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Add initial GeoHash node

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Dave C-J
2014-12-10 09:30:20 +00:00
parent dbff1dc28c
commit 785f2dde16
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<!--
Copyright 2014 IBM Corp.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
-->
<script type="text/x-red" data-template-name="geohash">
<div class="form-row">
<label for="node-input-name"><i class="fa fa-tag"></i> Name</label>
<input type="text" id="node-input-name" placeholder="Name">
</div>
</script>
<script type="text/x-red" data-help-name="geohash">
<p>A function that encodes lat,lon to and from a geohash.</p>
<p>If the <b>msg.payload</b> is a string it tries to see if it's a geohash -
if so it tries to decode it and outputs a payload object containing
<ul><li>latitude<li>longitude<li>error.latitude<li>error.longitude</ul></p>
<p>If the <b>msg.payload</b> is an object with properties lat or latitude and lon or longitude
- it will add a <b>geohash</b> property to the payload.</p>
<p>The precision can be set by <b>msg.payload.precision</b> from 1 to 9.
<p><b>Note:</b> If the msg contains a .location property it will operate on that in preference to the .payload.</p>
</script>
<script type="text/javascript">
RED.nodes.registerType('geohash',{
category: 'function',
color:"#DEBD5C",
defaults: {
name: {value:""}
},
inputs:1,
outputs:1,
icon: "arrow-in.png",
label: function() {
return this.name||"geohash";
},
labelStyle: function() {
return this.name?"node_label_italic":"";
}
});
</script>

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/**
* Copyright 2014 IBM Corp.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
**/
module.exports = function(RED) {
"use strict";
var geohash = require('ngeohash');
function GeohashNode(n) {
RED.nodes.createNode(this,n);
var node = this;
var round = function(value, decimals) {
return Number(Math.round(value+'e'+decimals)+'e-'+decimals);
}
this.on("input", function(msg) {
if (msg.hasOwnProperty("location")) {
if (msg.location.hasOwnProperty("geohash")) {
var pos = geohash.decode(msg.location.geohash);
msg.location.lat = round(pos.latitude,5);
msg.location.lon = round(pos.longitude,5);
msg.location.error = { lat:round(pos.error.latitude,5), lon:round(pos.error.longitude,5) };
node.send(msg);
}
else {
var lat = msg.location.lat;
var lon = msg.location.lon;
var len = parseInt(msg.location.precision || msg.location.payload || 9);
if (len < 1) { len = 1; }
if (len > 9) { len = 9; }
if (lat && lon) {
msg.location.geohash = geohash.encode(lat, lon, len);
node.send(msg);
}
}
}
else if (typeof msg.payload === "string") {
// try to decode it...
var regexp = new RegExp('^[a-z0-9]{1,9}$'); // can only contain a-z or 0-9 and length 1-9
if (regexp.test(msg.payload)) {
var pos = geohash.decode(msg.payload);
msg.payload = { lat:round(pos.latitude,5), lon:round(pos.longitude,5) };
msg.payload.error = { lat:round(pos.error.latitude,5), lon:round(pos.error.longitude,5) };
node.send(msg);
}
else if (msg.payload.indexOf(",") !== -1) {
// has a comma so assume it's lat,lon(,precision)
var bits = msg.payload.split(",");
if (bits.length === 2) {
var la = Number(bits[0]);
if (la < -90) { la = -90; }
if (la > 90) { la = 90; }
var lo = Number(bits[1]);
if (lo < -180) { lo = -180; }
if (lo > 180) { la = 180; }
msg.payload = geohash.encode(la, lo);
node.send(msg);
}
else { node.warn("Unexpected string format - should be lat,lon"); }
}
else { node.warn("Unexpected string format - should either be lat,lon or geohash"); }
}
else if (typeof msg.payload === "object") {
var lat = msg.payload.lat || msg.payload.latitude;
var lon = msg.payload.lon || msg.payload.longitude;
var len = parseInt(msg.payload.precision || 9);
if (len < 1) { len = 1; }
if (len > 9) { len = 9; }
if (lat && lon) {
msg.payload.geohash = geohash.encode(lat, lon, len);
node.send(msg);
}
}
else {
node.warn("This node only expects strings or objects.");
}
});
}
RED.nodes.registerType("geohash",GeohashNode);
}

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node-red-node-geohash
=====================
A <a href="http://nodered.org" target="_new">Node-RED</a> node to encode and decode lat,lon pairs to a <h href="http://en.wikipedia.org/wiki/Geohash">geohash</a> string.
Install
-------
Run the following command in the root directory of your Node-RED install
npm install node-red-node-geohash
Usage
-----
This function encodes a lat,lon string to and from a geohash.
If the **msg.payload** is a string it tries to see if it's a geohash -
if so it tries to decode it and outputs a payload object containing
- latitude
- longitude
- errorlatitude
- error.longitude
If the **msg.payload** is an object with properties **lat** or **latitude** and **lon** or **longitude** - it will add a <b>geohash</b> property to the payload.
The precision can be set by **msg.payload.precision** from 1 to 9.
Example flow
------------
<pre><code>[{"id":"60ebfc45.9f1404","type":"function","name":"","func":"msg.payload = {lat:51,lon:-1,precision:5};\nreturn msg;","outputs":1,"x":281,"y":485,"z":"385bdf8b.c7a42","wires":[["6f1c5357.90e3ac"]]},{"id":"6f1c5357.90e3ac","type":"geohash","name":"","x":415.5,"y":420,"z":"385bdf8b.c7a42","wires":[["71a94378.8e56bc"]]},{"id":"52763c46.ad89c4","type":"inject","name":"","topic":"","payload":"51.05,-1.05","payloadType":"string","repeat":"","crontab":"","once":false,"x":165.5,"y":337,"z":"385bdf8b.c7a42","wires":[["7b08247.f84f7dc"]]},{"id":"7b08247.f84f7dc","type":"geohash","name":"","x":360.5,"y":337,"z":"385bdf8b.c7a42","wires":[["6f1c5357.90e3ac","893e37b7.76c1c8"]]},{"id":"6fec77c4.901388","type":"inject","name":"","topic":"","payload":"","payloadType":"date","repeat":"","crontab":"","once":false,"x":155,"y":397,"z":"385bdf8b.c7a42","wires":[["60ebfc45.9f1404"]]},{"id":"893e37b7.76c1c8","type":"debug","name":"","active":true,"console":"false","complete":"false","x":535,"y":337,"z":"385bdf8b.c7a42","wires":[]},{"id":"71a94378.8e56bc","type":"debug","name":"","active":true,"console":"false","complete":"false","x":590,"y":420,"z":"385bdf8b.c7a42","wires":[]}]</code></pre>

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{
"name" : "node-red-node-geohash",
"version" : "0.0.1",
"description" : "A Node-RED node to encode and decode lat,lon pairs to a geohash.",
"dependencies" : {
"ngeohash" : "0.6.0"
},
"repository" : {
"type":"git",
"url":"https://github.com/node-red/node-red-nodes/tree/master/parsers/geohash"
},
"license": "Apache-2.0",
"keywords": [ "node-red", "geohash" ],
"node-red" : {
"nodes" : {
"geohash": "70-geohash.js"
}
},
"author": {
"name": "Dave Conway-Jones",
"email": "ceejay@vnet.ibm.com",
"url": "http://nodered.org"
}
}