Questions tagged [google-maps]

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

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161
votes
3answers
145k 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 ...
132
votes
4answers
277k views

Adding Basemaps from Google or Bing in QGIS?

ArcGIS Desktop has the option of using basemaps from ArcGIS online. Does QGIS have any such options?
81
votes
12answers
210k views

What ratio scales do Google Maps zoom levels correspond to?

Can anyone provide me with a link (or some details) on the actual ratio to "zoom level" figures for Google Maps? e.g. Google Maps Level 13 = 1:20000
55
votes
4answers
12k 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 ...
52
votes
6answers
31k 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 ...
47
votes
6answers
235k views

Displaying local file in Google Maps?

How can I get a KML/KMZ file to display on Google Maps without a public facing web server?
44
votes
3answers
17k 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 ...
40
votes
2answers
29k views

What is the difference between EPSG:900913 and EPSG:3857?

I'm using the QGIS google layers plugin to digitize a parcel as a shapefile. Later I want to import it to PostGIS. I know that google maps use a special 'google mercator' projection. What is the ...
32
votes
11answers
166k views

Avoiding Google Maps geocode limit?

I'm creating a custom google map that has 125 markers plotted via a cms. When loading the map I get this message: Geocode was not successful for the following reason: OVER_QUERY_LIMIT I'm pretty ...
31
votes
4answers
2k views

Donating and volunteering geographical knowledge? [closed]

I know a lot about the places I visit, and I want to share it with everyone. I have been donating and volunteering at OpenStreetMap, and I am also aware of Google Maps. Where else can I help with ...
31
votes
6answers
211k views

Export Google Maps Route to KML/GPX

Since Google pulled the plug on Google Maps Classic, I'm reluctantly moving to its Google Maps New application. However, I didn't find how to export a route to a GPX or KML file so it can be copied ...
29
votes
6answers
49k views

What's next if our KML is too big/complex for the Google Maps API? [closed]

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 ...
24
votes
6answers
13k 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 ...
22
votes
6answers
162k views

Changing default zoom in Google embedded map?

I am having difficulties to change the default zoom level when I open the iframe below in my site. Can anyone please help me to set zoom level when following iframe is opened? <iframe src="http://...
22
votes
5answers
17k 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', { ...
18
votes
11answers
73k views

How to Geocode 300,000 addresses on the fly?

I have a database which has 300,000 address, which are to be shown on map. I know if I geo-code all the address it will be too expensive for me. So I was wondering if it is possible to geo-code the ...
18
votes
3answers
2k 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 ...
18
votes
2answers
23k views

Which is correct projection in ArcGIS Server for EPSG:3857/900913?

I want to publish a mapservice in ArcGIS server, which will be overlayed on Google Maps or Bing Maps. For this, the Map Service needs to be in EPSG:3857/900913. The Google Maps projection is supposed ...
17
votes
7answers
5k views

Seeking Satellite Imagery Providers? [closed]

I'm building a web application - my requirements are: Must have global satellite imagery. Must have easy to use API's that are capable of geoJSON data imports, mouse and keyboard gestures, etc. To ...
16
votes
3answers
37k views

Where can I download the Google Road network as shapefile?

Is there any site from where I can get Google Road network as shapefile? As per my knowledge It is not distributed by google. So anybody can suggest how can I create this road network for a custom use?...
16
votes
3answers
17k views

Calculate lat lon bounds for individual tile generated from gdal2tiles

I have multiple tile sources generated using gdal2tiles I'd like to present on the same map. So when presenting a tile I need to determine which source to serve it up from, checking against the bounds....
16
votes
3answers
47k views

Google markers at same address not showing all markers

I've been working on this map - http://www.mediwales.com/mapping/test/ It's plotting companies fine and clustering them ok but a problem has arisen with companies in the same building with the same ...
15
votes
8answers
13k 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 ...
15
votes
2answers
14k views

Is it possible to gray out a Google Maps map except for some area?

What i am looking for is a way to emphasize a certain area on a Google Maps map by graying out the rest of the world. I heard about some solution of using 2 polygons of which 1 is visible and the ...
15
votes
2answers
5k 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 back....
14
votes
5answers
2k views

Quality of free geodata compared to commercial sources

What are the sources of excellent geo-location data as possessed by Google Maps ? I am wondering that, even with large amount of volunteer work involved, why is OSM data not comparable to theirs in ...
14
votes
3answers
797 views

How are Google serving up their Styled Maps?

As we all know, Google changed web mapping when they introduced Google Maps. At the time of writing this, tiled maps are now the norm with web mapping. For example, with ArcGIS Server, you cache ...
14
votes
4answers
7k views

Open source alternatives to Google's StreetView engine?

