[Qgis-user] question on advanced digitizing

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).

Re: [Qgis-user] question on advanced digitizing

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

Re: [Qgis-user] convex and concave areas

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. >

[Qgis-user] Coastline

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.

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

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

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

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

Re: [QGIS-it-user] Fwd: [QGIS-Developer] 2021 QGIS Grant Proposals final results

ghtmtt wrote > ecco i vincitori delle Grant Proposals 2021 > > ci sono proposte molto interessanti Grazie, ottime proposte. saluti - https://pigrecoinfinito.com/ -- Sent from: http://osgeo-org.1560.x6.nabble.com/QGIS-Italian-User-f5250612.html

[Qgis-user] convex and concave areas

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

Re: [Qgis-user] convex and concave areas

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

Re: [Qgis-user] convex and concave areas

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,

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

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

[QGIS-it-user] Geoaperitivo Maggio

Ciao a tutti, vi ricordo che il prossimo 10 maggio abbiamo il Geaperitivo con Faunalia: https://www.faunalia.eu/it/blog/2021-05-05_geoaperitivo_maggio mettete in frigo le birre :) Matteo ___ QGIS-it-user mailing list QGIS-it-user@lists.osgeo.org

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

Re: [Qgis-user] Country coastal borders

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 >

Re: [Qgis-user] Country coastal borders

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

[Qgis-user] Country coastal borders

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

Re: [Qgis-user] Country coastal borders

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.

Re: [Qgis-user] Country coastal borders

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. signature.asc Description: PGP signature

Re: [Qgis-user] Country coastal borders

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

[Qgis-user] (no subject)

Cinfirm ___ Qgis-user mailing list Qgis-user@lists.osgeo.org List info: https://lists.osgeo.org/mailman/listinfo/qgis-user Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user