Topic: (C3D '09) Surface from DEM

[Mark]

I'm creating a surface from a dem file, so far so good, the dem is in UTM83-17M, my dwg is state plane feet. When I create the surface it is not even close to where I'm working, not surprising. So how does one translate(?) this dem to another coordinate system?

thanks

[mjfarrell]

and this is where the lack of MAP functionality really bites hard.....

let me see what can be done....

you may....need to resort to all kinds of trickery...


like import the DEM into a file set to UTM.....
set the surface style to show triangles and points (as autocad nodes)
Export that data out to autocad
set up a file on your stateplane system...and then query in the data from the file you created in the steps above
let map translate the CS
THEN
from points menu create points from those autocad objects, etc, etc and build the DEM surface from that....

[Mark]

you may....need to resort to all kinds of trickery...


like import the DEM into a file set to UTM.....
set the surface style to show triangles and points (as autocad nodes)
Export that data out to autocad
set up a file on your stateplane system...and then query in the data from the file you created in the steps above
let map translate the CS
THEN
from points menu create points from those autocad objects, etc, etc and build the DEM surface from that....

That's about the best I could come up with too.

[reno]

and this is where the lack of MAP functionality really bites hard.....

let me see what can be done....

you may....need to resort to all kinds of trickery...


like import the DEM into a file set to UTM.....
set the surface style to show triangles and points (as autocad nodes)
Export that data out to autocad
set up a file on your stateplane system...and then query in the data from the file you created in the steps above
let map translate the CS
THEN
from points menu create points from those autocad objects, etc, etc and build the DEM surface from that....

Why do you need any trickery?

Assign a coordinate system to the drawing, create a surface, add the DEM, assign the appropriate coordinate system to the DEM in the options.  Done.

[Mark]

Why do you need any trickery?

Assign a coordinate system to the drawing, create a surface, add the DEM, assign the appropriate coordinate system to the DEM in the options.  Done.

Can you provide a screen shot or more info because I don't see 'options'.

thanks

[reno]

[Mark]

Thanks. I can't see the image because of our proxy server, I'll check it out when I get home.

[reno]

How about an attachment then?

[Mark]

How about an attachment then?

I can see that. But I can't change that setting. :-/

Are you using 2010?

Never mind, I see it now.

[Mark]

Well that didn't work either. It's off about 81,000 feet.

[mjfarrell]

Thanks for that Reno, I hadn't seen that option under DEMs before. 

Is it working YET there Mark?

[Mark]

Thanks for that Reno, I hadn't seen that option under DEMs before. 

Is it working YET there Mark?

Nope. (see above post)

[reno]

First thing I would do is to make sure you drawing is at the correct location.  Draw a line representing a large, easily identifiable feature, and export it to google earth.

[mjfarrell]

any solution or resolution to this one Mark?

[Mark]

any solution or resolution to this one Mark?

Yeah. Lets just say it was 'operator error' and leave it at that. The suggested solution that reno made, does indeed work. Many thanks for that!

[Mark]

But of course C3D crashes often ... with LARGE data sets. *sigh*

oh you wanted that data!!

[mjfarrell]

it is suggested that the INSTANT you get that DEM surface into a file you immediately start to use a data shortcut to it.....it may not help...however that is what THEY say should be done with 'large' data sets

[sinc]

Oh, C3D doesn't crash very often...

I just looked at my log file, and it only crashed twice for me yesterday, and eight times last week...   

[Mark]

it is suggested that the INSTANT you get that DEM surface into a file you immediately start to use a data shortcut to it.....it may not help...however that is what THEY say should be done with 'large' data sets

I'll try that. Thanks for the reminder.