Re: [Qgis-user] Shape file to xyz where z is label
Stefan, It looks at though this generates a shape file of the centroids (pink dots below). [image: Inline images 1] What I was after was an xyz file of the data where z is lithology so that I can fill the shapefile polygons with a lithology colour/pattern in my software. Chas On 19 January 2018 at 14:56, Stefan Giese (WhereGroup) < stefan.gi...@wheregroup.com> wrote: > Hi Chas, > you can use Vector-Menu->Geometry Tools->Polygon centroids > which will produce a pointlayer with all attributes. There you will find > your label as one column like in the geology layer. > > best > stefan > > --- > Mit freundlichen Grüßen > Stefan Giese > Projektleiter/Consultant > > Das WhereGroup-Team wünscht Ihnen ein frohes > Weihnachtsfest und ein glückliches Jahr 2018! > > Die Termine der FOSS Academy für 2018 sind online! > Alle Infos unter www.foss-academy.com > > > WhereGroup GmbH & Co. KG > Schwimmbadstr. 2 > 79100 Freiburg > Germany > > Fon: +49 (0)761 / 519 102 - 61 > Fax: +49 (0)761 / 519 102 - 11 > > stefan.gi...@wheregroup.com > www.wheregroup.com > Amtsgericht Bonn, HRA 6788 > --- > Komplementärin: > WhereGroup Verwaltungs GmbH > vertreten durch: > Olaf Knopp, Peter Stamm > --- > > Am 2018-01-19 06:07, schrieb Chas Sheen: > >> I have a shape file of geology where the label represents lithology. >> Is there a way to export xyz where z is the label. >> Then I could display result in other software. >> ___ >> 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 >> > ___ 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
[Qgis-user] Shape file to xyz where z is label
[image: Inline images 1] I have a shape file of geology where the label represents lithology. Is there a way to export xyz where z is the label. Then I could display result in other software. ___ 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
Re: [Qgis-user] Qgis-user Digest, Vol 143, Issue 27
Thanks- problem solved. Chas Sheeb On 17 January 2018 at 22:43, <qgis-user-requ...@lists.osgeo.org> wrote: > Send Qgis-user mailing list submissions to > qgis-user@lists.osgeo.org > > To subscribe or unsubscribe via the World Wide Web, visit > https://lists.osgeo.org/mailman/listinfo/qgis-user > or, via email, send a message with subject or body 'help' to > qgis-user-requ...@lists.osgeo.org > > You can reach the person managing the list at > qgis-user-ow...@lists.osgeo.org > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of Qgis-user digest..." > > Today's Topics: > >1. Re: Generating black white from RGB landsat using Raster Map > calculator? (Michel Stuyts) > > > -- Forwarded message -- > From: Michel Stuyts <michel.stu...@edegem.be> > To: "qgis-user@lists.osgeo.org" <qgis-user@lists.osgeo.org> > Cc: > Bcc: > Date: Wed, 17 Jan 2018 14:33:03 + > Subject: Re: [Qgis-user] Generating black white from RGB landsat using > Raster Map calculator? > > Chas, > > > > If I have a color GEOTIFF and I want to show or save it as a grayscale > GEOTIFF, I use one of these 2 solutions. Depending on the control you want > on the color to grayscale conversion it might also be a solution for you. > > > > > > Solution 1: > > If the only thing you want to do is show a colour geotiff in grayscale, > you can just change the properties of the layer. In the layer properties > you go to the tab “Style”. Under “Color rendering” you will find the option > “Grayscale”. By default the option will be set to “Off”, but you can change > it to turn grayscale on. Try one of the three options to see what fits your > image best. After that you can also change the values of “Brightness” or > “Contrast” to get the best result. > > > > This way you won’t change anything in your source file and it won’t save a > grayscale tiff, but it will just show your raster file as grayscale in QGIS. > > > > Solution 2: > > If you want to end up with a geotiff file that has the same information in > grayscale I usually use some graphical software in the process, but for > that you can’t use a GeoTiff, because you would loose the georeference > information of the file. Therefore I use