cheminfo / Netcdfjs
Licence: mit
Read and explore NetCDF files
Stars: ✭ 86
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netcdfjs
Read and explore NetCDF v3 files.
Installation
$ npm install netcdfjs
API Documentation
For further information about the grammar you should go to this link.
Example I: NodeJS
const fs = require('fs');
const NetCDFReader = require('netcdfjs');
// http://www.unidata.ucar.edu/software/netcdf/examples/files.html
const data = fs.readFileSync('madis-sao.nc');
var reader = new NetCDFReader(data); // read the header
reader.getDataVariable('wmoId'); // go to offset and read it
Example II: Load from URL (does not require node)
// First load the netcdfjs library as normal : <script src='./dist/netcdfjs.js'></script>
// You could use the oficial CDN: <script src='http://www.lactame.com/lib/netcdfjs/0.3.0/netcdfjs.min.js'></script>
var urlpath =
'http://www.unidata.ucar.edu/software/netcdf/examples/madis-sao.nc';
var reader;
var oReq = new XMLHttpRequest();
oReq.open('GET', urlpath, true);
oReq.responseType = 'blob';
oReq.onload = function(oEvent) {
var blob = oReq.response;
reader_url = new FileReader();
reader_url.onload = function(e) {
reader = new netcdfjs(this.result);
};
reader_url.readAsArrayBuffer(blob);
};
oReq.send(); //start process
reader.getDataVariable('wmoId'); // go to offset and read it
Example III: Client side file upload
This example creates a file input element and allows the user to select a file from their personal machine.
var reader;
var progress = document.querySelector('.percent');
function abortRead() {
reader.abort();
}
function handleFileSelect(evt) {
// Reset progress indicator on new file selection.
progress.style.width = '0%';
progress.textContent = '0%';
reader = new FileReader();
reader.onerror = errorHandler;
reader.onprogress = updateProgress;
reader.onabort = function(e) {
alert('File read cancelled');
};
reader.onloadstart = function(e) {
document.getElementById('progress_bar').className = 'loading';
};
reader.onload = function(e) {
// Ensure that the progress bar displays 100% at the end.
progress.style.width = '100%';
progress.textContent = '100%';
setTimeout("document.getElementById('progress_bar').className='';", 2000);
//var reader = new NetCDFReader(reader.result);
//replace reader with NetCDF reader
reader = new netcdfjs(this.result);
reader.getDataVariable('wmoId'); // go to offset and read it
//... your program here ..//
};
reader.readAsArrayBuffer(evt.target.files[0]);
}
// Make input element <input type="file" id="files" name="file" />
var input = document.createElement('input');
input.id = 'files';
input.type = 'file';
input.className = 'file';
document.body.appendChild(input); // put it into the DOM
// Make a Progress bar <div id="progress_bar"><div class="percent">0%</div></div>
var progress = document.createElement('div');
progress.id = 'progress_bar';
inner = document.createElement('div');
inner.className = 'percent';
inner.id = 'innerdiv'; // set the CSS class
progress.appendChild(inner);
document.body.appendChild(progress); // put it into the DOM
//Start event listener to check if a file has been selected
run = document
.getElementById('files')
.addEventListener('change', handleFileSelect, false);
///Progress bar and other functions
function errorHandler(evt) {
switch (evt.target.error.code) {
case evt.target.error.NOT_FOUND_ERR:
alert('File Not Found!');
break;
case evt.target.error.NOT_READABLE_ERR:
alert('File is not readable');
break;
case evt.target.error.ABORT_ERR:
break;
default:
alert('An error occurred reading this file.');
}
}
function updateProgress(evt) {
// evt is an ProgressEvent. Updates progress bar
if (evt.lengthComputable) {
var percentLoaded = Math.round((evt.loaded / evt.total) * 100);
// Increase the progress bar length.
if (percentLoaded < 100) {
progress.style.width = percentLoaded + '%';
progress.textContent = percentLoaded + '%';
}
}
}
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