Land Surveyor Forum

Lidar survey disturbed!

Posted by Lalith Senanayake on July 11, 2016 at 9:27am in Land Surveying Industry Talk
A Lidar survey done In Sri Lanka done by survey department has experienced a disturbance of GPS signal attached to the unit inside flight.The area is in hill country,there is a Radar station established for aviation purposesAnd telecom towers around the area.This was done by JAICA,they have done several runs but GPS signals not recorded even after switching off the radar station,as Lidar will not work properly without GPS recording,they have cancelled that area and silected another area.According to the department sources stil not aware about this finomina.If engine represented such incident?In case this type of disturbance exist will it not effect our GPS surveys on ground?That clearly highlights the importance of ground survey methods though technology bypasses us.
Views: 86

You need to be a member of Land Surveyors United - Surveying Education Community to add thoughts!

Join Land Surveyors United - Surveying Education Community

Email me when people reply –
Follow

Replies

  • Land Surveyor
    Leel July 14, 2016 at 12:06am

    Hi Lalith

    Two incidents I can remember back during mid-1995 in Oman (using Leica 300).

    Near Muscat (Oman) airport it was possible to receive GPS signals only at certain times.

    In the desert around Nimr (Oman) no GPS signals close to a Radar station.

    Believe James Starbuck’s reply is the answer!

    Cheers

    Thilak Balachandra

    • Lalith Senanayake > Leel July 14, 2016 at 9:36am
      Then how can be believe the data gathered by GPS for controles?
      Are we to check those with ground survey mathods?
      Lalith
      • Land Surveyor
        Leel > Lalith Senanayake August 22, 2016 at 4:40pm

        Lalith

        Surveying being a technique, that people use equipment for measurements to determine positions :

        Human, equipment and environmental errors can occur during measurements.

        One has to have sufficient cross checks to minimize / eliminate errors.

        As Lidar depend on GPS, it is unable to operate if there are no signals. Need to use an alternative methods.

        Regards

        Thilak

  • Land Surveyor
    James Starbuck July 12, 2016 at 4:07pm

    Hi,

    I remember doing survey work at a small local airfield in England back in the 90s. We were using Trimble GPS and it was behaving very strangely, so much so that we couldn't work. We guessed the radar might have something to do with it since it was visible and spinning round. We asked if it could be turned off since there was no activity, it was a Sunday and there was nothing happening that day so they were ok with that. When it was turned off everything was fine.

    I have always wanted to find out if this is a real issue or not.

    Regards,

    James.

  • Land Surveyor
    Javier A bañados July 11, 2016 at 5:20pm

    Lalith

    That sound very extrage to me.

    We provide LIdar service anually to an oil company, and the their cans pass near inside aor principal aerport.

    Never experimet that issue.

    Mast be another problem.

    Best

    • Lalith Senanayake > Javier A bañados July 12, 2016 at 6:04am
      Hi Javier

      May be something like " Bemuda Triangle"

      I need feed back from survey department ,it is interesting to know,

      Regards

      Lalith
This reply was deleted.

Answer As your Facebook Page

Global Surveyor Forum

  • Most Popular Posts
  • Latest Activity
  • Featured Posts
  • Most Popular Discussion

Latest Discussions by Category

  • Best Practices
  • Local Forums and More
  • Introduce Yourself
  • Surveying Jobs
  • Surveying Tips & Tricks
  • Equipment Advice

Add Your Expertise

  • Contributors
  • Featured Discussions

How to Utilize Surveyor Forums

How to use Forums
Our forums on Land Surveyors United are here to be used as much for finding help with problems in the field as the are for you to express your opinions on anything that has to do with land surveying in general. Feel free to share anything that is on your mind, as long as it isn't meant to damage another member's reputation. Please keep it clean and help insure that everyone has the opportunity to enjoy the benefits of being part of a community that grows together.

We are committed to allowing freedom of expression for all of our members, and that includes maintaining a safe space for people with opposing views to express themselves. We get posts from all over the country and even the globe, so needless to say, people come with different viewpoints on lad surveying practices and processes. We see this diversity and variety as a real strength-- dialogue and debate are an integral part of the educational process, as well as an important tool in exploring different sides of complex issues.

All Community Hubs inside the community have their own forum for asking specific questions to other surveyors, by location, equipment type, etc.

Global Forums

USA Surveying Forums
Asia Surveying Forums
Africa Surveying Forums
Middle East Surveying Forums
European Surveying Forums
South American Surveying Forums
Oceania Surveying Forums
Survey Equipment Support Forums
Search Survey Photos

Surveyor Forum Categories

Choose Your Forum Category

Latest Blog Posts

Most Popular Blog Posts

Blog Topics by Tags

Monthly Archives