donal Hunt]

OpenStreetMap's definition is here:
https://wiki.openstreetmap.org/wiki/Coastline

The natural=coastline tag is used to mark mean high water springs
>  (also known as
> Mean High Water Level / MHWL) which is the point of highest tide.


Donal

On Wed, 5 May 2021 at 16:10, Pat Brown  wrote:

> Hi
> What constitutes a coastline? Is it the high water mark, the low water
> mark, something intermediate, the claimed territorial waters or something
> else? I would also guess that this would differ depending on whether
> political or geographical.
>
> Thanks,
>
> Paddy
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[Qgis-user] Country coastal borders

[Pat Brown]

Hi
What constitutes a coastline? Is it the high water mark, the low water
mark, something intermediate, the claimed territorial waters or something
else? I would also guess that this would differ depending on whether
political or geographical.

Thanks,

Paddy
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Re: [Qgis-user] Extract nodes where lines are crossing other lines

[Andrea Giudiceandrea]

APM wrote
> I try to use the "Vector Intersection tool", which is demands an Input 
> and Output-Layer.
> It extracted some nodes, but not all.

Hi Piet,
it's not clear to me what exactly the tool you are using is.

Anyway I think you need to use the "Line intersections" tool. You'll find it
in the Processing toolbox or in the Vector->Analysis Tools menu.

See
https://docs.qgis.org/testing/en/docs/user_manual/processing_algs/qgis/vectoroverlay.html#line-intersections
for more details.

Regards.

Andrea



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Re: [Qgis-user] Extract nodes where lines are crossing other lines

[Michael Gieding]

Hello Piet,

you wrote that your layer is "MultiLineStringZ". Maybe one of this (MultiLine 
or 2.5d) could be a problem
for the algorithm? So I would convert it to single lines and/or drop the "Z" 
and give it a new try.
If you have PostgreSQL it would guess it's a oneliner to copy the converted 
data to a new table.
Don't know in the moment which tools in QGIS are for this task, sorry.

Maybe this helps.


Kind regards,

Michael Gieding


Von: Qgis-user  im Auftrag von Andrea 
Giudiceandrea 
Gesendet: Mittwoch, 5. Mai 2021 12:49
An: qgis-user@lists.osgeo.org
Betreff: Re: [Qgis-user] Extract nodes where lines are crossing other lines

APM wrote
> I try to use the "Vector Intersection tool", which is demands an Input
> and Output-Layer.
> It extracted some nodes, but not all.

Hi Piet,
it's not clear to me what exactly the tool you are using is.

Anyway I think you need to use the "Line intersections" tool. You'll find it
in the Processing toolbox or in the Vector->Analysis Tools menu.

See
https://docs.qgis.org/testing/en/docs/user_manual/processing_algs/qgis/vectoroverlay.html#line-intersections
for more details.

Regards.

Andrea



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Re: [Qgis-user] convex and concave areas

[Sebastian Gutwein]

In the QGIS toolbox there is a Saga algorithm called Terrain Surface
Convexity that does calculate convexity or concavity. I have never used it.
http://www.saga-gis.org/saga_tool_doc/2.2.3/ta_morphometry_21.html
https://sourceforge.net/p/saga-gis/discussion/354013/thread/3fadd3e7/

On Wed, May 5, 2021 at 4:14 AM Stefan Giese (WhereGroup) <
stefan.gi...@wheregroup.com> wrote:

> one process could be:
>
>- smooth the DTM by a neigbourhood analysis. The width depends on the
>size of your convex and concave areas. you can use a mean filter or lowpass
>for example
>- substract the filtered from the original
>- select values > or < your cutoff
>- convert this into polygons
>
> see
> https://www.researchgate.net/profile/Hazen-Russell/publication/277324326_A_semi-automated_esker_detection_method_EDM_for_improved_quantification_of_glaciated_landscapes/links/5567b6ca08aeab77721eac23/A-semi-automated-esker-detection-method-EDM-for-improved-quantification-of-glaciated-landscapes.pdf
> for further reading
>
> Hope this helps
>
> Stefan
> Am 05.05.2021 um 10:02 schrieb Azzurra Lentini:
>
> Hi list,
> I need to find the convex and concave areas from a dtm raster file. Do you
> have any suggestions?
> Thanks
>
> --
> Adjunct Professor University "Roma Tre"
> Gis Applied for Environmental studies
> Risk modelling & Hydrogeology
> Consultant DFID-UK, United Nations, EU projects
> AZZURRA LENTINI
> ++
> Italy Mobile Tel.: **(39) 338 24 40 676
> ++
> SKYPE azzurrahydro
> ++
>
> *azzurralent...@gmail.com *
>
> *azzurra.lent...@uniroma3.it  *
> ++
> *Par respect pour l'environnement,*
>
> *n'imprimez ce mail qu'en cas d'absolue nécessité*
>
>
>
>
>
>
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> Projektleiter/Consultant
> 
> Aufwind durch Wissen!
> Web-Seminare und Online-Schulungen
> bei der www.foss-academy.com
> 
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> Schwimmbadstr. 2
> 79100 Freiburg
> Germany
>
> Fon: +49 (0)761 / 519 102 - 61
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[Qgis-user] Extract nodes where lines are crossing other lines

[APM]

Dear List,

I like to extract nodes from one layer Line (MultiLineStringZ) with Qgis 
3.18.


There are lines, which crosses other lines in the same layer.

Can I extract this crossing points?

I try to use the "Vector Intersection tool", which is demands an Input 
and Output-Layer.


It extracted some nodes, but not all.

Can you give me a tipp, please?

Thank you!

KR

Piet

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Re: [Qgis-user] convex and concave areas

[Stefan Giese (WhereGroup)]

one process could be:

 * smooth the DTM by a neigbourhood analysis. The width depends on the
   size of your convex and concave areas. you can use a mean filter or
   lowpass for example
 * substract the filtered from the original
 * select values > or < your cutoff
 * convert this into polygons

see 
https://www.researchgate.net/profile/Hazen-Russell/publication/277324326_A_semi-automated_esker_detection_method_EDM_for_improved_quantification_of_glaciated_landscapes/links/5567b6ca08aeab77721eac23/A-semi-automated-esker-detection-method-EDM-for-improved-quantification-of-glaciated-landscapes.pdf 
for further reading


Hope this helps

Stefan

Am 05.05.2021 um 10:02 schrieb Azzurra Lentini:

Hi list,
I need to find the convex and concave areas from a dtm raster file. Do 
you have any suggestions?

Thanks

--
Adjunct Professor University "Roma Tre"
Gis Applied for Environmental studies
Risk modelling & Hydrogeology
Consultant DFID-UK, United Nations, EU projects
AZZURRA LENTINI
++
Italy Mobile Tel.: **(39) 338 24 40 676
++
SKYPE azzurrahydro
++

*_azzurralent...@gmail.com _*

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[Qgis-user] convex and concave areas

[Azzurra Lentini]

Hi list,
I need to find the convex and concave areas from a dtm raster file. Do you
have any suggestions?
Thanks

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Adjunct Professor University "Roma Tre"
Gis Applied for Environmental studies
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AZZURRA LENTINI
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Italy Mobile Tel.: **(39) 338 24 40 676
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