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...
I am creating a map with about 1000+ points using Openlayers. Currently when I click on one point's icon, the description for the point shows up in a popup, and to exit the popup I need to click on the same point's icon again. Is there a way...
I am trying to use the ArcGIS 2.1 JS API to create a custom interface that looks similar to Google Maps.  What is confusing me (particularly with Dojo's layout scheme) is how Google Maps has a map pane that extends the whole width of the page and...
I'm attempting to create a TopoJSON file of school districts in the United States.  I have a set of three shapefiles that I am attempting to combine into a single topojson file, using the following batch script:  call topojson ^     -o SDs11_Topo...
I am looking to add a popup with geoJSON attributes to each book store marker on my map. I have used "layer.feature.properties.name" within the marker.bindpopup method, but am getting a return of "undefined".   L.mapbox.accessToken =...
This is my select option.      <select id="sel_dist" onChange="seldist();">     <option value="layer1" selected=selected>None</option>     <option value="layer2">1</option>     <option...
I'm playing with the Google Maps API (v3) and I've run into an issue with marker icons. I'm trying to vary the size of my markers depending on their individual data attributes.  The icons themselves are in a sprite that contains three dif...
OpenLayers3 API has a map.on("moveend") , however I cannot find a movestart. Any one know how I can achieve this? Is there a equivalent event?   OpenLayers 2 had a movestart event on map. I am looking an exact parallel in OpenLayers3  Here...
It's been a few years since Jason Davies blew us away with Reprojected Raster Tiles—that map stopped working because Mapbox is blocking his site, but the Mollweide Watercolour and Interrupted Goode Raster remain great demos.  Now on Observable...
I'm trying to get mouseover to work polygons in google maps api v3. I've tried the answer provided in this post: google maps v3 API mouseover with polygons?  This answer should be working, but it's not for me. Can anyone spot the stick in...

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