JavaScript is a prototype-based, object-oriented scripting language that is dynamic, weakly typed and has first-class functions.

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12 views

Time Slider in CartoDB

I once again have a question regarding this map project I'm working on. I'm trying to add a time slider to my CartoDB map, and the slider appears, but instead of displaying the correct dates and the ...
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1answer
24 views

Determine size of screen/map to limit number of markers displayed

I am writing a JQuery Openlayers javascript web application that connects to a API, which exposes a million geo located points plus metrics and information about the points. One metric is a points ...
1
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1answer
18 views

Why doesn't a CartoDB layer (using cartodb.js) on top of Google Map in Firefox on Ubuntu work?

I'm creating a layer using CartoDB.js and putting it on a Google Map base layer. This works on every other browser and platform I have access to (IE, Chrome, Firefox on OS X), but does not work on ...
2
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1answer
34 views

Adding multiple WMS layers in OpenLayers

I have an array of layers that I am passing to map.addLayers(). When I pass the array to the function in $(document).ready(function (){}), it doesn't add them to the map (i.e. map.layers does not have ...
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1answer
53 views

Changing map projection and adding graphic features in projected coordinate system using ArcGIS API for JavaScript?

I'm having some problems with the ArcGIS API for JavaScript. I have a web service that traces an electric network and sends back JSON with point and polyline (path) geometry. I've created a function ...
2
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1answer
55 views

Problem measuring area with gps coordinates

I am trying to measure area from gps coordinates but fail to get the correct result (7200 square meters). I used the formula from this post but I get way too high number as result (should be in square ...
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0answers
11 views

How to add custom events to OpenLayers-based API?

I am woking on a GIS API built on top of OpenLayers. I have a class called xgis.group, which represent a group of layers. I want to add an event that can be triggered when a group is added. For ...
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1answer
19 views

How to style geojson polygon using L.mapbox.featureLayer()

I have this code: var SupIncend = L.mapbox.featureLayer().addTo(map); var ArbolesAntes = L.mapbox.featureLayer().addTo(map); var ArbolesX = L.mapbox.featureLayer().addTo(map); var ...
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0answers
9 views

Prevent framedCloud cut off in OpenLayers by adjusting relativePosition [closed]

I've been assigned a project and I just simply do not have enough knowledge of OpenLayers to figure this problem out. I've got this map with EPSG:900913 projection. We've calculated the ideal ...
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0answers
28 views

Multiple Leaflet maps on website in different divs

I'm pretty new to leaflet.js and I'm trying to figure out how to assign the same map with the same set of options and layers to a different HTML container instead of having to remove and add a new one ...
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0answers
19 views

ogr / osr for node.js / javascript

I use a python module I created that does tests for point in polygon. It uses the python osgei/ogr and osr modules. Specifically, I use the following elements of these modules: ...
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0answers
32 views

OpenLayers supported image formats

I need to display ImageLayer in OpenLayers. Which image formats are supported in OpenLayers?
2
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1answer
20 views

How to detect other objects are on which side of an object based on lat long

I am working on a system that detects the lat/long of vehicles. I want to track other vehicle's position: left, top-left, right, top-right, bottom-right, bottom-left etc based on lat/long. I have ...
2
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1answer
25 views

OpenLayers - cannot set layer opacity

I have the following problem: by default, you can simply change the opacity of layer by writing for example: layer.setOpacity(0.3); But when I add it to my map SelectFeature controls, my layer is ...
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0answers
16 views

Leaflet: Is there a way to use click event just like mouseout?

I made a map with leaflet by following the official Leaflet tutorial on interactive choropleth maps. I would like to make the map compatible with smartphones, so I added a click event, which acts ...
2
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0answers
20 views

OpenLayers: Switch layer off when switching another layer on

As the title says, I want to turn layers off when turning another layer on. I wrote a function that works. However, I have to click the layer twice in the LayerSwitcher to turn the layer on that I ...
1
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0answers
17 views

How to change dialog box with jQuery Mobile on OpenLayers

I have a problem with dialog box made with jQuery Mobile on OpenLayers. I want to make a popup box instead of a dialog box, but when i click the point the info for the point appears at different ...
1
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1answer
39 views

How can I measure area in square kilometres from lat / lon gps coordinates?

