Changes between Initial Version and Version 17 of Ticket #20716


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Timestamp:
2021-08-24T20:23:31+02:00 (3 years ago)
Author:
gaben
Comment:

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  • Ticket #20716

    • Property Summary Search for missing power line support features → [patch] Search for missing power line support features
    • Property Cc Klumbumbus added

  • Ticket #20716 – Description

    initial v17  
    11==== Problem
    2 The power lines are sometimes drawn from low quality satellite imagery and support features can be easily missed.
     2The power lines are sometimes drawn from low quality satellite imagery, and support features can be easily missed.
    33
    44==== Proposed solution
    55Add a java validator test to sort these issues out. It works as following:
    66- an average node distance calculated for the whole way (`line` or `minor_line`)
    7 - for above-average segment lengths, a warning message created where both nodes highlighted to make manual checks faster
     7- using mean and individual segment lengths, the standard deviation calculated
     8- if exceeds a threshold, a warning message created where both nodes highlighted to make manual checks faster
    89
    910Way requirements to lower false positives:
    1011- the way has to have at least 5 nodes
    11 - maximum node distance is 2x of the average
    12 In my testing, they give good results.
     12- segment length must be higher than a specific value, calculated as follows:
     13
     14default `threshold`
     15- power=line -> `1.6`
     16- power=minor_line -> `1.4`
     17if `(mean / stdDev) < 4` (high inconsistency) an extra `0.2` threshold value added.
     18
     19If any segment length exceeds `mean * threshold`, the warning fired. In my testing, they give good results.
    1320
    1421==== Usage
    15 Run the validator, as usual, an extra warning appears if the issue detected.
     22Run the validator as usual, an extra warning appears if the issue detected.