Importing Sydney LIDAR Data (*.asc) Query

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Tom Gardiner
Posts: 3
Joined: Mon Jul 13, 2015 11:50 am

Importing Sydney LIDAR Data (*.asc) Query

Post by Tom Gardiner »

I am trying to import some LIDAR for Sydney that we were supplied with. The file extension is *.asc and some corresponding 1kb sized *.TAB files were included. Each of the .asc files are around 27MB.

I have tried importing each of these files as ASCII, and 12D appears to process the data (takes a few minutes to import), but no models are created.

Does anyone have any tips for how I can bring these files into 12D to create a surface?

Thanks in advance,
Tom
Lee Gregory
12d Support
Posts: 2016
Joined: Thu Sep 29, 2005 6:06 pm

Post by Lee Gregory »

What format are the .asc files ?
Peter Murray
Posts: 67
Joined: Fri Oct 21, 2005 8:24 am
Location: Brisbane

Post by Peter Murray »

If you are using the Practice Version you will blow the limit with Lidar data.
Tom Gardiner
Posts: 3
Joined: Mon Jul 13, 2015 11:50 am

Post by Tom Gardiner »

Lee Gregory wrote:What format are the .asc files ?
Hi Lee,
The file extension is just .ASC so not exactly sure. The data appears to be for a grid - when you open this it looks like this;
ncols 2000
nrows 2000
xllcorner 326000.000
yllcorner 6246000.000
cellsize 1.0000
nodata_value -9999
33.264 33.289 33.347 33.427 33.507 33.588........

Also Peter, I'm using a fully licensed version of 12D - I just posted this up in the wrong spot.
Peter Murray
Posts: 67
Joined: Fri Oct 21, 2005 8:24 am
Location: Brisbane

Post by Peter Murray »

Try the option File->Data Input->DEM

You might have to play around with some of the options to get what you want.
Tom Gardiner
Posts: 3
Joined: Mon Jul 13, 2015 11:50 am

Post by Tom Gardiner »

Peter Murray wrote:Try the option File->Data Input->DEM

You might have to play around with some of the options to get what you want.
You're a star Peter. That worked great.
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