Re: [Qgis-user] Bringing georeferenced rasters into QGIS

[Patrick Dunford]

The world file only contains the coordinates and pixel size information 
for a raster file that tell Qgis where to place it on the canvas and how 
wide to draw it. This information is in the coordinates of a particular 
CRS. The world file does not actually specify the CRS. The CRS is 
specified in another file.


e.g. if I have a file called 123.jpg the world file for it will be 123.jgw

The other files (one of which at least specifies the CRS) that the 
rasters I download from a particular web site I source a lot of rasters 
from) could include:


123.xml

123.jpg.aux.xml


On 3/04/19 7:29 PM, j...@jmcgeo.com wrote:


Hi, first post here.  I am migrating an old project to QGIS to see how 
it handles my day to day work and have hit a snag.


QGIS doesn’t seem to recognise my world files.  Generally these follow 
the following filename convention:


XXX.jpg -à XXX.jgw

XXX.tif -à XXX.tfw

I have tried creating a file XXX.wld and the georeferencing tool 
cautions me that it is there and overwrites it, but when I put the old 
data back in it, it still pays no attention.  The XXX.yzW files were 
created in the ArcGIS georeferencing tool and work fine in ArcGIS and 
Mapinfo.


Thanks in advance.


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Re: [Qgis-user] locating layer

[Mike Flannigan]

Thank you very much.  That "Type to locate" is very handy.
I really needed to know about that.
I owe you one.



Mike


On 4/3/2019 3:46 AM, DelazJ wrote:

Hi Mike,

You don't need to look for it or display it; it's there by default: 
the status bar is the bar at the bottom of the QGIS dialog, showing 
coordinate box, scale, magnifier... point 5 of the outdated screenshot 
at 
https://docs.qgis.org/testing/en/docs/user_manual/introduction/qgis_gui.html#qgis-gui 
At its left side (not visible on the screenshot since it's from 2.x 
and not up to date), there's a textbox with a magnifier and  "Type to 
locate (Ctrl+K)" text within.
Just type in *l layername* or simply the layer name and you should get 
what you want.
See also 
https://qgis.org/en/site/forusers/visualchangelog30/index.html#feature-locator-bar


Harrissou



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Re: [Qgis-user] Bringing georeferenced rasters into QGIS

[Nicolas Cadieux]

Hi,

Found this on https://www.gdal.org/frmt_various.html#WLD.
“WLD -- ESRI World File

A world file file is a plain ASCII text file consisting of six values separated 
by newlines. The format is: 

pixel X size rotation about the Y axis (usually 0.0) rotation about the X axis 
(usually 0.0) negative pixel Y size X coordinate of upper left pixel center Y 
coordinate of upper left pixel center
You can construct that file simply by using your favorite text editor.
World file usually has suffix .wld, but sometimes it may has .tfw, tifw, .jgw 
or other suffixes depending on the image file it comes with.” Therefore, 
nothing should have changed in QGIS and the old extensions should be good.



Are the files in same directory as your world files? Have your files and 
project been moved?  Maybe your project are still pointing towards an other set 
of files that are not georeferenced?   (Place the problematic file in a 
separate directory and try loading the project again with the same errors or 
look at the paths in the project file using notepad++.)

Try creating a world file by exporting a project to a tiff. (A world file will 
be created) Is the format the same?  Should be.

Did your files change names?  Have they been capitalized? (Names need to be the 
same). Place the raster in a separate directory and try to read any possible 
geotag that could override the world files.  Use gdal info for that.

Good luck

Nicolas


> Le 3 avr. 2019 à 02:43, Christine  a écrit :
> 
> QGIS understands *.jgw, *.tfw and *.wld. Never had a problem with that
> before. 
> As I remember, newer ArcGIS ignore these worldfiles, if an ESRI specific
> file is present (.aux or so). So maybe the worldfiles are the problem - what
> doesn't matter in ArcGIS, but in QGIS. 
> 
> Regards, Christine
> 
> 
> 
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Re: [Qgis-user] NTV2 Grid Shits

[TYlerVeinot]

I have no need to transform from ATS77 to NAD27 but it sounds like a good
idea if one had to. I have 2 GSB Files PE7783V2.gsb from the GeoCalc
Software designed by GeoNB for PEI to transform from ATS77 to NAD83 and
NTv2.gsb which is a national gsb for going from NAD27 to NAD83. I came back
to this post because after installing QGIS3 and removing QGIS2 I lost all my
old custom CRS's that were tied into using those GSB's to transform
coordinates, and they seemed to work because the coordinates were slightly
different than if I did not have the +XYZ.gsb in the PROJ4.
I am trying to add my new gsb files directly to the srs database so that
they come up as transformation options in QGIS3. I added them to the
database table but they do not come up as options in the CRS screen. Has
anyone tried adding it directly?



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Re: [Qgis-user] Using python on qgis Forms

[Raymond Nijssen]

Hi Kyle!

The python code to get all the id's looks like this:

ids = []
for feat in iface.activeLayer().getFeatures():
ids.append(feat.id())
print(ids)


Now you need to connect your button to a function containing the above 
code, something like:


pushButtonShowIds.clicked.connect(getAllIds)



Please have a look at the python cookbook for code snippets:

https://docs.qgis.org/2.18/en/docs/pyqgis_developer_cookbook/index.html


Good luck!
Raymond



On 02-04-19 19:14, Kyle Felipe Vieira Roberto wrote:

Hi!
im from Brazil!
I made a form, using QT4 (here we r using qgis 2.18 yet), on this form, 
i put a button that must take all "id" from selected features in a 
selected Layer.