the following steps: > > 1. Save your geotiff file as TIFF-file with a TFW file: > > a. Right click on your source geotiff file in the layers panel. > > b. Select Save As… > > c. Select Rendered image as Output Mode > > d. Select Gtiff as format > > e. Deselect “Add saved file to map” > > f.Under “Create Options” click on the + button to add an option. > For the newly added option you have to type TFW as “Name” and YES as > “Value” (double click in the newly created Option cell to type in it). > > g. Click on the “Browse…” button to select a name and location for > your grayscale TIFF file. > > h. Click on the “OK” button > > 2. Open the newly created TIFF file in graphical software like > XnView, IrfanView or GIMP. Change the image in that software to grayscale > and save the file. > > 3. Add the newly created TIFF file back to QGIS > > 4. Save your newly created TIFF file as a GeoTIFF file: > > a. Right click on your newly created TIFF file in the layers panel. > > b. Select Save As… > > c. Select Rendered image as Output Mode > > d. Select Gtiff as format > > e. Click on the “Browse…” button to select a name and location for > your grayscale GEOTIFF file. > > f.Click on the “OK” button > > > > Michel > > > > > > > > > > *Van:* Qgis-user [mailto:qgis-user-boun...@lists.osgeo.org] *Namens *Chas > Sheen > *Verzonden:* woensdag 17 januari 2018 14:33 > *Aan:* 'Micha Silver' <tsvi...@gmail.com>; qgis-user@lists.osgeo.org > *Onderwerp:* Re: [Qgis-user] Generating black white from RGB landsat > using Raster Map calculator? > > > > Mike, > > So everything in the capture below of the Raster calculator should work? I > cannot find any output. > > I’m in Perth, Australia so home now and away from the office and QGIS, but > would like to get it working tomorrow. > > How do apply a grayscale to a raster? As I said, I’m new to QGIS > > Chas Sheen > > > > *From:* Micha Silver [mailto:tsvi...@gmail.com] > *Sent:* Wednesday, January 17, 2018 8:39 PM > *To:* Chas Sheen <chassheen...@gmail.com>; qgis-user@lists.osgeo.org > *Subject:* Re: [Qgis-user] Generating black white from RGB landsat u
Re: [Qgis-user] Generating black white from RGB landsat using Raster Map calculator?
Mike, So everything in the capture below of the Raster calculator should work? I cannot find any output. I’m in Perth, Australia so home now and away from the office and QGIS, but would like to get it working tomorrow. How do apply a grayscale to a raster? As I said, I’m new to QGIS Chas Sheen From: Micha Silver [mailto:tsvi...@gmail.com] Sent: Wednesday, January 17, 2018 8:39 PM To: Chas Sheen <chassheen...@gmail.com>; qgis-user@lists.osgeo.org Subject: Re: [Qgis-user] Generating black white from RGB landsat using Raster Map calculator? Hello Chas On 01/17/2018 01:52 PM, Chas Sheen wrote: Richard, I should have made my initial query clearer. I am trying to output a black and white geotiff. It's still not clear what you are asking. AFAIK, there's no such thing as a "black and white geotiff". You can apply any color table you want to any raster. You can apply a gray scale to any of the landsat bands. If you are trying to create a new raster from the three RGB bands using some expression, that should work. You can use either of three tools: the built in QGIS raster calculator, or thru the Processing toolbox there's SAGA Raster calculus and the GRASS module r.mapcalculator. Again, none of this has anything to do with coloring. After running the raster calculator, you can color the result with a gray scale color table, a red color table, or any other color ramp you choose. Have split the original (landsat) image into RGB images. When I apply the expression in the capture below, and hit run, nothing is saved to the results directory. I’m assuming that my expression or something else in the raster calculator is wrong? The final product that I’m after is a xyz grid where z is the black-white amplitude…which I think should be relatively easy (?) once I have the black-white image. After you running the calculator expression, then you can save the result in many formats, including gridded XYZ, ArcINFO ASCII, or many others, using the gdal_translate tool. This is under the Raster->Conversion menu. Chas Sheen 0448017282 From: Richard McDonnell [mailto:richard.mcdonn...