Mercurial > gemma

annotate schema/isrs_functions.sql @ 2411:27d3e9eda8b6

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
client: table component: fade transition for adding/removing items
author Markus Kottlaender <markus@intevation.de>
date Thu, 28 Feb 2019 12:16:27 +0100
parents 8481e6266691
children 4c16f5ad1905
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
1720
29a0fe218af9 Add missing license header
Tom Gottfried <tom@intevation.de>
parents: 1717
diff changeset
1 -- This is Free Software under GNU Affero General Public License v >= 3.0
29a0fe218af9 Add missing license header
Tom Gottfried <tom@intevation.de>
parents: 1717
diff changeset
2 -- without warranty, see README.md and license for details.
29a0fe218af9 Add missing license header
Tom Gottfried <tom@intevation.de>
parents: 1717
diff changeset
3
29a0fe218af9 Add missing license header
Tom Gottfried <tom@intevation.de>
parents: 1717
diff changeset
4 -- SPDX-License-Identifier: AGPL-3.0-or-later
29a0fe218af9 Add missing license header
Tom Gottfried <tom@intevation.de>
parents: 1717
diff changeset
5 -- License-Filename: LICENSES/AGPL-3.0.txt
29a0fe218af9 Add missing license header
Tom Gottfried <tom@intevation.de>
parents: 1717
diff changeset
6
2373
4aabbf324e55 Fix cutting of axis segment between two distance marks
Tom Gottfried <tom@intevation.de>
parents: 2232
diff changeset
7 -- Copyright (C) 2018, 2019 by via donau
1720
29a0fe218af9 Add missing license header
Tom Gottfried <tom@intevation.de>
parents: 1717
diff changeset
8 -- – Österreichische Wasserstraßen-Gesellschaft mbH
29a0fe218af9 Add missing license header
Tom Gottfried <tom@intevation.de>
parents: 1717
diff changeset
9 -- Software engineering by Intevation GmbH
29a0fe218af9 Add missing license header
Tom Gottfried <tom@intevation.de>
parents: 1717
diff changeset
10
29a0fe218af9 Add missing license header
Tom Gottfried <tom@intevation.de>
parents: 1717
diff changeset
11 -- Author(s):
29a0fe218af9 Add missing license header
Tom Gottfried <tom@intevation.de>
parents: 1717
diff changeset
12 -- * Tom Gottfried <tom@intevation.de>
29a0fe218af9 Add missing license header
Tom Gottfried <tom@intevation.de>
parents: 1717
diff changeset
13 -- * Sascha Wilde <wilde@intevation.de>
29a0fe218af9 Add missing license header
Tom Gottfried <tom@intevation.de>
parents: 1717
diff changeset
14
1629
9d51f022b8ee Introduce SQL function to clip an area to a stretch
Tom Gottfried <tom@intevation.de>
parents:
diff changeset
15 -- Clip an area to a stretch given by a pair of ISRS location codes.
9d51f022b8ee Introduce SQL function to clip an area to a stretch
Tom Gottfried <tom@intevation.de>
parents:
diff changeset
16 -- Uses the table waterway.distance_marks_virtual to map ISRS location codes
9d51f022b8ee Introduce SQL function to clip an area to a stretch
Tom Gottfried <tom@intevation.de>
parents:
diff changeset
17 -- to their geo-location and the table waterway.waterway_axis to retrieve
9d51f022b8ee Introduce SQL function to clip an area to a stretch
Tom Gottfried <tom@intevation.de>
parents:
diff changeset
18 -- perpendicular direction at these geo-locations.
9d51f022b8ee Introduce SQL function to clip an area to a stretch
Tom Gottfried <tom@intevation.de>
parents:
diff changeset
19 -- Distance marks are assumed to be near the axis and the area passed as
9d51f022b8ee Introduce SQL function to clip an area to a stretch
Tom Gottfried <tom@intevation.de>
parents:
diff changeset
20 -- argument is assumed to intersect with the axis
9d51f022b8ee Introduce SQL function to clip an area to a stretch
Tom Gottfried <tom@intevation.de>
parents:
diff changeset
21 -- (use e.g. waterway area or fairway dimensions).