How to do it???

_*Kyle Felipe*_
Vida longa e próspera!
May the forçe be with you...
#ThinkFree
www.kylefelipe.com 
www.flickr.com/kylefelipe 
https://gitlab.com/kylefelipe
https://github.com/kylefelipe

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[Qgis-user] Mapped Network Drives dropped in QGIS

[Tyler Veinot]

Hi All;
I have a lot of data on a server so I have a number of networked drives
assigned to drive letters (these don't change). However everytime I open
QGIS I have to go and remap all my drives before opening any projects
otherwise I get the handle bad layers dialog every time. I am wondering if
this is a bug, a glitch, or something I have setup wrong.
It seems to only be an issue in QGIS 3.4.6 QGIS 3.6.X seems to not do this.
Tyler
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[QGIS-it-user] DataPlotly e grafici multipli

[pierluigi de rosa]

Cari utenti,

sto utilizzando con soddisfazione il plugin DataPlotly di Matteo Ghetta,
Creo dei grafici multipli sovrapposti verticalmente. Ho però necessità di
fare uno zoom su una porzione di asse delle ascisse.
Mi piacerebbe che i grafici fossero tra loro collegati, ovvero zommando il
primo anche gli altri adeguino i dati in ascisse a quelli zommati sul primo.
E' possibile questo in modo semplice?

Grazie
Pierluigi

-- 
Ing. Pierluigi De Rosa (PhD in Earth Science)
Contract Professor of Geographic Information System at University of Perugia
cel: 3497558268 / fax: 075 7823038
skype: pierluigi.derosa
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Re: [Qgis-user] locating layer

[DelazJ]

Hi Mike,

You don't need to look for it or display it; it's there by default: the
status bar is the bar at the bottom of the QGIS dialog, showing coordinate
box, scale, magnifier... point 5 of the outdated screenshot at
https://docs.qgis.org/testing/en/docs/user_manual/introduction/qgis_gui.html#qgis-gui
At its left side (not visible on the screenshot since it's from 2.x and not
up to date), there's a textbox with a magnifier and  "Type to locate
(Ctrl+K)" text within.
Just type in *l layername* or simply the layer name and you should get what
you want.
See also
https://qgis.org/en/site/forusers/visualchangelog30/index.html#feature-locator-bar

Harrissou

Le mer. 3 avr. 2019 à 04:12, Mike Flannigan  a écrit :

>
> The Status Bar may help me too, but I can't figure
> out how to find it, display it, or turn it on.
>
> Windows ver 3.2.0.
>
> I want a way to text search the 60+ layers I have
> in some of my projects.
>
>
> Mike
>
>
>
> On 4/1/2019 2:00 PM, qgis-user-requ...@lists.osgeo.org wrote:
> > Hi,
> > I'm neither sure I understand what you want to do but you can give a look
> > to the locator bar from the status bar (
> >
> https://docs.qgis.org/testing/en/docs/user_manual/introduction/qgis_gui.html#status-bar
> ).
> > It helps you find a layer in the layers panel or find features (using the
> > appropriate field.
> >
> > HTH,
> > Harrissou
>
>
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Re: [QGIS-it-user] Filtro layer geometrico e selezione per localizzazione spaziale

[Martina Savarese]

Però potrsti crearti un nuovo campo con la funzione aggregate che soddisfi
la condizione di appartenenza al layer poligonali AND quella di un dato
valore del campo voluto per poi filtrare sul nuovo campo che ti sei creato
Martina


Il giorno Mar 2 Apr 2019 22:26 Luca Bellani <
lucabellani.arqueolo...@gmail.com> ha scritto:

> Non fa una grinza. Grazie mille!!
>
>
>
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Re: [Qgis-user] Bringing georeferenced rasters into QGIS

[Christine]

QGIS understands *.jgw, *.tfw and *.wld. Never had a problem with that
before. 
As I remember, newer ArcGIS ignore these worldfiles, if an ESRI specific
file is present (.aux or so). So maybe the worldfiles are the problem - what
doesn't matter in ArcGIS, but in QGIS. 

Regards, Christine



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Re: [Qgis-user] Bringing georeferenced rasters into QGIS

[Stefan Giese]

you should rename the world files to .wld and try it again.

best regards

stefan

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Am 03.04.2019 um 08:29 schrieb j...@jmcgeo.com:


Hi, first post here.  I am migrating an old project to QGIS to see how 
it handles my day to day work and have hit a snag.


QGIS doesn’t seem to recognise my world files.  Generally these follow 
the following filename convention:


XXX.jpg -à XXX.jgw

XXX.tif -à XXX.tfw

I have tried creating a file XXX.wld and the georeferencing tool 
cautions me that it is there and overwrites it, but when I put the old 
data back in it, it still pays no attention.  The XXX.yzW files were 
created in the ArcGIS georeferencing tool and work fine in ArcGIS and 
Mapinfo.


Thanks in advance.


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[Qgis-user] Bringing georeferenced rasters into QGIS

[jmc]

Hi, first post here.  I am migrating an old project to QGIS to see how it
handles my day to day work and have hit a snag.

 

QGIS doesn't seem to recognise my world files.  Generally these follow the
following filename convention:

XXX.jpg ---> XXX.jgw

XXX.tif ---> XXX.tfw

 

I have tried creating a file XXX.wld and the georeferencing tool cautions me
that it is there and overwrites it, but when I put the old data back in it,
it still pays no attention.  The XXX.yzW files were created in the ArcGIS
georeferencing tool and work fine in ArcGIS and Mapinfo.

 

Thanks in advance.

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