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

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400 views

Why Haversine formula and Web Mercator give different length between two latlng points?

I am calculating the distance between two points given by latlng. However, Google Maps (i.e., web mercator projection) gives me a longer distance than Haversine formula. Which is the most accurate ...
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1answer
197 views

Google Maps base map definition

I need to replace a 'Global Imagery' basemap in Google Maps. However if I replace it with "Openlayers.Layer.Google", that would use map projection of EPSG:3857 (900913). But I'm working with EPSG: ...
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197 views

GEO polygon tool to extract data from map

I am developing a media portal and trying to define the circulation / broadcast area for the media (newspapers/magazines/radio/television) and extract states/cities/towns within the defined area to ...
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1answer
245 views

Google bathymetry service with OpenLayers Mouse Position

After searching for some days I decided to post this question here, hope someone else can give me some hints about a doubt I have. The thing is that I would like to use the Google Bathymetry Service ...
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2answers
601 views

How to create/obtain district data for Singapore? [closed]

I am newbie in GIS and have started using QGIS. I am hoping to map all districts of Singapore and create a Shapefile and get GeoJSON details for all districts. I am not able to find that currently. ...
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3answers
691 views

offline google map on android

If I go to abroad as a tourist BEFORE I collect the visiting places on my google maps then export it to kml. In abroad I don't use mobile internet on the street (very expensive) but I would like to ...
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0answers
159 views

How to create non-overlapping polygons from points or lines in Google Maps?

The picture describes the problem. I'm supposing I need a tree search algorithm that enumarates all the points and connecting lines in a tree structure and then searches for cycles. But this job is ...
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3answers
2k views

Ways to extract DEM for urban areas using Google Maps?

Is Google maps' elevation API suitable to obtain the high resolution elevation data for areas that have 3D building such as Manhattan? Would the API for example yield a significant different value on ...
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1answer
56 views

Is there a way to overlay a remote kmz file in google maps

I have a kmz file and want to overlay it on google maps. What I'm searching for is sth. like: https://www.google.de/maps?kmz=server/tour.kmz I've already checked the query params for google maps, but ...
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1answer
183 views

Save KMZ or KML from google maps

How to save to KML or KML file using google maps. I can't find menu command like that. I'm working on China region.
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1answer
97 views

Supposing Google uses GTFS format for Directions service, how does it represent the actual bus route?

So I am actually taking a look right now at Google's GTFS format for public means of transport. But from my point of view, I can see information included about the position of the bus stops and some ...
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1answer
799 views

DLS Grid for Province Alberta (Canada)

I have DLS grid data that I downloaded from http://www.altalis.com/products/property/ats.html (AltaLIS_ATS_V4.1_Coordinates data). But I don't know how to draw the grid on Google Maps. We have ...
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1answer
229 views

Google Earth Image Offset?

My lat/long points have an offset (2-3 meters) in both X and Y - about 2m SE in my region (-120.644,35.260) - from where the points used to be (unless my memory is failing.) I'm using Google Earth ...
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1answer
419 views

Google maps to gpx

I have taravel map created in google maps. Now I need to save way points in GPX format to make them available for my GPS Osmand application. How to solve this problem?
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1answer
160 views

Postgis ST_Distance query returning inaccurate results

I am using the following query to retrieve records from a postgresql DB @services = Service.select("*, ST_Distance(services.lon_lat, ST_GeomFromText('POINT (lat lon)', 4326)) as ...
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0answers
36 views

Get next point horizontally and vertically

I am working on a map application. We have to draw polygons for different sections. Each section is either a square or a rectangle. Data that I have has less than 4 coordinate points, insufficient to ...
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0answers
138 views

How/Where to get reverse geocodes up to 5 decimal points precision for offline use?

I would like to have a simple text file(s) with following reverse geo-codes information for all the countries (i.e. world): Coordinates -- Address e.g. 12.96779, 77.65306 -- #7, Jeevan Bima ...
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0answers
36 views

Embed Google Fusion Table Map without setting it as public

I would like to make use of Google Fusion Tables and Maps to visualize sales data. The map will eventually be embedded into a webpage so that senior management can access it for decision making ...
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0answers
786 views

How to draw small circles within a big circle(greater radius) on the basis of marker size on google maps?

I have more than 1000 markers at different location in my Map. I read Lat and Long from a xml file and render it in Google maps and create circle over them on the basis of city name within given ...
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2answers
100 views

SRID is messed up when google-maps layer is added

I've some problems with using a PostGIS layer within QGIS. First of all, I had this same problem on both QGIS 2.4.0 and 2.6.1 I cannot display the Google Maps layer AND my PostGIS layer together. ...
0
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1answer
108 views

Hierarchy for Google maps and OpenStreetMaps [closed]

i am wondering about the hierarchy that have been used inside the Google maps and open street maps.. what kind of hierarchy was impeded inside of them ??? if a curious man like me would like to ...
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1answer
87 views

How to align ASTER GDEM with Google Maps?

I'm using ASTER GDEM V2 to pick heights at lon-lat coordinates obtained from Google Maps but I found that at some locations - particularly San Francisco: https://goo.gl/maps/w7p1K - the DEM seem to be ...
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0answers
35 views

What are the rectangular black markers shown in the roads of Google maps?

