Google Maps is a web mapping service application and technology provided by Google free (for non-commercial use),
34
votes
5answers
3k views
Why is the 'straight line' path across continent so curved?
This is the result of mapping the straight line path from a point in US to Poland using Distance Measurement Tool.
Also, planes from Asia to US would travel almost over North Pole.
Why is the path ...
10
votes
4answers
511 views
Suggestions for simple mapping platform for alumni web site
I'm working on a proof of concept alumni site with a WordPress backend. I want to have a very simple map that shows where alumni are living. I'm thinking something like the Bing API or a simple open ...
5
votes
1answer
2k views
Create drive time polygon around a map point
I'd like to create a 30 min drive time polygon around 400 separate points I have plotted to google maps.
I have discovered http://www.freemaptools.com/how-far-can-i-travel.htm but this seems to freak ...
5
votes
4answers
3k views
Can you make a travel region polygon with with Google Maps API?
I am working on a local design project and need to determine if someone is local to my area to allow them to participate. Local, as defined by the group, means that the person is within 2 hr driving ...
4
votes
2answers
318 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 = ...
33
votes
3answers
8k views
What is the current Web Mercator projection code?
The web mercator projection, popularised by Google Maps, seems to be given a new EPSG code every couple of years.
EPSG:900913 (Google in calculator text) was an unofficial code
EPSG:3785 - is the ...
14
votes
3answers
10k views
How to add Basemaps from Google or Bing in QGIS?
Like ArcGIS Desktop has the option of using basemaps from ArcGIS online, does QGIS have any such options?
15
votes
5answers
5k views
Map projection in OpenLayers
I want to overlay some data whose projection is WGS-84 on Google map layer in OpenLayers. But I just can't make them in the right place. I did as follows:
map = new OpenLayers.Map('map', {
...
6
votes
4answers
1k views
Point in polygon algorithm for multiple polygons
I've a Google map with bunch of polygons on it.
Here is a problem I'm interested in: Given a lat,lng point, what's the best way to determine all the polygons that this point lies in?
The obvious way ...
5
votes
3answers
1k views
Does a national(USA) interstate rest stop/rest area dataset exist?
And I don't care about format--worry about that later! I found some maps in Google maps, usually per state. I also have one map made my someone else, that no longer appears in the Google Maps search ...
2
votes
2answers
2k views
Calculate bearing between two decimal GPS coordinates
I'm building a virtual tour application that uses custom panoramas in conjunction with Google's StreetView service. With StreetView, you can have 1 to n links at each particular location to move to, ...
7
votes
5answers
685 views
Buffers of public transportation transit times
I'd like to be able to create buffers/zones/rings of transit times using Denver's public transportation system. For an example of what I'm talking about, check out triptropnyc.com - I don't need it ...
4
votes
1answer
118 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
4k views
How to highlight the area in google map on mouse hover
I want to implement a feature in my app (gmap powered) to highlight the area on mouse over. Much like the functionality in wikimapia. Check out the pic
or url
But i could't find any info on how ...
2
votes
1answer
131 views
What is the best API to use GeoTools or uDig (for the context of my application)?
I am trying to develop a java application that displays : Google maps, Openstreetmap and Bing Map Data.
So which is the best SDK to use in this contet Geotools or uDig ?
7
votes
9answers
11k views
Is it possible to expose Google Maps as background map through ArcGIS server?
I am doing a (non commercial) project where the client doesn't have the budget for purchasing map data like that provided by TeleAtlas. They only need map data for a background map, and they'd like to ...
3
votes
1answer
117 views
How to place markers on the outline of a circle in google maps?
I have the center of a circle and it's radius and I need to place variable amount of markers on the outline/stroke of the circle. The distance between this markers should kept same, so if I have 8 ...
2
votes
4answers
5k 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 ...
30
votes
4answers
3k views
Why has Web Mercator (auxiliary sphere) become the web map standard?
I understand what the difference is between the Web Mercator projection and Web Mercator Auxiliary Sphere (WMAS). I also understand that both Google and Esri have adopted this projection as their ...
15
votes
6answers
6k views
What's next if our KML is too big/complex for the Google Maps API?
Our web app includes simple mapping capabilities (currently just markers and KML overlays on an embedded Google Map). This works pretty well; the only real limitation we face is KML overlays that go ...
11
votes
4answers
264 views
Geocoding API Comparison
Is there a good updated source for comparing existing Geocoding APIs (i.e. Google, Mapquest) and their features?
I'm really interested in their language support as well. For example, Google has ...
15
votes
5answers
25k views
Display a local file in Google Maps
How can I get a KML/KMZ file to display on Google Maps without a public facing web server?
14
votes
3answers
913 views
What is the wire format for Google's new vector map tiles?
Google recently released new vector cartography for their mobile maps. I'm curious if anyone here has any insight into the wire format they use for transmission? I've experimented with a few formats ...
8
votes
4answers
1k views
How to Geocode a City
First, a little disclaimer.
I know that I can just call one of any number of geocoding APIs to perform this for me. This is more of a curiosity than anything else.
With that aside, how does someone ...
7
votes
2answers
2k views
EPSG 3857 or 4326 for GoogleMaps, OpenStreetMap and Leaflet
The discussion at What is the difference between WGS84 and EPSG4326? shows that 4326 is just the EPSG identifier of WGS84..
Wikipedia entries for Google Maps and OpenStreetMap shows that they both ...
9
votes
4answers
958 views
What is a “mashup”?
GIS users mix spatial data layers from an early age of GI science.
What is new in the concept of "mashup"?
Is it something really new, or only a trendy word?
