Google Visualization Api is very easy to use and effective. It has very well documentation, lots of examples. Google Visualization Api

It can work different data sources. Google docs as datasource is an another interesting point.

In this sample i used my georss formatted xml file as datasource. Json formatted data called by Jquery.Ajax from PageMethods  .

You can check this article as my starting point

http://www.aspsnippets.com/post/2009/09/04/Drilldown-Maps-using-Google-Geomap-in-ASPNet.aspx

in this sample we need

for Countries; Country(string),Countrycode(string), Visit(number)

for Cities; lat(number), lon(number),Visit(number) and City(string)

Because of Cities  located by latitude and longitude we don’t need to referance google map api. (if city names will be used, we need to add that)

these are my datatables that different from drilldown article:

for countries:

var data = new google.visualization.DataTable();
    data.addRows(response.d.length);
    data.addColumn('string', 'Country');
    data.addColumn('number', 'Visit');
    for (var i = 0; i < response.d.length; i++) {
        data.setValue(i, 0, response.d[i].Country);
        data.setValue(i, 1, response.d[i].Visit);
    }

for cities:

var data = new google.visualization.DataTable();
    data.addColumn('number', 'LATITUDE', 'lat');
    data.addColumn('number', 'LONGITUDE', 'lon');
    data.addColumn('number', 'Visit', 'Visit');
    data.addColumn('string', 'City', 'City');

    data.addRows(response.d.length);
    for (var i = 0; i < response.d.length; i++) {
        data.setValue(i, 0, response.d[i].lat);
        data.setValue(i, 1, response.d[i].lon);
        data.setValue(i, 2, response.d[i].Visit);
        data.setValue(i, 3, response.d[i].City);
    }

In api also we can create dataviews. You can hide and reorder columns or filter source datatable with dataviews. Below implementation for city datas.

var table = new google.visualization.Table(document.getElementById('table_div'));
    var dv = new google.visualization.DataView(data);
    dv.hideColumns([0, 1]);
    dv.setColumns([3, 2])
    table.draw(dv, { showRowNumber: true });

In master(country), detail(cities) structure; country codes using as key so they should be right. Also Country names should be recognized by api. (example for Russia you need to use RU as country name, otherwise not shown on country map.)

Here is the link of my GeoMap Sample (Click on the countries for city details and click zoom out for back)

Here are screens

Country Level Visitors Map

City Level Visitors Map

With the help of the Mapquest team (who contacted me via their Twitter – thanks!), we have some great information on how users can easily create a custom map, embed photos from a GeoRSS feed, and then embed on a webpage or blog (recall my last blog post on this topic where I had trouble locating the steps to do this).

First, get a map of your location of interest – for testing purposes I’ve elected to map Fort Collins, Colorado (yes, home of the Internationally renowned Balloon Boy). Next, in the very upper left area above the map, select the “Link or Embed” option.

A new window will pop up along with several options. Select the “Embed Option” – again a new window appears, then elect “Advanced Options” found at the bottom of this window. Finally, another new window will appear. Scroll down to the section with the “GeoRSS Feed” option and copy/paste the url of your RSS feed. This is where it gets good.

For mobile photo fanatics like myself, you may have a number or your photos archived on Flickr or Brightkite… both of these fine services support the creation of GeoRSS feeds. Please note, you will likely have to have your location sharing preferences for the photos set to share with the public, you also will have had to have uploaded your photos along with any relevant location tags and relevant information. This is likely the step that will throw many end users, particularly the novice mobile user who may not even be aware that location sharing and tagging options can be set to “ON” when capturing photos [with a camera that has integrated GPS] like make Nokia S60 smartphones (N95, N97 etc…) and the popular iPhone 3G S.

Finding a GeoRSS feed using Flickr is quite simple. For any user, simply jump to their photo home page, then scroll to the very bottom of the page. you will see an RSS feed logo and to the far right, notice the options for GeoRSS and KML. Simply right-click and copy the url or the GeoRSS feed and click “Load”.

Doing this will result in 2 things happening; on the mapquest map (above) you’ll now notice little RSS icons appearing on the map. Each icon shows a location where a GeoTagged photo is located and being pulled from the GeoRSS feed – click an icon to display the photo. Second, the code used to embed the custom map is made available at the bottom of the page – simply Copy/Paste this code into your web page.

