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

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3
votes
1answer
132 views

Limits to torque and cartodb

Bit of a theoretical one this, but I was wondering if anyone had tried to use CartoDB and Torque with any big(ish) data. What I am talking about is having the location of 75,000 people at 1 minute ...
1
vote
2answers
60 views

accesing openlayers.map in index.html

I am developing an app using OpenTripPlanner. It creates an OpenLayer map in map.js. I want to access this map in index.html so I can set it's center. Kindly help me out.
1
vote
0answers
562 views

How should I make use of railway routes from Google Maps API?

I have a specific requirement wherein I have to display or highlight only railway stations in the map rather than the whole map. How can this be achieved? This is the code I tried: <html> ...
0
votes
0answers
39 views

Display Google Maps Polygon Edge Distances in Meters?

How can I achieve this using the Google Maps API? The meters on each side.
1
vote
2answers
477 views

Display photo in GeoExt popup

I have point feature with name PointPhoto. This feature have attribute: id area PhotoPath Now I am using GeoExt popup to display this attributes, but I cant find a way to display image from ...
2
votes
1answer
69 views

Make InfoTemplate moveable but still highlight attributes

I’m using the esri/InfoTemplate in the Javascript API to identify features. However, it gets anchored to the mouse click and cannot be moved around. Based on this answer I used dojo/dnd/Moveable to ...
2
votes
1answer
1k views

Help with getting the coordinates of a point updated using ESRI JS API Editor

I've been working with ESRI's javascript API for about a week and finding that somethings click while other things are still a mystery to me. I've already created a simple web map that loads an ...
2
votes
0answers
36 views

split polyline at specific distance

I am working on a project that uses sql server for geometry datatype and arcgis server and asp.net website and entity framework for data access and arcgis javascript api for map viewer. I want to ...
0
votes
1answer
105 views

Mouse click event used gis application with much data

I will create an application that using my water pipes, electric cables, gas pipes service in a city. All of streets and roads including water pipes. My service is publishing pipes. My service like ...
1
vote
0answers
31 views

Retrieve the attributes from a feature with IdentifyTask/IdentifyRequest (Javascript API)

So I'm building a GIS web application. I am able to get the result from IdentifyTask with the "oncomplete" function, the problem I am running into is how I can get the information back out of the ...
0
votes
0answers
99 views

Layer Definition Query - Subqueries

Background: I want to track the movement of icebergs in ArcGIS. In my FileGeodatabase I have a single Iceberg layer. What I have thought of is to create an ID field for each object; each ArcGIS ...
1
vote
0answers
47 views

Increase maximum zoom level for a WebTiledLayer in ArcGIS

I am using the WebTiledLayer from the Javascript ArcGIS API to render a custom WMTS source. The WMTS I am using has zoom levels going from 18 to 21, however I cannot zoom in further than what appears ...
0
votes
1answer
66 views

OpenLayers Drag&Drop a pin to select position?

Is there an OpenLayers example that allows the user to set a position with drag&drop. I would like to have a pin and set the position after the user drags & drops the pin to a new position.
0
votes
0answers
35 views

Node.js transformation from NAD83 to WGS84

I've used the excellent npm shapefile library to import Canadian electoral districts into MongoDB. Here's a sample file: http://ftp2.cits.rncan.gc.ca/pub/geott/electoral/2011/fed308.2011.zip Is ...
0
votes
0answers
25 views

Openlayers map changelayer event firing twice for params

I have registered changelayer event of my map. var registerEvents = function () { map.events.register("changelayer", null, onMapLayerChanged, true); }; var onMapLayerChanged = ...
0
votes
0answers
25 views

Openlayers complex markers

I have an example that displays an image as well as a string for each marker. My designers want the string to be displayed on top of the image and I don't know how long the string can be. Also I need ...
0
votes
0answers
32 views

imposm2 to imposm3

I am using imposm2 to import osm data to postgresql database but recently moved to imposm3 which is still in development phase I want to know is there an easy way to convert imposm2 mapping file ...
0
votes
0answers
90 views

OpenLayers 3 and Interactions - Select and Draw

I'm trying to make small app with OpenLayers3. I want to use two interactions - select and draw. Unfortunately when selet adding it's style to draw and remove other (selected earlier) features from ...
1
vote
1answer
2k views

OpenLayers and GeoJSON - problem projecting EPSG:4326

I'm trying to project some GeoJSON data but it ends up at 0,0. I've looked at other posts and tried those solutions to no avail. Can anyone help? Here is the code: <html> <head> ...
9
votes
1answer
196 views

Mercator bias plot in Leaflet

I was inspired by this wikipedia image from the mercator projections page to hack around with leaflet. The idea was to interactively have your cursor move a continent and that it would be corrected ...
1
vote
0answers
72 views

Create a Leaflet custom checkbox control

I want to create a custom checkbox control which will simply set a flag in jquery/javascript: if checked the flag = 'clustered' or if unchecked flag = 'unclustered'. So far I have a control on the ...
2
votes
1answer
110 views

How to use right-click to finish drawing a Polygon in OpenLayers?

I'm using OpenLayers 2.13 and the DrawFeature control. By Default, the Polygon is completed, when you double click. Some of our clients are requesting that we allow the mouse right-click, to finish ...
1
vote
3answers
2k views

Label in the middle of linestring in OpenLayers

Is there anyone can put label in the middle of the linestring dynamically? I've used labelAlign option. I've changed this value from bc, cc, cm, etc. But it doesn't work at all. There's also option ...
1
vote
1answer
172 views

How can I extract variable information from an OpenLayers 3 object?

