Skip to main content
Question

Point cloud thinning

  • July 13, 2018
  • 5 replies
  • 137 views
M
Forum|alt.badge.img

As I have seen in

https://knowledge.safe.com/articles/1070/thinning-and-combining-point-clouds.html

 

It is possible to do points cloud thinning in FME. My problem is that I don't want to thin them by any of offered possibilities.

 

In places with similar altitude, I would like to delete more points, and in places with higher elevation differences I would like to keep more points.

 

For beginning I am extracting coordinates but I am not sure how to use that for filtering and thinning the las point cloud.

 

 

Thank you all in advance for all the help.

Dejan

    This post is closed to further activity.
    It may be an old question, an answered question, an implemented idea, or a notification-only post.
    Please check post dates before relying on any information in a question or answer.
    For follow-up or related questions, please post a new question or idea.
    If there is a genuine update to be made, please contact us and request that the post is reopened.

    5 replies

    daveatsafe
    Safer
    Forum|alt.badge.img+20
    • daveatsafeSafer
    • Safer
    • July 13, 2018

    Hi @maliodpalube,

    Please try using the PointCloudSimplifier transformer to thin your point cloud. This transformer uses a sophisticated algorithm to thin the point cloud while retaining its character.

    pratap
    Contributor
    Forum|alt.badge.img+12
    • pratapContributor
    • Contributor
    • July 14, 2018

    Hi @DaveAtSafe,

    Does this PointCloudSimplifier transformer will add more points too?

    Pratap

    M
    Forum|alt.badge.img

    Hi @maliodpalube,

    Please try using the PointCloudSimplifier transformer to thin your point cloud. This transformer uses a sophisticated algorithm to thin the point cloud while retaining its character.

    I have tried but I am not sure how to set it to keep places with higher altitude differences and how to delete some points on flat areas.

     

    If You would be able for some hint, I would be really thankful.

     

    daveatsafe
    Safer
    Forum|alt.badge.img+20
    • daveatsafeSafer
    • Safer
    • July 16, 2018
    I have tried but I am not sure how to set it to keep places with higher altitude differences and how to delete some points on flat areas.

     

    If You would be able for some hint, I would be really thankful.

     

    Hi @maliodpalube,

     

    The transformer will automatically delete more points in the flat areas. You just need to set the degree of simplification in the Filter Ratio.

     

    pratap
    Contributor
    Forum|alt.badge.img+12
    • pratapContributor
    • Contributor
    • July 18, 2018

    Hi @maliodpalube,

    You have to divide the area based on Z value (i.e.elevation) using PointCloudFilter (it will be just like testfilter) transformer. For this, you have to filter/divide the data using expression as mentioned below...

    @Component(z) < 500--> Port1

    @Component(z) > 505&&

    @Component(z) < 510--> Port2

    and then use appropriate transformer on area wise. (Z value is just assumption, it needs to change as per your data)

    Later combine all the data write to las file...

    Hope this helps...

    Pratap

    Community Stats

    32,207
    Posts
    122,305
    Replies
    39,891
    Members

    Latest FME

    Terms & ConditionsCookie settingsAccessibility statement
    A product of
    Safe Software respectfully acknowledges that we live, learn and work on the traditional and unceded territories of the Kwantlen, Katzie, and Semiahmoo First Nations.