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annotate schema/isrs_functions.sql @ 2535:73c8762cee60

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Stretch area generation: Throw errors instead of returning NULL It is now an error if not both distance marks for the given stretch can be found or no contiguous axis can be constructed between them.
author Tom Gottfried <tom@intevation.de>
date Thu, 07 Mar 2019 12:20:00 +0100
parents 79f4a20e31c2
children dc4fae4bdb8f
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1 -- This is Free Software under GNU Affero General Public License v >= 3.0
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2 -- without warranty, see README.md and license for details.
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3
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4 -- SPDX-License-Identifier: AGPL-3.0-or-later
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5 -- License-Filename: LICENSES/AGPL-3.0.txt
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6
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7 -- Copyright (C) 2018, 2019 by via donau
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8 -- – Österreichische Wasserstraßen-Gesellschaft mbH
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9 -- Software engineering by Intevation GmbH
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10
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11 -- Author(s):
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12 -- * Tom Gottfried <tom@intevation.de>
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13 -- * Sascha Wilde <wilde@intevation.de>
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14
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15 CREATE OR REPLACE FUNCTION best_utm(stretch isrsrange) RETURNS integer
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16 AS $$
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17 SELECT best_utm(ST_Collect(geom::geometry))
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18 FROM waterway.distance_marks_virtual
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19 WHERE location_code IN (lower(stretch), upper(stretch))
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20 $$
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21 LANGUAGE sql
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22 STABLE PARALLEL SAFE;
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23
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24 -- Return a multipoint with coordinates of stretch end points
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25 CREATE OR REPLACE FUNCTION ISRSrange_points(
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26 stretch isrsrange
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27 ) RETURNS geometry
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28 AS $$
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29 DECLARE result_geom geometry;
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30 BEGIN
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31 SELECT geom
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32 INTO STRICT result_geom
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33 FROM (
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34 SELECT ST_Collect(CAST(geom AS geometry)) AS geom
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35 FROM waterway.distance_marks_virtual
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36 WHERE location_code IN(lower(stretch), upper(stretch))) AS pts
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37 -- Ensure both have been found
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38 WHERE ST_NumGeometries(geom) = 2;
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39
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40 RETURN result_geom;
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41 END;
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42 $$
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43 LANGUAGE plpgsql
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44 STABLE PARALLEL SAFE;
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45
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46 -- Clip waterway axis to a stretch given by a pair of ISRS location codes.
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47 -- Uses the table waterway.distance_marks_virtual to map ISRS location codes
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48 -- to their geo-location.
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49 -- Distance marks are assumed to be near the axis.
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50 CREATE OR REPLACE FUNCTION ISRSrange_axis(
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51 stretch isrsrange,
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52 tolerance float
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53 -- in m, up to which linestrings will be connected at their boundary
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54 ) RETURNS geometry
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55 AS $$
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56 DECLARE result_geom geometry;
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57 BEGIN
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58 WITH RECURSIVE
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59 utm_zone AS (
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60 -- Find best matchting UTM zone
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61 SELECT best_utm(stretch) AS z),
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62 axis AS (
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63 SELECT id, ST_Transform(wtwaxs::geometry, z) AS wtwaxs
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64 FROM waterway.waterway_axis, utm_zone),
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65 -- In order to guarantee the following ST_Covers to work,
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66 -- snap distance mark coordinates to axis
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67 points AS (
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68 SELECT ST_ClosestPoint(
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69 wtwaxs,
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70 ST_Transform(geom, z)) AS geom
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71 FROM ST_Dump(ISRSrange_points(stretch)), utm_zone, (
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72 SELECT ST_Collect(wtwaxs) AS wtwaxs
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73 FROM axis) AS ax),
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74 axis_snapped AS (
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75 -- Iteratively connect non-contiguous axis chunks
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76 -- to find the contiguous axis on which given distance marks lie
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77 (SELECT ARRAY[id] AS ids, wtwaxs
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78 FROM axis, points
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79 WHERE ST_Intersects(
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80 ST_Buffer(axis.wtwaxs, 0.0001), points.geom)
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81 FETCH FIRST ROW ONLY)
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82 UNION
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83 -- Connect endpoint of next linestring with closest
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84 -- endpoint of merged linestring until a contiguous
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85 -- linestring connecting both distance marks is build up
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86 (SELECT refids || id,
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87 ST_LineMerge(ST_Collect(ARRAY(
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88 -- Linestring build up so far
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89 SELECT refgeom
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90 UNION
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91 -- Fill eventual gap
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92 SELECT ST_ShortestLine(
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93 ST_Boundary(refgeom), ST_Boundary(geom))
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94 UNION
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95 -- Linestring to be added
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96 SELECT geom)))
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97 FROM axis_snapped AS axis_snapped (refids, refgeom),
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98 axis AS axis (id, geom),
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99 (SELECT ST_Collect(points.geom) AS pts
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100 FROM points) AS points
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101 WHERE id <> ALL(refids)
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102 AND ST_DWithin(
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103 ST_Boundary(refgeom), ST_Boundary(geom), tolerance)
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104 AND NOT ST_Covers(ST_Buffer(refgeom, 0.0001), points.pts)
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105 ORDER BY ST_Distance(ST_Boundary(refgeom), ST_Boundary(geom))
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106 FETCH FIRST ROW ONLY)),
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107 axis_segment AS (
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108 -- Fetch end result from snapping
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109 SELECT wtwaxs AS line
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110 FROM axis_snapped,
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111 (SELECT ST_Collect(points.geom) AS pts
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112 FROM points) AS points
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113 -- Return end result only if both distance marks were connected
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114 WHERE ST_Covers(ST_Buffer(wtwaxs, 0.0001), points.pts))
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115 -- Use linear referencing to clip axis between distance marks.
