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

[Bernie Connors]

John,

That looks like a great tutorial for what you want to do with digitizing
old railways.

Bernie.

On Fri, Nov 15, 2024, 1:10 a.m. John W. Blue via QGIS-User <
qgis-user at lists.osgeo.org> wrote:

> Bernie,
>
> Thank you for the suggestion.
>
> As I was checking out the plugins I did see "Quick Maps" and thought of
> the same workflow but have not tried it yet.  My only hesitation at the
> time was wanting to be able to mark the old roadbed as trail.  With some
> more google searching today I found:
>
> https://ultrajourneys.org/digitizing-trails-in-qgis/
>
> Have not attempted to follow the tutorial so if you know of a better one
> all ears.  Marking an old roadbed as a trail and getting that trail into a
> GPX format is the ultimate goal here.
>
> Thanks!
>
> John
>
>
> From: Bernie Connors [mailto:bernie.connors at unb.ca]
> Sent: Wednesday, November 13, 2024 9:03 PM
> To: John W. Blue
> Cc: qgis-user at lists.osgeo.org
> Subject: Re: [Qgis-user] USGS 3DEM question: export to kml/kmz
>
> Here is a suggestion. Keep the USGS DEM tif in QGIS and symbolize it as a
> hillshade.  It will be very easy to spot abandoned railways in the
> hillshade.  Then use the Quick Maps plugin to add the Google Satellite map
> to QGIS.  You can easily switch back and forth between Google Satellite
> layer and the USGS DEM hillshade.
>
> Cheers,
> Bernie.
> On Wed, Nov 13, 2024, 10:11 p.m. John W. Blue via QGIS-User <
> qgis-user at lists.osgeo.org> wrote:
> 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.
> Get BlueMail for Android
> 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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