Mercurial > gemma

annotate schema/isrs_functions.sql @ 2624:9dbaf69c7a66

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Improve geoserver config to better calculate bounding boxes * Disable the use of estimated extents for the postgis storage configuration for geoserver, which is set via the gemma middleware. This way we are able to get better bounding boxes for many layers where the postgis function `ST_EstimatedExtent()` would be far off.
author Bernhard Reiter <bernhard@intevation.de>
date Wed, 13 Mar 2019 16:18:39 +0100
parents dc4fae4bdb8f
children 974122125a76
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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 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;