For example,

http://api.flickr.com/services/feeds/geo/?id=81876992@N00&lang=en-us&format=rss_200

Then paste into the dialog in Mapquest under the advanced Embed options -

The following map displays the Flickr Photo GeoRSS feed

For those of you who are fanatical about sharing your location and geo-located photos with friends and colleagues, I suggest looking at Brightkite, an excellent application that I’ve used on Symbian smartphones and on iPhone 3G S – Brightkite is now also available for Android device users! Brightkite enables rapid “check in” where the user can update his/her location and check in along with a simple note and photo. Your Brightkite status gets updated, the photo stored in your image collection, and a handy map is presented along with your photos. Perhaps best of all, Brightkite integrates with facebook (via facebook connect) and Twitter so when you update your Brightkite status or location you can optionally send a Tweet to Twitter, with a link to your photo. There’s also a handy Flickr Connect where your Brightkite photos are automatically sent to a Flickr account and Set of your choice – handy!

My account can be found at http://brightkite.com/people/gisuser (Go ahead and friend me if you want)

To locate your Brightkite GeoRSS feed go to your brightkite homepage and see the right sidebar lower area – notice icons for RSS and KML. Once again, you can copy and paste this GeoRSS feed url into mapquest to display the photos on a map (Of note, if you happen to be a Google map user you can easily display on a google map by pasting the RSS feed url into the search dialog on the maps home page!

Storm Clouds (photo by Flickr user Kuzeytac)

Following up on a previous blog post regarding putting faith in cloud based services comes the bombshell that popular UK based postcode search API supplier website Earnest Marples has been closed down via a Cease and Desist order from the Royal Mail. The previous post mused about what would happen if/when a service that was relied on by other services stopped and this is a prime example. Following this announcement the public service, non profit websites PlanningAlerts.com and the Straight Choice, as well as a number of others, are no longer functioning. But this has had a bigger impact still – TwitterPlan, developed by Stuart Harrison of Lichfield DC, and the Planning RSS feed and map for City of Lincoln Council are no longer available (okay, so it turns out that they do work, however their future rests in the balance of whether PlanningAlerts.com can keep running or not…) as they relied on PlanningAlerts which, in turn, relied on Earnest Marples. You get the picture.

I’m sure there are many more casualties in this but the big question is; who’s at fault? The immediate finger of blame will be pointed at the Royal Mail, being the big bad corporation behind this; there is a strong argument that postcode information is public data and, therefore, should be publically available. Earnest Marples was doing the honourable (and daring) thing in doing this; making this data usable by non profit organisations who want to provide a service that is simply not possible with this locked down data model. My personal opinion is that this data SHOULD be open and usable however the reality is that, legally, Royal Mail owns the data and has the right to charge for it and, yes, what Earnest Marples was doing was technically against the law.

So we’re now back to the question of “Should we put our faith in the clouds?”. If this is anything to go by then relying on cloud based services is a risky business indeed – sure they little to nothing to implement but once the rug gets pulled out, it’s back to the drawing board, having to invest time into fixing any broken links and damage that may have been done to services that have been put in place on the back of this. But, as people expect more of this kind of service on the web, maybe the big corporations who own this kind of data need to think long and hard about their “business model”; being seen as the bad guy is not good for your corporate image…

Here’s a handy tool for y’all. WordPress. It’s probably one of the most common CMSs (Content Management Systems) in existence. It’s written in PHP and the MySQL dialect of SQL, two languages that I do not intend to cover in this course.  The beauty of WordPress, as opposed to systems like Ruby on Rails, Joomla or Django, is that you can do a lot of stuff without having to touch the PHP/SQL stuff. I might argue that the beauty of Django or Rails is that it makes the code so simple that you don’t mind messing with it. But that is definitely digressing. You might want to give those frameworks a look if you are going further later on.

The distinction with all these systems, the thing that makes them different from the javascript-based code we’ve been developing so far, is that javascript runs (typically) in the browser, on the computer of the user who visits your page. PHP and SQL though are executed on a the server. This is why UTS pays Dreamhost money for the usage of their machines.

But one step at a time. WordPress is a great way of seeing how all this website stuff works… let’s take it from where we left off last time, installing stuff from the dreamhost control panel.

