Re: [Qgis-user] [Qgis-psc] Welcome new QGIS community voting member

I am glad to have been part of the process, and congratulations on winning it Andrea! On Tue, Apr 5, 2022, 20:52 Andrea Giudiceandrea via Qgis-user < qgis-user@lists.osgeo.org> wrote: > Dear Marco, and community, > I am very honoured to be a community voting member! > > Thank you to all of you!

Re: [Qgis-user] Problem trying to graduate by value (colum)

On 4/6/22 6:50 PM, David Strip via Qgis-user wrote: A lot of folks get bitten by text fields that look like numbers. What if the attribute table color-coded the columns with different colors for text vs. numbers? Or had a second row of headers showing the field type? What would the disadvantage

Re: [Qgis-user] Help with scales in print layouts for geographic CRS

Hi Nyall, That would be a "nice to have"! Nicolas On 2022-04-06 9:13 p.m., Nyall Dawson via Qgis-user wrote: On Thu, 7 Apr 2022 at 10:26, Greg Troxel wrote: Nyall Dawson writes: In all cases (projected OR geographic) the scalebar logic is: 1. Create a horizontal line across the width of

Re: [Qgis-user] Help with scales in print layouts for geographic CRS

On Thu, 7 Apr 2022 at 10:26, Greg Troxel wrote: > > > Nyall Dawson writes: > > > In all cases (projected OR geographic) the scalebar logic is: > > > > 1. Create a horizontal line across the width of the layout map > > 2. Calculate the length of that line using great circle/ellipsoidal > > calcula

Re: [Qgis-user] Help with scales in print layouts for geographic CRS

Nyall Dawson writes: > In all cases (projected OR geographic) the scalebar logic is: > > 1. Create a horizontal line across the width of the layout map > 2. Calculate the length of that line using great circle/ellipsoidal > calculations, based on the project's ellipsoid settings. > 3. Compare th

Re: [Qgis-user] Help with scales in print layouts for geographic CRS

On Wed, 6 Apr 2022 at 09:34, Greg Troxel via Qgis-user wrote: > > Jorge Gustavo Rocha via Qgis-user writes: > > > I need you help to understand how scale works with geographic > > coordinate systems. In all cases (projected OR geographic) the scalebar logic is: 1. Create a horizontal line acro

Re: [Qgis-user] Help with scales in print layouts for geographic CRS

Hi, Your calculations are based on a sphere. The different crs use a geoids. It would help if you could say what crs you are using and the differences between what you get and what you expect. Nicolas Cadieux https://gitlab.com/njacadieux > Le 6 avr. 2022 à 13:13, Jorge Gustavo Rocha via Qgis-

Re: [Qgis-user] Help with scales in print layouts for geographic CRS

Hi, Thank you all for the comments. As far as I can see from my tests, the behavior is not related with the CRS in use. I've used more than one meter based projection to make sure the areas were fine. I use the advanced digitizing tools to create segments with the exact distance. Using projec

Re: [Qgis-user] relation_aggregate

Hi Graeme, I think this may be a bug, it appears that this worked at some point, https://gis.stackexchange.com/questions/222625/qgis-relation-aggregate-how-does-this-work#238265 The QEP referenced above is still open: QEP 59: Aggregate functions for QGIS expressions · Issue #59 · qgis/QGIS-Enhan

Re: [Qgis-user] Help with scales in print layouts for geographic CRS

Patrick Dunford via Qgis-user writes: > On 6/04/22 11:34, Greg Troxel via Qgis-user wrote: >> Jorge Gustavo Rocha via Qgis-user writes: >> >> 2) Using a geographic CRS, the same 150mm x 150mm map, at the same >>> 1:1 scale, the area is bigger then the 1500m polygon. The result >>> is attach

Re: [Qgis-user] Problem trying to graduate by value (colum)

A lot of folks get bitten by text fields that look like numbers. What if the attribute table color-coded the columns with different colors for text vs. numbers? Or had a second row of headers showing the field type? What would the disadvantage of such an approach? Of cour

Re: [Qgis-user] Help with scales in print layouts for geographic CRS

Hi, Great question! I am not the best person to answer it as this is a question for the Proj4 project people. They do geodesy and generally, a conversation with them bring me back to my worse math class experiences! I should have listened, I say to myself! Anyways, CRS are not all created th

Re: [Qgis-user] Problem trying to graduate by value (colum)

Thanks for the tip! Claudio Libre de virus. www.avast.com <#DAB4FAD8-2DD7-40B

Re: [Qgis-user] Problem trying to graduate by value (colum)

Hi, Your number fields are probably using a text format. You cannot graduate a text field. Create a new field (columns) with a float or int and, using the field calculator to copy the data from the text field this new field. You can also just change the field type but if you do that, backu

Re: [Qgis-user] Help with scales in print layouts for geographic CRS

On 6/04/22 11:34, Greg Troxel via Qgis-user wrote: Jorge Gustavo Rocha via Qgis-user writes: 2) Using a geographic CRS, the same 150mm x 150mm map, at the same 1:1 scale, the area is bigger then the 1500m polygon. The result is attached https://nextcloud.geomaster.pt/index.php/s/H2eAytsPAN

[Qgis-user] relation_aggregate

PUBLIC Hello, I am having issues getting relate_aggregate to do anything within expression builder. Ideally, I would like a features (1) to (m) attributes table setup correctly with a relationship to allow a user to select attributes based on attribute criteria have the corresponding related