I would like to create clusters of line data (geometry) for sampling, the geometry would be connected within each cluster. So far I’ve thought of:Create a bounding polygon > split it into X polygons using Tiler or some other transformer > SpatialFilter. This would be the easiest I guess, but this would create dead ends at the geometry around the polygon boundary. Ideally, I would like a closed/self-contained ‘route’ but not really necessary. SpatialSorter > group every X rows. But I realize this doesn’t give a nice closed-off route either and you would have to manually see how many rows to pick to create a nicer cluster so probably better off with the first option.Any better ideas? Additionally, it would also be good to be able to define a criteria for sampling like having X km of main roads and Y km of small roads in each cluster but I suppose that can come afterwards by calculating the counts per cluster and choosing clusters to hit the quota.

I would like to create clusters of line data (geometry) for sampling, the geometry would be connected within each cluster. So far I’ve thought of:Create a bounding polygon >split it into X polygons using Tiler or some other transformer > SpatialFilter. This would be the easiest I guess, but this would create dead ends at the geometry around the polygon boundary. Ideally, I would like a closed/self-contained ‘route’ but not really necessary.SpatialSorter > group every X rows. But I realize this doesn’t give a nice closed-off route either and you would have to manually see how many rows to pick to create a nicer cluster so probably better off with the first option.Any better ideas? Additionally, it would also be good to be able to define a criteria for sampling like having X km of main roads and Y km of small roads in each cluster but I suppose that can come afterwards by calculating the counts per cluster and choosing clusters to hit the quota.Hi @jerrylim735This is interesting. Can you share a pic of what that would look like? I was going to make a suggestion using the Sampler but that’s not the issue. It’s how the lines are connected after selecting for sample right?

Question

Cluster sampling of line data

13 days ago
March 28, 2025
2 replies
56 views

jerrylim735
Contributor
1 reply

I would like to create clusters of line data (geometry) for sampling, the geometry would be connected within each cluster. So far I’ve thought of:

Create a bounding polygon > split it into X polygons using Tiler or some other transformer > SpatialFilter. This would be the easiest I guess, but this would create dead ends at the geometry around the polygon boundary. Ideally, I would like a closed/self-contained ‘route’ but not really necessary.
SpatialSorter > group every X rows. But I realize this doesn’t give a nice closed-off route either and you would have to manually see how many rows to pick to create a nicer cluster so probably better off with the first option.

Any better ideas? Additionally, it would also be good to be able to define a criteria for sampling like having X km of main roads and Y km of small roads in each cluster but I suppose that can come afterwards by calculating the counts per cluster and choosing clusters to hit the quota.

+31

crutledge
Enthusiast
109 replies
13 days ago
March 28, 2025

jerrylim735 wrote:

I would like to create clusters of line data (geometry) for sampling, the geometry would be connected within each cluster. So far I’ve thought of:

Create a bounding polygon > split it into X polygons using Tiler or some other transformer > SpatialFilter. This would be the easiest I guess, but this would create dead ends at the geometry around the polygon boundary. Ideally, I would like a closed/self-contained ‘route’ but not really necessary.
SpatialSorter > group every X rows. But I realize this doesn’t give a nice closed-off route either and you would have to manually see how many rows to pick to create a nicer cluster so probably better off with the first option.

Hi @jerrylim735 This is interesting. Can you share a pic of what that would look like? I was going to make a suggestion using the Sampler but that’s not the issue. It’s how the lines are connected after selecting for sample right?

At your service ^B

jerrylim735
Author
Contributor
1 reply
9 days ago
April 1, 2025

Hey @crutledge, it would be something like this (did this manually previously, although now that I zoom into it, it wasn’t the best clustering either in terms of ‘closing off’ the cluster).

Ideally, I would like both the sampling and ‘line connection’ to be done either at the same time or one before another, but priority would be the line connection. Since sampling can be done thereafter (assuming there are enough clusters I suppose).

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Cluster sampling of line data