2232
7936b46a88d4 Handle invalid multipolygons in area generation from stretch
Tom Gottfried <tom@intevation.de>
parents: 1983
diff changeset
22 -- If a multipolygon is passed, the union of the polygons intersecting with the
7936b46a88d4 Handle invalid multipolygons in area generation from stretch
Tom Gottfried <tom@intevation.de>
parents: 1983
diff changeset
23 -- relevant part of the axis is used for clipping.
1629
9d51f022b8ee Introduce SQL function to clip an area to a stretch
Tom Gottfried <tom@intevation.de>
parents:
diff changeset
24 CREATE OR REPLACE FUNCTION ISRSrange_area(
9d51f022b8ee Introduce SQL function to clip an area to a stretch
Tom Gottfried <tom@intevation.de>
parents:
diff changeset
25 stretch isrsrange,
9d51f022b8ee Introduce SQL function to clip an area to a stretch
Tom Gottfried <tom@intevation.de>
parents:
diff changeset
26 area geometry
9d51f022b8ee Introduce SQL function to clip an area to a stretch
Tom Gottfried <tom@intevation.de>
parents:
diff changeset
27 ) RETURNS geometry
9d51f022b8ee Introduce SQL function to clip an area to a stretch
Tom Gottfried <tom@intevation.de>
parents:
diff changeset
28 AS $$
9d51f022b8ee Introduce SQL function to clip an area to a stretch
Tom Gottfried <tom@intevation.de>
parents:
diff changeset
29 WITH
9d51f022b8ee Introduce SQL function to clip an area to a stretch
Tom Gottfried <tom@intevation.de>
parents:
diff changeset
30 -- Get coordinates of location codes
2373
4aabbf324e55 Fix cutting of axis segment between two distance marks
Tom Gottfried <tom@intevation.de>
parents: 2232
diff changeset
31 points_geog AS (
1629
9d51f022b8ee Introduce SQL function to clip an area to a stretch
Tom Gottfried <tom@intevation.de>
parents:
diff changeset
32 SELECT geom FROM waterway.distance_marks_virtual
2373
4aabbf324e55 Fix cutting of axis segment between two distance marks
Tom Gottfried <tom@intevation.de>
parents: 2232
diff changeset
33 WHERE location_code = lower(stretch)
4aabbf324e55 Fix cutting of axis segment between two distance marks
Tom Gottfried <tom@intevation.de>
parents: 2232
diff changeset
34 OR location_code = upper(stretch)),
1629
9d51f022b8ee Introduce SQL function to clip an area to a stretch
Tom Gottfried <tom@intevation.de>
parents:
diff changeset
35 utm_zone AS (
9d51f022b8ee Introduce SQL function to clip an area to a stretch
Tom Gottfried <tom@intevation.de>
parents:
diff changeset
36 -- Find best matchting UTM zone
2373
4aabbf324e55 Fix cutting of axis segment between two distance marks
Tom Gottfried <tom@intevation.de>
parents: 2232
diff changeset
37 SELECT best_utm(ST_Collect(geom::geometry)) AS z
4aabbf324e55 Fix cutting of axis segment between two distance marks
Tom Gottfried <tom@intevation.de>
parents: 2232
diff changeset
38 FROM points_geog),
1629
9d51f022b8ee Introduce SQL function to clip an area to a stretch
Tom Gottfried <tom@intevation.de>
parents:
diff changeset
39 axis AS (
9d51f022b8ee Introduce SQL function to clip an area to a stretch
Tom Gottfried <tom@intevation.de>
parents:
diff changeset
40 -- Transform and sew together contiguous axis chunks
9d51f022b8ee Introduce SQL function to clip an area to a stretch
Tom Gottfried <tom@intevation.de>
parents:
diff changeset
41 SELECT ST_LineMerge(ST_Collect(ST_Transform(
9d51f022b8ee Introduce SQL function to clip an area to a stretch
Tom Gottfried <tom@intevation.de>
parents:
diff changeset
42 wtwaxs::geometry, z))) AS wtwaxs
9d51f022b8ee Introduce SQL function to clip an area to a stretch
Tom Gottfried <tom@intevation.de>
parents:
diff changeset
43 FROM waterway.waterway_axis, utm_zone),
9d51f022b8ee Introduce SQL function to clip an area to a stretch
Tom Gottfried <tom@intevation.de>
parents:
diff changeset
44 -- In order to guarantee the following ST_Covers to work,
9d51f022b8ee Introduce SQL function to clip an area to a stretch
Tom Gottfried <tom@intevation.de>
parents:
diff changeset
