Hi guys
I do a lot of "house and garden" surveys and I'm looking at getting a laser scanner to help with doing floor plans and elevations . I cannot afford one of the really expensive ones so its a choice between the new Leica BLK360 or the Faro M7o. Both are sub $20,000 but only have an x,y,z accuracy of around 8mm over 20 metres. I'm worried this inaccuracy will accumulate and lead to floor plans getting twisted to unacceptable tolerances after a large number of scans. I always aim for 25mm or less accuracy for all points.
I heard/read that you can improve the accuracy of laser scanning by using traditional control set out with a total station. I'm used to introducing control into houses when doing measured building surveys but can someone explain how its used to improve the accuracy of laser scanned plans.
Cheers, Andrew
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Scanning targets and working from the whole to the part. Continue to use the surveying principles you use with other equipment.
I have only done a few building surveys with laser scanners but the best way to maintain accuracy seemed to be by using scanning targets and then registering in the software. I suppose you could traverse through a building and shoot these targets as well but I don't think it is necessary. I have had good results with cloud to cloud registration in Leica Cyclone as well but would need to test some more.?ÿ
Also extracting floor plans from laser scan data is not as easy as you might think. Elevations are a breeze though.
You can go over to laserscanningforum. Has a wealth of knowledge from surveyors and other users on scanners.?ÿ
Typically for laser scanning, I do not use cloud to cloud but use targets, which are either paper or spheres. They give the best quality in registration and quality can be assured. I use the 'traditional' control for transforming into survey coordinates. It forms as a check, but if done properly, your laser scans can be more accurate than your controls, can be checked by their residuals. I use my total station to shoot into the paper targets or one of my spheres has a prism embedded at the centre (but that sphere was really expensive!)
Using laser scanner brings the work back to office. You spend less time in the field but a hell lot more in the office, to register, process and then generate the deliverables. I would suggest you go rent or go for some training before committing.?ÿ
BLK360 is good for interior but outdoor scans, the data gets very noisy.?ÿ
Take a look at Holobuilder and a 360 camera
Also understand the accuracy requirements for floor plans, which are typically substantially less than surveying accuracy requirements.
