I have a two lists of locations....(via postcodes or long and lats), and would like to put two lists onto the same googlemap... but representas different colours..
It is a follow up to the original question
postcode distances using google
I.e. Is there a away to put up all the student locations and the school locations on a single google map represented as different colours?
maybe using googleVis?
Sounds like a "categories" map. Here is an example of a categories map from Mike Williams' Google Maps API v2 tutorial ported to the Google Maps API v3.
If you have a significant amount of data it would be impractical to show them all at one time. It would be better to show only one data type eg schools and if you click on an individual marker show the nearest students within a specific radius of that school.
The answer for your last question shows you how to find the coordinates required to display on map
Related
I want to use the script of Neveldo for Mapael in order to insert the regions in the map of France as well as the departments.
I can not nest the codes for the different JS files in each region provided in a single file by Neveldo: https://github.com/neveldo/mapael-maps/tree/master/france.
So I wish to keep the current interactivity of this map by including the regions of NEVELDO. http://cnecj.org/cnejc/annuaire/#cours-appel
The site VincentBroute.fr/Mapael does not give documentation and on the Github either.
Can you help me understand the architecture of this code and possibly give me a solution to nest: map of France, regions and departments?
thank you
I'm not sure what you are trying to do, so I will try my best to answer broadly.
In Mapael, a map is composed of areas. These areas are defined in the map file.
For instance, the map france_departments defines 95 areas, which corresponds to all (Metropolitan) France departments.
However, in the map france_regions_2016, it defines 12 areas which corresponds to all (Metropolitan) regions of France
This means that a map in Mapael cannot have the regions and its departments, because they would overlap and hide each other. This is because they are showing the same thing but with different level of details.
So, if you want to have the departments (in order to show details about it) as well as being able to recognize each regions, the best approach would be to use the map which has the most level of details you need (i.e. the one with departments) and group departments by regions by visually filling them with different colors (e.g. green for Normandie, yellow for Bretagne, and so on...).
I want to use some Google API to find a list of places within one hour from my location. I've found Google Maps Distance Matrix API but it only gives you the distance between places you specify.
What I really want to do is to paint an area in a map, I don't really need the list of places.
If I can't query by time maybe I can deal with distance (which is probably easier)
Thanks a lot!!
Ok, let me preface this question with the fact that I have created a lot of google maps, but they have been strictly markers and polylines denoting routes and a couple with some handler interaction.
Now I am looking to show basically a map of the world, mostly North America and I want to split this continent into my predefined regions with some lats/lngs that I have. Using these regions I want to draw something like a polygon with a light opacity and different color per region.
I then want to use marker clustering but I want the clusters to be specific to these regions. I have looked around but I haven't found an example like this. I have seen pages that say you can do this but not how you would go about doing this. Again, I am definitely a noob when it comes to drawing polygons and using the marker cluster. I know this question is fairly vague but just looking for an example/idea to start off of, and more so I don't want to write a bunch of code against this specific api and then find out that it is not possible.
Any ideas or suggestions are greatly appreciated....Thanks.
It can be done, but will require a rewrite of the MarkerClusterer (probably will simplify it).
You will need to determine how you are going to represent and load the cluster boundary polygons (KML, GeoJSON, native Google Maps API v3 polygons) and probably use the google.maps.geometry.poly.containsLocation(point:LatLng, polygon:Polygon) instead of LatLngBounds.contains to determine which cluster "owns" a marker.
So what I'm trying to do is the following:
Have a map (such as Google Maps or questMaps). It doesn't matter at all which API I need to use.
On that map have an overlay on the streets. So say (for example) the street has bad lightning at night, it will be colored red. If it has good lightning it will have a green overlay.
Based on the overlay the map creates a custom route (for example the user only wants to walk on the green/well lit streets).
I have no idea how to accomplish this (especially step 3).
First, you'll have to decide what data you need. How do you categorize certain streets as lit or unlit? What if some parts of a street are well lit and some have no lights? Do you need to know the location of every streetlight in your area? What if lights burn out?
After figuring out what data you need, you need to build your dataset. I'd be VERY surprised if this data already exists, so you will probably need to gather it yourself. Either go around town and take notes, or crowdsource the project, or figure out some other way.
Once you have gathered your data, learn the drawing API of whatever mapping tool you wish to use. They all should have functions in their API for drawing colored lines (for streets) or points (for streetlights) on top of an existing map.
Finally, learn the navigational API of the mapping tool you chose. You're right, this is a hard step. I know Google Maps lets you specify certain waypoints when requesting directions; maybe your app can calculate well-lit waypoints and feed them to Google Maps' Directions service to influence the route it generates.
Good luck!
For custom routing, you need to read up on "Graph Theory". This ignores the geography of the street map, and considers it as a set of junctions (nodes or vertices in the graph theory jargon) connected by edges. You can assign weights to edges - these could be lengths, travel times, ones and zeroes etc. Anything. They can have no relation to the position on the map.
So for your application, you'd assign a large weight to unlit streets, and a small weight to lit streets, then use a standard minimum-weight algorithm to get a route from one node to another.
I have a scenario where I have to highlight borders and shade a state or city after geocoding it (when I got the lang and lat).
How can I do this, do I need to have a complete information of a city to surround it with polylines? Or is there a way that map API can do this for me.
True. Google does not provide this feature. So what we can do... we can have the lat/long of the borders of the state. And we have to draw polygons ourselves.
I used this JS object. And changed it to Google map object (google.maps.LatLng).
For example:
var statesobj = {"AK": [new google.maps.LatLng(70.0187, -141.0205),
new google.maps.LatLng(70.1292, -141.7291),
new google.maps.LatLng(70.4515, -144.8163)]}
So, it's easy now. Loop on these lat/longs. And you can draw the polygons on every state of US.
So this is the solution I came up. If you guys know some better idea to do it. Please share.
You can also try Google Geo Charts:
http://code.google.com/apis/chart/interactive/docs/gallery/geochart.html
Google Maps API doesn't allow you to retrieve city borders. There are a couple other places from which you can get the coordinates, though:
Flickr API
There is a Flickr API based on photos that people tag, but it's only as accurate as the people who tag photos: so it's good enough for bootstrapping but probably not for production: http://karya-blog.blogspot.com/2012/12/fetching-city-polygons-with-flickr-api.html
Natural Earth Data
An accurate alternative is www.naturalearthdata.com. To get that data from there you just need to make two requests: one with the city name and one with their ID to get the parameters:
unlock.edina.ac.uk/ws/search?name=berlin&gazetteer=naturalearth&format=json
and then
unlock.edina.ac.uk/ws/footprintLookup?format=json&identifier=14126951
and you're set :)
Mapzen
If it's possible for you to pre-fetch the data, go for Mapzen, they have a full and pretty accurate database: https://mapzen.com/data/borders/
I'm afraid google maps API doesn't provide any means to access region (country, state, city, ...) shapes.
If you want to highlight regions you have to create custom overlays based on data acquired elsewhere.
Now the basic map example includes a "mashup" of data. When identifying data is fed to the web service, the resulting output can pinpoint locations on the map.
It shows how a geographic Map Marker is placed on the map to identify a specific location. Map Markers can use the default icon (shown) or a custom image, gauge, or even a chart. Optionally, the map can be configured to display a Map Marker Info window, containing additional location-specific data, when the marker is clicked.
It includes data-driven, colored regions (in this case, representing postal codes) overlaid a map of eg Washington, DC. Logi Info can work with GIS boundary data to produce region overlays for states, counties, cities, school districts, and other areas. Like the Map Marker, regions can be clicked to display a pop-up information window with detail data.