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comment unused code

pull/16/head
Peter Johnson 10 years ago
parent
commit
7bb05e1825
  1. 108
      middleware/search.js

108
middleware/search.js

@ -1,65 +1,65 @@
function deg2rad(degrees) {
return Math.PI*degrees/180;
}
// function deg2rad(degrees) {
// return Math.PI*degrees/180;
// }
function rad2deg(radians) {
return 180.0*radians/Math.PI;
}
// function rad2deg(radians) {
// return 180.0*radians/Math.PI;
// }
// Semi-axes of WGS-84 geoidal reference
var WGS84_a = 6378137.0; // Major semiaxis [m]
var WGS84_b = 6356752.3; // Minor semiaxis [m]
// // Semi-axes of WGS-84 geoidal reference
// var WGS84_a = 6378137.0; // Major semiaxis [m]
// var WGS84_b = 6356752.3; // Minor semiaxis [m]
// Earth radius at a given latitude, according to the WGS-84 ellipsoid [m]
function WGS84EarthRadius(lat){
// http://en.wikipedia.org/wiki/Earth_radius
var An = WGS84_a*WGS84_a * Math.cos(lat);
var Bn = WGS84_b*WGS84_b * Math.sin(lat);
var Ad = WGS84_a * Math.cos(lat);
var Bd = WGS84_b * Math.sin(lat);
return Math.sqrt( (An*An + Bn*Bn)/(Ad*Ad + Bd*Bd) );
}
// // Earth radius at a given latitude, according to the WGS-84 ellipsoid [m]
// function WGS84EarthRadius(lat){
// // http://en.wikipedia.org/wiki/Earth_radius
// var An = WGS84_a*WGS84_a * Math.cos(lat);
// var Bn = WGS84_b*WGS84_b * Math.sin(lat);
// var Ad = WGS84_a * Math.cos(lat);
// var Bd = WGS84_b * Math.sin(lat);
// return Math.sqrt( (An*An + Bn*Bn)/(Ad*Ad + Bd*Bd) );
// }
// Bounding box surrounding the point at given coordinates,
// assuming local approximation of Earth surface as a sphere
// of radius given by WGS84
function boundingBox(latitudeInDegrees, longitudeInDegrees, halfSideInKm) {
var lat = deg2rad(latitudeInDegrees);
var lon = deg2rad(longitudeInDegrees);
var halfSide = 1000*halfSideInKm;
// // Bounding box surrounding the point at given coordinates,
// // assuming local approximation of Earth surface as a sphere
// // of radius given by WGS84
// function boundingBox(latitudeInDegrees, longitudeInDegrees, halfSideInKm) {
// var lat = deg2rad(latitudeInDegrees);
// var lon = deg2rad(longitudeInDegrees);
// var halfSide = 1000*halfSideInKm;
// Radius of Earth at given latitude
var radius = WGS84EarthRadius(lat);
// Radius of the parallel at given latitude
var pradius = radius*Math.cos(lat);
// // Radius of Earth at given latitude
// var radius = WGS84EarthRadius(lat);
// // Radius of the parallel at given latitude
// var pradius = radius*Math.cos(lat);
var latMin = lat - halfSide/radius;
var latMax = lat + halfSide/radius;
var lonMin = lon - halfSide/pradius;
var lonMax = lon + halfSide/pradius;
// var latMin = lat - halfSide/radius;
// var latMax = lat + halfSide/radius;
// var lonMin = lon - halfSide/pradius;
// var lonMax = lon + halfSide/pradius;
return {
'bottom_left': {
'lat': rad2deg(latMin),
'lon': rad2deg(lonMin)
},
'top_right': {
'lat': rad2deg(latMax),
'lon': rad2deg(lonMax)
}
};
}
// return {
// 'bottom_left': {
// 'lat': rad2deg(latMin),
// 'lon': rad2deg(lonMin)
// },
// 'top_right': {
// 'lat': rad2deg(latMax),
// 'lon': rad2deg(lonMax)
// }
// };
// }
// middleware
function middleware(req, res, next){
req.clean = req.clean || {};
// ideally, bbox should be part of the req (and not to be calculated)
// TBD
req.clean.bbox = boundingBox(req.query.lat, req.query.lon, 20);
next();
}
// // middleware
// function middleware(req, res, next){
// req.clean = req.clean || {};
// // ideally, bbox should be part of the req (and not to be calculated)
// // TBD
// req.clean.bbox = boundingBox(req.query.lat, req.query.lon, 20);
// next();
// }
// middleware
module.exports.middleware = middleware
// // middleware
// module.exports.middleware = middleware
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