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

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4
votes
2answers
2k views

d3.geo.path() to draw a path from GIS coordinates

Trying to take GIS data of the zip codes of the Bronx and turn it into a map using d3.js. But I am having trouble rendering. Could you show me proper use of d3.geo.path() ? [ [ -73.84463693999993, ...
1
vote
0answers
48 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 ...
1
vote
1answer
44 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 ...
2
votes
1answer
63 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 ...
2
votes
1answer
52 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 ...
1
vote
1answer
35 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 ...
1
vote
1answer
100 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
votes
1answer
531 views

Displaying ArcGIS Server dates without javascript localized date offset?

Esri recommends that databases are in UTC time. And if I’ve got this right, unless you set a time zone in your layer, you are entering a date in a date field as UTC. Mostly this is fine.You understand ...
0
votes
0answers
21 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 ...
1
vote
1answer
747 views

How to create working Hyperlinks in OnDemandGrid Cells

I'm creating a simple ArcGIS application that shows a table of data from a feature layer, one of which is a URL string. I'd like to make that string be a clickable hyperlink. Is this possible and if ...
1
vote
0answers
47 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 ...
0
votes
1answer
56 views

Bounding the Google Maps Search area to my Fusion Layer area?

I have a searchable Google Fusion Layer of Glasgow Postcodes that highlights the searched areas on a map. The search works fine if I enter a full postcode (for e.g. G1 1BL) that matches the data in ...
0
votes
0answers
27 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: ...
0
votes
0answers
39 views

OpenLayers supported image formats

I need to display ImageLayer in OpenLayers. Which image formats are supported in OpenLayers?
2
votes
1answer
25 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 ...
1
vote
0answers
19 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
votes
1answer
29 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 ...
2
votes
0answers
27 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 ...
3
votes
8answers
11k views

How to create an interactive map with jQuery and HTML?

I want to develop a map in JQuery and HTML. It needs to show world country borders. It must be enabled mouse hover effect and also popup (when mouse over) in which I can add my own text. What JS ...
1
vote
0answers
32 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 ...
14
votes
6answers
6k views

Pure JavaScript Library for Geometry Operations

Does anyone know of a pure JavaScript library for doing geometry operations such as buffer, union, intersects, etc? I want to play with doing these operations in the browser. It looks like ...
13
votes
4answers
3k views

Which framework is best to implement an application robustly, using ArcGIS Server JS API?

Over on the Esri forum, user Matt Moyles suggested that the approach used in the Esri JS samples isn't suitable for robust development of a web mapping application using HTML, JavaScript and CSS: ...
13
votes
6answers
3k views

Visualizing large datasets with Leaflet

When using Leaflet to visualize a large dataset (GeoJSON with 10,000 point features), not surprisingly the browser crashes or hangs. A sub-sample of 1000 features from the same dataset works ...
1
vote
1answer
51 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 ...
0
votes
0answers
71 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 ...
2
votes
1answer
27 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?
1
vote
1answer
52 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 ...
1
vote
0answers
40 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) { ...
3
votes
2answers
93 views

How to display information in a div outside the map?

I tried a bit around and created a simple map with two polygons(most of the code I got from the Interactive Choropleth Map Tutorial). I added a "L.control()" to show information about the polygons in ...
1
vote
1answer
74 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 ...
0
votes
3answers
61 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 ...
0
votes
0answers
49 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 ...
0
votes
1answer
227 views

Browse (add/remove) ArcGIS Server Services (Layers) from the ESRI Javascript API viewer

I am quite new to the Javascript API. I am not if there is a widget that does what I would like but I am trying to create a web map that allows the users to choose/add/remove layers located on our GIS ...
0
votes
0answers
67 views

Geocortex Viewer: Running a Workflow with Arguments

I have a webpage with the Silverlight Geocortex Viewer embedded in it. Through the browser's developer console, I can run commands through it such as ...
0
votes
0answers
92 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
votes
1answer
42 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
votes
0answers
95 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 ...
2
votes
1answer
123 views

Check if line crosses a polygon

What I'm trying to do is with JSTS to check with lineGeom.crosses(polygonGeom) function if a line is crossing completely a polygon. The problem is that both cases from the picture returns true. I ...
0
votes
0answers
25 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
vote
0answers
27 views

Calculate distance in point collection algorithm

I've got collection of points which are sorted by x,y and distance between n and n+1 (array of objects [{x:0,y:0},{x:1,y:1}....] I would like to calculate distance between all points (point 1 distance ...
1
vote
0answers
39 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
votes
0answers
43 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 ...
0
votes
0answers
50 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
vote
0answers
68 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 ...
2
votes
2answers
209 views

How can I convert esriMeters to Lat/Lng?

I am pulling a JSON list of features into a web page. The points come as esriMeters and the rest of my app uses Lat/Lng. How can I do this conversion in the browser (javascript)?
2
votes
1answer
73 views

Openlayer3 basemap appears white block in Chrome

i faced interesting an issue on Chrome. im using google's 4 number base layer (street, hybrit, etc.) When my tiles are loading over baselayer, baseLayer becomes white block. Why? No any issues on ...
0
votes
1answer
108 views

OpenLayers - Resize a point on zoom out?

I need to resize a point on zoom. When you deep zoom the point get larger and on zoom out the point is smaller. In fact, the post here - How to resize a point on zoom out? seems to have exactly ...
2
votes
1answer
468 views

Search Functionality using Cartodb API

I posted a similar question about this a month or so ago and I was still in early stages of researching the problem thus not to many results came from it .After some time and effort I have come close ...
0
votes
0answers
30 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, ...
1
vote
1answer
2k views

Add label/text to esri.symbol.PictureMarkerSymbol

How can I add label or text on the ESRI's PictureMarkerSymbol (Javascript API)? I could use any other marker as well that support labels. Thanks!!