The dreamhost add-new-software screen

Shazam. You now have wordpress installed. Why not take a look at what you have there, and fill out your info?

your brand new blog thingy - don't get the email wrong or you'll have to start again.

Once you’ve logged in you’ll be presented with a classic blog dashboard where you can hang around editing posts and so forth. There’s a million options here which might be confusing. Fortunately there is an extensive manual. Why not try to make a brand new post? Can you work out how to do that? Having edited your new post, why not find the post in a browser and have a look the published version? Now, run firebug, or press “view source” and have a look at the HTML that makes up the page… It’s a bit more complex that the stuff we were coding up by hand earlier, no?

where all the wordpress action is at

How is this magic accomplished? Well, if you’d like you can look deeper into the internals of the software… you can point Cyberduck at the server and have a look at the files that make up your wordpress installation. There’s a lot of stuff there- basically, a crapload of PHP code that automates the process of generating HTML for you. You could edit the PHP code in turn if you wanted to… but why bother? Life is short, and there are some easier options to try first.

FTP view of the php files that dreamhost has installed for you to make wordpress go

For a start, you can modify wordpress’s behaviour with plugins, little bits of PHP code that the community has generously written and shared. How about we look for ones that give the blog handy map mashup functionality? I happen to know one of the geo mashup standards is called “GeoRSS”, so I’ll do search for that. Plugins are variable in quality, but the first one listed there looks alright:

i search for georss, i find too many options.

From there it’s as simple as pressing the “install” button. Well, almost. this one uses google maps, so you have to sign on to google maps too:

signing on for a google maps API key is typical of the sorts of sign on you have to do to use third party services.

After those steps, BAM, you now have a mapping-enabled blog:

cripes, a whole new bonus settings menu has appeared.

Great. But you can also change the appearance of your blog. The visual equivalent of a plugin is a “theme”, a collection of CSS and code that changes the appearance of your blog. There are loads of community-contributed ones there too.

you can hunt "themes" the same way as hunting plugins

Of if you need to make finer changes, you can edit the CSS, or the code, that makes up your site by yourself:

The theme editor allows you to get at the CSS and HTML that makes up the site

Now, how about taking it further?

There are loads of interesting plugins – say if you want to integrate some other social networking sites that you are involved in, you could install  Lifestream

If you think giving your readers the ability to comment on the individual paragraphs of your blog, for example, there are plugins to enable that. There is an old system called comment press that makes an interesting case about why you might want to do that. Don’t install that, though, install the new version called digress.it.

Or if you wanted to use wordpress as a mashup engine, lots of things you might want to do don’t even need you to install plugins. For example, you could use the wordpress sidebar widgets to download and install new content from other sites (or from yahoo pipes, or from dapper) using rss… anyone care to walk us through that one?

And if you want to combine some of the other skills we’ve been learning with this… yes, jQuery, and CSS and all that stuff still work. jQuery ships with wordpress and it’s easy to enable. You can create scripts on a per-page basis or for every page in your site. You can also use the google-hosted version, as we’ve been doing in class. There’s a little trick, though – to enable the $() business to work like you’re used to, you have to write your javascript files like this:

jQuery(document).ready(function($) {
    // $() will work as an alias for jQuery() inside of this function
});

There are some excellent tutorials out there on precisely this:

• 30 Tutorials Combining Both WordPress and jQuery
• 15+ Plugins to Unleash the Invincible Power of jQuery and WordPress

Below is a list of some free and open source GIS tools I regularly use:

Something I’m playing with quite a bit at the moment is mapped data. A year ago we launced a system on our website to allow people to report instances of lost and found pets. Thinking about how we could add value to this service I decided to add an RSS feed and try to get some kind of map on the site to show the locations that the animals were lost/found in. The RSS was easy enough to generate (pagescraping in Yahoo! Pipes) but the map required a little more jiggery-pokery.

To get the location, I added a field to the form which requested the user to input a UK postcode. Again with Pipes, I fed this postcode data through the location generator which split out the relevant location, long and lat values. I extracted the long and lat values into geo:long and geo:lat variables respectively. These are the standard names for GeoRSS long and lat values.

