3 Second DEM Datasets now available

Map Monkey · Post by **Map Monkey** » 01 August 04 9:06 pm

lucky broadband bastards........

BTW what's the total size for all files unzipped for curiosity sake

AGSMKY

Dooghan · Post by **Dooghan** » 01 August 04 11:26 pm

agsmky wrote:lucky broadband bastards........

BTW what's the total size for all files unzipped for curiosity sake

AGSMKY

About 2.88Gig unzipped

Dooghan

Team Piggy · Post by **Team Piggy** » 02 August 04 5:12 pm

I only downloaded all of Aust, file size was about 860 meg.

Took 22 mins for curiousity's sake of the non broadband users.

I love Broadband

Dooghan · Post by **Dooghan** » 02 August 04 8:08 pm

Team Piggy wrote:I only downloaded all of Aust, file size was about 860 meg.

Took 22 mins for curiousity's sake of the non broadband users.

I love Broadband

.........and 20 min to do a mass unzip

Webguy · Post by **Webguy** » 02 August 04 8:16 pm

OK, thanks, I got the right data, and am now making bumpy maps. Damn, the area around katoomba looks pretty bad, I guess it comes down to the data. Does 1 second data exist?

Really, at the moment, it's a novelty factor. Seeing more detailed data in action would be nice.

Map Monkey · Post by **Map Monkey** » 03 August 04 1:53 pm

Anything exists for the right price

There is a small amount data missing around katoomba, however this would due to the number of cliffs......all data missing seems to be on the cliff edges. When changing 500m in altitude over 90m (3 seconds) you can't blame NASA for missing data

There are several (free) programs which can fill in these voids of data including SRTMfill at http://www.3dnature.com/srtmfill.html

Remember Ozi3D interpolates between elevation data, therefore will smooth the terrain, rather than show vertical drops. (BTW Cliffs will never be shown as cliffs

)

Hope this helps

AGSMKY

EcoTeam · Post by **EcoTeam** » 03 August 04 2:13 pm

Webguy wrote:OK, thanks, I got the right data, and am now making bumpy maps. Damn, the area around katoomba looks pretty bad, I guess it comes down to the data. Does 1 second data exist?

Really, at the moment, it's a novelty factor. Seeing more detailed data in action would be nice.

Any good at all for general canyons maps Neil?
If not then I won't bother trying until I can get some better data.
At 90m intervals you'd only get 5 points for a canyon like Claustral

In theory it wouldn't be too hard to write a program that took a topo image and as you clicked on the contour lines it generated the appropriate data. Allthough knowing my luck if I wrote such a thing, the very next day everyone would have access to sub 1 second data!

EcoDave

Webguy · Post by **Webguy** » 03 August 04 2:30 pm

I played with it last night, no, not that! Ozi3D

I found that it did a better job on less mountainous countryside, and I thought it looked better without the toppo textured onto it as well. I did some around gleen brook, katoomba, lithgow and dubbo as well as sydney harbour. Interesting, it was showing peaks under the water which was pretty cool.

You would not see a canyon really at all, I did around claustral, and all it was, was rolling hills, bigish ones, but still, nothing to suggest that something like claustral was hiding in there.

1 second data would be interesting to play with, but, again, more for the novelty factor.

Map Monkey · Post by **Map Monkey** » 03 August 04 6:01 pm

Hi Pesky!,

Ozi3D seems to load the best resolution data therefore even though you do not necessarily need to turn off the 9 second data, it helps with sanity checking

My steps generally include:

Go to "3D/Elevation" menu
Select "Elevation Configuration"
Select "DEM File Paths" tab
Unselect all "Active" checkboxes except for Globe (Arcview)
Hit "save"

Now....

Load a small scale map (>1:250000, I use a 1:1million SF55)
Make sure "show elevation display" is on (under 3D/Elevation)
Zoom to show the whole map

When mousing over you should see when an area has data and when it doesn't (???? shown on elevation display)

Regards

AGSMKY

riblit · Post by **riblit** » 03 August 04 7:15 pm

EcoTeam wrote:
Webguy wrote:OK, thanks, I got the right data, and am now making bumpy maps. Damn, the area around katoomba looks pretty bad, I guess it comes down to the data. Does 1 second data exist?

Really, at the moment, it's a novelty factor. Seeing more detailed data in action would be nice.
Any good at all for general canyons maps Neil?
If not then I won't bother trying until I can get some better data.
At 90m intervals you'd only get 5 points for a canyon like Claustral

In theory it wouldn't be too hard to write a program that took a topo image and as you clicked on the contour lines it generated the appropriate data. Allthough knowing my luck if I wrote such a thing, the very next day everyone would have access to sub 1 second data!

EcoDave

There is a program that makes a DEM file from your tracklog.
Check the oziexplorer web site..