Re: [Qgis-user] Problem georeferencing images in UTM

I haven't been able to open the dataset but going through the discussion I would like to offer some assistance since I believe there are some misconceptions here: First, the data has nothing to do with the NAD27 / NAD83 datum's since these are North American datum's and they don't apply I believe

Re: [Qgis-user] results Measure Tool vs. length()

Interesting and alarming observation. And how do those results compare with output from the $length variable? Cheers . . . . . Springfield Samsung Tab 4 On May 17, 2018 5:26 AM, "Michel Stuyts" wrote: > In the length() function QGIS uses the CRS unit of the layer to

Re: [Qgis-user] Problem georeferencing images in UTM

Thanks for the input Nicolas These are official maps so the utm grid is ok. I figured that I was using a linear transformation, with the option to just create the world file, which works for control points at the corners (lat/long), since the boundaries of the map is defined by

Re: [Qgis-user] Problem georeferencing images in UTM

Hi, The utm grid is way off or we have the wrong epsg code. If you geofence using 2 points (linear algo) using a service like google earth, you will see the distortion. The long lat coordinate are probably ok but I did not test them. You can either use the long lat or use more points. With

Re: [Qgis-user] Problem georeferencing images in UTM

Hi, I am looking at your maps now. If I understand, it works with lat long but not the UTM Coordinates. It could be a mistake in the utm grid. Perhaps one utm grid is in NAD27 and the other in NAD83. That could explain the shift. I will look at it. Nicolas > Le 17 mai 2018 à 12:42,

Re: [Qgis-user] Problem georeferencing images in UTM

When using the georeferencer some of the methods require at least 3 points, even though you might think it not necessary. Otherwise you can get unusual results. Steve -- Sent from: http://osgeo-org.1560.x6.nabble.com/QGIS-User-f4125267.html ___

Re: [QGIS-it-user] Qgis 2.18 - DWG\DXF Import

non ritengo che togliere una utilissima e ben fatta importazione dei DWG sia una soluzione , mi sembra come andare dal dottore perché mi fa male la gamba e quello dice tagliamola ! se abbiamo un DWG da portare in QGIS si fa prima ad importarlo direttamente che trasformarlo usando un terzo

Re: [Qgis-user] Problem georeferencing images in UTM

Thanks Nicolas, but the misalignment still persists. OTF is off, project has same CRS as data (epsg 29192). There is a ~400m difference in the N-S direction. Carlos On Thu, May 17, 2018 at 1:28 PM, Nicolas Cadieux < nicolas.cadi...@archeotec.ca> wrote: > Hi, > Disable projection on the fly.

Re: [Qgis-user] Problem georeferencing images in UTM

Hi, Disable projection on the fly. Make sure the project is in the same CRS as your maps. Nicolas > Le 17 mai 2018 à 12:14, Carlos Henrique Grohmann de Carvalho > a écrit : > > Hello all > > I have two pngs of topographic maps from southeastern Brazil (a zip file

[Qgis-user] Problem georeferencing images in UTM

Hello all I have two pngs of topographic maps from southeastern Brazil (a zip file with images and points is available here: https://www.dropbox.com/ s/mexeh4be46pgsk6/images_georef.zip?dl=0) I'm trying to georeference them, but with partial success only. In this image

Re: [QGIS-it-user] Qgis 2.18 - DWG\DXF Import

nformica wrote > Riassumendo un pò tutti gli interventi riportati in questo thread, > secondo me la conclusione è questa: > l'apertura diretta come layer vett. o la importazione in GeoPackage > -) dei file DXF funziona sempre > -) dei file DWG no, e non è molto chiaro da cosa dipenda la riuscita o

Re: [Qgis-user] model built in QGIS2 to be imported in QGIS3

Hi, Processing in QGIS 3 was refactored a lot and many algorithms were changed. So it is not possible to covert old models into new format. You need to recreate it. 2018-05-17 16:47 GMT+03:00 frippe12573 : > Hi all, > > I'm using Qgis3, and I would like to use the models

[Qgis-user] model built in QGIS2 to be imported in QGIS3

Hi all, I'm using Qgis3, and I would like to use the models I prepared in the past with Qgis2. I saw that the created files (i.e., .model and .model3) look like different. I presume it is not possible to import the old model file, so that I wonder if there is a way to convert the old file in the

[Qgis-user] results Measure Tool vs. length()

In the length() function QGIS uses the CRS unit of the layer to calculate the result. When I use for example a layer in a local CRS like EPSG:31370 or EPSG:5439 and a layer in EPSG:3857 (that all use meters as unit) the results are very different (+40% difference). Changing the project CRS

Re: [QGIS-it-user] Qgis 2.18 - DWG\DXF Import

Riassumendo un pò tutti gli interventi riportati in questo thread, secondo me la conclusione è questa: l'apertura diretta come layer vett. o la importazione in GeoPackage -) dei file DXF funziona sempre -) dei file DWG no, e non è molto chiaro da cosa dipenda la riuscita o meno (dalla versione

Re: [QGIS-it-user] Plugin line to polygon

...scusa se mi intrometto nelle tue scelte ma perchè non passi alla 2.18 LTR ? ...è aggiornatissima e stabilissima ...o, addirittura, perchè non provi il brivido della 3.x ? Il giorno 17 maggio 2018 12:07, Matteo Collimedaglia < matteo.collimedaglia...@gmail.com> ha scritto: > Ho

[QGIS-it-user] R: Problema all'avvio QGIS

Buongiorno, e scusate il ritardo della risposta. Innanzitutto, vi ringrazio per i suggerimenti che mi avete dato finora. Sono riuscita solo ora a mettere in pratica tutto quanto mi avete detto, e ho provato anche ad installare quelle librerie che mancavano. Il messaggio di errore (che

Re: [QGIS-it-user] Join tabellare con due campi di unione

Grazie mille, ma alla fine ho risolto con la concatenazione delle coordinate del baricentro in un'unica colonna (sia su csv che sugli attributi dello shp), facendo attenzione però alla precisione delle cifre decimali (questo mi ha impiegato un po' di tempo). Ho usato quindi come campo di unione

Re: [QGIS-it-user] Plugin line to polygon

Probabilmente non ho capito bene o mi sfugge qualcosa della tua richiesta. In Vettore --> Strumenti di geometria c'è la storica funzione per trasformare le polilinee in poligoni e comunque, in Processing, puoi trovare una vagonata di funzioni simili. Forse ti riferisci ad uno specifico Plugin (che