Google Maps is a web mapping service application and technology provided by Google free (for non-commercial use),

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4
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1answer
496 views

Slight translation with coordinate-transformation from Gauss-Kruger to WGS 84. Possible Reasons?

I have a number of points in Gauss-Kruger, Zone 3 that I want to convert to display them within Google-Earth. Assuming WGS84 for Google-Earth the transformed coordinated differ from the original ones ...
4
votes
2answers
3k views

Create Fantasy Map

I'm currently looking to create a Fantasy map and share it with my friends. We have the map designed already in flash to certain degrees of detail and able to export as a vector. We'd like it to be ...
4
votes
1answer
753 views

How to find the nearest polygon from a given point?

Basically I have set of points [lat-long pairs] which defines different polygons on map. Now I have a coordinate [lat-long] from which I want to find the nearest polygon from that point. Any help ...
4
votes
1answer
519 views

Shapefile vs Arrays of coordinates to build Google Maps overlay?

I am very new to GIS, and my task is to overlay about 100 polygons on a map. I'm using Google Maps Javascript API v3. I think I can define all my polygons as sets of lat/long coordinates in my ...
4
votes
3answers
1k views

Is there any way to add a google maps layer in a qgis web client project?

Is there any way to add a google maps layer in a qgis web client project? I made a qgis project using a google maps layer from OpenLayers Plugin. In my desktop project, this layer works fine. But ...
4
votes
3answers
7k views

Using the Proj4js library to convert from Google Maps to projected values

I'm using the proj4s javascript library (based on advice from this question I asked previously) to convert lat/long values on my webpage. This page receives the lat/long values from google maps and ...
4
votes
2answers
144 views

Detecting trends in local business web services

Do you know any research paper about spatial data mining algorithms to retrieve trends about local business services (such as google places.. etc) let's say most rated restaurants this week.. etc ? ...
4
votes
2answers
6k views

Removing polylines from google maps

I have a point where a Gpolyline line is drawn from a marker to another point. After I click on it a second time, I want to remove the polyline. How do I remove the line after clicking on the marker a ...
4
votes
1answer
686 views

Google maps wms layer with 3857

I am adding wms layers to my google maps application. As Google Maps projection is a web mercator, I thought it would be better to request wms layers with srs=3857 (or equivalent) instead of the 4326. ...
4
votes
2answers
2k views

Can you use Google Maps offline, with OpenLayers?

I use OpenLayers, GeoServer and PostGIS in my application. Is it possible to have Google maps offline? No need to connect to internet to get it. I'm working to make my app working offline only for ...
4
votes
2answers
1k views

Openlayers - Vector layer polygon doesn't move in-synch with Google V3 baselayers

When a polygon is drawn on the map and the map is dragged, the position of the polygon relative to the GM V3 base changes. function init() { var map = new OpenLayers.Map('map'); var gsat = ...
4
votes
1answer
289 views

geodjango slowness and debugging

I'm using geodjango + postgres to display polygons from tigerline on a map. Pretty simple stuff so far. My issue is that when I use the GPolygon object: django.contrib.gis.maps.google.GPolygon there ...
4
votes
1answer
596 views

Google Maps: obtaining the border of an area

When using the geocode API it is easy to obtain the (centre of the) coordinates of the address. For example: Rotterdam. If you look up the same location in Google Maps you also get the surface area of ...
4
votes
2answers
1k views

From pdf to google maps overlay

First post, so be gentle. Context - I'm doing some research into healthcare provision and I'd like to visualise the data. I'd like to be able to put these PCT boundaries as an overlay to google ...
4
votes
4answers
8k views

How to use Google Maps V3 Geocode with Openlayers

How to use Google Maps V3 Geocode with Openlayers. Below is my code but the function does not execute when I try to integrate it with Openlayers. This works with my original google v3 file. Below is 2 ...
4
votes
3answers
4k views

OpenLayers: Showing a WFS overlay on top of Google Maps

I have found similar questions asked previously, but I still fail to get a simple WFS point layer to work using OpenLayers and Google Maps. The original code I used was based on WFS polygon layers I ...
4
votes
4answers
1k views

Why does this Mapserver layer not overlay correctly onto Google Maps?

