Displaying details of Point Cloud

[MakerMovement7]

trafficstars

I have a point cloud that displays in the pptk.viewer(), however, I can't seem to zoom the camera to get close enough to see the data. The data is a point cloud of a road collected from lidar on a vehicle on that road, but whenever I view it in the viewer, it just comes out as what looks like a line (presumably the line of the dots that make the road), but I can't seem to zoom in to look at the details of the road. The lidar LAS file was converted to an X,Y,Z numpy array using liblas and lat, lon, alt values.

[conlin-matt]

Hi MarkerMovement7,

I know it's been a long time since you asked this question, but I just figured out how to solve this issue and figured I'd post in case anyone in the future stumbles upon this problem.

The issue is that your x and y values are in units of degrees, while you z values are in units of height (m or ft or whatever). You need to convert your x and y lat/lon values in degrees into the same units as your z values, i.e. you need to project your points into a coordinate reference system that does not use degrees (e.g. UTM). There are a number of ways to do this, and GIS forums online should help. I found it easiest to convert my x and y in lat/lon into UTM coordinates using the UTM package.

[MakerMovement7]

Thank you for taking the time to write a response. I could not figure out why in the world every lidar viewer I was tried would end up looking the same way: zoomed out with a tiny line of dots. What the heck?!? Every time! Wow, so yes sir. That is extremely valuable information, thank you! Whew, it took a while to get an answer but man it feels good to get one. Sincerely,JamesSent via the Samsung Galaxy S7, an AT&T 4G LTE smartphone -------- Original message --------From: Matthew Conlin [email protected] Date: 5/21/19 10:22 AM (GMT-08:00) To: heremaps/pptk [email protected] Cc: MakerMovement7 [email protected], Author [email protected] Subject: Re: [heremaps/pptk] Displaying details of Point Cloud (#8) Hi MarkerMovement7, I know it's been a long time since you asked this question, but I just figured out how to solve this issue and figured I'd post in case anyone in the future stumbles upon this problem. The issue is that your x and y values are in units of degrees, while you z values are in units of height (m or ft or whatever). You need to convert your x and y lat/lon values in degrees into the same units as your z values, i.e. you need to project your points into a coordinate reference system that does not use degrees (e.g. UTM). There are a number of ways to do this, and GIS forums online should help. I found it easiest to convert my x and y in lat/lon into UTM coordinates using the UTM package.

—You are receiving this because you authored the thread.Reply to this email directly, view it on GitHub, or mute the thread. [ { "@context": "http://schema.org", "@type": "EmailMessage", "potentialAction": { "@type": "ViewAction", "target": "https://github.com/heremaps/pptk/issues/8?email_source=notifications\u0026email_token=AHYXSTYYPHMAQKG3X6ETGJ3PWQVXDA5CNFSM4GUQQ3T2YY3PNVWWK3TUL52HS4DFVREXG43VMVBW63LNMVXHJKTDN5WW2ZLOORPWSZGODV4TH6Y#issuecomment-494482427", "url": "https://github.com/heremaps/pptk/issues/8?email_source=notifications\u0026email_token=AHYXSTYYPHMAQKG3X6ETGJ3PWQVXDA5CNFSM4GUQQ3T2YY3PNVWWK3TUL52HS4DFVREXG43VMVBW63LNMVXHJKTDN5WW2ZLOORPWSZGODV4TH6Y#issuecomment-494482427", "name": "View Issue" }, "description": "View this Issue on GitHub", "publisher": { "@type": "Organization", "name": "GitHub", "url": "https://github.com" } } ]