9
votes
9answers
4k views
Algorithm for finding irrregular polygon centroid (label point)
I need to find a centroid (or label point) for irregularly shaped polygons in Google Maps. I'm showing InfoWindows for parcels and need a place to anchor the the InfoWindow that is guaranteed to be on ...
5
votes
4answers
1k views
How to scrape data from a google map (in flash)?
I've contacted the author of this NYC homicide map from the NY Times several times to see if he could send me a spreadsheet of information the data is based off of, but I have not had any response ...
8
votes
4answers
2k views
Geocode address once in google maps, save in database, read geocoded result from there on
Is it possible to geocode an address, save the result in a database, then read that result from there on?
I'm using a Google map that is geocoding hundreds of addresses which obviously hit the ...
8
votes
1answer
3k views
Using Drop Markers and MarkerClusterer together?
I want to create a rather visually appealing representation of time-series data (Costco Store Locations w/ opening dates).
My idea was to plot them on a map, in time-series, but it seems that the ...
6
votes
2answers
1k views
Generate a kml file from Google results
Is it possible to generate a kml file of searched items in Google Maps. For example:
Search for highschools in Virginia
Return the results as a kml file with the schoolname address and location
5
votes
4answers
826 views
What is a best practice way to display/feed US census/tiger data into Google Maps API?
Let's say I want to display age, income, etc based on census block groups on Google maps.
What is the best practice or recommended way to do so and also to allow to do simple queries?
4
votes
3answers
3k 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 ...
0
votes
1answer
284 views
How to adjust the difference between the coordinate from OpenStreetMap and Google Maps
I have downloaded the OSM from OpenStreeMap that came with all nodes from the map and their respective coordinates. Now I have to plot a node (latitude and longitude) on Google Maps, but all ...
13
votes
2answers
1k views
How can I fix my complex Polygons so they show correctly in Google Maps?
Problem: I'm trying to find a way to fix some broken polygon shapes and I'm not sure how I can do this.
Details:
I've got a number of polygons which I basically imported from TIGERLINES a while ...
11
votes
8answers
3k views
What methods are there to produce map tiles for google maps?
newbie to stack exchange here.
I'm currently using the automatic tile cutter found here to make the standard 256x256 tiles required to make a custom map type for my map. The map tile cutter script ...
6
votes
1answer
1k views
Add a OpenStreetMaps road data layer on Google Maps API v3
I've successfully embedded a Google Maps API v3 map on my site, and added OpenStreetMaps (OSM) as the base layer. Is it possible to use Google's tiles as the base layer, and then overlay street data ...
6
votes
1answer
554 views
What causes these shiny artifacts in Google Maps imagery?
Do you know what causes artifacts like this one:
Source: ...
5
votes
3answers
1k views
How to toggle Fusion Tables layer on/off based on map scale?
In the Google Maps API v3 I'm displaying points derived from a Fusion Table by specifying a FusionTablesLayer
Is it possible to set a minimum/maximum scale on this layer, so it turns off when zooming ...
1
vote
1answer
550 views
Googlemaps Layer on Openscales
I'm using openscales in a web mapping project, i would like to add a Google maps layer, i know that there's some licence problems , but i don't care for these licence issues, i'm looking to add ...
1
vote
1answer
630 views
How to unproject coordinates on a Google map with Openlayers?
Below is my code and a pic. When I finish making my circle on a Google map with Openlayers, I get the following coordinates but I want coordinates like E.G:
bottom: -27.762124575762
left: ...
4
votes
3answers
3k views
Solving the Point in Polygon Problem Using Google Maps and Fusion Tables
The Point-In-Polygon problem is fairly well documented on this forum. My question is if there is a way to use Google's free tools, i.e. Google Maps, Fusion Tables, and possibly Google Refine, to solve ...
4
votes
2answers
5k views
Why can't I “turn on” a map view in Google Earth?
Why can't I toggle between map view and satellite imagery in Google Earth as I can in Google Maps?
Is there an easy way to add Map View to Google Earth?
4
votes
1answer
3k views
register event “loadend” on layer
I'm trying to register a listener event on "loadend" for my google maps layer on OpenLayers. But for some reason it's not firing. There must be something small i'm overlooking. What is wrong with my ...
4
votes
1answer
1k views
Google Maps API: Is there a way to do proximity analysis to POI
Using Google Maps API can I do proximity analysis, for example:
In a state, let's say Virginia, display all the points that are 500 ft/m from a POI such as McDonalds or Bob's Diner, 1,000 ft/m from ...
3
votes
1answer
153 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 ...
3
votes
1answer
156 views
Google Earth/Maps aerials via arc2earth producing cuts in PDF output
I just purchased a month of arc2earth. They provide Google imagery backgrounds with great resolution and display fine in ArcMap but after exporting to PDF they have these triangular cuts as seen here: ...
3
votes
1answer
905 views
Pan & Change Zoom to show Fusion Tables Query Results in Google Maps JavaScript API V3
I've created this map -- https://s3.amazonaws.com/pdb.files/lookup_auto2.html -- using Google Fusion Tables and Google Maps API. I'm attempting to modify the code so that the map will pan and zoom ...
2
votes
0answers
777 views
Converting projected coordinates to google maps pixels
I have a single polygon in a local projection system. I would like to convert that polygon into an image that can be used as an overlay on google maps. I understand that it may be better to use ...
2
votes
1answer
990 views
sharpmap overlay mapinfo on bing/google
I want to use sharpmap to overlay a mapinfo tab file onto google or bing.
I have it working pretty much at the moment however the co-ordinates that bing/google show are in correct so my mapinfo file ...
