USGS Aerial LIDAR of Denver

Discuss all your Aerial Lidar topics here including, Aeroplane, Helicopter & UAV
Post Reply
User avatar
bwiab
I have made 80-90 posts
I have made 80-90 posts
Posts: 88
Joined: Thu May 08, 2014 6:48 pm
Full Name: Emilio Ramirez
Company Details: Metro
Company Position Title: BIM Supervisor
Country: USA
Linkedin Profile: Yes

USGS Aerial LIDAR of Denver

Post by bwiab » Wed Sep 24, 2014 11:01 pm

So I downloaded some USGS lidar data to potentially use as a base map for all the scanning we are doing. This was through Earth Explorer. (Super cool that this is available by the way!) The data was available in a couple of formats and I used .las. I then attached the point clouds in Descartes which automatically converted them to .pods. I went to insert our local scans on top of the base and they were offset by about 600 miles.

Any ideas? Our local scans are geolocated based on the Colorado State Plane. What does USGS use for coordinates? Maybe a translation issue from .las to .pod?

Any ideas on the accuracy of the USGS lidar data?

Thanks!

User avatar
JReigard
I have made 20-30 posts
I have made 20-30 posts
Posts: 29
Joined: Tue Jun 17, 2014 6:22 pm
Full Name: Joe Reigard
Company Details: Survey Systems
Company Position Title: HDS Systems Manager
Country: USA
Linkedin Profile: No
Location: Colorado
Contact:

Re: USGS Aerial LIDAR of Denver

Post by JReigard » Thu Sep 25, 2014 1:13 am

Hey I was just about to do the same thing to another site. The USGS data I pulled in Denver looked great, and I cant wait to convert it over to my site.

I haven't looked to closely yet, but after a quick look I just assumed they were on UTM and not SPC CO. I have an NGS mark not far that we have tied in to so that was going to be my conversion point, but again I haven't done it yet. If I get time I'll do it tomorrow and let you know.

If I can ever offer any help, just let me know!

(Just checked a point and yes the one I grabbed is in UTM 13, just watch your units with converting)

Mark Christy
V.I.P Member
V.I.P Member
Posts: 256
Joined: Tue Aug 20, 2013 1:11 pm
Full Name: Mark Christy
Company Details: Veesus Ltd Arena4D.
Company Position Title: Technology Director
Country: United Kingdom
Linkedin Profile: Yes

Re: USGS Aerial LIDAR of Denver

Post by Mark Christy » Thu Sep 25, 2014 6:57 am

Hi Guys,

Sorry to jump in on your thread but this one piqued my interest as one of our key things with our tool is putting data in the right place in the world... so I logged in to USGS and downloaded some LAS data to have a play with in the Denver area.

Using our import tool I can select different coordinate systems and it'll show me where the data will end up. I tried a number of UTM 13N projections and the standard WGS84 gave the best result. Images below.

Hope this helps confirm the information you were looking for! :)

Cheers

Mark
Untitled.jpeg
Untitled 2.jpeg
Untitled 3.jpeg
Untitled 4.jpeg
You do not have the required permissions to view the files attached to this post.

Post Reply

Return to “Aerial Lidar”