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

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4
votes
1answer
2k 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
3k 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
434 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
120 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
289 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
509 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
158 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
148 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
222 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
1k views

Google fusion tables: Fill in lon/lat columns via geocoded address

I have a list of 100 companies that I want to geocode. I have all of their addresses but none of their lon/lat coordinates. I have three columns related to location: Address Longitude Latitude Is ...
4
votes
1answer
407 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
1answer
185 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
1answer
383 views

Generate tiles for google maps overlays

I am trying to show some information on Google Maps which would be in the form of translucent circle overlays. The problem is that some circles overlap, which results in increased opacity and blending ...
4
votes
0answers
108 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 ...
4
votes
0answers
792 views

Calculating compass bearing between two GPS coordinates… with a twist

I'm building a virtual tour application that uses Google's streetview code to render the panoramas into a non-distorted view. Each panorama has 1 to n links where the user can select to move on. I ...
3
votes
2answers
5k views

My house address isn't listed on Google Maps

When I search for my address on Google Maps it cannot be found which means I can't order takeaway etc. Is there a way of adding my address to Google Maps or even add a street address? I want the ...
3
votes
2answers
4k 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
101 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
863 views

Simplify Shapefile

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
2answers
301 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
121 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
88 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
186 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
109 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
642 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
835 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
346 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
587 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 ...
3
votes
2answers
57 views

UK area boundaries

I'm working on a web project that requires polygons and lat long coordinates for the boundares of towns, citys, countys and postcodes. Does anyone know where i can obtain this data? i know rightmove ...
3
votes
1answer
606 views

What projection to use for Google Maps?

I'm loading a WMS layer which comes in WGS84 into Google Maps. From what I've read so far, I should reproject this layer to Google Pseudo Mercator (either 3857/900913). However, when I save the layer ...
3
votes
2answers
3k views

How to display a PostGIS table on Google maps?

I am attempting to take a shape file and display it on a map: I can do something like this: SELECT ST_AsText((ST_Dump(the_geom)).geom) as the_geom FROM shapes; But the problem is I still have to ...
3
votes
1answer
1k views

MS SQL Server's STDistance output differs from Google Earth/Maps straight line distance

I am testing SQL Server STDistance function in the following way: DECLARE @g geography; DECLARE @h geography; SET @g = geography::STGeomFromText('POINT(53.553813 9.99158)', 4326); SET @h = ...
3
votes
2answers
2k views

Printing maps from OpenLayers with a Google Maps base layer

I need to implement an automatic pdf report generator on a web site. In the generated pdf file I need to insert images from maps extracted from OpenLayers with a Google Map base layer. On top of ...
3
votes
2answers
305 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 ...
3
votes
2answers
88 views

Google maps white striations / false artifacts

What are the common white striations running from NW to SE visible when you zoom in around 5mi scale? For example at (+81, -80)? But they appear 'all over'. Are they snow drifts? or satellite sweeps? ...
3
votes
1answer
185 views

How does Google Map API authenticate users?

They put a limit on the amount of map views, geocodes etc that can be done each day but in the documentation I can't find anywhere where they actually list how it is authenticated. My guess is it has ...
3
votes
1answer
713 views

Google Maps Decodepath change variable name

I have this code: var directionsService = new google.maps.DirectionsService(); var request = { origin : start, destination : end, travelMode : ...
3
votes
3answers
4k 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 ...
3
votes
2answers
972 views

Stylized map workflow: Illustrator to Google Maps / OpenLayers

The aim My current aim is to create a series of (heavily) stylized diagrams and maps. I'm not very familiar with any GIS software, so my weapon of choice would be to use illustrator for creating the ...
3
votes
1answer
209 views

Unexpected Result After Reprojection Attempt

I'm a member of a student team that is currently researching how to query raster information using PostGIS v2.0. Our raster's coordinate system is EPSG 2236 (NAD 83 / Florida East) and as we will be ...
3
votes
2answers
414 views

Openlayers using Google Maps as base layer: possible to zoom out farther than max extent?

See attached picture. This is how it is when the page loads. I'm currently using map.zoomToMaxExtent(); Everything is working pretty well but I'd like to zoom out more/see the whole world using ...
3
votes
2answers
155 views

Are there any good libraries for visually creating simple Google Maps?

I'm working on a simple webapp that lets the journalists I work with easily construct styled Google maps. In short, I need an interface that lets users place markers, set zoomlevel and choose a ...
3
votes
1answer
221 views

How do I find the intersection of two polylines in PostGIS?

I have a set of road conditions reported for small segments of road, and I am hoping to determine the specific subset of each segment which intersect with a route along the road so that I can draw the ...
3
votes
1answer
481 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. ...
3
votes
2answers
85 views

Where can I find a map with the location of towns and cities in Southern Sudan?

For a project I have some name of towns and cities in the Southern part of Sudan, the region South Kordofan. Many of these towns I can't find on Google Maps, but I need to know their location. ...
3
votes
1answer
222 views

Can I use QGIS plugins in PyQGIS as a stand alone script without iface?

Can I use a qgis plugin especially (openlayers plugin) in stand alone pyqgis script? I don't find examples, just code using iface but that cannot used in stand alone script.
3
votes
1answer
201 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 ...
3
votes
1answer
211 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
285 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 ...
3
votes
1answer
145 views

Can I customize a Google Maps layer in terms of content?

I don't want all features that come with the Google street layer. I just want basic infrastructure like roads, national parks, cities, streets with their names, etc. Everything that is public is OK. I ...