[Qgis-user] Exporting Raster layer to text file

[David Reid]

Thanks Matt + other respondents to my question.

 

I should have been more specific  -  The raster image/data I am trying to export is a DEM which I would like to transfer to a 3D modelling system.

 

Using the raster/conversion/translate menu I have managed to get most of the way, using the ASCII gridded XYZ format output.  This produces a text file with XY coordinates and the elevation Z.    

 

BUT I would like the X and Y in planar grid coordinates (metres).  I have selected a plane grid projection as the “target SRS”  but it still produces X and Y as lat/long coordinates.

 

Any suggestions about what I am doing wrong?

 

Cheers

 

David Reid

 

 

 

 

 

 

 

From: Matt Boyd [mailto:mattslists at gmail.com] 
Sent: Friday, 15 September 2017 3:28 PM
To: David Reid <davidreid6363 at gmail.com>
Cc: qgis-user <qgis-user at lists.osgeo.org>
Subject: Re: [Qgis-user] Exporting Raster layer to text file

 

David,

also you may find that even though you select a different format it only saves as a tiff. If you look at the box that states the command line gdaltranslate is using, the -o flag is the output format. You can check the box next to the command line and change that manually if it doesn't change to tiff automatically. Think it's a bug. the output format options can be googled "-o zmap" works.  

 

On Fri, Sep 15, 2017 at 5:24 PM, Matt Boyd <mattslists at gmail.com <mailto:mattslists at gmail.com> > wrote:

Hi David,

rasters come in a few different flavours.

RGB/greyscale photographic type images such as an aerial photograph or a georeferenced scan of a map are one. There's not a lot of point exporting those as text. 

 

There are also Raster images where the RGB / black bands represent a frequency or attribute from a satellite or remote sensing instrument, you might want to convert those to a different format to use in a different package or just select a single band to work on.

 

Single band raster such as grids or DEMS are another type of raster.

 

The last 2 types above can be saved in alternate formats under the "convert format" option in the raster dropdown options somewhere, can't remember the exact name.

 

I usually do this with grids / single band rasters. the command line option is gdaltranslate. "save as" doesn't work the same way it does as with vector data.

 

I don't have QGIS open at the so I can't recommend a format but I think CSV is one of them.

 

Good luck

Matt 

 

 

On Wed, Sep 13, 2017 at 3:45 PM, David Reid <davidreid6363 at gmail.com <mailto:davidreid6363 at gmail.com> > wrote:

Hello qgis users,

 

I am very new to qgis and would like information on how to export raster data as a text file.

 

Cheers

 

David Reid

 

 

 

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