Mercurial > gemma
annotate schema/isrs_functions.sql @ 5520:05db984d3db1
Improve performance of bottleneck area calculation
Avoid buffer calculations by replacing them with simple distance comparisons
and calculate the boundary of the result geometry only once per iteration.
In some edge cases with very large numbers of iterations, this reduced
the runtime of a bottleneck import by a factor of more than twenty.
author | Tom Gottfried <tom@intevation.de> |
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date | Thu, 21 Oct 2021 19:50:39 +0200 |
parents | 68358e4603c8 |
children | 3cfbc5769e8b |
rev | line source |
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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 -- Returns the axis geometry transformed to the best matching UTM zone. |
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51 CREATE OR REPLACE FUNCTION ISRSrange_axis( |
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52 stretch isrsrange, |
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53 tolerance float |
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54 -- in m, up to which linestrings will be connected at their boundary |
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55 ) RETURNS geometry |
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56 AS $$ |
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57 DECLARE z int; |
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58 DECLARE result_geom geometry; |
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59 BEGIN |
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60 -- Find best matchting UTM zone |
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61 z = best_utm(stretch); |
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62 |
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63 CREATE TEMP TABLE axis AS |
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64 SELECT row_number() OVER () AS id, |
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65 geom AS wtwaxs, |
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66 ST_Boundary(geom) AS bdr |
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67 FROM waterway.waterway_axis, |
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68 ST_Dump(ST_Transform(wtwaxs::geometry, z)) |
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69 WHERE validity @> current_timestamp; |
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70 CREATE INDEX axs_bdr ON axis USING GiST (bdr); |
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71 ANALYZE axis; |
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72 |
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73 WITH RECURSIVE |
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74 -- In order to guarantee the following ST_Covers to work, |
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75 -- snap distance mark coordinates to axis |
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76 points0 AS ( |
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77 SELECT ST_ClosestPoint( |
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78 wtwaxs, |
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79 ST_Transform(geom, z)) AS geom |
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80 FROM ST_Dump(ISRSrange_points(stretch)), ( |
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81 SELECT ST_Collect(wtwaxs) AS wtwaxs |
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82 FROM axis) AS ax), |
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83 -- Ensure two distinct points on axis have been found |
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84 points AS ( |
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85 SELECT geom |
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86 FROM points0 |
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87 WHERE 2 = (SELECT count(DISTINCT geom) FROM points0)), |
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88 axis_snapped AS ( |
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89 -- Iteratively connect non-contiguous axis chunks |
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90 -- to find the contiguous axis on which given distance marks lie |
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91 (SELECT ARRAY[id] AS ids, wtwaxs |
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92 FROM axis, points |
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93 WHERE ST_DWithin(axis.wtwaxs, points.geom, 0.0001) |
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94 FETCH FIRST ROW ONLY) |
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95 UNION |
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96 -- Connect endpoint of next linestring with closest |
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97 -- endpoint of merged linestring until a contiguous |
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98 -- linestring connecting both distance marks is build up |
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99 (SELECT refids || id, |
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100 ST_LineMerge(ST_Collect(ARRAY( |
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101 -- Linestring build up so far |
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102 SELECT refgeom |
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103 UNION |
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104 -- Fill eventual gap |
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105 SELECT ST_ShortestLine(refbdr, bdr) |
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106 UNION |
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107 -- Linestring to be added |
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108 SELECT geom))) |
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109 FROM axis_snapped AS axis_snapped (refids, refgeom), |
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110 axis AS axis (id, geom, bdr), |
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111 ST_Boundary(refgeom) AS refbdr (refbdr) |
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112 WHERE id <> ALL(refids) |
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113 AND ST_DWithin(refbdr, bdr, tolerance) |
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114 -- Stop if refgeom goes through both distance marks |
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115 AND NOT 0.0001 >= ALL(SELECT refgeom <-> geom FROM points) |
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116 ORDER BY refbdr <-> bdr |
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117 FETCH FIRST ROW ONLY)), |
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118 axis_segment AS ( |
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119 -- Fetch end result from snapping |
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120 SELECT wtwaxs AS line |
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121 FROM axis_snapped |
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122 -- Return end result only if both distance marks were connected |
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123 WHERE 0.0001 >= ALL(SELECT wtwaxs <-> geom FROM points)) |
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124 -- Use linear referencing to clip axis between distance marks. |
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125 -- Simplification is used to work-around the problem, that |
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126 -- ST_LineSubstring might generate very small line segments at an |
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127 -- end of the resulting linestring, that significantly differ from |
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128 -- the direction of the input linestring due to finite precision |
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129 -- of the calculation. The generated small segment of the |
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130 -- resulting line would lead e.g. to unexpected results in an area |
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131 -- generated by ISRSrange_area(). |