I have code from openlayers that I cannot quite handle because I am so new for these kind of codes. My main goal is to measure area from n amount of lat/lon gps coordinates and convert the result into ...
2
votes
1answer
23 views

How to display MousePosition outside map container? [closed]

I am a new to OpenLayers. By Default the MousePosition displays the coordinates within the map. I need to display the coordinates outside the map is a specific place. How do I do this?
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0answers
22 views

Callback method geocode items nominatim not work

function addr_search() { var inp = document.getElementById("addr"); $.getJSON('http://nominatim.openstreetmap.org/search?format=json&limit=5&q=' + inp.value, function(data) { ...
0
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0answers
28 views

javascript/jQuery getJSON very slow with a inner loop

asked here too http://stackoverflow.com/q/25024466/528884 I'm using OpenLayers to render DOM for layerswitcher, with about 1200 divs. The problem can be simplified as follows. This is very fast (3 ...
1
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1answer
41 views

Changing list-item css class using ng-class when mousing over Leaflet Map Markers

I've got a doozy of an ng-class problem. So I have an app with a map/markers on the right and a list-item menu on the left with info about the markers (like Yelp or Foursquare). With some of my ...
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3answers
51 views

How to draw polygons from watershed boundary dataset?

I'm working on a web map using esri arcgis javascript api. I'd like to use the NHD Watershed Boundary Data to draw polygons based on the boundaries of the watersheds. Does anyone have any ideas of how ...
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0answers
50 views

How to create dynamic legend for multiply layers with leaflet.js?

I want to create multiple choropleth maps which displays different statistical data with leaflet.js. So it would be nice to show different legends for each map. I create such legends for two layers ...
0
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1answer
26 views

Date field formatting as number in ESRI popup window

We are using the Park and Recreation Locator from ArcGIS for State Government and trying to put a date field into the popup info window. The field is pulling the correct data, but it's formatting it ...
0
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0answers
35 views

How can I get responsive pinch-zoom when using OpenLayers 3 and Google Maps

Following the OpenLayers 3 Google Maps integration example, I'm able to put my own custom tile layer over google maps imagery. However, on mobile devices and tablets, pinching-to-zoom only resizes ...
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0answers
11 views

Find a polygon by attribute Google map engine

I created a map via Google map Engine, (not the lite/pro). And then added an uploaded shapefile given to me as a data source. I've successfully published the map and access links are now available, ...
1
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1answer
47 views

image rectification with Mercator projection

I have written an image rectification function which allows a user to select 2 points on an image and 2 points on a map. The function will then rectify the image so it is translated, scaled and ...
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0answers
24 views

Placing Pins and following transformation on zoom map d3

So I am using this http:// bl.ocks. org/mbostock/4699541 framework on D3.js and I just figured out how to append circles to the map. However when you click on a state the circle moves out of place ...
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0answers
36 views

How to go about creating a custom tool/adding special functionality for a web app

In my soon to be developed web app, I will have an image service and also a feature service that is essentially an index to the image service, with all kinds of attributes. I would like for the user ...
0
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0answers
31 views

How to use different popup styles in the same leaflet web map for different dynamic map layers

I am very new to javascript, CSS and HTML. I have been playing around with leaflet and have been trying to figure out a way to customize popups for different features in my map. Is there a way to do ...
1
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0answers
50 views

How do I use Proj4Leaflet projections correctly?

