I have a dataset, representing a road network, in a Geographic Lat/Long coordinate reference system. The area covers three UTM zones.
I want to calculate the length of roads / polylines with metres as the unit of measurement.
What transformer should I use?
Hello. You could use ReprojectLenghtCalculator.
Also, I think you need to calculate the length in the original coordinate system, also the angle of vertex. Then use ReprojectLenghtCalculator and Aggregator and be careful to set the reprojected length field as Attribute to sum.
Hello. You could use ReprojectLenghtCalculator.
Also, I think you need to calculate the length in the original coordinate system, also the angle of vertex. Then use ReprojectLenghtCalculator and Aggregator and be careful to set the reprojected length field as Attribute to sum.
I don’t think that approach will give you the expected results as you’re calculating the final length as the sum of the distance of each vertex angle using the original distance from the line. In other words, if the line has 5 vertices, you’re calculating the distance 5 times for each vertex then summing them together; effectively giving you a calculated distance 5x the actually distance.
I think you’ll probably have to clip the road network to the utm zones, then re-project into the appropriate zone, calculate the length, aggregate/sum roads that go over multiple zones, then you can merge the distance back onto your LL dataset
I think you’ll probably have to clip the road network to the utm zones, then re-project into the appropriate zone, calculate the length, aggregate/sum roads that go over multiple zones, then you can merge the distance back onto your LL dataset
Have not tried this but I was thinking in the same directions.