[GRASS-user] LiDAR in Grass GIS

GRASS GRASS user
1

Hi,

I am trying to bring in the following LiDAR dataset into grass GIS:
https://geo.nyu.edu/catalog/nyu_2451_38621

and I keep getting a projection error, even-though the dataset is projected. Any ideas on how to get around this?

Thanks

···

Le gach dea ghui,

Shane Carey
GIS and Data Solutions Consultant

2

Hi,

2018-03-21 11:20 GMT+01:00 Shane Carey <careyshan@gmail.com>:

I am trying to bring in the following LiDAR dataset into grass GIS:
https://geo.nyu.edu/catalog/nyu_2451_38621

and I keep getting a projection error, even-though the dataset is projected.
Any ideas on how to get around this?

please provide details - exact commads you performed. How have you
created a new location, how input data has been imported, ...?

Ma

--
Martin Landa
http://geo.fsv.cvut.cz/gwiki/Landa
http://gismentors.cz/mentors/landa

3

Hi Martin,

Thanks for your reply

This is the command:

r.in.lidar -e input=/home/user/LIDAR/Dublin/nyu_2451_38621_laz/T_317000_234500.laz output=Dub resolution=1.0

I created the new location based on the laz dataset. I am trying to bring in a laz dataset.

Thanks

···

On Wed, Mar 21, 2018 at 10:29 AM, Martin Landa <landa.martin@gmail.com> wrote:

Hi,

2018-03-21 11:20 GMT+01:00 Shane Carey <careyshan@gmail.com>:

I am trying to bring in the following LiDAR dataset into grass GIS:
https://geo.nyu.edu/catalog/nyu_2451_38621

and I keep getting a projection error, even-though the dataset is projected.
Any ideas on how to get around this?

please provide details - exact commads you performed. How have you
created a new location, how input data has been imported, …?

Ma

–
Martin Landa
http://geo.fsv.cvut.cz/gwiki/Landa
http://gismentors.cz/mentors/landa

–

Le gach dea ghui,

Shane Carey
GIS and Data Solutions Consultant

4

2018-03-21 11:33 GMT+01:00 Shane Carey <careyshan@gmail.com>:

r.in.lidar -e
input=/home/user/LIDAR/Dublin/nyu_2451_38621_laz/T_317000_234500.laz
output=Dub resolution=1.0

well and what is a error message? Ma

--
Martin Landa
http://geo.fsv.cvut.cz/gwiki/Landa
http://gismentors.cz/mentors/landa

5

Hi,

[please keep discussion on ML]

2018-03-21 11:39 GMT+01:00 Shane Carey <careyshan@gmail.com>:

ERROR: Projection of dataset does not appear to match current location.
Dataset proj = 0 (unreferenced/unknown)

However, I have set the projection of the dataset, so I know its not that.

by "dataset" do you mean location or input data (LAZ/LAS)? Anyway
error says, that input data (LAS/LAZ) lacks SRS info. If you are sure
that your GRASS location has been set up correctly (check by `g.proj
-p`) that you can use `-o` to skip projection check, see r.in.lidar
manual page for details.

Ma

--
Martin Landa
http://geo.fsv.cvut.cz/gwiki/Landa
http://gismentors.cz/mentors/landa

6

Dear list,

I have a question to the function v.decimate.
Has the output normally (without using flag:-x) an attribute table?

Thanks,
Anika

7

Ok great - I will try that! Thanks

···

Le gach dea ghui,

Shane Carey
GIS and Data Solutions Consultant

8

On Wed, Mar 21, 2018 at 12:00 PM, Anika Bettge <bettge@mundialis.de> wrote:

I have a question to the function v.decimate.
Has the output normally (without using flag:-x) an attribute table?

No, unfortunately, it doesn’t preserve attribute table, but it is a reasonable enhancement proposal, please open an issue for it.

http://trac.osgeo.org/grass/

Best,

Vaclav