Develop Reference

Drawing polygons on Google Maps

I was drawing polygons using Polygon Creator Class on Google Maps. As you see this tool is not easy to use. For example, it's impossible to add new polygon or edit some of them after getting result code.
In following link when you zoom in between polygons you will see gaps that I want to remove. To recreate the issue please open following link and zoom in between polygons:
http://jsbin.com/bovogaqowu/1/edit?js,output
Now question is, how to remove gap between these polygons ? In this case I can't use the tool that I used to create this map.
And which tool is better to use in this situation ?
Thank for your time

I would suggest you using the Google's official tool for drawing, editing, locatiing and even finding driving directions for the markers you have placed on the maps. You can always save these edited maps and retrieve them later when you need them.
Please click the following link and get started!!
Even I tried drawing some polygons side by side and there were no gaps :)
Hope this would help!!

How do you create custom interactive areas on Google Maps?

I'm trying to create a map that shows county/district areas using Google Maps that will allow users to click on the area to retrieve relevant pop up information.
I have two datasets that I think would help, one being a list of UK Postcodes which would in turn allow me to determine different postal areas and the other is a dataset from Ordance Survey that contains province borders (county/district borders).
I've looked into KML Files and ImageMap but I'm not sure how to create these areas using the data I have?
I'm looking to achieve the sort of map that is used here:
http://content.met.police.uk/Page/YourBorough
Any help is greatly appreciated!
Thanks.

The way to work with Google maps is by using their api closely. You cannot go with simple image mapping.
Try those two links for starters:
https://developers.google.com/maps/documentation/javascript/examples/polygon-simple
and
https://developers.google.com/maps/documentation/javascript/reference#Polygon.
In short - you may need to draw a polygon for every area, bind a click event to it, then show Info Window with the relevant information for the user.
In case you're new to google maps, you may need to take more time inspecting their Api and the examples they give.
Best regards.

CFGMap Google map API V3 always center map on long/lat

I'm using CFGMap solution to place markers on a google map (API V3) but I want the map to always be centered on a certain long/latitude. Right now it seems to center on the last marker placed on the map so if the majority are where I want the long/lat centered then one random marker will take view miles away.
Any help on this is appreciated.
Thanks!

CFGMap is infuriating for it's lack of documentation. I don't use it myself; I only tried to track down something that might help you. On the face of it, it appears only to take a tiny subset of the full API functionality and doesn't offer much else.
From what I can glean from the testmap.js found here, it appears that you can only center the map on an existing marker in your locations array (see line 616 of the github file).
_cfGMapObj.resetCenterToLoc(index);
So, for example, in the source of the example is the line:
_cfGMapObj.resetCenterToLoc($('#locID','#printLink').val());
which grabs the number from the value of the current option in the select at the top of the page.
Now, if you chose instead to knock CFGMap on the head you could employ the Map API fully and set the center of the map using the setCenter method of the API.:
map.setCenter(new google.maps.LatLng(lat, lng));
e.g.
map.setCenter(new google.maps.LatLng(57.4419, -121.1419));
which in my mind is much easier. Plus, if you decided to do this, there are tons more articles on the API on StackOverflow than there are on CFGMap. YMMV.

Take an image from google map

I have a problem with google map now. That is I dont know how to capture a picture from google map. I developed my app which used google map api ver3 and it can show multiple markers, lines, my app's icons, circles and many things like that. So, it's hard to use Google static map API url such as
maps.googleapis.com/maps/api/staticmap?center=Boston,MA
&visible=77+Massachusetts+Ave,Cambridge,MA%7CHarvard+Square,Cambridge,MA&size=512x512&sensor=true_or_false
Hope everyone there suggest any solution for me! Thank you !
P/S: I used google map v3, asp.net.

highlight building google maps v3

Im trying to highlight specific building within a map using the google maps v3 api. I was wondering if anyone had any idea how to do this. I've been looking through google api documentation and come across nothing at the moment.
For example: http://goo.gl/maps/GyrDB - This is a map of a section manhattan, as you can see the 3d building. Im trying to highlight specific ones on hover.
Thanks :D

If you have information about where the building is, then you can use a Polygon to highlight it. If you don't have information about where the building is, then you are probably out of luck. The Google Maps API doesn't have any way of interacting with the map at that level.
Now, I suppose that one thing you could do is:
download the Google Maps tile,
find the point in the image that the user clicked on,
do a flood fill of that point with some awful colour,
set to clear all the pixels which are not the colour,
overlay that image on top of your map
You would also need to be clever about buildings which lie in more than one tile.
HOWEVER, this might run you afoul of the Terms of Use. I know that they disallow modifying the artwork; I am not sure if this would count as modifying the artwork; you'd need to look carefully at the TOU and maybe ask a lawyer. Or ask Google. (Don't ask me, I am not a lawyer.)

In many countries, every building is a cadastral parcel and there Web Map Service (WMS) layers showing them, provided for free by state bodies.
Using these layers, you can get building polygon coordinates. For ex: https://snag.gy/WtU7ZT.jpg