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t = db.geo_s2meridian;
t.drop();
t.ensureIndex({geo: "2dsphere"});
/*
* Test 1: check that intersection works on the meridian. We insert a line
* that crosses the meridian, and then run a geoIntersect with a line
* that runs along the meridian.
*/
meridianCrossingLine = {
geo: {
type: "LineString",
coordinates: [
[-178.0, 10.0],
[178.0, 10.0]]
}
};
t.insert(meridianCrossingLine);
assert(! db.getLastError());
lineAlongMeridian = {
type: "LineString",
coordinates: [
[180.0, 11.0],
[180.0, 9.0]
]
}
result = t.find({geo: {$geoIntersects: {$geometry: lineAlongMeridian}}});
assert.eq(result.count(), 1);
t.drop();
t.ensureIndex({geo: "2dsphere"});
/*
* Test 2: check that within work across the meridian. We insert points
* on the meridian, and immediately on either side, and confirm that a poly
* covering all of them returns them all.
*/
pointOnNegativeSideOfMeridian = {
geo: {
type: "Point",
coordinates: [-179.0, 1.0]
}
};
pointOnMeridian = {
geo: {
type: "Point",
coordinates: [180.0, 1.0]
}
};
pointOnPositiveSideOfMeridian = {
geo: {
type: "Point",
coordinates: [179.0, 1.0]
}
};
t.insert(pointOnMeridian);
t.insert(pointOnNegativeSideOfMeridian);
t.insert(pointOnPositiveSideOfMeridian);
meridianCrossingPoly = {
type: "Polygon",
coordinates: [
[[-178.0, 10.0], [178.0, 10.0], [178.0, -10.0], [-178.0, -10.0], [-178.0, 10.0]]
]
};
result = t.find({geo: {$geoWithin: {$geometry: meridianCrossingPoly}}});
assert.eq(result.count(), 3);
t.drop();
t.ensureIndex({geo: "2dsphere"});
/*
* Test 3: Check that near works around the meridian. Insert two points, one
* closer, but across the meridian, and confirm they both come back, and
* that the order is correct.
*/
pointOnNegativeSideOfMerid = {
name: "closer",
geo: {
type: "Point",
coordinates: [-179.0, 0.0]
}
};
pointOnPositiveSideOfMerid = {
name: "farther",
geo: {
type: "Point",
coordinates: [176.0, 0.0]
}
};
t.insert(pointOnNegativeSideOfMerid);
t.insert(pointOnPositiveSideOfMerid);
pointOnPositiveSideOfMeridian = {
type: "Point",
coordinates: [179.0, 0.0]
};
result = t.find({geo: {$geoNear: pointOnPositiveSideOfMeridian}});
assert.eq(result.count(), 2);
assert.eq(result[0].name, "closer");
assert.eq(result[1].name, "farther");
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