@opw.ie] Sent: Wednesday, January 17, 2018 7:13 PM To: Chas Sheen <mailto:chassheen...@gmail.com> <chassheen...@gmail.com>; qgis-user@lists.osgeo.org <mailto:qgis-user@lists.osgeo.org> Subject: Re: [Qgis-user] Generating black white from RGB landsat using Raster Map calculator? Chas, Two options for splitting RGB into separate images in QGIS. 1. Semi-Automatic Classification Plugin, Preprocessing, Split Raster Bands 2. Grass r-rgb (Processing Toolbox) Any one of these tools will split the Raster for you easy enough Regards, Richard On 17/01/2018 00:48, Chas Sheen wrote: I split the image into R, G, B Worked out in QGIS wher the Raster map calculator is. Run...several times No result foud in Results Directory. It runs quickly then refreshes inputs and logs to blanks. I'm new to QGISso have probably left out something basic. Any clues ___ Qgis-user mailing list Qgis-user@lists.osgeo.org <mailto:Qgis-user@lists.osgeo.org> List info: https://lists.osgeo.org/mailman/listinfo/qgis-user Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user -- Richard McDonnell GIS Specialist PgD GIS AssocSCSI OPW FRM Data Management 52 Stephens Green, Dublin 2. TEL: 01 6476543 <http://www.opw.ie/> Email Disclaimer: http://www.opw.ie/en/disclaimer/ ___ Qgis-user mailing list Qgis-user@lists.osgeo.org <mailto:Qgis-user@lists.osgeo.org> List info: https://lists.osgeo.org/mailman/listinfo/qgis-user Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user -- Micha Silver Ben Gurion Univ. Sde Boker, Remote Sensing Lab cell: +972-523-665918 ___ 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
Re: [Qgis-user] Generating black white from RGB landsat using Raster Map calculator?
Richard, I should have made my initial query clearer. I am trying to output a black and white geotiff. Have split the original (landsat) image into RGB images. When I apply the expression in the capture below, and hit run, nothing is saved to the results directory. I’m assuming that my expression or something else in the raster calculator is wrong? The final product that I’m after is a xyz grid where z is the black-white amplitude…which I think should be relatively easy (?) once I have the black-white image. Chas Sheen 0448017282 From: Richard McDonnell [mailto:richard.mcdonn...@opw.ie] Sent: Wednesday, January 17, 2018 7:13 PM To: Chas Sheen <chassheen...@gmail.com>; qgis-user@lists.osgeo.org Subject: Re: [Qgis-user] Generating black white from RGB landsat using Raster Map calculator? Chas, Two options for splitting RGB into separate images in QGIS. 1. Semi-Automatic Classification Plugin, Preprocessing, Split Raster Bands 2. Grass r-rgb (Processing Toolbox) Any one of these tools will split the Raster for you easy enough Regards, Richard On 17/01/2018 00:48, Chas Sheen wrote: I split the image into R, G, B Worked out in QGIS wher the Raster map calculator is. Run...several times No result foud in Results Directory. It runs quickly then refreshes inputs and logs to blanks. I'm new to QGISso have probably left out something basic. Any clues ___ Qgis-user mailing list Qgis-user@lists.osgeo.org <mailto:Qgis-user@lists.osgeo.org> List info: https://lists.osgeo.org/mailman/listinfo/qgis-user Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user -- Richard McDonnell GIS Specialist PgD GIS AssocSCSI OPW FRM Data Management 52 Stephens Green, Dublin 2. TEL: 01 6476543 <http://www.opw.ie/> Email Disclaimer: http://www.opw.ie/en/disclaimer/ ___ 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
[Qgis-user] Generating black white from RGB landsat using Raster Map calculator?
I split the image into R, G, B Worked out in QGIS wher the Raster map calculator is. Run...several times No result foud in Results Directory. It runs quickly then refreshes inputs and logs to blanks. I'm new to QGISso have probably left out something basic. Any clues [image: Displaying image.png] ___ 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