I'm doing some image processing to quantify the connectivity of London's roads. I'm not a geographer or map-expert and I would like to know what are the black rectangular nodes/markers in this map. ...
3
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3answers
696 views

Plot Canadian (Alberta Province) township, range, and section data on Google Maps

We are working on a project where we need to plot some part of Canada (Alberta) over Google Maps. We can plot maps on Google with coordinates (lat/long) or geometry values. But our client provided us ...
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0answers
107 views

Raster overlay with different projection in Google Maps

I have a map created with Google Maps. I want to overlay over some data I am downloading dynamically, covering the whole world. That data is a matrix as follows: 1024 values for the longitude ...
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0answers
135 views

Add QGIS raster layer to Google Maps API

Is it possible to add a hosted QGIS Raster layer into a Google Map? Thanks.
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0answers
73 views

Bulk Converting Ordnance Survey to Google Map lat lng

Apologies if this is a simplistic question, I am learning! I am attempting to use pyproj with Python. The coordinates I wish to convert came from the Ordnance Survey Integrated Transport Layer. I ...
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0answers
46 views

Google Maps Data

Is it possible to obtain a dataset of all search results in a google maps search? For example: if I want a list of all gas stations in Chicago, complete with addresses, store name, latitude-longitude ...
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0answers
81 views

Live routing with instructions is show in a windows info if click in road

I have make a web application , the application have in a server a database in Postgresql with a table roads , i have make a php with pgRoutong query , in the web site the user give two points , or ...
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1answer
91 views

CartoDB / ArcGIS online map to show roadworks in a city

I want to create a map that shows roadworks based on start and end time in the City of Aarhus (second largest city in Denmark) using CartoDB (or ArcGIS online) similar to http://roadworks.org/ - I ...
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0answers
30 views

What is the correct way to show 10000 maps/tiles on my contact address list web page?

I have a webpage with a grid of contact list (around 10K people). I want to put in one of the columns a small map/tile of the address from a different column. Do I need to generate 10k maps object and ...
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0answers
146 views

Accessing Time-Enabled Layer/adding time slider to webmap using google maps as basemap

I have the wireframe that I need for my webmap along with the arcgis map service layers (with time enabled data). I want to have two map divs with two time sliders that use the same service layer in ...
2
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0answers
118 views

Stretching of geometry when rasterizing vector data on Google Maps

I'll start with a quick backstory on what I am trying to achieve. I'm working on an offline Android GIS tool and people are throwing giant datasets at it. It converts these into Google features (V2) ...
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1answer
231 views

Displaying postgis database data

I'm a beginner in this field and tried to display the postgis database data in localhost.But i used select query in my code .so the table got displayed.I want to display the geographical points in a ...
0
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0answers
177 views

Scaling Images with OpenLayers

I have the same image (exactly the same dimensions) in Google Maps as in OpenStreetMap, but the scaling of the image in OSM is totally different. The scaling in Google Maps is after my opinion the ...
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0answers
109 views

How to show hierarchical clusters in google maps or other tool?

Google maps marker can be clustered but those clusters expand on different levels. I want to stay on a specific zoom level and cluster a set of markers. Then I want to show sub clusters inside that ...
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1answer
1k views

How to store Google Maps DrawingManager Rectangle overlay in PostgreSQL Postgis GEOMETRY(GEOMETRY, 4326)

What is the correct way to store a Google Maps DrawingManager rectangle overlay? The API basically provides me with NE & SW lat/long coordinates. Should I use BOX()? Is it possible to create a ...
0
votes
1answer
106 views

Offline map with less zoom size and maximum area covered

I am developing a mobile app for which an offline map is required. Is it possible to have such map within few 10s of MBs? The requirement is to have: Map with smaller zoom size; e.g. In this URL of ...
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1answer
106 views

Plotting a list of towns in google maps or CartoDB

is there a way to plot a big (700) list of towns on google maps. I don't have any geographic reference, just their names in a .csv file. I've tried uploading using their help pages but it just seems ...
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0answers
83 views

extract lake outline in google maps

I have some bathymetric data for a lake, shown here in google maps: ...
4
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4answers
3k views

QGIS exporting attributes in a KML file

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

Geocoding accuracy of Google Maps vs Tiger

I recently compared result of US Census Geocoder(http://geocoding.geo.census.gov/geocoder/) with that of Google Maps. For any given address both of them are giving different set of lat, lon. Why there ...
1
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1answer
737 views

Google Hybrid Map tiles won't load in OpenLayers when centered on certain position

Since the Google Maps API update to V3.2 (17 Feb 2015) our maps have not been loading to their initial state, centered over the Gulf of Mexico. When the center location is: center: new ...
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1answer
153 views

Downloading data from Google maps-based apps

Is there any way to download customer’s data in Google maps based app? Like the polygons in this map - http://tromso-parkering.no/parkering/kartoversikt/.
0
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1answer
445 views

Which map API to draw polygon and export my data that is within boundary?

I have 5 point datasets that I want to display and be able to filter by fields. I will then be able to hand draw a polygon and export Excel of the data from each dataset within the polygon. Which web ...
1
vote
1answer
1k views

How to get boundaries of city? [closed]

is there any api to get bounds of city. What i want is i give city name and in return i get that city boundaries. I have searched google maps, arcgis and OpenStreetMap but didnt found any ...
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0answers
93 views

Rotated custom tile set in OpenLayers

I'm thinking of using Openlayers for an interactive map of a building. I'll have custom tile layers for each floor of the building's interior overlaying regular world map tiles. The building is on a ...
3
votes
2answers
385 views

Using ArcPy to zoom to Y,X (string) coordinate pair copy/pasted from Google Maps?

I frequently use google maps to find locations, and paste the coordinates into the "go to XY" toolbar in decimal degrees. It's a bit repetitive to paste the latitude into one box, and the longitude ...
2
votes
2answers
1k views

Working out street view heading

I was wondering if it is possible to work out a POV heading for street view based on a GPS coordinate? For instance, say I have the coordinate '43.6653055692 -79.3102166453' If I plugin the ...
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2answers
1k views

Zipcode to Polygon/Boundry

Is there any API out there which can give me Polygon value for a zipcode? I really thought that it would be fairly easy for me given the number of Maps APIs out there. Either Google Maps API or ...