There's a crew next door flying powerlines with some pretty neat gear.
With zilch knowlege of Lidar, I'm curious if its possible to obtain any accurate locations for insulators on tops of towers.
Being hilly around here, there's ample scope for bearing checks to towers on hilltops.
Maybe the silliest thought of the day, but nothing ventured nothing gained.
Richard, post: 327395, member: 833 wrote: There's a crew next door flying powerlines with some pretty neat gear.
With zilch knowlege of Lidar, I'm curious if its possible to obtain any accurate locations for insulators on tops of towers.
Being hilly around here, there's ample scope for bearing checks to towers on hilltops.
Maybe the silliest thought of the day, but nothing ventured nothing gained.
Yes, over the years we have surveyed many kilometres of lines (132Kv and 275kV) using LIDAR for the general survey and conductor alignments with total station/GPS combination for precise tower geometry. The LIDAR normally ties in pretty well with the ground survey, although the insulators on line towers tend to be poor - but the conductor adjacent is normally good. Section towers always seem to give good results, as the insulator strings don't hide the conductor clamps.
chris mills, post: 327424, member: 6244 wrote: Yes, over the years we have surveyed many kilometres of lines (132Kv and 275kV) using LIDAR for the general survey and conductor alignments with total station/GPS combination for precise tower geometry. The LIDAR normally ties in pretty well with the ground survey, although the insulators on line towers tend to be poor - but the conductor adjacent is normally good. Section towers always seem to give good results, as the insulator strings don't hide the conductor clamps.
I agree. I have seen LIDAR data that was amazingly accurate on the attachment locations. As you stated above, if the attachment point is obscured, the adjacent conductor is the next best point. That being , a lot of the quality of the data is up to the one that is processing the LIDAR data and preparing the comprehensive drawing/ data.
Yea surveyed a transmission line and had topo on the adjacent site with lidar with enough overlap to capture the towers. We compared the two and were very pleased with the result.
Richard, post: 327395, member: 833 wrote: There's a crew next door flying powerlines with some pretty neat gear.
With zilch knowlege of Lidar, I'm curious if its possible to obtain any accurate locations for insulators on tops of towers....
A few years back a surveyor from BPA (Bonneville Power Admin) gave a talk to our PLSO chapter on their survey activity. The maintain a fleet of planes, flying LIDAR on their high capacity transmission lines constantly. As the weather warms, and the flow of current warms the wires, they sag more or less. That sag can be modeled based on predicted current loads. Meanwhile the vegetation grows beneath them. When the wires get too close to the vegetation brush clearing crews are dispatched.
Thanks for replies.
Interesting field of data collection.
I'll see if they can clip out a section for me to play with.
As said above good results rely on suitable processing.
And with what I'm referring to probably a high level of interpretive skill.
We have mapped a few miles of line with LiDAR, I monitored the ambient conditions in the project corridor during the acquisition.
There is an http://www.pobonline.com/articles/97670-the-mapping-match-lidar-v-traditional-topo&apos ;">article in the current POB about LiDAR accuracy (not power lines), pretty good results.
SHG