i try to get area from polygon using this code:
//leaflet.js attach
<script src="https://unpkg.com/leaflet#1.7.1/dist/leaflet.js"
integrity="sha512-XQoYMqMTK8LvdxXYG3nZ448hOEQiglfqkJs1NOQV44cWnUrBc8PkAOcXy20w0vlaXaVUearIOBhiXZ5V3ynxwA=="
crossorigin=""></script>
........
........
and after some code:
var area = L.GeometryUtil.geodesicArea(polygon .getLatLngs());
But , i can't find geodesicArea function in( error:"L.GeometryUtil.geodesicArea is not a function") . What i need to attach to get geodesicArea function?
Related
Trying to retrieve part of a district, however for some reason cannot see the whole area, even if zoom level is at 0, where (supposedly) we should see the whole world.
I am using L.CRS.Simple because this uses the EPSG:3763 and cannot see that one on the CRS list. I am retrieving the data in JSON cause when tying with geoJSON, was not able to transform the 3D coordinates data into 2D planes ones.
const queryRegionText = "where=OBJECTID > 0"
const geoJsonURL2 = "https://sig.cm-figfoz.pt/arcgis/rest/services/Internet/MunisigWeb_DadosContexto/MapServer/2/query?f=json&returnGeometry=true&geometryType=esriGeometryPolyline&spatialRel=esriSpatialRelIntersects&outFields=*&outSR=3763&" + queryRegionText
var map = L.map('mapid', {
crs: L.CRS.Simple
}).setView([-58216.458338, 42768.347232], 0);
L.control.scale({ metric: true }).addTo(map);
fetch(geoJsonURL2).then(function (response) {
response.json().then(function (data) {
data.features.forEach(element => {
if (element.geometry.rings) {
element.geometry.rings.forEach(point => {
L.polyline(point, { color: 'red' }).addTo(map);
})
}
});
});
});
var popup = L.popup();
function onMapClick(e) {
popup
.setLatLng(e.latlng)
.setContent("You clicked the map at " + e.latlng.toString())
.openOn(map);
}
map.on('click', onMapClick);
<html>
<head>
<title>Leaflet - testing</title>
<meta charset="utf-8" />
<link rel="stylesheet" href="https://unpkg.com/leaflet#1.7.1/dist/leaflet.css" />
<script src="https://unpkg.com/leaflet#1.7.1/dist/leaflet.js"></script>
</head>
<body>
<div id="mapid" style="width: 600px; height: 400px;"></div>
</body>
</html>
TL;DR: When creating the map, set the minimum zoom below zero. This should work:
var map = L.map('mapid', {
crs: L.CRS.Simple, minZoom: -6
}).setView([-57728, 55296], -6);
Explanation
Normally, Leaflet translates from a latitude/longitude coordinate system to screen pixels using an assumption that the world is 256 pixels high at Zoom level 0. At each higher Zoom Level, the number of pixels doubles (explained nicely in the Zoom levels tutorial). With this assumption, the options for the map default to {minZoom: 0, maxZoom: Infinity} (as you are not adding any Layer that sets these values to anything different).
When you use L.CRS.Simple, at Zoom level 0 it maps 1 coordinate unit to 1 screen pixel. Your data looks like it is about 18000 coordinate units tall, so it doesn't fit in your 400 pixel high map. To make it fit, we need each screen pixel to map to about 45 coordinate units. 2^5 is 32, and 2^6 is 64, so we need to zoom out between 5 and 6 times. Luckily, Leaflet accepts negative Zoom Levels, so setting zoom to -6 does the trick. But to make it work properly, you need to set {minZoom: -6}, so the map doesn't get stuck at zoom level 0. There's a good worked example in the Non-geographical Maps tutorial.
Using L.CRS.Simple should work for you, so long as the approximation holds that each latitude unit is the same length as each longitude unit (a square world). Since this isn't generally true in the real world, using the Simple projection will cause some distortion. If the distortion is significant for the features you are interested in, then you will need to look up how to use EPSG:3763 properly, using L.CRS and Proj4Leaflet, as suggested by #IvanSanchez.
So, after some reading on the proj4leaflet, come up with this code. Thanks in advance for the comments and the reply above.
