index.js

var gdal = require('gdal');

module.exports = {};
module.exports.reproject = reproject;

var dstwkt = "PROJCS['WGS 84 / Pseudo-Mercator', GEOGCS['WGS 84', DATUM['WGS_1984', SPHEROID['WGS 84',6378137,298.257223563, AUTHORITY['EPSG','7030']], AUTHORITY['EPSG','6326']], PRIMEM['Greenwich',0], UNIT['degree',0.0174532925199433], AUTHORITY['EPSG','4326']], PROJECTION['Mercator_1SP'], PARAMETER['central_meridian',0], PARAMETER['scale_factor',1], PARAMETER['false_easting',0], PARAMETER['false_northing',0], UNIT['metre',1, AUTHORITY['EPSG','9001']], EXTENSION['PROJ4','+proj=merc +a=6378137 +b=6378137 +lat_ts=0.0 +lon_0=0.0 +x_0=0.0 +y_0=0 +k=1.0 +units=m +nadgrids=@null +wktext  +no_defs'], AUTHORITY['EPSG','3857']]";
var proj4wm = "+proj=merc +a=6378137 +b=6378137 +lat_ts=0.0 +lon_0=0.0 +x_0=0.0 +y_0=0 +k=1.0 +units=m +nadgrids=@null +wktext  +no_defs";


function reproject(srcpath, dstpath, callback) {
  
  var src = gdal.open(srcpath);
  
  var width = src.rasterSize.x;
  var height = src.rasterSize.y;
  var count = src.bands.count();
  var driver = src.driver.description;
  
  var srcProjection = src.srs;
  var dstProjection = gdal.SpatialReference.fromProj4(proj4wm);
  // var dstProjection = new gdal.SpatialReference(dstwkt);
  
  var dst = gdal.open(dstpath, mode='w', driver, x_size=width, y_size=height, band_count=count);
  
  var opts = {
    src: src,
    dst: dst,
    s_srs: srcProjection,
    t_srs: dstProjection
  }
  gdal.reprojectImage(opts)
  
  return callback(null);
}