The resulting RSS feed was now fully geocoded; the proof was dropping it into Google Maps and watching the points on the map correspond to the postcodes from the webpage. Test it yourself at these links:

The original pipe: http://is.gd/u4J9
The corresponding GeoRSS feed: http://is.gd/u591
The Google Map: http://is.gd/u59j

Google Australia has created a flash map of the fires currently devastating southeast Australia, with fire locations and status updates. Green areas are safe; red means fires are still in progress. These are the worst fires in Australia’s history and what’s particularly scary is that they may have been set deliberately. More than 100 are reported to have lost their lives.

Some food for thought: Googler Paula Fox was able to provide the flash map because the Victoria Fire Department supports the open standard RSS. (RSS is a standardized data format for frequently updated information, designed to be read on many kinds of programs.) But to be useful for visualization, fire data needs geographical information; there exist adaptations such as GeoRSS to do this, but the fire department didn’t have any such thing.

From technologist Elias Bizannes:

1) If you output data, output it in some standard structured format (like RSS, KML, etc).
2) If you want that data to be useful for visualisation, include both time and geographic (latitude/longitude information). Otherwise you’re hindering the public’s ability to use it.
3) Let the public use your data. The Google team spent some time to ensure they were not violating anything by using this data. Websites should be clearer about their rights of usage to enable mashers to work without fear
4) Extend the standards. It would have helped a lot of the CFA site extended their RSS with some custom elements (in their own namespace), for the structured data about the fires. Like for example Get the hell out of here.
5) Having all the Fire Department’s using the same standards would have make a world of difference – build the mashup using one method and it can be immediately useful for future uses.

Natural disaster response needs data, and good data sharing protocols. US agencies aren’t always so good at that. During Katrina, it was the volunteer database Katrinalist that helped people find survivor information. But FEMA’s models were not made available in a way that would allow first responders to act quickly. We need to work on that.

http://www.bepsoft.com/index.php?option=com_content&view=article&id=45:mapbuilder&catid=36:environment&Itemid=37

• Browser based mapping client
• Standards compliant, supports the Open Geospatial consortium(OGC) standards
• Renders maps from Web Map Services (WMS), Web Feature Services (WFS), GeoRSS, Google Maps
• Supports editing map features to Transactional Web Feature Services (WFS-T)
• Allows users to build their own maps, then save and share them, using Web Map Context (WMC) and Open Web Services Context

http://www.bepsoft.com/index.php?option=com_content&view=article&id=45:mapbuilder&catid=36:environment&Itemid=37

http://www.bepsoft.com/index.php?option=com_content&view=article&id=45:mapbuilder&catid=36:environment&Itemid=37

Note to myself

What is written here is not optimized and not ensure security

This is what i did for my visitor map georss format xml file.

a sample node of my georss:

usings:

Imports System.Collections
Imports System.Linq
Imports System.Xml.Linq

'we need it for using :<geo:long></geo:long> <geo:lat></geo:lat> 
Imports <xmlns:geo="http://www.w3.org/2003/01/geo/wgs84_pos#">

'where is my xml file
    Public Shared VisitorDataPathURL As String

'class that store some info
    Public Class UserIpInfo

        Public Property IPAddress() As String...End Property
        Public Property Location() As String...End Property
        Public Property Longitude() As Double...End Property
        Public Property Latitude() As Double...End Property
        Public Property Country() As String...End Property
        Public Property City() As String...End Property

'constructors
        Public Sub New(ByVal iPAddress As String, _
                       ByVal location As String, _
                       ByVal cityname As String, _
                       ByVal countryname As String, _
                       ByVal lon As Double, _
                       ByVal lat As Double

...

        End Sub

        Public Sub New()
        End Sub

    End Class

we provide some info from our application and here are methods :

Public Shared Sub DoVisitorWork(ByVal uinfo As UserIpInfo)

'look for city if already exists

            Dim xdoc As XDocument = XDocument.Load(VisitorDataPathURL)
           Dim searched As XElement = (From xel As XElement In xdoc.Descendants.Elements("item") _
                                  Where xel.Element("city").Value.ToString.Trim.ToLowerInvariant _
                                    = uinfo.City.Trim.ToLowerInvariant _
                                     Select xel).FirstOrDefault

