Category Archives: Link of the Day

Butterfly Gardening

In the last couple of days, we’ve seen an explosion of butterflies (well, I mean a lot of butterflies, not actually exploding butterflies) around the neighborhood. If you like butterflies, perhaps you could use the University of Minnesota Extension Service’s guide on Butterfly Gardening, converting your garden into an attractive locale for the insects that don’t elicit an “ew!” response.

Five reasons social networking doesn’t work – CNET.com

Molly Wood has an article on CNET detailing Five reasons social networking doesn’t work. I think it’s worth reading. Her top reason:

There’s nothing to do there.

Amen. The real problem is that once you bother going to a social networking networking website, there is nothing to actually do except email and posting, and we already have perfectly good ways of doing that without them.

It’s also interesting to note how her opinions may differ from those of men. There is a definite undercurrent of sexual harrassment that should not be ignored.

Addendum: I just tried to log into orkut for the first time in months. I suddenly remembered why I stopped using it. Within 30 seconds I got an error message indicating that there server had “done something unexpected”. Uh, yeah. Bite me.

Seamless Data Distribution System

My HouseGoogle Maps is pretty cool, but they watermark all their images which makes their satellite data a little less than entirely useful for goofing around with. That’s why I’m pleased to see the USGS has the Seamless Data Distribution System, which allows you to download high resolution imagery, maps and all sorts of other data. The image on the right is some high resolution imagery of my house. You can see my next door neighbor’s blue van. Cool stuff.

Map Projections: How Projections Work

North AmericaI like maps. I thought I’d archive a couple of useful links for generating your own maps:

  • First, a site to describe how to take latitude and longitude and project them into two dimensions. Contains lots and lots of formulas. Map Projections: How Projections Work
  • Of course, to use those formulas you need some raw data. The CIA World Databank II has such data, and is public domain to boot. The linked site has them in an easy to parse textual format for easy manipulation.

Addendum: the wikipedia has links to these sites, which is how I found them.

Addendum2: I also found this website to be useful. It countains outlines for the continents, which I used to generate this animated gif of the earth’s rotation.

Systm

Another fun link from the make blog: Systm, a video show produced by a couple of young geeks. In their first episode, they build a warspying setup into a modified cashbox and go in search of wireless video cameras. Despite the socially marginal justification, it’s pretty well done and worth a few minutes of bittorrent downloading.

Cool video experiment

Video Thing has a cool experiment in shooting panoramic video using a Christmas tree ball mounted on a boom in front of a DV cam. An After Effects plugin turns the resulting reflection into a cylindrical environment video. Very cool.

I did some experiments a while ago using this setup, only with still images instead of video. My old Kodak 210+ wouldn’t focus close enough to get a good image of the ball, so I turned out this:

cylindrical map

The code was pretty simple to write: just convert from reflected rayspace into a cylindrical map. Cool stuff.

NASA World Wind

I ran across a cool Windows program the other day: NASA World Wind. It’s an application that allows you to view landsat and shuttle radar topography data from any view on earth. What’s doubly cool is that it has high resolution photography of urban centers throughout the US, at considerably beter resolution than the imagery available via Google Maps. For instance, check out this image of Pixar via WorldWind and compare it to this Google Maps view of Pixar. Quite a big difference.

It’s a fairly big download (180 megabytes) but very cool. Try it out.