AutoCAD Civil 3D General Discussion

AutoCAD Civil 3D General Discussion

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Member
mfazio
Posts: 4
Registered: ‎06-20-2011
Message 1 of 12 (2,580 Views)

USGS GridFloat

2580 Views, 11 Replies
07-20-2011 11:28 AM

I am trying to import a USGS DEM.  The USGS DEMs come in two file formats: ArcGRID and GridFloat.  Does anyone know how to transform these files so they can be imported into Civil3D?  I tried SDTS2DEM and it's not working.  Is there any other program I can purchase that will translate these file formats into DEMs Civil3D can read?

*Expert Elite*
wfberry
Posts: 1,918
Registered: ‎09-05-2006
Message 2 of 12 (2,568 Views)

Re: USGS GridFloat

07-20-2011 12:27 PM in reply to: mfazio

http://www.dotsoft.com/

 

Look up Mapworks.

 

Bill

 

Member
mfazio
Posts: 4
Registered: ‎06-20-2011
Message 3 of 12 (2,566 Views)

Re: USGS GridFloat

07-20-2011 12:28 PM in reply to: mfazio

Thanks

Valued Mentor
TerryDotson
Posts: 504
Registered: ‎06-06-2010
Message 4 of 12 (2,564 Views)

Re: USGS GridFloat

07-20-2011 12:29 PM in reply to: mfazio

That should be a small .HDR file that you can drop into notepad to see something like this:

 

ncols         709
nrows         541
xllcorner     -111.82787036934
yllcorner     34.820462961916
cellsize      9.2592592599919e-005
NODATA_value  -9999
byteorder     LSBFIRST
NODATA         -9999

 

Along with a large binary .FLT file.  If this is the case (and your byteorder is LSBFIRST) then MapWorks Surfaces will convert it to an ASCII Grid that Civil3D can reference, point file, import it, etc.  If your byteorder is not LSBFIRST then we can do a quick revision.

*Expert Elite*
Murph
Posts: 2,063
Registered: ‎11-13-2006
Message 5 of 12 (2,563 Views)

Re: USGS GridFloat

07-20-2011 12:30 PM in reply to: wfberry

wfberry wrote:

http://www.dotsoft.com/

 

Look up Mapworks.

 

Bill

 


:smileyhappy:


 

Murph
Supportting the troops daily.
Valued Mentor
Hidden_Brain
Posts: 704
Registered: ‎03-24-2009
Message 6 of 12 (2,528 Views)

Re: USGS GridFloat

07-21-2011 07:45 AM in reply to: mfazio

you can download it in arcgrid format, and then use the.ADF file that is ususally named as w001....adf (the one without the "x" in its file name). if you change your folder view settings to DETAILS, this ADF file would be the last but one.

 

Avishek Chhibber, P.E., CFM
Civil 3D 2013 SP2, Win 7-64 bit
8GB RAM
Member
mfazio
Posts: 4
Registered: ‎06-20-2011
Message 7 of 12 (2,526 Views)

Re: USGS GridFloat

07-21-2011 07:55 AM in reply to: Hidden_Brain

can you import the ADF directly into Civil3D?

Valued Mentor
Hidden_Brain
Posts: 704
Registered: ‎03-24-2009
Message 8 of 12 (2,522 Views)

Re: USGS GridFloat

07-21-2011 08:12 AM in reply to: mfazio

yes, first create a new blank surface, then add DEM Files under the surface definition in prospector. you need to know what the coordinate system of the ADF file , and you should have a coordinate system set up for your drawing in which you are doing this. if your arcgrid is from usgs seamless, the vertical will be in meters, but you can landxnl out and then landxml into a fresh drawing to convert it to feet.

Avishek Chhibber, P.E., CFM
Civil 3D 2013 SP2, Win 7-64 bit
8GB RAM
Member
mfazio
Posts: 4
Registered: ‎06-20-2011
Message 9 of 12 (2,515 Views)

Re: USGS GridFloat

07-21-2011 08:32 AM in reply to: Hidden_Brain

Thank you very much, this helps a lot.

Valued Mentor
Hidden_Brain
Posts: 704
Registered: ‎03-24-2009
Message 10 of 12 (2,509 Views)

Re: USGS GridFloat

07-21-2011 09:06 AM in reply to: mfazio
No problem, glad I could help. Please mark it as a solution so that it can benefit other people!
Avishek Chhibber, P.E., CFM
Civil 3D 2013 SP2, Win 7-64 bit
8GB RAM
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