'if city is new , new xelement creating by vb.net xml literal
            If searched Is Nothing Then
                searched = _
                <item>
                    <title><%= uinfo.Location %></title>
                    <description><%= uinfo.Location %></description>
                    <city><%= uinfo.City %></city>
                    <country><%= uinfo.Country %></country>
                    <geo:long><%= uinfo.Longitude %></geo:long>
                    <geo:lat><%= uinfo.Latitude %></geo:lat>
                    <visitorcount>1</visitorcount>
                </item>

                'Dim myxml As String = "<item>" & System.Environment.NewLine & _
                '"<title><%= uinfo.Location %></title>" & System.Environment.NewLine _
        '    & " <description>" & uinfo.Location & "</description>" & System.Environment.NewLine _
                '    & "<city>" & uinfo.City & "</city>" & System.Environment.NewLine _
                '    & "<country>" & uinfo.Country & "</country>" & System.Environment.NewLine _
             '    & "<geo:long>" & uinfo.Longitude & "</geo:long>" & System.Environment.NewLine _
                '    & "<geo:lat>" & uinfo.Latitude & "</geo:lat>" & System.Environment.NewLine _
                '    & "<visitorcount>1</visitorcount></item>"
                'searched = XElement.Parse(myxml)

                'searched = New XElement("item")
                'searched.Add(New XElement("title", uinfo.Location))
                'searched.Add(New XElement("description", uinfo.Location))
                'searched.Add(New XElement("city", uinfo.Location))
                'searched.Add(New XElement("country", uinfo.Location))
                'searched.Add(New XElement("geo:long", uinfo.Longitude))
                'searched.Add(New XElement("geo:lat", uinfo.Latitude))
                'searched.Add(New XElement("visitorcount", 1))

              

                xdoc.Element("rss").Element("channel").Add(searched)
            Else

                searched.Element("visitorcount").Value = _
                (CType(searched.Element("visitorcount").Value.Trim _
                                                          , Int64) + 1).ToString
        searched.Element("description").Value = searched.Element("visitorcount").Value & " Visits"
            End If

            xdoc.Save(VisitorDataPathURL)
    End Sub

show records on gridview,return value can be diffrent than ilist

  Public Shared Function GetVisitorList() As IList

        Dim MyList = (From ui As XElement _
                      In XDocument.Load(VisitorDataPathURL).Descendants.Elements("item") _
                       Order By ui.Element("country").Value _
                      Select Place = ui.Element("title").Value _
                        , City = ui.Element("city").Value _
                        , Country = ui.Element("country").Value _
                        , Count = CInt(ui.Element("visitorcount").Value)).ToList

'got visitorcount property, will be shown in footer of gridview
        VisitorCount = MyList.Select(Function(count) count.Count).Sum

        Return MyList
    End Function

    Public Shared Property VisitorCount() As Integer...End Property

All this stuff in a class…

In virtual earth show this file with VEDataType.GeoRSS method.  Here is EXAMPLE PAGE

In the future clustured pushpins and rich content pushpin descriptions will be there…

notes to myself

I try to do my own visitors locations application on a BlogEngine.NET base website Inaea*.

It is still in progress and needs long way to go. You can take a look from here.

What i need

• A HTTP Module for tracking visitors

It is just an implementation of what Mad Kristensen explain. Simply for reusing your codes is enough reason of using

http module instead of global asax.

First we need to put our file on App_Code folder and we need to register it to webconfig.

How to register to webconfig : (For iis7 platform logic is same)

<httpModules>

...
            <add name="VisitorLog" type="VisitorLog"/>

...
</httpModules>

• GeoIP C# API and GeoLite City (bin format)

I am using their GeoLite City bin format database. Mostly going good for me, 

I just got some visitors in ocean and North Pole  

How to use :

//make a call to hostip handler to get ip info LookupService ls = new LookupService (context.Server.MapPath("mydatalocation"), LookupService.GEOIP_STANDARD); //get city location of the ip address Location l = ls.getLocation("visitorIpAddress"); if (l != null) { do my work with => l.city , l.countryCode, l.city, l.countryName, l.longitude, l.latitude } else { //my b plan } }

• Virtual Earth Map

I use GeoRSS format  for data .(VEDataType.GeoRSS) Because of incomplete works, i planned to write details of map codes later times. I need to eliminate spiders, session handles needs some work, better gridview for show data etc… But as i said before it is just a test and still in progress.

a sample node of georss:

*InAEA

InAEA—International Art Education Association is an online group located in the virtual world of Second Life for all art educators around the world to communicate. InAEA in Second Life not only have a meeting place, but also have a free gallery and avatars for all art educators to use!…

Die Events auf Presentify kann man nicht nur auf Presentify anschauen, sondern auch als RSS-Feeds abonnieren oder weiter verwenden. Wir haben sie heute zu GeoRSS-Feeds upgegradet. Das bedeutet, dass die genaue Location in Längen- und Breitengrad mitübergeben wird. Damit kann man sich die Events direkt auf einer Landkarte anzeigen.

