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65 lines
1.9 KiB
65 lines
1.9 KiB
// function deg2rad(degrees) { |
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// return Math.PI*degrees/180; |
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// } |
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// function rad2deg(radians) { |
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// return 180.0*radians/Math.PI; |
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// } |
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// // Semi-axes of WGS-84 geoidal reference |
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// var WGS84_a = 6378137.0; // Major semiaxis [m] |
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// var WGS84_b = 6356752.3; // Minor semiaxis [m] |
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// // Earth radius at a given latitude, according to the WGS-84 ellipsoid [m] |
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// function WGS84EarthRadius(lat){ |
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// // http://en.wikipedia.org/wiki/Earth_radius |
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// var An = WGS84_a*WGS84_a * Math.cos(lat); |
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// var Bn = WGS84_b*WGS84_b * Math.sin(lat); |
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// var Ad = WGS84_a * Math.cos(lat); |
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// var Bd = WGS84_b * Math.sin(lat); |
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// return Math.sqrt( (An*An + Bn*Bn)/(Ad*Ad + Bd*Bd) ); |
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// } |
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// // Bounding box surrounding the point at given coordinates, |
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// // assuming local approximation of Earth surface as a sphere |
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// // of radius given by WGS84 |
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// function boundingBox(latitudeInDegrees, longitudeInDegrees, halfSideInKm) { |
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// var lat = deg2rad(latitudeInDegrees); |
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// var lon = deg2rad(longitudeInDegrees); |
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// var halfSide = 1000*halfSideInKm; |
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// // Radius of Earth at given latitude |
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// var radius = WGS84EarthRadius(lat); |
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// // Radius of the parallel at given latitude |
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// var pradius = radius*Math.cos(lat); |
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// var latMin = lat - halfSide/radius; |
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// var latMax = lat + halfSide/radius; |
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// var lonMin = lon - halfSide/pradius; |
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// var lonMax = lon + halfSide/pradius; |
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// return { |
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// 'bottom_left': { |
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// 'lat': rad2deg(latMin), |
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// 'lon': rad2deg(lonMin) |
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// }, |
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// 'top_right': { |
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// 'lat': rad2deg(latMax), |
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// 'lon': rad2deg(lonMax) |
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// } |
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// }; |
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// } |
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// // middleware |
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// function middleware(req, res, next){ |
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// req.clean = req.clean || {}; |
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// // ideally, bbox should be part of the req (and not to be calculated) |
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// // TBD |
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// req.clean.bbox = boundingBox(req.query.lat, req.query.lon, 20); |
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// next(); |
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// } |
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// // middleware |
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// module.exports.middleware = middleware
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