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132 SELECT ST_SimplifyPreserveTopology(ST_LineSubstring( |
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133 axis_segment.line, min(fractions.f), max(fractions.f)), |
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134 0.0001) AS line |
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135 INTO STRICT result_geom |
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136 FROM axis_segment, LATERAL ( |
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137 SELECT ST_LineLocatePoint(axis_segment.line, points.geom) AS f |
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138 FROM points) AS fractions |
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139 GROUP BY axis_segment.line; |
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140 |
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141 -- Drop temporary table to avoid side effects on PostgreSQL's MVCC, |
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142 -- because otherwise subsequent invocations of the function will not see |
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143 -- changes on the underlying waterway.waterway_axis that might have |
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144 -- occured. |
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145 DROP TABLE axis; |
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146 |
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147 RETURN result_geom; |
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148 END; |
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149 $$ |
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150 LANGUAGE plpgsql |
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151 PARALLEL RESTRICTED; |
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152 |
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153 -- Clip an area to a stretch given by a geometry representing an axis (e.g. |
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154 -- the output of ISRSrange_axis()). |
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155 -- Clipping is done by cutting the area in perpendicular direction at |
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156 -- the ends of the given axis. |
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157 -- The area passed as argument is assumed to intersect with the axis |
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158 -- (use e.g. waterway area or fairway dimensions). |
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159 -- If a multipolygon is passed, the union of the polygons intersecting with the |
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160 -- axis is used for clipping. |
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161 CREATE OR REPLACE FUNCTION ISRSrange_area( |
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162 axis geometry, |
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163 area geometry |
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164 ) RETURNS geometry |
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165 AS $$ |
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166 DECLARE |
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167 area_subset geometry; |
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168 result_geom geometry; |
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169 BEGIN |
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170 -- In case area is a multipolygon, process the union of those |
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171 -- polygons, which intersect with the axis. The union is to avoid |
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172 -- problems with invalid/self-intersecting multipolygons |
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173 SELECT ST_Union(a_dmp.geom) |
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174 INTO STRICT area_subset |
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175 FROM (SELECT ST_MakeValid(ST_Transform(geom, ST_SRID(axis))) |
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176 FROM ST_Dump(area)) AS a_dmp (geom) |
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177 WHERE ST_Intersects(a_dmp.geom, axis) |
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178 HAVING ST_Union(a_dmp.geom) IS NOT NULL; |
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179 |
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180 WITH |
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181 rotated_ends AS ( |
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182 SELECT ST_Collect(ST_Scale( |
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183 ST_Translate(e, |
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184 (ST_X(p1) - ST_X(p2)) / 2, |
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185 (ST_Y(p1) - ST_Y(p2)) / 2), |
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186 ST_Point(d, d), p1)) AS blade |
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187 FROM (SELECT i, ST_PointN(axis, i) AS p1 |
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188 FROM (VALUES (1), (-1)) AS idx (i)) AS ep, |
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189 ST_Rotate(ST_PointN(axis, i*2), pi()/2, p1) AS ep2 (p2), |
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190 ST_Makeline(p1, p2) AS e (e), |
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191 LATERAL ( |
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192 SELECT (ST_MaxDistance(p1, area_subset) / ST_Length(e)) |
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193 * 2) AS d (d)), |
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194 range_area AS ( |
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195 -- Split area by orthogonal lines at the ends of the clipped axis |
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196 SELECT (ST_Dump(ST_CollectionExtract( |
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197 ST_Split(area_subset, blade), 3))).geom |
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198 FROM rotated_ends) |
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199 -- From the polygons returned by the last CTE, select only those |
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200 -- around the clipped axis |
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201 SELECT ST_Multi(ST_Transform(ST_Union(range_area.geom), ST_SRID(area))) |
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202 INTO result_geom |
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203 FROM range_area |
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204 WHERE ST_Intersects(ST_Buffer(range_area.geom, -0.0001), axis); |
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205 |
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206 RETURN result_geom; |
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207 END; |
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208 $$ |
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209 LANGUAGE plpgsql |
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210 STABLE PARALLEL SAFE; |
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211 |
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212 |
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213 -- Check if a given string looks like an ISRS code |
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214 CREATE OR REPLACE FUNCTION is_ISRSstring(str text) RETURNS boolean |
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215 AS $$ |
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216 BEGIN |
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217 str = upper(str); |
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218 RETURN (SELECT str SIMILAR TO '[A-Z]{2}[A-Z0-9]{13}[0-9]{5}') |
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219 AND is_country(substring(str from 1 for 2)); |
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220 END; |
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221 $$ |
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222 LANGUAGE plpgsql |
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223 IMMUTABLE PARALLEL SAFE; |