Damit kann man viele lustige Sachen machen, zum Beispiel folgendes:

Events aus Freistadt auf Google Maps

Ein anderes Tool, um diese GeoRSS-Feeds zu verwenden, ist die Mini Map Sidebar für Firefox.

Hace ya más deun año desde la última vez que le dediqué algo de tiempo a laextensión y tenía algunos errores y cosas que quería tocar. Por un ladohace ya algún tiempo salióen las listas de gvSIG el tema del bloqueo activo que Googlerealiza en Cuba cumpliendo las leyes del embargo. Esto fue bastantecriticado y en ese momento, como SEXTANTE, ya meplateé que el servicio era bueno pero no se justificaba si había otrasopciones.

Un compañero de gvSIG me comentó que JavaHispanotenía una forja,así que me puse manos a la obra y efectivamente, aunque con algunosproblemas al principio, pude migrar el código a un nuevoproyecto en la forja de JavaHispano y ahí quedó la cosa.Durante ese tiempo salió OSOR,una forja también de proyectos libres que creo que se queda grande paralo que yo tengo entre manos, aunque me comentaron que si seguía con elproyecto podría usar sus infraestructuras. No creo que cambie, si todova bien, JavaHispano funciona, no muy rápido pero suficiente y tienemucho más de lo que necesito.

En fin, nada que ayer le dediqué unas horas a conseguir que laextensión funcione correctamente sobre gvSIG 1.1.2 (dejo para másadelante la adaptación a gvSIG 2.0) y ya la tenéis disponible en el catálogode extensiones de gvSIG y en la páginade la forja.

Por otro lado he intentado sin éxito integrar la ventana deinformación de geoRSS en la herramienta y el diálogo de gvSIG. La razónprincipal es que me obliga a llevar al ámbito de gvSIG (a su carpeta com.iver.cit.gvsig/lib)partes de la extensión que no deberían estar ahí. Esto es por un temabastante peliagudo y que se está resolviendo. SEXTANTE también losufre, a ver si se soluciona (con un trabajo duro, no sale porgeneración espontánea, creedme que lo sé) y tenemos un gvSIG aún másmodular y extensible.

Otra cosa que he hecho y que me tenía un poco mosqueado desdehace tiempo es el tema de la documentación. Está hecha con DocBook pero noconseguía organizarlo de forma sencilla para que cualquiera pudieracompilarla (aunque dudo mucho que nadie vaya a hacerlo). Finalmente ygracias a un trabajo del equipo de Apache Velocityllamado DocBookFramework, he conseguido que sólo haya que descargar el frameworky si lo pones en el mismo workspace que tuproyecto funciona a la primera ya que tiene todos los componentes. La documentaciónes la misma, pero la forma de montarla es muchísimo más sencilla.

Cosas por mejorar: pues las mismas de antes, mejores javadocs,la documentación técnica del bicho (tampo esto es una obra de laingeniería del software francamente, cualquiera que le pegue un poco agvSIG lo comprenderá fácilmente) y tal vez un poco más de cariñoen las Interfaces de Usuario.

Dejo unas capturas de pantalla: una de la extensiónfuncionando con el RSSinternacional del periódico ElPaís (previo paso por geonames, la extensión se encarga, tusabes) y del geoRSSde las fotos con la etiqueta colorful de flickr (el geoRSS se puede ver abajo del todo de la página, junto alKML) y otras dos con ejemplos de información de una noticia de cadauno, pinchando en la imagen se puede ir a la noticia real. He dereconocer que la sección Internacional del País es para no leerla, quelo más suave que haya encontrado (sin muertos y esas cosas)sea de Sarah Palin…

A Creek

Here’s another entry which may very well not show up.

