I have searched a lot on this topic, and have found no answers.
I have my own statistics package where I'm saving the geoip data of my users (along with a bunch of other data). I'm using the maxmind geoip library to get this information.
So, in my backend I'm visualizing this data as text that have basically two columns, one for the country name and another for the number of visits from the country.
I'd like to generate a map with this data.
something like a world map with the countries I have visits from highlighted.
Heat mapping would be nice, but not required.
I dont really care if it's generated with php (GD image library) or jquery, since I'm already using both those technologies for the statistics backend. But I'd REALLY like to do this without google analytics or their graphing APIs.
I will try to suppose. The way I would try do it ...
Get FullHD (or HighRes world map)
Coordinates I'd keep in WGS84 standard (float values, otherwise it is easy to convert)
I would try to approach real coordinates to the scale of image, but before this ...
The major part in this work is Math. I'm actually not a mathematician, but I know that it should be applied here and why.
Main goal here is to project coordinates on a flat surface, bec. WGS84 uses oblate spheroid as a reference surface (with radius = 6378137 m; flattering = 1/298.257223563), so it is not ideal circumference and it should be taken into account. + image should be GEO binded somehow (you should know coordinates of corner angles of this image #least. it is the easiest case if so).
Calculations for this case are not very massive, everything leads to the elementary plane geometry.
Here is the library that could help you working with geospatial data http://www.gdal.org/.
My advice to you, to consult some specialists in this field if you know nothing about it (maybe SatCom spec. or MobCom spec. in some university/academy) (or try Google if you are familiar enough with math and GEO) and to ask for a math model for projection of GPS coordinates to the flat surface and you will definitely get the answer.
If you don't need very high accuracy, try it yourself maybe you'll have luck.
You can try yourself in MatLab (more applicable in this case) or Mathcad if you know math enough and try yourself to position few points on the raster.
If you will find the answer in the nearest future, I would be glad if you post it here or share with me your solution for the particular case.
i need to finally answer my own question here. for anyone else who stumbles across this:
i have been using the d3js library with the topojson extension.
https://github.com/mbostock/topojson
Related
i want to add wind data on my leaflet map as a layer
wind data like this https://danwild.github.io/leaflet-velocity/
I've been working on something similar. I found a pretty good looking
and intuitive method being used to represent vector information. Have
a look at the following examples:
http://earth.nullschool.net/
http://hint.fm/wind/
http://air.nullschool.net/
http://googlemapsmania.blogspot.com/2014/07/the-growth-of-slippy-wind-map.html
In my case, I still need to find a suitable format for the wind/ocean
data I want to plot on my Leaflet map. It's certainly not a quick fix,
but man, it looks great!
Maybe this can help you too. I hope to be able to post a working
solution soon.
This plugin takes input data in form of speed in knots (nautical miles
(1.852 km) per hour) and direction in degrees. It then generates the
wind barbs and outputs an icon. This icon can easily be added to a
Leaflet marker.
You can download it here:
https://github.com/JoranBeaufort/Leaflet.windbarb And you can see a
live example here: http://www.geonet.ch/leaflet-windbarb/
I am working on a project that I have array of GPS locations.
I want to know for each of those points, where are they?
I have a specific list that I am trying to match their location to one of those such as: Water, Highway, railway, ...
I tried this API (http://developers.cloudmade.com/wiki/geocoding-http-api/Documentation) but it doesn't give me any accurate data! even less than 50% correct!
Do you know any better solution?
I use php for server side that is responsible to gathering data from different webservices.
Our client sides are Android, Java
I expect system search and find the type of location automaticall
You don't give any hint of your platform (pc? smartphone? by hand? In automated program?)
But as a great starting point working with a few points by hand, in maps.google.com if you put the latitude and longitude (may be longitude and latitude try both) it will show them to you on the map. Google maps even has simple APIs so you can use this functionality reasonably simply (for example from a matlab program).
I'm thinking about a project, where I need such informations as described in the title. Does the Google Maps API provide something like this, or does anyone know how to get these informations?
Project will be done in PHP, HTML and Javascript.
AFAIK Google doesn't provide this information via the API. The only thing I can think of is getting the image, and then detecting the colour. A map of colour hex values against point type might give you what you need.
However, this may well break the Terms and Conditions, depending on what you're doing.
I am developing a sports website that would be keeping a record of all tournaments in tennis, football and rugby. Now my database structure is built to hold who plays who in which tournament, so it would just be a select to display all the information. The type of workflow that I am talking about is the one that is commonly used in the sports arena where players' names are listed head to head, and the level of that match(knockout,quater final, semifinal, etc.) are also listed. I do not know the correct term for this though. I will give you an example for how it would look.
I am sure this is possible by using web technology, I am just finding it hard on where to start. Any advice or suggestions are much appreciated. Also if there are any libraries I could use for this, that would be immensely helpful.
Depending on how you want to format the information you should be able to do it in a few ways.
You could use GD like you mentioned but that may be a bit tedious once you get larger and larger brackets. (I don't have a lot of exp. with GD but I know the basics)
I have implemented a 256 person ladder or bracket using html and css. This proved to be pretty simple to do and it should be able to scale easily and be easy to make changes to.
Well on a first glance I would see the following data:
Teams
Cups (having Rounds)
Rounds (of Matches)
Matches (of Teams)
You could model that into a relational database, e.g. MySQL.
You can then create models in classes for your application, e.g. in PHP.
You can then create a Web UI to display the data you've entered into the database. You can use GD for that (if it's a need, I think HTML is not that bad for that, would do it with simple text based output first before turning everything into an image).
Maybe that's helpful. Was a bit lengthy for a comment, so I added it as an answer.
Google maps has a function that lets you retreive the distance between two points: getDistance(), of the GDirections class.
Now, this is Javascript, so it'll only be able to calculate once the page has loaded.
My search form however, has the ability to indicate what's the maximum distance you want between yourself and another person and based on that, a list of search results has to be provided.
Since I can't use this function in PHP, is there another way for me to calculate the distance between 2 points on the earth? By giving up the street, postal code and city name, just like what Google maps needs.
This page has a list of google maps parameters for use in http connection. By specifying the output paramter you can choose to give back kml files or similar and can be used in any lanuage that can make http connections.
Looks like you want to calculate a Great Circle Distance
Formulas have been discussed here on stackoverflow before.
A point on earth is defined by it's latitude and longitude. If you want to calculate the distance between 2 points on earth by giving up the street, postal code and city name, you will need geo-referene data.
This data is available for free on the internet, but the accuracy and availability differ greatly from region to region. (USA data is of good quality, data for Kenia for example will be harder to come by)
So to answer your question:
Yes, there are other ways to calculate what you want. But they require more work/are more complex than just querying the google API.
You might want tot read: Creating a Store Locator with PHP, MySQL & Google Maps
Hope this points you into the right direction.
You can use kml file. It's xml-formatted file that you can recieve by link like http://maps.google.com/maps?f=d&hl=en&saddr=<src latitude>,<src longitude>&daddr=<dist latitude>,<dist longitude>&ie=UTF8&0&om=0&output=kml
in recieved file you can parse and summate distances from