Dem questions.

**MrRadio** · 20-10-10, 03:12 PM

What essentially does a Dem folder do as regards to terrain etc and does it require a sys.txt command or similar to make it work..

Does a DEM folder have to have to match exclusively to the map installed or is one DEM interchangeable between say Sensless and Navteq maps.

Where does one get the "latest" DEM for either map

The reason I ask these questions is because I have tested a couple of versions of iGO with and without the DEM folder and it doesn't seems to make a lot of difference.

I have read this forum extensively looking for these answers but have not yet found what I seek.

**bazzle01** · 20-10-10, 04:22 PM

Top - small dem
Bottom - Large dem
Mt Hotham Vic, Oz

Any mapset will used the same DEM file.
They are a contour map of the country. Not much to see around suburban areas but start to show well nearer mountains etc.
There is no real "latest: file as the land mass will only change after an Atomic bomb...
What country are you in?

Bazzle

**MrRadio** · 20-10-10, 04:35 PM

Originally Posted by bazzle01

Top - small dem
Bottom - Large dem
Mt Hotham Vic, Oz

Any mapset will used the same DEM file.
They are a contour map of the country. Not much to see around suburban areas but start to show well nearer mountains etc.
There is no real "latest: file as the land mass will only change after an Atomic bomb...
What country are you in?

Bazzle

AU

**Jards88** · 20-10-10, 07:09 PM

DEM = Digital Elevation Model. The folder does nothing it is the DEM file within it that does the work. Remember that you will only see the contour information in 3d mode and you must have the right degree of tilt to show the horizon. As you can see from Bazzle01's examples there is not a lot of difference between the DEM files, the larger one has slightly better detail but that's about it. In normal driving I doubt you would notice it.

Cheers, Ian

**bazzle01** · 20-10-10, 07:26 PM

Mr Radio

Do you have DEM files already in the Dem folder?
What size if so.

Bazzle

**MrRadio** · 20-10-10, 09:05 PM

Originally Posted by bazzle01

Mr Radio

Do you have DEM files already in the Dem folder?
What size if so.

Bazzle

Australia.dem = 38,490 KB
Oceania.dem = 1,392 KB

What has been said here makes sense then ..... not even a mole hill within cooee of here.

**bazzle01** · 21-10-10, 01:18 PM

Thats the small DEM.

If you ever find the need for larger DEM ask

Bazzle

**MrRadio** · 21-10-10, 02:23 PM

Originally Posted by bazzle01

Thats the small DEM.

If you ever find the need for larger DEM ask

Bazzle

Please sir, may I have some more?

**estimaster** · 21-10-10, 05:14 PM

I have also been trying to find
Australia.dem = 38,490 KB and Oceania.dem

I have the Australia.dem, but don't know if it is the right size?
have you got a link for those files please?

**bazzle01** · 21-10-10, 05:52 PM

Watch this space. uploading now..

Just use one only in dem folder..

Bazzle

**MrRadio** · 22-10-10, 11:12 AM

Originally Posted by bazzle01

Watch this space. uploading now..

Just use one only in dem folder..

Bazzle

Many thanks Bazzle, I'll give it a go this afternoon

**MrRadio** · 22-10-10, 03:41 PM

Just one more dem fool question .... which map is the Oceania.dem used with .. and should it even be in the folder.

**Jards88** · 22-10-10, 06:42 PM

That one is a very low resolution version covering both Australia & New Zealand. You are better off with the individual DEM files for each country.

Cheers, Ian

**xr6falcon** · 02-11-10, 09:40 PM

Thanks for the explanation guys .. I learned something today. You are great!

**tangcla** · 20-11-10, 08:33 PM

So the higher resolution the DEM file, the more it will read terrain?

What's the highest resolution version that is available?

**bazzle01** · 20-11-10, 09:20 PM

Originally Posted by tangcla

So the higher resolution the DEM file, the more it will read terrain?

What's the highest resolution version that is available?

The largest one in my linky above.

Bazzle

**chrlz** · 12-12-10, 08:53 PM

I hope this is an appropriate place to post this.. Just wondering if there is a way to adjust the terrain effect. I've looked reasonably thoroughly through the sys.txt file, and also searched, but to no avail.

The reason I ask is that.. maybe it's just my flawed memory but when I had an earlier version of IGO, I recall the terrain effects as being quite, well, dramatic, and realistic. But that GPS died a horrible wet death..

and now on a new one (8.3.4.117940 with diMka WertVRV 1.1.41) the effect *seems* much, much flatter - and yes, I'm comparing it on the same very hilly stretches of road. Maybe it's just my poor memory, or maybe I just had it zoomed in much more...?

Thanks for any tips.

**bazzle01** · 13-12-10, 01:14 PM

Originally Posted by chrlz

I hope this is an appropriate place to post this.. Just wondering if there is a way to adjust the terrain effect. I've looked reasonably thoroughly through the sys.txt file, and also searched, but to no avail.

The reason I ask is that.. maybe it's just my flawed memory but when I had an earlier version of IGO, I recall the terrain effects as being quite, well, dramatic, and realistic. But that GPS died a horrible wet death..

and now on a new one (8.3.4.117940 with diMka WertVRV 1.1.41) the effect *seems* much, much flatter - and yes, I'm comparing it on the same very hilly stretches of road. Maybe it's just my poor memory, or maybe I just had it zoomed in much more...?

Thanks for any tips.

Same road..... More ZOOM.

Bazzle

**chrlz** · 17-12-10, 09:29 PM

Originally Posted by bazzle01

Same road..... More ZOOM.

Bazzle

Yep, I think you're right, now that I've done a few more experiments... Spoke too soon - thanks!

**bazzle01** · 18-12-10, 07:11 AM

Originally Posted by chrlz

Yep, I think you're right, now that I've done a few more experiments... Spoke too soon - thanks!

You can save your setting as well. Touch screen and hold one of the 4 buttons that come up ( I use the left one for modded pages) and select save.

You can also change terrain contour colors by swapping dayheightcolormap.bmp in ui_igo8/common

Bazzle