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fix a number of corner cases with interpolation splitting

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Snapping a line to a point before splitting was meant to ensure
that the split point is really on the line. However, ST_Snap() does
not always behave well for this case. It may shorten the interpolation
line in some cases with the result that two points housenumbers
suddenly fall on the same point. It might also shorten the line down
to a single point which then makes ST_Split() crash.

Switch to a combination of ST_LineLocatePoint and ST_LineSubString
instead, which guarantees to keep the original geometry. Explicitly
handle the corner cases, where the split point falls on the beginning
or end of the line.
This commit is contained in:
Sarah Hoffmann
2023-04-06 16:54:00 +02:00
parent 5baa827b8a
commit ffe32af531
2 changed files with 93 additions and 12 deletions
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72
test/bdd/db/import/interpolation.feature
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@@ -29,14 +29,14 @@ Feature: Import of address interpolations
| N2 | place | house | 8 |
And the places
| osm | class | type | addr+interpolation | geometry |
| W1 | place | houses | even | 1,2 |
| W1 | place | houses | even | 2,1 |
And the ways
| id | nodes |
| 1 | 2,1 |
When importing
Then W1 expands to interpolation
| start | end | geometry |
| 4 | 6 | 8,9 |
| 4 | 6 | 9,8 |
Scenario: Simple odd two point interpolation
Given the grid with origin 1,1
@@ -341,7 +341,7 @@ Feature: Import of address interpolations
Then W1 expands to interpolation
| start | end | geometry |
| 4 | 4 | 144.963016 -37.762946 |
| 8 | 8 | 144.963144 -37.7622237 |
| 8 | 8 | 144.96314407 -37.762223692 |
Scenario: Place with missing address information
Given the grid
@@ -456,3 +456,69 @@ Feature: Import of address interpolations
| foo |
| x |
| 12-2 |
Scenario: Interpolation line where points have been moved (Github #3022)
Given the 0.00001 grid
| 1 | | | | | | | | 2 | 3 | 9 | | | | | | | | 4 |
Given the places
| osm | class | type | housenr | geometry |
| N1 | place | house | 2 | 1 |
| N2 | place | house | 18 | 3 |
| N3 | place | house | 24 | 9 |
| N4 | place | house | 42 | 4 |
And the places
| osm | class | type | addr+interpolation | geometry |
| W1 | place | houses | even | 1,2,3,4 |
And the ways
| id | nodes |
| 1 | 1,2,3,4 |
When importing
Then W1 expands to interpolation
| start | end |
| 4 | 16 |
| 20 | 22 |
| 26 | 40 |
Scenario: Interpolation line with duplicated points
Given the grid
| 7 | 10 | 8 | 11 | 9 |
Given the places
| osm | class | type | housenr | geometry |
| N1 | place | house | 2 | 7 |
| N2 | place | house | 6 | 8 |
| N3 | place | house | 10 | 8 |
| N4 | place | house | 14 | 9 |
And the places
| osm | class | type | addr+interpolation | geometry |
| W1 | place | houses | even | 7,8,8,9 |
And the ways
| id | nodes |
| 1 | 1,2,3,4 |
When importing
Then W1 expands to interpolation
| start | end | geometry |
| 4 | 4 | 10 |
| 12 | 12 | 11 |
Scenario: Interpolaton line with broken way geometry (Github #2986)
Given the grid
| 1 | 8 | 10 | 11 | 9 | 2 | 3 | 4 |
Given the places
| osm | class | type | housenr |
| N1 | place | house | 2 |
| N2 | place | house | 8 |
| N3 | place | house | 12 |
| N4 | place | house | 14 |
And the places
| osm | class | type | addr+interpolation | geometry |
| W1 | place | houses | even | 8,9 |
And the ways
| id | nodes |
| 1 | 1,8,9,2,3,4 |
When importing
Then W1 expands to interpolation
| start | end | geometry |
| 4 | 6 | 10,11 |