Google Maps. Draw outline based on city - javascript

I have been trying to google this but with no luck.
Has anyone stumbled across some logics/functions to draw a nice area around a city automaticly?
Like the image below:

What you are looking for is Geo Boundary data. They hold the long/lat to create polygons around the desired city/state/area or whatever area you are looking for.
The U.S. Census Bureau Geography has downloadable files that provide this type of data for the U.S. World Countries - GIS Data has other areas world wide.

OSM has polygon data for level 2 administrative units (country -> prefecture -> county) as well, you can get them via either overpass (ttp://overpass-api.de/api/interpreter) or nominatim (https://nominatim.openstreetmap.org/search) interface. I've written a small tool to do so (https://github.com/tibetty/QueryGeoBoundary), you can find more how-to-do details from my source. After you have such data in hand, it will be easy to draw such polygons upon map 'coz most tools have api in place.

Related

Map creation API for fictional interactive maps?

I want to make an interactive map web application for a game that I play. Basically I want it to be a kind of Google maps clone, where I have a vector-based graphic of the region area and I can zoom in and out to reveal certain level of detail.
My research into map APIs has returned little results. OpenStreetMaps and Google Maps only allow custom maps with real geolocation data. My project requires the creation of a map with nonexistent locations. Does anyone have a suggestion on how to approach this? Thanks.
I think you can use "real" GPS coordinates and then customise the base layer beneath. The GPS Lat Long coordinates (between -90 and +90 each) offer as good a scale as any to then locate your fictional positions.
Google Maps has an API that allows putting custom layers and base maps here:
https://developers.google.com/maps/documentation/javascript/maptypes#CustomMapTypes
OpenStreetMaps will also allow this. Some recommended guides available here:
https://switch2osm.org/serving-tiles/
Good luck!

google map with area boundary or perimeter highlighted

I am trying to make map with javascript with city area highlighted.
Like below when we search in google maps.
I am aware of drawing polygon on google map.
But for this I need latitude and longitudes on baundary of area.
Any hints on this will be helpfull.
If this boundaries (kml or kmz) can't be obtained from google any direction for source providing them will be helpful.
From google this kind of information are not avalaible like suggested in comment by #geocodezip. but you can try search on the website of your national statistical institution or presiding over the management of cartographic information. In many countries it is available for free, or conditions of use that provide for free use, digital maps of all the administrative boundaries of the country. Often this information is available in the shape format but can be easily converted inf KML format using a product as free as QGIS (Quantum GIS)

Polygon in Leaflet JS at wrong position

i´m trying to create a map based on LeafletJS. I need some shapes rendered in the map.
I need - for example "Kreis Wesel" (part of germany) in my map. I downloaded shapefiles from http://www.gadm.org/country and imported them into OpenJump. Fine - they are displayed correctly in the GUI.
When i copy the area to clipboard an format id as JSON (with my texteditor) and parse it width 'L.polygon(var).addTo(map', the polygon is created correctly - but in the Indian Ocean, not in Germany.
Any ideas wheres my fault?
Well it seems you can find info in that previous thread
first two lines: " Is there a service that can provide custom tiles in the EPSG:4326 projection? I've looked at Cloudmade and it would be the ideal solution but their tiles are using Spherical Mercator"
The shapes you downloaded are in lat/lon coordinates epsg:4326 whereas your base layer OpenStreetMap uses Spherical mercator epsg:3857
Change your shape's epsg with your favorite GIS software.

how can I highlight/select different regions on google map?

I was trying to mark regions on google map for a city (for a small utility webapp, that I am writing). However, when I looked up areas by their name, I noticed something new. There is an outline around the areas. Like this(if you search for: "Koregaon Park, Pune, Maharashtra"):
Is there a way I can extract all these regions for a given city (in this case, Pune, India) ?
Can I add my own regions or edit regions as per my needs ?
In the end, I'd like the user to be able to select multiple regions and I'd like to collect that info, in an array or some other data structure ?
Can someone point me in the right direction on how to do this ?
PS: This is limited to a city for now, and the number of regions that I'm targeting are small in number(say around 10. This number will grow if my experiment proves out to be efficient).
Please dont downvote this. If you need me to provide more info, please do let me know.
You are asking how to display polygons for your cities on a Google Maps API map.
There are at least 3 ways to do that, but for all those you need the coordinates of the polygon.
KmlLayer - need the data as publicly available KML
FusionTablesLayer - if you have the data as KML you can import it into a FusionTable, if it is a .shp file you can use shpescape.com to import it into FusionTables
You can display the polygons as native Google Maps API v3 polygons
There is publicly available KML data in the Natural Earth Data set (which is available in FusionTables) and at http://www.gadm.org/

Highlighting whole street with some maps API

Is there any way to highlight/display on Google/Bing/(any other map provider) Maps whole street (from the beginning of the street to the end of)?
I know the existence of Polyline in Google Maps API, but it's just connecting two latitude points, and there is no way of making it automatic so I could display any street in some city.
Also I was thinking about Directions, but many street are 2 way, there is no guarante that you will mark whole street and it's just now user friendly. Example
You may want to check Mike Williams' article on how to snap points and polylines to streets with the Google Maps API:
Snap points (and polylines) to street
Especially this example:
Click on the map and a path will be drawn that follows the streets.
Take a look at OpenStreetMap. (Google and Bing won't let you access their underlying street data.)
You can show a map with OSM tiles, and use the API to query for the features you're interested in displaying on the map. OpenLayers is a javascript mapping library that could support this.
Here's a view of Chicago showing street vectors and other features overlaid on top of the map tiles:
http://www.openstreetmap.org/?lat=41.902104&lon=-87.626441&zoom=18&layers=B000FTTT
In Azure Maps you could access the vector tile road layers and use a data driven style based on the name of the road. Here is a tool that inspects the underlying data in the map tiles and highlights things that you click on. This has a lot of the basic functionality that you would need to achieve what you are asking for: https://azuremapscodesamples.azurewebsites.net/?search=inspect&sample=Inspect%20features%20under%20the%20mouse

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