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Author Topic: RAIL LINESURVEY-Single line of Images (20km) with GCP's  (Read 1179 times)

aerial_survey

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RAIL LINESURVEY-Single line of Images (20km) with GCP's
« on: July 10, 2018, 04:08:49 AM »
Is it bad practice to Survey  a rail line with a single centreline using ground control points using only overlap front and back OR should I at lease run 2 lines along the rail line?
Thanks in advance

Krzysztof

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Re: RAIL LINESURVEY-Single line of Images (20km) with GCP's
« Reply #1 on: July 10, 2018, 08:01:27 AM »
From my experience it's a really bad practice ;). I think you should run at least 3 lines. Also GCP's should be placed not only along the line, but also on the edges. Ex. 3 GCP's every 200meters of rail line.

SAV

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Re: RAIL LINESURVEY-Single line of Images (20km) with GCP's
« Reply #2 on: July 11, 2018, 03:51:16 PM »
Yes, I agree with Krzysztof and would also call it bad practice. At least 2 or 3 lines with high side overlap (70-90%) are necessary.

Regards,
SAV