Thursday, March 3, 2016

Esri Leaflet Dynamic TileLayer Plugin Example

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While working in one my Esri-Leaflet based application, I am stumbled on rendering dynamic map layers on tiled basis. Esri leaflet-api does the perfect job on non-tiled layer display but L.esri.DynamicMapLayer, doesn’t provide the tiled dynamic map layers. Looking around I came across the Tiled dynamic layer plugin for esri-leaflet, for displaying the DynamicMapLayer in tiled mode.

Here I have created both non-tiled and tiled DynamicMapLayer version for comparison using plain esri-leaflet and esri-leaflet with plugin.


Gallery: Animated Dendrograms using D3.js

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Lists of animated dendrograms using D3.js
1) Dendrogram with root to node selected path highlight, zoom and pan
2) Species sunburst
3) Species wheel with zoom pan feature
4) Collapsible dendrogram with root to node selected path highlight plus zoom/pan

How to display HTML5 applications from Github Gist to bl.ocks.org?

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The http://bl.ocks.org is a simple viewer for HTML/CSS/JavaScript code examples hosted on Github Gist, which is built by Mike Bostock. In other words, blocks.org is a tool which will convert the Gist code into the format you see in bl.okcs.org allowing you to view HTML/ CSS / JavaScript applications directly from GitHub/Gist. GitHub is a web based version control and source code repository and Gists are a great way to share your source code among the peers.

Gists could be anything, but in HTML/JavaScript perspective, it could be a beautiful visualization using d3.js, interactive web map using Leaflet or Openlayers or ESRI Javascript API, and web map with WMS layers etc. Gists can share single files, parts of files, or full applications.

If you have built a beautiful visualization using HTML/JavaScript and want to view on blocks.org. 
Here is how to do this.

Wednesday, January 6, 2016

Conference: MidAmerica GIS Symposium (MAGIC) 2016 Symposium

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The 2016 Symposium will be held at the Overland Park, KS Convention Center April 24 - April 28, 2016 in Overland Park, Kansas. The conference hotel, the Overland Park Sheraton is adjacent to the Convention Center.
Why did we chose Overland Park? Overland Park is one of the fastest growing areas in the country. The OP Convention Center is very spacious - offering our Planning Committees ample opportunity to bring you new learning experiences! Additionally, we've listened to your concerns with previous location logistics:
  • Parking: It's free and there is plenty of it!
  • Internet: It's also free EVERYWHERE including the guest rooms, meeting rooms, and Exhibit Hall!
  • The Gym: It's free too!
  • Location: Downtown Kansas City can be intimidating. The Overland Park Convention Center is extremely easy to get to, and is right off a major highway. Additionally, the area is hopping with new entertainment and shopping districts, restaurants and museums!
GIS covers such a broad range of subjects, applications and types of people that use it, that developing a conference program that meets everyone's needs is a challenging task. Even more challenging is an attendee trying to figure out exactly which sessions or topics will be most interesting and helpful. MAGIC 2016 is intended to focus the content of the presentation options into a program specifically geared to each attendee's needs.

Nhibernate criteria API - select from multiple tables

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If you ever worked with relational databases then higher chances are you already worked with sub queries. Some time while working with Nhibernate you get yourself into some situation where you need sub query to do some lifting for you. In NHibernate criteria API you can do the sub query usingDetachedCriteria and Subqueries classes. As the name suggests DetachedCriteria helps you define your sub query criteria while Subqueries class help you create sub query criterion object using detached criteria object.

In order to demonstrate sub query implementation lets consider an example. Suppose we have three entities Order, OrderItem and Product where one order can more have more then one order items while one order item may be linked to a product. If we need to do a query where we need to list all those order items which are linked to products and have price greater then $100. Also the products must be the ones marked as special in system. The SQL for such query may be something like below

SELECT * FROM OrderItem AS OI 
WHERE OI.Price > 100 AND OI.ProductId IN ( SELECT P.ProductId FROM Product WHERE P.IsSpecial = 1 )

Tuesday, December 15, 2015

Conference: FOSS4G North America (FOSS4GNA) 2016, Raleigh, North Carolina

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Dear Everyone,
On behalf of the Organizing Team, we would like to invite you to submit talk & workshop proposals for FOSS4G North America 2016. The conference will run May 2-5, 2016 at the Raleigh Convention Center in Raleigh, North Carolina, U.S.A.. 
Like last year, we will be offering a free full access pass to speakers who have their talk or workshop accepted. The 2016 conference will be noticeably bigger than 2015. The list of topics include a number of mature areas as well as emerging ones. Please see the call for proposals for details and to submit a proposal. 
Also, public community voting on submissions has been enabled. Cast your vote for the presentations and workshops you would like to see! 
We wish you a safe and happy holiday season! 
The FOSS4G NA 2016 Team
 

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