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annotate schema/isrs_functions.sql @ 2677:fe93c48f76c9 import-overview-rework

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author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Fri, 15 Mar 2019 12:04:52 +0100
parents dc4fae4bdb8f
children 974122125a76
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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 result_geom geometry;
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58 BEGIN
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59 WITH RECURSIVE
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60 utm_zone AS (
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61 -- Find best matchting UTM zone
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62 SELECT best_utm(stretch) AS z),
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63 axis AS (
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64 SELECT id, ST_Transform(wtwaxs::geometry, z) AS wtwaxs
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65 FROM waterway.waterway_axis, utm_zone),
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66 -- In order to guarantee the following ST_Covers to work,
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67 -- snap distance mark coordinates to axis
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68 points AS (
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69 SELECT ST_ClosestPoint(
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70 wtwaxs,
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71 ST_Transform(geom, z)) AS geom
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72 FROM ST_Dump(ISRSrange_points(stretch)), utm_zone, (
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73 SELECT ST_Collect(wtwaxs) AS wtwaxs
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74 FROM axis) AS ax),
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75 axis_snapped AS (
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76 -- Iteratively connect non-contiguous axis chunks
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77 -- to find the contiguous axis on which given distance marks lie
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78 (SELECT ARRAY[id] AS ids, wtwaxs
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79 FROM axis, points
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80 WHERE ST_Intersects(
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81 ST_Buffer(axis.wtwaxs, 0.0001), points.geom)
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82 FETCH FIRST ROW ONLY)
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83 UNION
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84 -- Connect endpoint of next linestring with closest
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85 -- endpoint of merged linestring until a contiguous
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86 -- linestring connecting both distance marks is build up
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87 (SELECT refids || id,
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88 ST_LineMerge(ST_Collect(ARRAY(
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89 -- Linestring build up so far
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90 SELECT refgeom
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91 UNION
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92 -- Fill eventual gap
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93 SELECT ST_ShortestLine(
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94 ST_Boundary(refgeom), ST_Boundary(geom))
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95 UNION
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96 -- Linestring to be added
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97 SELECT geom)))
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98 FROM axis_snapped AS axis_snapped (refids, refgeom),
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99 axis AS axis (id, geom),
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100 (SELECT ST_Collect(points.geom) AS pts
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101 FROM points) AS points
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102 WHERE id <> ALL(refids)
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103 AND ST_DWithin(
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104 ST_Boundary(refgeom), ST_Boundary(geom), tolerance)
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105 AND NOT ST_Covers(ST_Buffer(refgeom, 0.0001), points.pts)
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106 ORDER BY ST_Distance(ST_Boundary(refgeom), ST_Boundary(geom))
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107 FETCH FIRST ROW ONLY)),
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108 axis_segment AS (
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109 -- Fetch end result from snapping
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110 SELECT wtwaxs AS line
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111 FROM axis_snapped,
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112 (SELECT ST_Collect(points.geom) AS pts
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113 FROM points) AS points
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114 -- Return end result only if both distance marks were connected
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115 WHERE ST_Covers(ST_Buffer(wtwaxs, 0.0001), points.pts))
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116 -- Use linear referencing to clip axis between distance marks.
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117 -- Simplification is used to work-around the problem, that
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118 -- ST_LineSubstring might generate very small line segments at an
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119 -- end of the resulting linestring, that significantly differ from
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120 -- the direction of the input linestring due to finite precision
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121 -- of the calculation. The generated small segment of the
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122 -- resulting line leads to unexpected results of the buffer with
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123 -- endcap=flat in the CTE below.
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124 SELECT ST_SimplifyPreserveTopology(ST_LineSubstring(
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125 axis_segment.line, min(fractions.f), max(fractions.f)),
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126 0.0001) AS line
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127 INTO STRICT result_geom
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128 FROM axis_segment, LATERAL (
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129 SELECT ST_LineLocatePoint(axis_segment.line, points.geom) AS f
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130 FROM points) AS fractions
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131 GROUP BY axis_segment.line;
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132
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133 RETURN result_geom;
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134 END;
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135 $$
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136 LANGUAGE plpgsql
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137 STABLE PARALLEL SAFE;
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138
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139 -- Clip an area to a stretch given by a geometry representing an axis (e.g.
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140 -- the output of ISRSrange_axis()).
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141 -- Clipping is done by cutting the area in perpendicular direction at
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142 -- the ends of the given axis.
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143 -- The area passed as argument is assumed to intersect with the axis
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144 -- (use e.g. waterway area or fairway dimensions).
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145 -- If a multipolygon is passed, the union of the polygons intersecting with the
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146 -- axis is used for clipping.
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147 CREATE OR REPLACE FUNCTION ISRSrange_area(
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148 axis geometry,
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149 area geometry
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150 ) RETURNS geometry
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151 AS $$
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152 WITH
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153 area_subset AS (
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154 -- In case area is a multipolygon, process the union of those
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155 -- polygons, which intersect with the axis. The union is to avoid
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156 -- problems with invalid/self-intersecting multipolygons
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157 SELECT ST_Union(a_dmp.geom) AS area
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158 FROM (SELECT ST_MakeValid(ST_Transform(geom, ST_SRID(axis)))
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159 FROM ST_Dump(area)) AS a_dmp (geom)
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160 WHERE ST_Intersects(a_dmp.geom, axis)
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161 ),
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162 rotated_ends AS (
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163 SELECT ST_Collect(ST_Scale(
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164 ST_Translate(e,
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165 (ST_X(p1) - ST_X(p2)) / 2,
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166 (ST_Y(p1) - ST_Y(p2)) / 2),
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167 ST_Point(d, d), p1)) AS blade
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168 FROM (SELECT i, ST_PointN(axis, i) AS p1
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169 FROM (VALUES (1), (-1)) AS idx (i)) AS ep,
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170 ST_Rotate(ST_PointN(axis, i*2), pi()/2, p1) AS ep2 (p2),
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171 ST_Makeline(p1, p2) AS e (e),
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172 area_subset,
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173 LATERAL (SELECT (ST_MaxDistance(p1, area) / ST_Length(e))
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174 * 2) AS d (d)),
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175 range_area AS (
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176 -- Split area by orthogonal lines at the ends of the clipped axis
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177 SELECT (ST_Dump(ST_CollectionExtract(
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178 ST_Split(area, blade), 3))).geom
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179 FROM area_subset, rotated_ends)
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180 -- From the polygons returned by the last CTE, select only those
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181 -- around the clipped axis
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182 SELECT ST_Multi(ST_Transform(ST_Union(range_area.geom), ST_SRID(area)))
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183 FROM range_area
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184 WHERE ST_Intersects(ST_Buffer(range_area.geom, -0.0001), axis)
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185 $$
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186 LANGUAGE sql;