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annotate schema/isrs_functions.sql @ 1720:29a0fe218af9

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Add missing license header
author Tom Gottfried <tom@intevation.de>
date Tue, 08 Jan 2019 19:55:15 +0100
parents 6646ba22c94a
children cfaa1291294c
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1720
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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 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 -- Clip an area to a stretch given by a pair of ISRS location codes.
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16 -- Uses the table waterway.distance_marks_virtual to map ISRS location codes
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17 -- to their geo-location and the table waterway.waterway_axis to retrieve
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18 -- perpendicular direction at these geo-locations.
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19 -- Distance marks are assumed to be near the axis and the area passed as
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20 -- argument is assumed to intersect with the axis
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21 -- (use e.g. waterway area or fairway dimensions).
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22 CREATE OR REPLACE FUNCTION ISRSrange_area(
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23 stretch isrsrange,
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24 area geometry
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25 ) RETURNS geometry
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26 AS $$
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27 WITH
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28 -- Get coordinates of location codes
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29 from_geog AS (
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30 SELECT geom FROM waterway.distance_marks_virtual
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31 WHERE location_code = lower(stretch)),
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32 to_geog AS (
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33 SELECT geom FROM waterway.distance_marks_virtual
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34 WHERE location_code = upper(stretch)),
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35 utm_zone AS (
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36 -- Find best matchting UTM zone
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37 SELECT best_utm(ST_Collect(
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38 from_geog.geom::geometry,
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39 to_geog.geom::geometry)) AS z
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40 FROM from_geog, to_geog),
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41 axis AS (
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42 -- Transform and sew together contiguous axis chunks
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43 SELECT ST_LineMerge(ST_Collect(ST_Transform(
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44 wtwaxs::geometry, z))) AS wtwaxs
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45 FROM waterway.waterway_axis, utm_zone),
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46 -- In order to guarantee the following ST_Covers to work,
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47 -- snap distance mark coordinates to axis
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48 from_point AS (
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49 SELECT ST_ClosestPoint(
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50 wtwaxs,
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51 ST_Transform(from_geog.geom::geometry, z)) AS geom
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52 FROM axis, from_geog, utm_zone),
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53 to_point AS (
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54 SELECT ST_ClosestPoint(
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55 wtwaxs,
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56 ST_Transform(to_geog.geom::geometry, z)) AS geom
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57 FROM axis, to_geog, utm_zone),
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58 axis_segment AS (
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59 -- select the contiguous axis on which distance marks lie
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60 SELECT line
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61 FROM (
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62 SELECT (ST_Dump(wtwaxs)).geom AS line
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63 FROM axis) AS lines,
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64 (SELECT ST_Collect(st_buffer(from_point.geom, 0.0001),
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65 st_buffer(to_point.geom, 0.0001)) AS pts
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66 FROM from_point, to_point) AS points
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67 WHERE ST_intersects(lines.line, points.pts)),
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68 axis_substring AS (
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69 -- Use linear referencing to clip axis between distance marks
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70 SELECT ST_LineSubstring(
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71 axis_segment.line,
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72 ST_LineLocatePoint(axis_segment.line, from_point.geom),
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73 ST_LineLocatePoint(axis_segment.line, to_point.geom)
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74 ) AS line
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75 FROM axis_segment, from_point, to_point),
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76 range_area AS (
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77 -- Create a buffer around the clipped axis, as large as it could
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78 -- potentially be intersecting with the area polygon that
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79 -- intersects with the clipped axis. Get the intersection of that
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80 -- buffer with the area polygon, which can potentially
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81 -- be a multipolygon.
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82 SELECT (ST_Dump(ST_Intersection(
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83 ST_Buffer(
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84 axis_substring.line,
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85 ST_MaxDistance(
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86 axis_substring.line,
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87 ST_Transform(area, z)),
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88 'endcap=flat'),
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89 ST_Transform(area, z)))).geom
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90 FROM axis_substring, utm_zone)
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91 -- From the polygons returned by the last CTE, select only the one
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92 -- around the clipped axis
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93 SELECT ST_Transform(range_area.geom, ST_SRID(area))
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94 FROM axis_substring, range_area
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95 WHERE ST_Intersects(range_area.geom, axis_substring.line)
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96 $$
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97 LANGUAGE sql;