HealthMap & data fusion: detailed Google Tech Talks intro

The Google Tech Talks channel on YouTube slowly but irresistibly became my private university in current tech trends. Here is a recent talk on the amazing HealthMap by its developers John Brownstein, Clark Freifeld, Mikaela Keller. According to the about page:

HealthMap brings together disparate data sources to achieve a unified and comprehensive view of the current global state of infectious diseases and their effect on human and animal health.

HealthMap is a Linux/Apache/MySQL/PHP application and relies on the following open products: Google Maps,GoogleMapAPI for PHP, xajax PHP AJAX library, Open Source Web Design

3 thoughts on “HealthMap & data fusion: detailed Google Tech Talks intro

  1. Soft-updates is an alternative to this scheme where the filesystem keeps a list of dependencies that must be satisfied before a change to the filesystem can be visible on disk. For example, you wouldn’t want to write a directory entry pointing at an inode until the inode was initialized on disk and marked allocated. Softdep handles this by rolling back changes to metadata that don’t yet have their dependencies satisfied when we try to write a block. In this way we can commit any completed ‘transactions’ while keeping the disk state consistent. Softdep also allows these dependencies to discover operations which cancel each other out and thus nothing makes it to disk. For example, let’s say you create a temporary file and then remove it after writing some blocks, which compilers often do, if it all happens within the interval of the syncer nothing will make it to disk.

Comments are closed.