I am looking to create an open source javascript app using either Leaflet or OpenLayers. Is there any way to implement panoramic views (similar to Google's StreetView) into either of these, or any ...
13
votes
4answers
17k 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 ...
13
votes
1answer
3k views

Generating Heatmap from PostGIS

I have GIS data in a PostGIS data base and would like to generate a density map and display them on a Leaflet/Google Maps. Question: What is the recommended/typical method for doing so, without ...
12
votes
4answers
76k views

Creating drive time polygon around map point? [closed]

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 ...
12
votes
2answers
3k views

Technical and usability differences between OpenLayers and Google Maps API V3 [closed]

I know this is supposed to be a wiki question, but the feature has been taken of the site What are the main differences between OpenLayers and Google Maps api? What are the strengths and weaknesses ...
12
votes
2answers
3k views

Drawing Day and Night on a Google Map

I'm looking to plot day/night on a Google map, for an arbitrary point in time. I'm familiar with generating map tiles; I'm just looking for an algorithm to tell me whether a particular point on the ...
11
votes
7answers
27k views

QGIS exporting attributes in a KML file

Here is what I am doing: Create a layer by uploading a shapefile into QGIS Select attributes of that file Export selected attributes with the "save only selected features" check box when I save the ...
11
votes
2answers
13k views

Google Maps not Showing in QGIS 2.12

The Google Maps in my OpenLayers plugin in QGIS 2.12 does not show anymore. The other maps do show, that is: OSM Bing MapQuest Stamen Apple Maps I tried in QGIS 2.8 and Google Maps does not show ...
11
votes
4answers
27k views

Meaning of grey and yellow/brown colors of buildings in google maps?

I'm wondering what the difference beween those yellowish and the grey buildings is in Google maps. I can't find the answer by myself. I marked a few for example in the picture below.
11
votes
3answers
4k 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 ...
11
votes
4answers
4k views

Performance of google map tile creation processes

I know that question is rather vague but please bear w/me. I'm trying to get an idea of what sort of product performance - specifically timing - people have seen for various methodologies they have ...
11
votes
2answers
46k views

Can I view a Google Maps map by bounding latitude and longitude coordinates

With Google Maps I can enter a single lat/lng coordinate and the map is drawn with that lat/lng in the center. What I'd like to be able to do is enter two coordinate pairs, say the southwest ...
11
votes
2answers
54k views

Coordinate system and projection for georeferencing Google Maps image in ArcGIS Desktop?

I have saved Google Maps image (not Google Earth) of area at latlon(17.692437,83.218689) by some method in jpeg format. It is an exact snapshot of the Google Maps. Now I need to geo-reference it to ...
11
votes
1answer
8k views

Determining if two polygons are overlapping in Google Maps?

I'm working with google maps and polygons, but I have to validate that polygons are not overlapping each other. I have a function that returns TRUE when a point (lat, lng) is inside a polygon, but it'...
11
votes
2answers
2k views

Why does one part of GML -> KML conversion not work on Google Maps?

I have a client who wants to visualise cancer incidence and mortality rates by local/unitary authority across Great Britain. I've used Ordnance Survey data to get the boundaries of the authorities in ...
11
votes
1answer
164 views

What is Google Map’s knowledge of historic street names?

I am geocoding historic addresses in Ireland using Google Maps (free access) but in some cases Google Maps returns an address with a different street name. For example, when I enter the address of the ...
10
votes
3answers
11k 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?
10
votes
1answer
12k views

Applying custom Google map style in OpenLayers2?

Recently I stumbled upon this interesting article showing potential of adding custom styles to Google Maps. Some examples of styled maps can be seen here and you can design your own from scratch here. ...
10
votes
6answers
2k views

What is this “brown spot” in Google maps?

I was in Google maps today and noticed near Baltimore, US where the river is, there's a huge brown spot. Is this due to all of the waste? If so, will this keep going all the way into the ocean?
10
votes
4answers
87k views

Moving marker smoothly along two GPS coordinates

I am trying to animate a marker from one GPS coordinate to another. I am currently using Google Maps to achieve this and, although my algorithm seems right, Google Maps is doing a poor job at ...
10
votes
4answers
1k 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 ...
10
votes
3answers
18k views

How to calculate the optimal zoom-level to display two or more points on a map

We want to display several markers on a static map and want to calculate the optimal zoom-level like Google Maps does. We already calculated the bounding rectangle and the centerpoint of the map but ...
10
votes
1answer
409 views

Google Maps/Earth becoming GIS solutions yet? [closed]

I've been researching internet lately to make a comparaison between Google Geo solutions ( Google Maps, Google Earth) and other GIS solutions (Free of charge or commercial, QGIS, ArcGIS, etc.). I can ...