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2a774d6dac
Ports the similar algorithm from the shape tools plugin to c++, and utilises built in QgsDistanceArea ellipsoidal calculations to split the lines. This algorithm splits a line into multiple geodesic segments, whenever the line crosses the antimeridian (±180 degrees longitude) Splitting at the antimeridian helps the visual display of the lines in some projections. The returned geometry will always be a multi-part geometry. Whenever line segments in the input geometry cross the antimeridian, they will be split into two segments, with the latitude of the breakpoint being determined using a geodesic line connecting the points either side of this segment. The current project ellipsoid setting will be used when calculating this breakpoint. If the input geometry contains M or Z values, these will be linearly interpolated for the new vertices created at the antimeridian. Supports in-place edit mode also.
51 lines
4.2 KiB
XML
51 lines
4.2 KiB
XML
<?xml version="1.0" encoding="utf-8" ?>
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<ogr:FeatureCollection
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://ogr.maptools.org/ antimeridian_lines_split.xsd"
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xmlns:ogr="http://ogr.maptools.org/"
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xmlns:gml="http://www.opengis.net/gml">
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<gml:boundedBy>
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<gml:Box>
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<gml:coord><gml:X>-180</gml:X><gml:Y>-63.73125193527754</gml:Y></gml:coord>
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<gml:coord><gml:X>180</gml:X><gml:Y>62.5112951089447</gml:Y></gml:coord>
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</gml:Box>
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</gml:boundedBy>
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<gml:featureMember>
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<ogr:antimeridian_lines_split fid="antimeridian_lines.0">
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<ogr:geometryProperty><gml:MultiLineString srsName="EPSG:4326"><gml:lineStringMember><gml:LineString><gml:coordinates>-80.891554628534,62.5112951089447 -26.2185771128241,-21.706771212382 52.802689984781,39.8338700993836</gml:coordinates></gml:LineString></gml:lineStringMember></gml:MultiLineString></ogr:geometryProperty>
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<ogr:pk>1</ogr:pk>
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</ogr:antimeridian_lines_split>
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</gml:featureMember>
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<gml:featureMember>
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<ogr:antimeridian_lines_split fid="antimeridian_lines.1">
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<ogr:geometryProperty><gml:MultiLineString srsName="EPSG:4326"><gml:lineStringMember><gml:LineString><gml:coordinates>107.475667500491,60.0670531623558 106.811623239167,-46.1399448949947 154.180113880308,23.1390106826322 154.180113880308,23.1390106826322</gml:coordinates></gml:LineString></gml:lineStringMember></gml:MultiLineString></ogr:geometryProperty>
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<ogr:pk>2</ogr:pk>
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</ogr:antimeridian_lines_split>
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</gml:featureMember>
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<gml:featureMember>
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<ogr:antimeridian_lines_split fid="antimeridian_lines.2">
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<ogr:geometryProperty><gml:MultiLineString srsName="EPSG:4326"><gml:lineStringMember><gml:LineString><gml:coordinates>135.808222650333,55.5956988168508 180.0,61.4742159088028</gml:coordinates></gml:LineString></gml:lineStringMember><gml:lineStringMember><gml:LineString><gml:coordinates>-180.0,61.4742159088028 -150.925560516874,56.4614475462057</gml:coordinates></gml:LineString></gml:lineStringMember></gml:MultiLineString></ogr:geometryProperty>
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<ogr:pk>3</ogr:pk>
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</ogr:antimeridian_lines_split>
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</gml:featureMember>
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<gml:featureMember>
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<ogr:antimeridian_lines_split fid="antimeridian_lines.3">
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<ogr:geometryProperty><gml:MultiLineString srsName="EPSG:4326"><gml:lineStringMember><gml:LineString><gml:coordinates>129.831824298413,-56.9474822647808 180.0,-63.7312519352775</gml:coordinates></gml:LineString></gml:lineStringMember><gml:lineStringMember><gml:LineString><gml:coordinates>-180.0,-63.7312519352775 -150.482864342658,-58.1353091353605</gml:coordinates></gml:LineString></gml:lineStringMember></gml:MultiLineString></ogr:geometryProperty>
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<ogr:pk>4</ogr:pk>
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</ogr:antimeridian_lines_split>
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</gml:featureMember>
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<gml:featureMember>
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<ogr:antimeridian_lines_split fid="antimeridian_lines.4">
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<ogr:geometryProperty><gml:MultiLineString srsName="EPSG:4326"><gml:lineStringMember><gml:LineString><gml:coordinates>137.800355434306,-52.6123900774682 147.539671267064,-12.4080274655396 180.0,43.2521377014247</gml:coordinates></gml:LineString></gml:lineStringMember><gml:lineStringMember><gml:LineString><gml:coordinates>-180.0,43.2521377014247 -164.649141917578,54.5823408082887</gml:coordinates></gml:LineString></gml:lineStringMember></gml:MultiLineString></ogr:geometryProperty>
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<ogr:pk>5</ogr:pk>
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</ogr:antimeridian_lines_split>
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</gml:featureMember>
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<gml:featureMember>
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<ogr:antimeridian_lines_split fid="antimeridian_lines.5">
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<ogr:geometryProperty><gml:MultiLineString srsName="EPSG:4326"><gml:lineStringMember><gml:LineString><gml:coordinates>143.998101873334,42.0078449653839 158.164379448254,33.2620367778 180.0,-12.246360544555</gml:coordinates></gml:LineString></gml:lineStringMember><gml:lineStringMember><gml:LineString><gml:coordinates>-180.0,-12.246360544555 -154.90982608482,-49.5548177386129 -139.415459987251,28.9038080381852</gml:coordinates></gml:LineString></gml:lineStringMember></gml:MultiLineString></ogr:geometryProperty>
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<ogr:pk>6</ogr:pk>
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</ogr:antimeridian_lines_split>
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</gml:featureMember>
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</ogr:FeatureCollection>
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