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116 -- Simplification is used to work-around the problem, that
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117 -- ST_LineSubstring might generate very small line segments at an
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118 -- end of the resulting linestring, that significantly differ from
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119 -- the direction of the input linestring due to finite precision
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120 -- of the calculation. The generated small segment of the
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121 -- resulting line leads to unexpected results of the buffer with
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122 -- endcap=flat in the CTE below.
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123 SELECT ST_SimplifyPreserveTopology(ST_LineSubstring(
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124 axis_segment.line, min(fractions.f), max(fractions.f)),
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125 0.0001) AS line
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126 INTO STRICT result_geom
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127 FROM axis_segment, LATERAL (
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128 SELECT ST_LineLocatePoint(axis_segment.line, points.geom) AS f
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129 FROM points) AS fractions
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130 GROUP BY axis_segment.line;
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131
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132 RETURN result_geom;
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133 END;
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134 $$
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135 LANGUAGE plpgsql
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136 STABLE PARALLEL SAFE;
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137
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138 -- Clip an area to a stretch given by a pair of ISRS location codes.
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139 -- Uses ISRSrange_axis() to retrieve the respective clipped axis used to find
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140 -- perpendicular direction at geo-locations of ISRS codes.
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141 -- The area passed as argument is assumed to intersect with the axis
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142 -- (use e.g. waterway area or fairway dimensions).
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143 -- If a multipolygon is passed, the union of the polygons intersecting with the
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144 -- relevant part of the axis is used for clipping.
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145 CREATE OR REPLACE FUNCTION ISRSrange_area(
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146 stretch isrsrange,
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147 area geometry
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148 ) RETURNS geometry
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149 AS $$
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150 WITH
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151 axis_substring AS (
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152 SELECT ISRSrange_axis(stretch, 5) AS line),
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153 utm_zone AS (
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154 SELECT best_utm(stretch) AS z),
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155 area_subset AS (
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156 -- In case area is a multipolygon, process the union of those
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157 -- polygons, which intersect with the axis. The union is to avoid
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158 -- problems with invalid/self-intersecting multipolygons
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159 SELECT ST_Union(a_dmp.geom) AS area
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160 FROM axis_substring, utm_zone, LATERAL (
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161 SELECT ST_MakeValid(ST_Transform(geom, z)) AS geom
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162 FROM ST_Dump(area)) AS a_dmp
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163 WHERE ST_Intersects(a_dmp.geom, axis_substring.line)
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164 ),
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165 rotated_ends AS (
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166 SELECT ST_Collect(ST_Scale(
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167 ST_Translate(e,
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168 (ST_X(p1) - ST_X(p2)) / 2,
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169 (ST_Y(p1) - ST_Y(p2)) / 2),
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170 ST_Point(d, d), p1)) AS blade
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171 FROM axis_substring, area_subset,
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172 LATERAL (SELECT i, ST_PointN(line, i) AS p1
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173 FROM (VALUES (1), (-1)) AS idx (i)) AS ep,
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174 ST_Rotate(ST_PointN(line, i*2), pi()/2, p1) AS ep2 (p2),
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175 ST_Makeline(p1, p2) AS e (e),
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176 LATERAL (SELECT (ST_MaxDistance(p1, area) / ST_Length(e))
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177 * 2) AS d (d)),
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178 range_area AS (
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179 -- Split area by orthogonal lines at the ends of the clipped axis
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180 SELECT (ST_Dump(ST_CollectionExtract(
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181 ST_Split(area, blade), 3))).geom
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182 FROM area_subset, rotated_ends)
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183 -- From the polygons returned by the last CTE, select only those
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184 -- around the clipped axis
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185 SELECT ST_Multi(ST_Transform(ST_Union(range_area.geom), ST_SRID(area)))
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186 FROM axis_substring, range_area
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187 WHERE ST_Intersects(ST_Buffer(range_area.geom, -0.0001),
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188 axis_substring.line)
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189 $$
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190 LANGUAGE sql;