const queryRegionText = "where=OBJECTID > 0"
const geoJsonURL2 = "https://sig.cm-figfoz.pt/arcgis/rest/services/Internet/MunisigWeb_DadosContexto/MapServer/2/query?f=geojson&returnGeometry=true&geometryType=esriGeometryPolyline&spatialRel=esriSpatialRelIntersects&outFields=*&outSR=3763&" + queryRegionText
const map = L.map('map', {
center: [40.14791, -8.87009],
zoom: 13
});
proj4.defs("EPSG:3763", "+proj=tmerc +lat_0=39.66825833333333 +lon_0=-8.133108333333334 +k=1 +x_0=0 +y_0=0 +ellps=GRS80 +units=m +no_defs");
fetch(geoJsonURL2).then(function (response) {
response.json().then(function (data) {
L.Proj.geoJson(data).addTo(map);
});
});
var popup = L.popup();
function onMapClick(e) {
popup
.setLatLng(e.latlng)
.setContent("You clicked the map at " + e.latlng.toString())
.openOn(map);
}
map.on('click', onMapClick);
<head>
<link rel="stylesheet" href="https://unpkg.com/leaflet#1.7.1/dist/leaflet.css" />
<link rel="stylesheet" href="main.css">
<script src="https://cdnjs.cloudflare.com/ajax/libs/leaflet/1.7.1/leaflet.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/proj4js/2.7.4/proj4.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/proj4leaflet/1.0.2/proj4leaflet.js"></script>
</head>
<body class="">
<div id="map" style="width: 600px; height: 400px;"></div>
</div>
<script src="main.js"></script>
</body>
I have the following data in a Google Spreadsheet:
ColumnA ColumnB
Departament Quantity
01/01/2016 23
02/01/2016 43
04/01/2016 5
06/01/2016 65
10/01/2016 12
11/01/2016 32
13/01/2016 22
15/02/2016 2
And want to draw a linechart using HTML Templates: This is my code so far now
<!DOCTYPE html>
<html>
<head>
<script src="https://www.google.com/jsapi"></script>
</head>
<body>
<div id="main"></div>
<script>
google.load('visualization', '1', {packages: ['corechart', 'bar']});
google.setOnLoadCallback(getSpreadsheetData);
function getSpreadsheetData() {
google.script.run.withSuccessHandler(drawChart).getSpreadsheetData();
}
function drawChart(rows) {
var options = {'title':'Example','width':400,'height':300};
var data = google.visualization.arrayToDataTable(rows, false);
var chart = newgoogle.visualization.LineChart(document.getElementById("main"));
chart.draw(data, options)
}
</script>
</body>
</html>
My script to read the sheet:
function getSpreadsheetData() {
var ssID = "12GvIStMKqmRFNBM-C67NCDeb89-c55K7KQtcuEYmJWQ",
sheet = SpreadsheetApp.openById(ssID).getSheets()[0],
data = sheet.getDataRange().getValues();
return data;
}
However i cant draw the plot, this issue dissapear when i change the data to a numeric (i.e. 42370), but thats not what i want!
Question is: what do i have to add in order to change to the right format in x axis?
You can use the hAxis.format configuration option
var options = {'title':'Example','width':400,'height':300,//-->'format':'MM/dd/yyyy'};
The valid format options can be found here...
And if you need to load with a specific locale, see this...
Using the tutorial from google on using a spreadsheet as data for a chart I have created the following.
Tutorial
<head>
<script type="text/javascript" src="https://www.gstatic.com/charts/loader.js"></script>
<script type="text/javascript">
google.charts.load('current', {packages: ['corechart']});
google.charts.setOnLoadCallback(drawChart);
function drawSheetName() {
var query = new google.visualization.Query('https://docs.google.com/spreadsheets/d/15l3ZK45hv2ByOfkUiAKoKp-Z9a1u1-Q_rsLS7SqC51E/editgid=0&headers=1');
query.send(handleQueryResponse);
}
function handleQueryResponse(response) {
if (response.isError()) {
alert('Error in query: ' + response.getMessage() + ' ' + response.getDetailedMessage());
return;
}
var data = response.getDataTable();
var chart = new google.visualization.ColumnChart(document.getElementById('chart_div'));
chart.draw(data, { height: 400 });
}
}}
</script>
</head>
<body>
<!-- Identify where the chart should be drawn. -->
<div id="chart_div"/>
</body>
However no chart resolves, I have made the link public.
If I share the link it is https://docs.google.com/spreadsheets/d/15l3ZK45hv2ByOfkUiAKoKp-Z9a1u1-Q_rsLS7SqC51E/edit?usp=sharing
Following the docs and not sure where my error is.
This SO answer more about drive-sdk creates the key from a script from a new file, I don't really understand it and nuclear how you can obtain the correct URL for existing spreadsheets.
Would be great if there could be a consolidated answer obtaining correct sheets URL's.
Is this what you are trying to achieve?
If yes, you can check how it works here.
EDIT
Since I notice in the comments you want to query the spreadsheet and not use the entire spreadsheet, this is the logic to query with.
First, these are the basic components of the url to query:
var BASE_URL = "https://docs.google.com/a/google.com/spreadsheets/d/";
var SS_KEY = "stringSS_Key";
var BASE_QUERY = "/gviz/tq?tq=";
var partialUrl = BASE_URL + SS_KEY + BASE_QUERY;
Notice the BASE_QUERY variable
The first bit of the url is in the partialUrl variable.
Then, you need to use the Query Language that google provides. An example would be:
var queryToRun = 'select dept, sum(salary) group by dept';
You then need to call encodeURIComponent() on it, and add it to the partial URL. The final URL then becomes
var finalUrl = partialUrl + encodeURIComponent(queryToRun);
Only then you can run the google.visualiation.query as I suspect you intend.
var query = new google.visualization.Query(finalUrl);
I've loaded the MapQuest JavaScript api module and am able to bring in the basic sample map at http://developer.mapquest.com/web/documentation/sdk/javascript/v7.0/basic-map but when I try to add map controls using their next example I get the JavaScript error:
map.addControl is not a function
I tried window.map.addControl but that generates the same error.
