Hi Doug,
you can create photogrammetric export models (e.g. DEM, point cloud)
with the open source software OpenDroneMap. Try WebODM [1] with the
graphical user interface - you can install it with docker. The DEM is
perfect for QGIS, you can create a 3D view of your Street with the 3d
map view in QGIS and calculate the volume of the cracks.
Furthermore you can compare your pointclouds with the open source
software CloudCompare [2] (Function "Cloud to Cloud Distance (C2C)") -
with this function you can determine the change between two models (your
two flights).
[1] https://www.opendronemap.org/webodm/
[2] https://www.danielgm.net/cc/
Greetings Charly
Charlotte Toma
GIS-Consultant
WhereGroup GmbH
Eifelstraße 7
53119 Bonn
Germany
Fon: +49 (0)228 / 90 90 38 - 24
Fax: +49 (0)228 / 90 90 38 - 11
[email protected]
www.wheregroup.com
Geschäftsführer:
Olaf Knopp, Peter Stamm
Amtsgericht Bonn, HRB 9885
Am 14.12.2019 um 07:05 schrieb Doug <[email protected]>:
I have imported a set of drone pictures to QGIS. They show the
streets in my subdivision. I want to “record” the cracks in
the pavement to be able to compare them over time. I want to be
able to segment the streets in arbitrary lengths. For each
segment, I want to “draw” the cracks (in layers) to record
where they are. Every year or two I will repeat the process. The
purpose is to be able to compare the set of cracks in successive
snapshots to see how the asphalt is holding up and identify
underlying problems. I would love to have some software to find
the cracks for me and generate the crack layer, if anyone knows of
such software.
First problem: I can trace the outline of the streets to generate
a layer which represents to road surface. Is there a way to slice
that layer by picking two points to “slice” the layer and then
have two layers? And then repeat the process so that I get the
segments that I want? Alternatively, is there a way to create a
segment and “snap” to next segment so there is not overlap or
missing space?
Second problem. Given that I have a layer representing a segment
of the road surface, can I “draw” the cracks for that segment
such that every line in the cracks layer is related (as in SQL) to
the segment it reside in?
Once I have the road surface segments, and the associated cracks,
I can then use SQL to generate all sorts of reports on the cracks:
average and median length, number of horizontal and vertical
cracks, total crack length per road surface segment (or square
feet), etc.
Thanks.
Doug
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