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quaelnix avatar quaelnix commented on July 4, 2024 2

My home lap contains a 5 km long monotonous ascend in a valley, which does highlight the limitations of the SRTM data:
brouter_srtm_lidar_cmp
brouter_lidar_sub
brouter_srtm_sub

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quaelnix avatar quaelnix commented on July 4, 2024 1

The barometer data was obtained from the average of 10 trips (5 in each direction) along the route:
brouter_srtm_lidar_cmp
brouter_lidar_sub
brouter_srtm_sub

from brouter.

abrensch avatar abrensch commented on July 4, 2024

Hi Sonny,

yes updating the eleavation model is definitely on the agenda. It's not space savings that prevented updating to 1'' srtm data so far. It's just that I could not prove a significant effect on the results. Switching to lidar also requires some QA to look for edge effects. But I'm sure it will be an improvement.

Thanx for providing the aggregated data, really helpful.

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afischerdev avatar afischerdev commented on July 4, 2024

@abrensch
It seems you have some ideas for testing the data. Great. I have already prepared an update, but it will take some days for preparation.

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zod avatar zod commented on July 4, 2024

I generated segments using Sonny's 3asec DTM for germany and a (slow) routing instance is available at https://brouter.knid.net/

@quaelnix Can you share this route and generate a plot which also includes the lidar data?

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quaelnix avatar quaelnix commented on July 4, 2024

It's not space savings that prevented updating to 1'' srtm data so far. It's just that I could not prove a significant effect on the results.

Unless I've done something wrong, this seems to apply to the LiDAR data as well, which honestly surprises me a bit.

I'm sure it will be an improvement.

It seems like a huge improvement (and it also greatly improves the accuracy of travel time estimation):
brouter_srtm_lidar_cmp

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quaelnix avatar quaelnix commented on July 4, 2024

@abrensch, I've been using the LiDAR elevation data extensively over the past few weeks, and I have to say it's amazing.


However, depending on what elevation data we use, this seems to require different thresholds:

if (ehb > 0) {
ascend += ehb;
ehb = 0;
} else if (ehb < -10) {
ehb = -10;
}

5 m instead of 10 m apparently does the trick for the LiDAR data.

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quaelnix avatar quaelnix commented on July 4, 2024

My winter commute along two rivers with several bridges and many underpasses:

@rkflx, I'm having a hard time finding even one place where the LIDAR data (1asec) fails.

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