I have tried to make a simple map with OL 3's Geolocation module. I succeeded with a resource wasting method. There must be a simpler way to extract variable information from an OpenLayers 3 object. ...
1
vote
0answers
27 views

How to pre-populate JavaScript forms in ArcGIS Web Application?

I have an ArcGIS web application and would like to pre-populate order numbers. Say if order 1 has been entered for a point on a map, when the next point is added, order 2 would populate ...
8
votes
6answers
14k views

OpenLayers - redrawing map after container resize

In my web application, I want to enable users to set the size of the map container. Everything worked fine when the container was expanded slightly (apparently this is because the tiles that were ...
4
votes
2answers
65 views

tabbed popup window for Arcgis Javascript

Anyone know examples of a tabbed popup window for Arcgis for javascript, NOT an infowindow? If you could point me in the the right direction it would help.
3
votes
2answers
79 views

Which one of these azimuth values is the right one? And why?

First of all, let's make clear that I want the Azimuth on the surface of the Earth, i.e. the angle between two locations, for example New York and Moscow. I am testing some azimuth calculations with ...
0
votes
1answer
89 views

How to calculate the Azimuth between two points in PostGIS?

I have a GIS API based on OpenLayers. I have been trying to implement Azimuth calculation in JavaScript and I needed some way to calculate the Azimuth in order to perform tests. I started using ...
6
votes
1answer
761 views

ArcGIS JS API Relationship Queries

Has anyone ever put the results of a RelationshipQuery() into a map.infoWindow that's been replaced with a dijit.popup? Here's the workflow: User clicks a point, and all identify results are put ...
4
votes
1answer
236 views

How to generate xml for use with geoxml3

I have a kml and shp I would like to convert to an xml to use with geoxml3. How would I go about doing such a thing? The xml I generate should look something like this: <?xml version="1.0" ...
0
votes
0answers
27 views

Unable to identify the colours on leaflet

var non_tfl_lines_JubileetoIlford = L.geoJson(non_tfl_lines_JubileetoIlford, { pointToLayer: function(feature, latlng) { switch (feature.geometry.type) { case 'LineString': return new ...
1
vote
1answer
68 views

Is the Azimuth on the equator equal to the one not on the equator?

I am trying to fully understand the concept of Azimuth and I am encountering some inconsistencies (or maybe it is my error). I show you some examples that do not match, hoping somebody can explain me ...
1
vote
1answer
134 views

Adding popup to geojson layer based on feature property?

I'm using leaflet and trying to add a popup to a point on the map that will return a property of the point from the geojson file. Going off this post has been helpful problem adding pop-up to GeoJSON ...
0
votes
0answers
77 views

Run-time substitution on MapServer with Leaflet

I have a MapServer instance and map file displaying data in selected countries using a Leaflet WMS tileLayer. This map file works to display points from a single country (showing the LAYER definition ...
1
vote
3answers
225 views

Is it possible to create a tooltip with a map service?

I am trying to modify the ESRI Parks Finder application to include a tooltip that shows the name of a park when you mouse hover over the icon. It is a map service. Most of the documentation I have ...
1
vote
2answers
57 views

WFS Spatial Operator Query - Crosses AND Within

I'm trying to query my wfs service with a polygon. I want the service to return both features that are inside the polygon and partially inside the polygon. However, when I use the "Within" spatial ...
1
vote
1answer
116 views

QGIS 2.4 plugin PyQT qWebview javascript interface problem

I have a QGIS plugin which contains a qtwebview and Javascript communication between the page and the plugin. It is working perfectly with QGIS 2.2 but not with 2.4 (both QGIS versions share the ...
4
votes
1answer
229 views

*Leaflet* mouse wheel zoom only after click on map

I'm working with the Leaflet JavaScript Library and attached a (working) map to my HTML Document. It is in the middle of the page, and when I'm scrolling down with my mouse wheel and arrive at the ...
1
vote
1answer
139 views

Converting shapefile to KML using JavaScript or PHP?

My client needs to generate maps from shapefiles. Through my initial search, I came to know that we need to convert shapefiles to .kml then we can generate maps from google maps. So I searched for a ...
4
votes
1answer
1k views

Does Leaflet has option for scale dependent layers?

Is it possible to show layers with Leaflet depending on scaling? For example not show counties until zoom level reaches 10. Thanks.
1
vote
1answer
81 views

How can I add a popup on hover for a graphic using the ArcGIS JavaScript API?

I created this JSFiddle for an example. Currently, a user needs to click on the graphic point to see the attribute. How can I make it so the user only needs to hover over the graphic for the popup to ...
0
votes
2answers
46 views

How to get features from a Service Layer?

I am using a Map Service from http://watersgeo.epa.gov/arcgis/rest/services/NHDPlus_NP21/WBD_NP21_Simplified/MapServer/. It offers multiple layers and its a great resource. I'm wondering if its ...
1
vote
1answer
75 views

Dynamically changed url in my Vector layer protocol not taken into account after refresh

I have a map which I try to change dynamically its url when the user clicks a radio button. Here is my code : var refreshLayer = new OpenLayers.Strategy.Refresh({ force: true, active: true }); var ...
2
votes
1answer
71 views

Display a link in a popup with Leaflet

Hey there! Im working with the Leaflet javascript library. There should be an option to click on my map and view a popup. I already have a code for that: var popup = L.popup(); function ...
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
91 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
77 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
78 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
149 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 ...