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Europe DEM file on a Garmin Nuvii 3598LMTD
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lillyelse
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Joined: Aug 03, 2007
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Location: Derby

PostPosted: Mon Sep 12, 2016 12:10 am    Post subject: Europe DEM file on a Garmin Nuvii 3598LMTD Reply with quote

Anyone know what the Europe DEM file does?

The latest map update to 2017-20 appears to have deleted it because it no longer announces itself in "My Maps", where there was 3 entries; CN Europe NTU 2017.10, CN Europe NTU 2017.10 3D, and Europe DEM before the update from 2017.10 to 2017.20.

All four files exist on the microSD card but only "Europe DEM" is missing from "My Maps" display.

Now, after the update, only two entries are visible, NTU Europe 2017.20 and NTU 2017.20 3D.

Otherwise everytning works as normal, even 3D buildings.

Thanks in advance
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Kremmen
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PostPosted: Mon Sep 12, 2016 6:30 am    Post subject: Reply with quote

My 2599 is showing:

CN Europe NTU
2017.20 Foursquare

CN Europe NTU
2017.20 ALL
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sussamb
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PostPosted: Mon Sep 12, 2016 6:39 am    Post subject: Reply with quote

The DEM file is the digital elevation model that shows the terrain, it's only used by certain models, the 3598 is one.

MapUpdater is known to occasionally delete this file. You can either restore it from a backup (if you have one) or run Express which normally copes with the DEM map.

Note also the file may be there but named incorrectly. It needs to be named gmapdem.img so if it's named something else rename it.
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M8TJT
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PostPosted: Mon Sep 12, 2016 8:38 am    Post subject: Reply with quote

Where is the DEM file supposed to be located suss
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sussamb
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PostPosted: Mon Sep 12, 2016 9:06 am    Post subject: Reply with quote

Would normally be in the .system folder along with the map files. On the SD card it would be the Garmin folder.
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lillyelse
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PostPosted: Mon Sep 12, 2016 1:14 pm    Post subject: Europe DEM file Nuvii 3598LMTD Reply with quote

Many, many thanks for all the very helpful advice and coments, particularly to sussamb.

One final question if I may. What is the file name of the DEM file if it isn't already named "gmapdem.img"? I know there is a "gmap.img" file which is the main map.

Is this DEM file updated with each map update or is it similsr to a "base map" that is not updated regularly please?
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sussamb
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PostPosted: Mon Sep 12, 2016 2:11 pm    Post subject: Reply with quote

The DEM file doesn't change much, if at all. You should be able to identify it as it will be smaller than the EU file or larger than the UK one, depending which one you have. In the past when this has occurred it's been named sonthing like DxxxxxB.img where the xxxxx is some number.
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lillyelse
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PostPosted: Mon Sep 12, 2016 6:34 pm    Post subject: Europe DEM file Garmin 3598LMTD Reply with quote

Thank you again ssumb. I've found a device backup that has the file os I'm OK now.

Looks like this particular unit has been exposed to Apple's file system at some stage in the past as I've found a lot of strange apple file attributes that dont make sense so I've removed them. However I'm concerned that there may be a lot of hidden files using up precious megabytes that I don't know how to get rid of as yet. Any suggestions?

Cheers.
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CDK
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PostPosted: Mon Sep 12, 2016 6:52 pm    Post subject: Re: Europe DEM file on a Garmin Nuvii 3598LMTD Reply with quote

lillyelse wrote:
Anyone know what the Europe DEM file does?
Now, after the update, only two entries are visible, NTU Europe 2017.20 and NTU 2017.20 3D.
Otherwise everytning works as normal, even 3D buildings.
Thanks in advance

I have the same situation as above.
The DEM file is missing after the update. Also missing from the SD card.

Checked my 3598 and followed sussumb's advice.
Also reinstalled the maps by GE, but no change.

Any thoughts?

Regards Sad
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Kremmen
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PostPosted: Mon Sep 12, 2016 7:14 pm    Post subject: Reply with quote

My 2597 and 2599 don't have the 3D file (obviously as 3D isn't supported)

Is this 3D file old or new for this update. Have Garmin replaced the DEM file with this 3D file hence the DEM removal ?
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sussamb
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PostPosted: Mon Sep 12, 2016 7:27 pm    Post subject: Re: Europe DEM file Garmin 3598LMTD Reply with quote

lillyelse wrote:
Thank you again ssumb. I've found a device backup that has the file os I'm OK now.

Looks like this particular unit has been exposed to Apple's file system at some stage in the past as I've found a lot of strange apple file attributes that dont make sense so I've removed them. However I'm concerned that there may be a lot of hidden files using up precious megabytes that I don't know how to get rid of as yet. Any suggestions?

Cheers.


If you're using a Mac check the trash, that should be emptied.
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sussamb
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PostPosted: Mon Sep 12, 2016 7:29 pm    Post subject: Reply with quote

Kremmen wrote:
My 2597 and 2599 don't have the 3D file (obviously as 3D isn't supported)

Is this 3D file old or new for this update. Have Garmin replaced the DEM file with this 3D file hence the DEM removal ?


No, the 3D file is the one that produces the 3D buildings, the DEM file produces the terrain.
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sussamb
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PostPosted: Mon Sep 12, 2016 7:31 pm    Post subject: Re: Europe DEM file on a Garmin Nuvii 3598LMTD Reply with quote

CDK wrote:
lillyelse wrote:
Anyone know what the Europe DEM file does?
Now, after the update, only two entries are visible, NTU Europe 2017.20 and NTU 2017.20 3D.
Otherwise everytning works as normal, even 3D buildings.
Thanks in advance

I have the same situation as above.
The DEM file is missing after the update. Also missing from the SD card.

Checked my 3598 and followed sussumb's advice.
Also reinstalled the maps by GE, but no change.

Any thoughts?

Regards Sad


Did you ever make a backup? You should be able to copy the DEM file from a back up.
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MichaelCahill
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PostPosted: Tue Sep 13, 2016 12:59 am    Post subject: Reply with quote

THe DEM file seems to have disappeared from my 3590 following the recent update and I don't seem to have backed it up previously.

I have a folder named D166000 on my Garmin but it seems to be contain .glx files. Assuming that this is not the file mentioned, where can I get a copy of the DEM file to put back on my device? I ran GE but it didn't give an option of downloading such a file.
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lillyelse
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Location: Derby

PostPosted: Tue Sep 13, 2016 1:07 am    Post subject: Europe Dem file for Nuvii 3598 LMTD Reply with quote

Once again, thank you to all helpful members. I have now restored the Europe DEM file on my devices from a backup I did in 2015. The file is "gmapdem.img" and is 310,392Kb in size, dated 15 June 2015, so would travel well within an email.

I'll wrap it up in a folder and email to interested 3598 owners if they get in touch. There is an accompanying "gmapdem.sum file", but I dont think it will be needed.

Must stress that although I've got the DEM file installed in the .system folder I haven't yet tried it out with this Full Europe 2017.20 map update. Will do that this comming weekend.

Looks as though Garmin have tweaked the 3D bit of the mapping, maybe to eliminate the Europe DEM file but time will tell.

Cheers.
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