45 -- snap distance mark coordinates to axis
2373
4aabbf324e55 Fix cutting of axis segment between two distance marks
Tom Gottfried <tom@intevation.de>
parents: 2232
diff changeset
46 points AS (
1629
9d51f022b8ee Introduce SQL function to clip an area to a stretch
Tom Gottfried <tom@intevation.de>
parents:
diff changeset
47 SELECT ST_ClosestPoint(
9d51f022b8ee Introduce SQL function to clip an area to a stretch
Tom Gottfried <tom@intevation.de>
parents:
diff changeset
48 wtwaxs,
2373
4aabbf324e55 Fix cutting of axis segment between two distance marks
Tom Gottfried <tom@intevation.de>
parents: 2232
diff changeset
49 ST_Transform(points_geog.geom::geometry, z)) AS geom
4aabbf324e55 Fix cutting of axis segment between two distance marks
Tom Gottfried <tom@intevation.de>
parents: 2232
diff changeset
50 FROM axis, points_geog, utm_zone),
1629
9d51f022b8ee Introduce SQL function to clip an area to a stretch
Tom Gottfried <tom@intevation.de>
parents:
diff changeset
51 axis_segment AS (
9d51f022b8ee Introduce SQL function to clip an area to a stretch
Tom Gottfried <tom@intevation.de>
parents:
diff changeset
52 -- select the contiguous axis on which distance marks lie
9d51f022b8ee Introduce SQL function to clip an area to a stretch
Tom Gottfried <tom@intevation.de>
parents:
diff changeset
53 SELECT line
9d51f022b8ee Introduce SQL function to clip an area to a stretch
Tom Gottfried <tom@intevation.de>
parents:
diff changeset
54 FROM (
9d51f022b8ee Introduce SQL function to clip an area to a stretch
Tom Gottfried <tom@intevation.de>
parents:
diff changeset
55 SELECT (ST_Dump(wtwaxs)).geom AS line
9d51f022b8ee Introduce SQL function to clip an area to a stretch
Tom Gottfried <tom@intevation.de>
parents:
diff changeset
56 FROM axis) AS lines,
2373
4aabbf324e55 Fix cutting of axis segment between two distance marks
Tom Gottfried <tom@intevation.de>
parents: 2232
diff changeset
57 (SELECT ST_Collect(points.geom) AS pts
4aabbf324e55 Fix cutting of axis segment between two distance marks
Tom Gottfried <tom@intevation.de>
parents: 2232
diff changeset
58 FROM points) AS points
1723
50548a6df009 Fixed fix of fix.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 1722
diff changeset
59 WHERE ST_Covers(ST_Buffer(lines.line, 0.0001), points.pts)),
1629
9d51f022b8ee Introduce SQL function to clip an area to a stretch
Tom Gottfried <tom@intevation.de>
parents:
diff changeset
60 axis_substring AS (
1811
c21f72775f6b Fix numerical problems in stretch area generation
Tom Gottfried <tom@intevation.de>
parents: 1723
diff changeset
61 -- Use linear referencing to clip axis between distance marks.
c21f72775f6b Fix numerical problems in stretch area generation
Tom Gottfried <tom@intevation.de>
parents: 1723
diff changeset
62 -- Simplification is used to work-around the problem, that
c21f72775f6b Fix numerical problems in stretch area generation
Tom Gottfried <tom@intevation.de>
parents: 1723
diff changeset
63 -- ST_LineSubstring might generate very small line segments at an
c21f72775f6b Fix numerical problems in stretch area generation
Tom Gottfried <tom@intevation.de>
parents: 1723
diff changeset
64 -- end of the resulting linestring, that significantly differ from
c21f72775f6b Fix numerical problems in stretch area generation
Tom Gottfried <tom@intevation.de>
parents: 1723
diff changeset
65 -- the direction of the input linestring due to finite precision
c21f72775f6b Fix numerical problems in stretch area generation
Tom Gottfried <tom@intevation.de>
parents: 1723
diff changeset
66 -- of the calculation. The generated small segment of the
c21f72775f6b Fix numerical problems in stretch area generation
Tom Gottfried <tom@intevation.de>
parents: 1723
diff changeset
67 -- resulting line leads to unexpected results of the buffer with
c21f72775f6b Fix numerical problems in stretch area generation
Tom Gottfried <tom@intevation.de>
parents: 1723
diff changeset
68 -- endcap=flat in the CTE below.
