This is a simple JavaScript calculator for figuring out world files.
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Here is all of 2008 in infrared from NOAA’s eastern GOES satellite. This was the wettest year on record here in the mid-Mississippi valley, and the 2008 Atlantic hurricane season was a fairly busy one.
Note that the images used here do not show clouds per se — it is infrared sensing. That generally correlates to cloud cover, but it’s not identical. There are often low clouds when this image would make you think the sky is clear. High clouds and thick clouds with high tops — the weather makers — are what these images show most clearly. And those are the interesting ones, of course.
The whorl and play of weather systems sweeping across the continent is always fascinating. In certain seasons you can see sea breeze convergence creating diurnal pulses of cumulus clouds over Florida and the Greater Antilles. The rain shadow of mountain ranges is evident.
A video with sound is superior to one without, whether it’s music that fits the mood, or background sound that fits the subject, such as wind or storm noise for a weather-related video. But a series of still images that make up a time-lapse animation does not come with any sound. Here are a couple of sources for sounds that are licensed under a variety of mashup-friendly licenses. Read the rest of this entry »
Long story – short
To project the individual frames for this video I used:
gdalwarp -tr 10000 10000 -s_srs EPSG:4326 -t_srs EPSG:2163 nation.gif nationproj.tif
Long story – long
I finally figured out some of the mojo necessary to get some good out of gdalwarp. For me the key was to understand the “spatial reference system” (SRS) parameters. Key to understanding that was grokking the “+proj” notation used in the proj program.
So I got around to converting this little site from hand-coded HTML into a CMS-managed blog. This should make it much easier to add to from time to time. See the about page if you’re inexplicably curious about the idea here.
Channel EGB13
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