Does anyone know what might be wrong?
Thanks
You need to add the map control code within your MQA.EventUtil.observe
right after your call to window.map = new MQA.TileMap(options);
Code:
<html>
<head>
<script src="http://www.mapquestapi.com/sdk/js/v7.0.s/mqa.toolkit.js?key=Kmjtd%7Cluua2qu7n9%2C7a%3Do5-lzbgq"></script>
<script type="text/javascript">
MQA.EventUtil.observe(window, 'load', function() {
/*Create an object for options*/
var options={
elt:document.getElementById('map'), /*ID of element on the page where you want the map added*/
zoom:10, /*initial zoom level of map*/
latLng:{lat:39.743943, lng:-105.020089}, /*center of map in latitude/longitude*/
mtype:'map' /*map type (map)*/
};
/*Construct an instance of MQA.TileMap with the options object*/
window.map = new MQA.TileMap(options);
MQA.withModule('largezoom','traffictoggle','viewoptions','mousewheel', function() {
map.addControl(
new MQA.LargeZoom(),
new MQA.MapCornerPlacement(MQA.MapCorner.TOP_LEFT, new MQA.Size(5,5))
);
map.addControl(new MQA.TrafficToggle());
map.addControl(new MQA.ViewOptions());
map.enableMouseWheelZoom();
});
});
</script>
</head>
<body>
<div id='map' style='width:750px; height:280px;'></div>
</body>
</html>
try like this map.current.addControl
Make sure you add the module for the control before adding the control to the map.
I am trying to add min and max limits to a Google chart, which I generate using a Perl script from CSV data - by using the interval role for these 2 values.
Unfortunately the I-lines are not displayed at my line chart, even though I've set the min and max limits to the -100 and 100 for the sake of testing.
Only the main data is being displayed:
Can anybody please spot the error, what is wrong with my very simple test case?
Please just save the code below as an HTML-file and open in a browser:
<!DOCTYPE HTML>
<html>
<head>
<script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script>
<script type="text/javascript" src="https://www.google.com/jsapi?autoload={'modules':[{'name':'visualization','version':'1','packages':['corechart']}]}"></script>
<script type="text/javascript">
var data = {"L_B8_ACLR_50_0_QPSK_1_H":{"rows":[
{"c":[{"v":"UTRA_1_DOWN"},{"v":-100},{"v":100},{"v":"-42.46912"}]},
{"c":[{"v":"E-UTRA_1_DOWN"},{"v":-100},{"v":100},{"v":"-39.9545"}]},
{"c":[{"v":"E-UTRA_1_UP"},{"v":-100},{"v":100},{"v":"-48.68408"}]},
{"c":[{"v":"UTRA_1_UP"},{"v":-100},{"v":100},{"v":"-49.45148"}]},
{"c":[{"v":"UTRA_2_UP"},{"v":-100},{"v":100},{"v":"-58.96674"}]}],
"cols":[
{"p":{"role":"domain"},"label":"MEASUREMENT","type":"string"},
{"p":{"role":"interval"},"label":"LSL","type":"number"},
{"p":{"role":"interval"},"label":"USL","type":"number"},
{"p":{"role":"data"},"label":"1142926087","type":"number"}]}};
function drawCharts() {
for (var csv in data) {
var x = new google.visualization.DataTable(data[csv]);
var options = {
title: csv,
width: 800,
height: 600
};
var chart = new google.visualization.LineChart(document.getElementById(csv));
chart.draw(x, options);
}
}
$(function() {
google.setOnLoadCallback(drawCharts);
});
</script>
</head>
<body>
<div id="L_B8_ACLR_50_0_QPSK_1_H"></div>
</body>
</html>
(I don't want to use methods like addColumn or addRows. Instead I prepare my data as data structure in my Perl script and then JSON-encode and pass it to DataTable ctr).
You must specify the interval-role column after the data-column. As written in the API :
"All columns except domain columns apply to the nearest left neighbor to which it can be applied"
So if you change the order (and here with some smaller intervals)
var data = {"L_B8_ACLR_50_0_QPSK_1_H":{"rows":[
{"c":[{"v":"UTRA_1_DOWN"},{"v":"-42.46912"},{"v":-50},{"v":-45}]},
{"c":[{"v":"E-UTRA_1_DOWN"},{"v":"-39.9545"},{"v":-50},{"v":-45}]},
{"c":[{"v":"E-UTRA_1_UP"},{"v":"-48.68408"},{"v":-50},{"v":-45}]},
{"c":[{"v":"UTRA_1_UP"},{"v":"-49.45148"},{"v":-50},{"v":-45}]},
{"c":[{"v":"UTRA_2_UP"},{"v":"-58.96674"},{"v":-50},{"v":-45}]}],
"cols":[
{"p":{"role":"domain"},"label":"MEASUREMENT","type":"string"},
{"p":{"role":"data"},"label":"1142926087","type":"number"},
{"p":{"role":"interval"},"label":"LSL","type":"number"},
{"p":{"role":"interval"},"label":"USL","type":"number"}
]}};
..You end up with :