This is another one that might not be precise enough.

This point should appear on the coast along a well known barrier Island at the place called Nanny Goat Beach

This is a presentation I gave at the second Atlanta barcamp on Saturday, October 18th, 2008. It builds on some of the techniques I described in my TAM6 presentation Building Internet Tools for Skeptics, and shows some new examples.

Instead of a transcript, I’m posting the actual slides. There are notes on many of the slides which the widget below doesn’t show, so you may want to view it on slideshare. Make sure you click the “notes” tab below the slides so you can see them as you proceed. (Or if you prefer, download the original PowerPoint file from there).

Comments welcome.

GeoRSS это еще один пример удачного расширения формата RSS (я уже рассказывал о других удачных расширениях). Этот формат позволяет встраивать информацию о географическом положении объектов, так называемый геокодинг. Многие сервисы уже начинают использовать эту информацию – и как поставщики, например FLickr выставляет данные о месте, где сделана фотография, если таковая имеется, и как потребители, например в Google Maps можно ввести адрес потока rss с геоданными и он их покажет. Или интересный сервис Panaramio, ототого же Гугла, и как поставщик и как потребитель GeoRSS, здесь можно посмотреть фотографии интересных мест (необязательно известных), сделанные самими пользователями.

Ну с теорией достаточно, теперь посмотрим как это можно сделать на своем сайте (конечно с помощью .NET ).

Во-первых, генерация RSS потока с нужными расширенями. Тут ничего нового. Как я описывал уже, с помощью SyndicationFeed и LINQ for XML это очень просто. Есть и готовые обертки для генерации GeoRSS данных.

Во-вторых, нам надо показывать эти данные у себя на сайте. Мне известны два популрных картограцических сервисов с API для встраивания карт у себя – Google Maps от Гугл и Virtual Earth от Майкрософт. Оба сервиса имеют функциональность показа GeoRSS потоков. Как не удивительно, но у Майкрософт с этим удобнее и больше контроля над покащываемыми данными.

На Google Maps достаточно добавить специальный слой и всё.

// The GGeoXml constructor takes a URL pointing to a KML or GeoRSS file.

// You add the GGeoXml object to the map as an overlay, and remove it as an overlay as well.

// The Maps API determines implicitly whether the file is a KML or GeoRSS file.

function initialize()

{  if (GBrowserIsCompatible())

  {    map = new GMap2(document.getElementById("map_canvas"));

    geoXml = new GGeoXml(http://mapgadgets.googlepages.com/cta.kml);

    map.addControl(new GLargeMapControl());

    map.addOverlay(geoXml);  }} 

Но под “всё” имеено всё и заканчивается. Больше никакой информации мы не имеем, ни количество объектов, ни их расположение, ничего. Какие-то свойства мы может контролировать в самом RSS потоке, как цвета, иконки и т.д. Но если, например, мы используем внешний фид, с третего сайта – этого ничего нам недоступно.

На Virtual Earth мы также можем добавить специальный слой на карту

var veLayerSpec = new VELayerSpecification();
veLayerSpec.Type = VELayerType.GeoRSS;
veLayerSpec.ID = 'Hazards';
veLayerSpec.LayerSource = 'http://localhost/hazards/hazards.xml';
veLayerSpec.Method = 'get';
veLayerSpec.IconUrl = 'hazard.gif';
map.AddLayer(veLayerSpec);

или импортировать объекты из GeoRSS потока в существующий слой

var slGeoRSS= new VEShapeLayer();

var veLayerSpec = new VEShapeSourceSpecification(VEDataType.GeoRSS, url, slGeoRSS);
map.ImportShapeLayerData(veLayerSpec, null, false);

При этом у нас имеются события при ипорте, где мы можем получить доступ ко все объектам из RSS и поменять их, как нам захочется.

Еще смежной, но отдельной темой, с которой я столкнулся при работе над проектами моих заказчиков – это хранение и показ собственных географических данных на картах. В предыдущих примерах имелось ввиду что геоданные у нас имеются, причем в нужном формате для GeoRSS. Так вот, чтобы они действительно имелись, очень удобно оказалось использовать новый тип географических данных в Microsoft SQL Server 2008. Так называемый Spatial data type, куда входит geometry тип и geography тип. Но об этом как-нибудь в другой раз.

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