c21f72775f6b Fix numerical problems in stretch area generation
Tom Gottfried <tom@intevation.de>
parents: 1723
diff changeset
69 SELECT ST_SimplifyPreserveTopology(ST_LineSubstring(
2373
4aabbf324e55 Fix cutting of axis segment between two distance marks
Tom Gottfried <tom@intevation.de>
parents: 2232
diff changeset
70 axis_segment.line, min(fractions.f), max(fractions.f)),
4aabbf324e55 Fix cutting of axis segment between two distance marks
Tom Gottfried <tom@intevation.de>
parents: 2232
diff changeset
71 0.0001) AS line
4aabbf324e55 Fix cutting of axis segment between two distance marks
Tom Gottfried <tom@intevation.de>
parents: 2232
diff changeset
72 FROM axis_segment, LATERAL (
4aabbf324e55 Fix cutting of axis segment between two distance marks
Tom Gottfried <tom@intevation.de>
parents: 2232
diff changeset
73 SELECT ST_LineLocatePoint(axis_segment.line, points.geom) AS f
4aabbf324e55 Fix cutting of axis segment between two distance marks
Tom Gottfried <tom@intevation.de>
parents: 2232
diff changeset
74 FROM points) AS fractions
4aabbf324e55 Fix cutting of axis segment between two distance marks
Tom Gottfried <tom@intevation.de>
parents: 2232
diff changeset
75 GROUP BY axis_segment.line),
2232
7936b46a88d4 Handle invalid multipolygons in area generation from stretch
Tom Gottfried <tom@intevation.de>
parents: 1983
diff changeset
76 area_subset AS (
7936b46a88d4 Handle invalid multipolygons in area generation from stretch
Tom Gottfried <tom@intevation.de>
parents: 1983
diff changeset
77 -- In case area is a multipolygon, process the union of those
7936b46a88d4 Handle invalid multipolygons in area generation from stretch
Tom Gottfried <tom@intevation.de>
parents: 1983
diff changeset
78 -- polygons, which intersect with the axis. The union is to avoid
7936b46a88d4 Handle invalid multipolygons in area generation from stretch
Tom Gottfried <tom@intevation.de>
parents: 1983
diff changeset
79 -- problems with invalid/self-intersecting multipolygons
7936b46a88d4 Handle invalid multipolygons in area generation from stretch
Tom Gottfried <tom@intevation.de>
parents: 1983
diff changeset
80 SELECT ST_Union(a_dmp.geom) AS area
7936b46a88d4 Handle invalid multipolygons in area generation from stretch
Tom Gottfried <tom@intevation.de>
parents: 1983
diff changeset
81 FROM axis_substring, utm_zone,
7936b46a88d4 Handle invalid multipolygons in area generation from stretch
Tom Gottfried <tom@intevation.de>
parents: 1983
diff changeset
82 ST_Dump(ST_Transform(area, z)) AS a_dmp
7936b46a88d4 Handle invalid multipolygons in area generation from stretch
Tom Gottfried <tom@intevation.de>
parents: 1983
diff changeset
83 WHERE ST_Intersects(a_dmp.geom, axis_substring.line)
7936b46a88d4 Handle invalid multipolygons in area generation from stretch
Tom Gottfried <tom@intevation.de>
parents: 1983
diff changeset
84 ),
2398
8481e6266691 Fix corner case in area generation from stretch
Tom Gottfried <tom@intevation.de>
parents: 2373
diff changeset
85 rotated_ends AS (
8481e6266691 Fix corner case in area generation from stretch
Tom Gottfried <tom@intevation.de>
parents: 2373
diff changeset
86 SELECT ST_Collect(ST_Scale(
8481e6266691 Fix corner case in area generation from stretch
Tom Gottfried <tom@intevation.de>
parents: 2373
diff changeset
87 ST_Translate(e,
8481e6266691 Fix corner case in area generation from stretch
Tom Gottfried <tom@intevation.de>
parents: 2373
diff changeset
88 (ST_X(p1) - ST_X(p2)) / 2,
8481e6266691 Fix corner case in area generation from stretch
Tom Gottfried <tom@intevation.de>
parents: 2373
