Is there any way we can query and get location data using mongodb geospatial query that matches the following criteria?   Getting all locations that are part of intersection between two boxes or in general two polygons.   For example below can we get...
When loading many feature footprint vectors onto the map, the openlayers map and web application becomes unresponsive.  Is there any way to improve the performance of the openlayers map with many vectors?    We would like to be able to support at le...
How can I perform a query on the database as per the user's location value? The application was developed with HTML5, CSS, Javascript, PHP has a database with columns as in the below table.    On the html webpage the users geo coordinates are col...
I am trying to render some locally-stored and vector-based tiles download from OpenMapTile. The reason I am doing that is because my end application will only run on a computer that cannot be connected to the internet.  I have read many different thi...
I'm trying to draw a google maps that has multiple Circle overlays, however I do not want to reveal the correct center of the radius.  So for example, myLatlng is my lat/lon center of the radius, I want to draw a circle not around it, but a circl...
I have this dataset which has ellipses, more specifically ellipse "envelopes." I was wondering if someone had advice on how I could draw these on a D3 map. I already have a map setup with mercator projection. This stackoverflow answer has a c...
I would like to implement a heatmap layer on top of a leaflet map with d3. I have around 2-3k datapoints.  My data is of the following format:  [{lat: .., lon: .., value: ..}, {lat: .., lon: .., value: ..}, ...]   Ideally I would like to toggle betwe...
I am developing an application where I have geospatial polygons like this:  var polygon = [{"lat": -19.939323, "lng": -43.928983},                {"lat": -19.939747, "lng": -43.933103},                {"lat": -...
In the context of a Google Map JavaScript application, what is the best way to get the magnetic declination for a certain Lat/Lon?   There seems to be no "easy" algorithm for that in JavaScript, or am I wrong? Is there a way with Google Maps...
I am attempting to run a Geo Box query using Mongoose however do not get any results. I have built out a simplified test case:  var mongoose = require('mongoose');  // Schema definition var locationSchema = mongoose.Schema({     userid: { typ...

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