I'm loading data layers from a WMS server into a Leaflet map, and I need to give the user a choice of projections. For the WMS server requests, I just need to change the CRS parameter to a different ...
0
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0answers
24 views

Add text to PictureMarkerSymbol in arcgis using javascript

I am new to ArcGis, i need complete code of how to add dynamic text on the marker symbol. I have Location Data in Json format: {locations: [{latitude: 52.1, longitude: 4.1, ...
0
votes
1answer
43 views

How to reduce the opacity of a Google Maps layer in CartoDB.js

I have a CartoDB.js-App where I load my vis using cartodb.createVis (I do not manually define Leaflet layers). How can I reduce the opacity of the Google Maps base layer? I tried the following, as ...
0
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0answers
22 views

FindTask doesn't work with rest of JavaScript code

I need to add a FindTask to the following code that returns the attributes of the searched in a data grid and selects the data on the map. By modifying the "show find task results in a datagrid" ...
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0answers
25 views

JavaScript: FindTask works but no data appears on map

I need to add a FindTask to the following code that returns the attributes of the searched in a data grid and selects the data on the map. By modifying the "show find task results in a datagrid" ...
2
votes
1answer
28 views

Make Leaflet Map Background Transparent

How can i make the background of the leaflet map transparent. I see opacity controls from the layers, but not the map background. Should the be changed just with plain CSS? Thanks
0
votes
1answer
43 views

Draw arc in Geo map WGS84 coordinate system

im trying to draw an arc in OpenLayers, in non Geo map it works well and here is my code: function calculateArcPointsNonGeo(center, radius,startAngle,endAngle,segments) { var pointList = ...
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0answers
41 views

Showing only some points in Feature Layer on ArcGIS.Com WebMap Javascript API

I am looking at creating a webmap which will allow users to place a point either by clicking on a map or selecting a point from a drop down which will then buffer the point. I've done something ...
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0answers
57 views

ArcGIS Circle Buffer

I am stuck, trying to draw a simple circle buffer using ArcGIS. Here is how I set up my base map: dojo.require("esri.map"); dojo.require("esri.tasks.servicearea"); dojo.require("dijit.dijit"); ...
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0answers
39 views

Point Cluster Layer not defined

I am trying to do a point cluster layer based on the JSON objects I obtained from database. Here is my JavaScript to plot a point cluster layer: function addClusters() { $.ajax({ url: ...
2
votes
1answer
73 views

How to apply weight to Google heatmap?

I am trying to plot a Google heatmap based on the JSON objects returned. Here is my JavaScript: function getHeatMap() { heatLayer = new HeatmapLayer({ config: { "useLocalMaximum": true, ...
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votes
0answers
13 views

How can i find shortest point on edge of a polygon from a point to that polygon (not it's distance ) [duplicate]

Point(x,y) may be inside or outside of the polygon ,shortest distance between polygon ABCDE and point(x,y) is marked as red line ,the intersecting point is Point(m,n) .I need the value of m and n I ...
4
votes
3answers
312 views

How can I find closest point on a polygon from a point

I have a point that may be inside or outside of a polygon, I need to find the nearest point on the polygon boundary from the point. Point(x,y) may be inside or outside of the polygon, shortest ...
1
vote
1answer
112 views

Using Google Map Spatial Reference to plot HeatMap?

Basically I am trying to plot a Google heatmap based on the JSON objects returned. Here is my JavaScript: function getHeatMap() { var gradient = [ 'rgba(185, 185, 203, 0)', ...
2
votes
0answers
49 views

How to simulate events from Openlayers 2?

I am working on a GIS API that uses OpenLayers. I am testing it using QUnit. The problem is I need to simulate clicks and trigger some events to be able to test the whole code. For example, I have a ...
0
votes
0answers
60 views

Radius based search with Leaflet maps

Using leaflet I have created a simple map, played around with markers (adding/removing) and have added some GeoJSON data polygons etc. I now need help with implementing a radius search. For example I ...
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0answers
37 views

Creating a layer switch Google Maps Api v3

I have generated a basic webpage with Visual Studio 2012 that displays a Google Map. My goal is to add multiple KML layers from my Server onto the Google Map, BUT, i want to be able to have a sort of ...
5
votes
3answers
172 views

Guidance when to style your features in Tilemill vs. Leaflet?

I've found this generally to be dependent on each project's goals (or what the client wants), but when you have the options, what any rules of thumb or guidelines do use you in a project to determine ...
0
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0answers
37 views

Dojo Stacked Columns Chart for JavaScript ArcGIS Web Map Pop

Anyone know how to use the the StackedColumns chart in dojo for ArcGIS JavaScript API? I need to add one to my popup window. I can only find the documentation below: ...