diff changeset
89 (ST_Y(p1) - ST_Y(p2)) / 2),
8481e6266691 Fix corner case in area generation from stretch
Tom Gottfried <tom@intevation.de>
parents: 2373
diff changeset
90 ST_Point(d, d), p1)) AS blade
8481e6266691 Fix corner case in area generation from stretch
Tom Gottfried <tom@intevation.de>
parents: 2373
diff changeset
91 FROM axis_substring, area_subset,
8481e6266691 Fix corner case in area generation from stretch
Tom Gottfried <tom@intevation.de>
parents: 2373
diff changeset
92 LATERAL (SELECT i, ST_PointN(line, i) AS p1
8481e6266691 Fix corner case in area generation from stretch
Tom Gottfried <tom@intevation.de>
parents: 2373
diff changeset
93 FROM (VALUES (1), (-1)) AS idx (i)) AS ep,
8481e6266691 Fix corner case in area generation from stretch
Tom Gottfried <tom@intevation.de>
parents: 2373
diff changeset
94 ST_Rotate(ST_PointN(line, i*2), pi()/2, p1) AS ep2 (p2),
8481e6266691 Fix corner case in area generation from stretch
Tom Gottfried <tom@intevation.de>
parents: 2373
diff changeset
95 ST_Makeline(p1, p2) AS e (e),
8481e6266691 Fix corner case in area generation from stretch
Tom Gottfried <tom@intevation.de>
parents: 2373
diff changeset
96 LATERAL (SELECT (ST_MaxDistance(p1, area) / ST_Length(e))
8481e6266691 Fix corner case in area generation from stretch
Tom Gottfried <tom@intevation.de>
parents: 2373
diff changeset
97 * 2) AS d (d)),
1629
9d51f022b8ee Introduce SQL function to clip an area to a stretch
Tom Gottfried <tom@intevation.de>
parents:
diff changeset
98 range_area AS (
2398
8481e6266691 Fix corner case in area generation from stretch
Tom Gottfried <tom@intevation.de>
parents: 2373
diff changeset
99 -- Split area by orthogonal lines at the ends of the clipped axis
8481e6266691 Fix corner case in area generation from stretch
Tom Gottfried <tom@intevation.de>
parents: 2373
diff changeset
100 SELECT (ST_Dump(ST_CollectionExtract(
8481e6266691 Fix corner case in area generation from stretch
Tom Gottfried <tom@intevation.de>
parents: 2373
diff changeset
101 ST_Split(area, blade), 3))).geom
8481e6266691 Fix corner case in area generation from stretch
Tom Gottfried <tom@intevation.de>
parents: 2373
diff changeset
102 FROM area_subset, rotated_ends)
1983
f9f1babe52ae Fix area generation from multipolygon input
Tom Gottfried <tom@intevation.de>
parents: 1811
diff changeset
103 -- From the polygons returned by the last CTE, select only those
1629
9d51f022b8ee Introduce SQL function to clip an area to a stretch
Tom Gottfried <tom@intevation.de>
parents:
diff changeset
104 -- around the clipped axis
2398
8481e6266691 Fix corner case in area generation from stretch
Tom Gottfried <tom@intevation.de>
parents: 2373
diff changeset
105 SELECT ST_Multi(ST_Union(ST_Transform(range_area.geom, ST_SRID(area))))
1629
9d51f022b8ee Introduce SQL function to clip an area to a stretch
Tom Gottfried <tom@intevation.de>
parents:
diff changeset
106 FROM axis_substring, range_area
2398
8481e6266691 Fix corner case in area generation from stretch
Tom Gottfried <tom@intevation.de>
parents: 2373
diff changeset
107 WHERE ST_Intersects(ST_Buffer(range_area.geom, -0.0001),
8481e6266691 Fix corner case in area generation from stretch
Tom Gottfried <tom@intevation.de>
parents: 2373
diff changeset
108 axis_substring.line)
1629
9d51f022b8ee Introduce SQL function to clip an area to a stretch
Tom Gottfried <tom@intevation.de>
parents:
diff changeset
109 $$
9d51f022b8ee Introduce SQL function to clip an area to a stretch
Tom Gottfried <tom@intevation.de>
parents:
diff changeset
110 LANGUAGE sql;