[Qgis-user] Opening GEOTIFF file in QGIS support request

Thu Apr 27 02:16:30 PDT 2023

Hi Gino,
From the screengrab you forwarded to me, I am inclined to agree with Richard. The data appears to be looking fine. You, as Richard said should probably use background mapping to verify the location but besides that it looks fine.

I have been on the Global Wind Atlas website, and looked at some of their documentation. The data appears to be provided at a resolution of 250m (you can verify this in the properties) which is why, when zoomed in it appears pixelated. You will need to style it to make it look similar to how it's displayed online.
Also note, that on the website the data stops being displayed beyond a certain zoom level, this is to prevent issues like that you are experiencing.
I hope that clarifies things.
Regard's,

Richard

——
Richard McDonnell MSc GIS, FME Certified Professional
FRM Data Management

——
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——
Richard McDonnell MSc GIS, FME Certified Professional
FRM Data Management

——
Oifig na nOibreacha Poiblí
Office of Public Works

Sráid Jonathan Swift, Baile Átha Troim, Co na Mí, C15 NX36
Jonathan Swift Street, Trim, Co Meath, C15 NX36
——
M +353 87 688 5964   T +353 46 942 2409
https://www.opw.ie

——
To send me files larger than 30MB, please use the link below https://filetransfer.opw.ie/filedrop/richard.mcdonnell@opw.ie

Email Disclaimer: https://www.opw.ie/en/disclaimer/
> -----Original Message-----
> From: QGIS-User <qgis-user-bounces at lists.osgeo.org> On Behalf Of Richard
> Duivenvoorde via QGIS-User
> Sent: 27 April 2023 08:51
> To: ginol650 at aol.com; Qgis-user at lists.osgeo.org
> Subject: Re: [Qgis-user] Opening GEOTIFF file in QGIS support request
>
> Hi Gino (please also keep the mailing list into the loop :-) ),
>
> What I see in your screenshot looks fine?
> I see you loaded a project in EPSG:4326 (lower right corner), and you data is
> apparently also fine, as I see coordinates 32/-116 (northern Mexico, or
> southern California?).
> This is not what you supposed to see? Raster data (unlike aerials etc) are
> squares, with one or more data value's for every square. Which historically is
> shown in a white to black styling (as you can see).
> You can put the OpenStreetMap beneath it, to have more reference (and an
> idea about the size/precision of your data)?
>
> About ogrinfo.. sorry I meant gdalinfo this is a commandline too (also in the
> QGIS install of Windows), which shows information about gis-data (gdalinfo
> for rasters, ogrinfo for vector)..
>
> Or am I missing your point?
> Can you share you download url from the Wind Atlas? (I see they have a lot
> of types of data). And as asked: what were you hoping to see?
>
> Regards,
>
> Richard Duivenvoorde
>
> On 4/26/23 21:31, ginol650 at aol.com wrote:
> > Hi Richard,
> > Thank you for your reply. It looks like I’m actually able to open the file;
> however, I’m not seeing any GIS-data. Yes, it’s a GEOTIFF file. There is annual
> wind energy production sample test data in the file but after opening it in
> QGIS what I see is just the screenshot below. Could this be due to an error in
> creating the file?  For “output of ‘ogrinfo” do you mean the file name? It’s
> “gwa3_hh100m_tl10_FLH_m0_582qxe1h.tif”. This is a file download from
> Global Wind Atlas.
> > Screen Shot 2023-04-26 at 12.03.55 PM.png
> >
> > Still not quite sure what I’m doing wrong :/ Kind regards, Gino
> >
> > -----Original Message-----
> > From: Richard Duivenvoorde via QGIS-User <qgis-user at lists.osgeo.org>
> > To: qgis-user at lists.osgeo.org
> > Cc: Qgis-user at lists.osgeo.org <Qgis-user at lists.osgeo.org>
> > Sent: Tue, Apr 25, 2023 7:44 pm
> > Subject: Re: [Qgis-user] Opening GEOTIFF file in QGIS support request
> >
> > Hi GIno,
> >
> > QGIS should 'just show/open/ geotiff's fine.
> >
> > Can you open the geotiff in another viewer?
> > If not, or uncertain, are you sure it is a GEO-tiff (that is it contains the spatial
> info?) and not a 'normal tiff'?
> > If so: can you provide the output of 'ogrinfo <your.tiff>? This should show
> you info about the CRS/bbos/scale etc...
> >
> > Is the CRS (Coordinate Projection System / 'projection') of your tiff set to
> the right value (comparted to your other layers or project crs)?
> >
> > Regards,
> >
> > Richard Duienvoorde
> >
> > On 4/25/23 21:53, Gino via QGIS-User wrote:
> >  > Hello,
> >  > Good afternoon. Just wanted to send an email to request advice on
> opening a GEOTIFF file in QGIS. I'm trying to open a .tif file with QGIS;
> however, unable to view the data and not sure why. Please let me know
> best way to view this file type in QGIS.
> >  > Thank you,
> >  > Gino
> >  >
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