I'm using mapserver to serve an overlay of weather data onto a google map (V2) and the weather data is not displaying where it should. The image below shows the problem i am having. The black lines ...
4
votes
2answers
1k views

Determine tile identity of tile set displayed on Google Maps/OpenStreetMap

I'm not sure if this is best way of approaching this, so I will explain where I'm coming from first. I want to load data onto my webpage containing a map based off a lat/long point. The only way I ...
4
votes
3answers
992 views

Google Maps with Tiled Image

I'm trying to get a weather image to display on Google Maps, however in my comparisons to others it seems as if my image is slightly to small (Vertically).. I'm wondering what I might have done wrong ...
4
votes
1answer
153 views

Google maps indoors submission

Does anyone here have experience with submitting Google indoor maps? I submitted one two weeks ago where the submission page stated "submitted for processing". (I submitted the indoor map on behalf of ...
4
votes
1answer
296 views

Pick random points in an earth circle

All I need is the ability to create random points within a radius of another point. so given self.fence.latitude and self.fence.longitude and self.fence.radius I should be able to generate random ...
4
votes
1answer
152 views

Why does the added raster layer have strange edges?

I'm using Geoserver in conjunction with the google maps API to add a raster layer onto a map. It loads fine, however there's some strange problem with opacity at the edge of the layer where you can ...
4
votes
1answer
4k views

Arrowhead in polyline google map v3

I would like to create a map, that shows a vehicle traveled path. The map should shows arrowhead for each turning. I need to show the map like this. I can create the map by following code var ...
4
votes
1answer
3k views

Overlaying WMS from Mapserver in OpenLayers with epsg:900913 from Google/Bing/OpenStreetMap

ADDED: Another curious effect is that no matter to what scale I zoom on the baselayer google/bing map, the WMS overlay is always the same-sized shot of MN. That is, as the baselayer map is scaled up ...
4
votes
1answer
5k views

Transforming EPSG:3857 to EPSG:4326

I am new to gdal and have a simple question. I want to transform an image from OpenStreetMap projection to Nasa Blue Marble projection. What I understand is that OpenStreetMap projection is EPSG:3857 ...
4
votes
2answers
2k views

What formula is used for distance between 2 points in Google Maps?

What formula is used by Google Maps for calculating the shortest distance between 2 points (having their Lat, Lng coordinates)? Is it purely based on Haversine? Or is it something different? Is there ...
4
votes
1answer
417 views

GPS tracking and Web mapping?

We are developing a tracking software and we are the stage where we test the reliability of our location stigma on the following web-maps Google Map Nokia HERE Open Street Map (OSM) We observe ...
4
votes
2answers
1k views

Rendering geoJson polygons in google maps android apiv2

I'm in the process of publishing spatial data stored in a postgis database to a google maps based android app and am trying to put together a plan for rendering my data in the most efficient manner ...
4
votes
1answer
572 views

Changing projection in KML from Google Earth to Maps

I have created a bunch of map tiles for Google Maps mistakenly using the Google Earth projection. Is there a tool available to batch warp the KML files to the correct projection or will I need to ...
4
votes
1answer
807 views

Google maps and Ordnance Survey derived data licence restrictions

Current Status: You can't use data derived from restricted licence OS data with Google Maps. There's been an on-going question about whether it is legal to display data derived from Ordnance Survey ...
4
votes
1answer
316 views

Interactive maps for a survey - Are there any tools yet?

i am working on a draft for an online-based survey. I would like to enable the participants of the survey to draw polygons, lines and points (several) on a basemap (e.g. google maps) and (extra ...
4
votes
1answer
162 views

How do you define rail network branch geocodes

As per the attached document I'm trying to define a rail network by providing geocodes for each rail stop, how would I define a 'stop' as a junction for a branch in the network without having to ...
4
votes
1answer
260 views

What are some options for embedding Google Maps into a WordPress site?

Background A non-technical user would like me to embed a Google Map into a WordPress-powered site. She needs the ability to add markers using a simple mechanism, and to link those markers to pages ...
4
votes
1answer
428 views

How to decode Google's proprietary latLon format for China?

