[Qgis-user] USGS 3DEM question: export to kml/kmz

[John W. Blue]

Thanks for the file composition info.

Using that I was able to convert the downloaded 3DEM .tif from a raster to vector using Raster > Conversion > Polygonize (Raster to Vector) option.  The resultant exported .kml file size was almost 1 Gb and while Google earth was to load it, it was nothing but a white square.

I did find that Raster > Analysis > Hillshade was able to produce some remarkable and useable results.  What is strange is that the conversion of the hillshade raster to vector .kml never completes.  It quickly gets to 7% and then seemly stalls out.

Am I not waiting long enough?

John



From: oisin.kelly.wild at gmail.com [mailto:oisin.kelly.wild at gmail.com] 
Sent: Tuesday, November 12, 2024 3:01 PM
To: John W. Blue
Cc: qgis-user at lists.osgeo.org
Subject: Re: [Qgis-user] USGS 3DEM question: export to kml/kmz

The tif file is a raster. 
Kml is a vector format.
You need to use one of the processing tools to extract contours or spot heights and then export the results to kml.
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On 12 Nov 2024, at 20:06, "John W. Blue via QGIS-User" <qgis-user at lists.osgeo.org> wrote:
Hello,
 
QGIS newbie here.  I want to use USGS LiDAR to search for abandoned railroad grades as a layer in Google Earth.
 
I am able to download the 1 meter tif from USGS and I am able to add it as a layer in QGIS.  I cannot, however, figure out how export the layer as a kml/kmz file.
 
I right-click on the layer and choose “Export” and then “Save As” followed by dropping the “Format” menu down.  Heaps and heaps of options to choose from but none for kml/kmz.
 
Any help in what I am missing or doing wrong would be appreciated.
 
John 
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