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OpenDroneMap / ODM

A command line toolkit to generate maps, point clouds, 3D models and DEMs from drone, balloon or kite images. 📷
https://opendronemap.org
GNU Affero General Public License v3.0
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DSM artefacts #380

Closed rion-saeon closed 6 years ago

rion-saeon commented 8 years ago

Hi,

I don't know whether it's QGIS but, when creating a DSM with las2dem (LAStools: https://rapidlasso.com/lastools/) and using ODM's ply.las products the following artefacts can be seen. This issues has been noticed before but, doesn't show on all generated DSMs:

capture

Any ideas?

(PS apart from the artefacts the result is impressive)

dakotabenjamin commented 8 years ago

I've not used las2dem, can you explain the artefacts to me? Are they the little blue lines?

rion-saeon commented 8 years ago

Correct, small blue lines. I've been using LAStools constantly. The only thing that changed was ODM.

Regards, Rion Lerm (jnr.) (+27) 76 913 8381 (Cell) (+27) 13 735 3536 (Office) Ndlovu Node Phalaborwa Gate, Kruger National Park South African Environmental Observation Network (SAEON)

Click here to learn about SAEON http://www.saeon.ac.za/saeon-background

On 20 September 2016 at 15:11, Dakota Benjamin notifications@github.com wrote:

I've not used las2dem, can you explain the artefacts to me? Are they the little blue lines?

— You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub https://github.com/OpenDroneMap/OpenDroneMap/issues/380#issuecomment-248296809, or mute the thread https://github.com/notifications/unsubscribe-auth/ANAtOCrz-Ss0yXHOPRfjL1KzNs67xtLjks5qr9tygaJpZM4KBmZK .

dakotabenjamin commented 8 years ago

I tried this: las2dem -i odm_georeferenced_model.ply.las -o dem1.tif

and got: las2dem-ex

rion-saeon commented 8 years ago

Thanks,

something quickly off topic...it seems your step size remained at 1.0. Changing to 0.01 produces a much finer DSM.

Any way, I don't find the artefact problem with all DSMs but, will try your command line paras'.

Regards, Rion Lerm (jnr.) (+27) 76 913 8381 (Cell) (+27) 13 735 3536 (Office) Ndlovu Node Phalaborwa Gate, Kruger National Park South African Environmental Observation Network (SAEON)

Click here to learn about SAEON http://www.saeon.ac.za/saeon-background

On 20 September 2016 at 15:27, Dakota Benjamin notifications@github.com wrote:

I tried this: las2dem -i odm_georeferenced_model.ply.las -o dem1.tif

and got: [image: las2dem-ex] https://cloud.githubusercontent.com/assets/1847818/18672042/714607e8-7f14-11e6-8f5f-e00f6b7a5062.png

— You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub https://github.com/OpenDroneMap/OpenDroneMap/issues/380#issuecomment-248300741, or mute the thread https://github.com/notifications/unsubscribe-auth/ANAtOEkib8XONxX31RfRjsxae5sbNQlUks5qr99QgaJpZM4KBmZK .

smathermather commented 8 years ago

@rionlerm -- are you using a licensed lastools? If not, it will introduce regular artifacts like this.

rion-saeon commented 8 years ago

Hello @smathermather ,

I don't use a licensed version but, these artefacts are NOT regular. Most of the DSMs I generate with LAStools show none.

smathermather commented 8 years ago

I don't think it does it every time... . You might try doing it in https://PDAL.io and see if you get the same artifacts.

dakotabenjamin commented 6 years ago

This issue is outdated and will be closed. Please open a new thread in http://community.opendronemap.org and reference this issue if you would like to continue the conversation.