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Yearly Archives: 2009

Exploring Geographic Parameter Space With A Gis Implementation Of Cellular Automata

by: Vivienne Cole & Jochen Albrecht

Many of the recent studies of vegetation spread and the invasion of introduced species incorporate GIS and some form of dynamic modelling in one- or two-dimensional space. Most work, however, concentrates on presenting a predetermined model in an abstract computer simulation environment. The focus has been on the system’s ability to display the model (results), as opposed to its ability to develop or compose a model, acting as a creative tool in an applied situation. The research presented in this paper uses a GIS-based cellular automata (CA) framework to study and create an applied and ecologically significant model of spread for the invasive plant species Rhamnus alaternus. (more…)

Developing State-enabled Applications With PHP

by: John L

Installment 1

Developing State-enabled Applications With PHP

When a user is browsing through a website and is surfing from one web page to another, sometimes the website needs to remember the actions (e.g. choices) performed by the user. For example, in a website that sells DVDs, the user typically browses through a list of DVDs and selects individual DVDs for check out at the end of the shopping session. The website needs to remember which DVDs the user has selected because the selected items needs to be presented again to the user when the user checks out. In other words, the website needs to remember the State – i.e. the selected items – of the user’s browsing activities. (more…)

For Automated Sites PHP and MySQL are A Perfect Match

by: Halstatt Pires

You’ve decided to automate your web site. Now what? Here are some ideas to help you choose how to automate your site.

A bit of programming is going to be necessary if you want to automate a site. There are many types of programs that can be used to automate a web site including JavaScript, PHP, Perl, ASP, Java and more. So, which do you use? For many, it is a personal choice.

I prefer PHP for programming. PHP is a particularly useful programming language because it allows for advanced programming and is easy to integrate with web pages. Another plus of PHP is that the language interfaces very well with MySQL, a popular type of online database. (more…)