LiDAR mosaic question

[NicholasBurke]

Hi,

I’m trying to combine LiDAR from two different sources into one file using the mosaic function. I then need to convert the resultant file into ascii format. I’ve been trying to do this in Arc using the mosaic function, before I export it to other software to build a ground model and carry out the hydraulic computations that are needed. The problem is that the ascii file I end up with is enormous, around 50X the size that I was expecting. Can anyone please let me know what might be going wrong?

Many thanks,

Nick

[DanPatterson_Retired]

ascii files will be larger than their binary equivalent, nothing is wrong.  What other formats does the destination software support?

[NicholasBurke]

Hi Dan, thanks for getting in touch. It will accept .txt, .asc or .igm files. Not a great choice I'm afraid.

[DanPatterson_Retired]

do you mean *.img

Supported raster dataset file formats—Help | ArcGIS for Desktop

Raster To Other Format—Help | ArcGIS for Desktop

because a non-text format is going to be smaller

[NicholasBurke]

No, IGM. Infoworks format.

[DanPatterson_Retired]

It appears you have your limits drawn, text will be text and much larger by default

[NicholasBurke]

OK, thanks anyway.