This Google Maps link returns train stations in Shanghai, China. By appending '&output=js' it returns it in JSON format. I'm trying to decode the format Google uses for lat/lon: latlng:{ ...
4
votes
0answers
153 views

Advanced GMaps directions

I try to create an application for taxis. The application will be GMap based. On the map will be marked the region in which the taxi driver is working in. The region will be a polygon designed by ...
3
votes
2answers
851 views

Adding XY Coordinates from GoogleMaps to ArcMap 10

I have a list of lat/long coordinates in .xlsx format. I imported this table into ArcMap, but when I plot the points, they are not showing up in the proper place. Instead of showing up in South ...
3
votes
3answers
6k views

Which CRS to use for Google Maps?

I am trying to map a Shapefile (download) onto a Google Map using the Javascript API. The Shapefile describes the boundaries of NYC School Districts. The file's projection was Lambert Conformal ...
3
votes
2answers
6k views

How can I display this polygon in Google Maps, properly

NOTE: this question is sorta like a follow-on question to this original GIS Question I asked. In that question, the main suggestion was that I was trying to show two polys. Now, I'm asking about a ...
3
votes
2answers
1k views

Simplifying Shapefile using ArcGIS Desktop or alternative?

I have a shapefile that contains neighborhood boundaries that I want to simplify. Right now I am thinking of converting the shapefile to Google maps KML so I can insert the boundaries into the map as ...
3
votes
1answer
260 views

Can't get simple map to show up on my test site using CartoDB

So I'm trying to get a simple test-site setup but it's not working. Whenever I load the site I can very quickly see the controls flash on the screen then go away. The when not doing local testing, ...
3
votes
2answers
142 views

What software to use for political analysis?

Years ago, in the 1990s, I used MapInfo to do political analysis, voting histories and trends and the like. My knowledge is two decades old at this point, though. What are the tools I should be using ...
3
votes
2answers
370 views

Can one hide the Lat/Lng information sent to Google maps?

most services that use google maps have the Longitude / Latitude stored in the source to be sent to google maps to render their markers. However on this site (sorry Chinese) ...
3
votes
3answers
934 views

Can someone clear up a lat/long issue? with google maps/arcmap

I know a bit about lat/long, projected and geographic coordinate systems etc, and a bit about geodesy and datums, but I would like someone well informed to help me out. I have a lat-long in ...
3
votes
1answer
2k views

Arcgis Javascript latitude and longitude convert to WGS_1984_UTM_Zone_36N

I am using Arcgis Javascript api. I have two points comes from Google maps like this x:-111.67095840000002 y: 32.7558935 I wanna use this points on my Arcgis map. My map spatial reference is using ...
3
votes
3answers
619 views

Is it possible to check incoming GeoJSON to see if any of the features are identical to existing ones before adding to map?

I am working on a Rails/PostGIS app and doing a typical ajax call to retrieve GeoJSON within the map viewport bounds. Whenever the map is shifted or zoomed all of the markers are removed and then ...
3
votes
2answers
207 views

Where can I get public transportation route information for USA?

I'm trying to find a list of public transit route information, mainly location of bus and train stops for the US. I've looked around at some of the Google products and openstreetmap but can't find ...
3
votes
2answers
1k views

How to convert ESRI SHP to KML with correct coordinate system?

I am working on this SHP file, containing geographical district of Hong Kong. I would like to export this to KML and export it to Google Map for overlay. After I converted it to KML in QGIS (just ...
3
votes
2answers
1k views

OpenLayers with Google, Bing & MapQuest - Does it violate the terms of service?

to my understanding, you are not allowed to use the Google Maps API to display Google and Bing maps (Layer Toggle) (From the terms of service). However, I'm unclear if I can have an OpenLayers map ...
3
votes
2answers
398 views

Third party base layer other than Google map

Can we use third party base map (images tiles) for displaying vector data?, like we use google map as base layer for displaying vector data in OpenLayers application.
3
votes
3answers
864 views

Google Earth alternate tile set

I have a Google Maps compatible tileset running on a local server and I can browse this in a browser with the Google Maps API and OpenLayers. Can I force Google Earth to use this tileset so I can ...