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NASA's Interactive Flood Maps

MathiasRav Wrong algorithm (90 comments)

The map is wildly inaccurate. Look at this gravel pit near Petersburg, VA: Because the pit is close to sea level, the map claims it will be flooded at a 2 m sea level rise. In reality, it would probably take a 60 m sea level rise for it to flood because of the height of the surrounding terrain.

It looks like NASA just did a plane intersection with the terrain. If the height above sea level at this point is lower than a threshold, then they claim it will be flooded when the sea rises to this threshold. This is the reason why the Netherlands seems to be all flooded on the map - dams are completely ignored by this algorithm.

Look at a sea level rise map of the same gravel pit in a calculation that takes the global terrain into account. You need to set the water level to 60 m for the sea to spill over into the gravel pit.

more than 2 years ago
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SEC Filing Reveals Details of Zynga's Relationship With Facebook

MathiasRav Facebook and Zynga? (53 comments)

In a relationship and it's complicated.

more than 3 years ago
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Ask Slashdot: Linux Support In Universities?

MathiasRav Re:Opposite problem: Information overload (432 comments)

With wpa_supplicant, eduroam is the easiest to connect to. On Windows I haven't been able to connect to eduroam. In this way, I think the eduroam people actually give preference to wpa_supplicant users (Android, Linux and others).

more than 3 years ago
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Can You Beat a Computer At Rock-Paper-Scissors?

MathiasRav Paper Rules (292 comments)

For an intro (and I mean intro) course in Computer Science at uni, we were assigned to write a Java client in a game called Paper Rules. Establish TCP connection, wait for the master server to find an opponent (another client) for you, and then repeatedly send either ROCK, PAPER or SCISSORS to the server and read the result of the match. To make it interesting, the rules were enhanced so winning a round yielded 1 point, losing -1 point, except when paper won, in which case 2 points were assigned to the winner and -2 to the loser. Our task was to write an "AI" to outsmart the other students' AI.

I wrote a simple algorithm that kept track of the statistics for each of the 18 combinations of [my choice in round n, round n result, opponent's choice in round n+1] and chose based on what the opponent had picked the most in the past. In a match, the winner was declared after 1000 rounds.

Of course, the so-called PaperServer was a <1000-SLOC inefficient by-students-for-students Java one-system-thread-per-connection server running in a Java VM inside a Java VM (yes, really - an IDE called BlueJ) on a terribly underpowered virtual server, so it didn't last long, and anything educational was lost on us that day. Fun times.

more than 3 years ago
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Swinging Robot Excels At Wall-Climbing

MathiasRav Re:Roboticus Superioritis (54 comments)

I no longer login because I feel that while attacking a company's products is fair game (specifically Apple), having stories singling out their users as "selfish" and unkind is not "news for nerds stuff that matters". Am I an Apple fanboi? Let's just say I've used NIX for decades (yes I'm old) and I'm not talking OS X.

You know, registered users can have signatures.

more than 4 years ago
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Tracking the Harm Games Do

MathiasRav Pacman (118 comments)

If Pacman had affected us as kids we'd be running around in dark rooms, munching magic pills and listening to repetitive music.

more than 4 years ago
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Google Engineer Decries Complexity of Java, C++

MathiasRav Re:Emperor is Naked (878 comments)

We need a new OS too. There hasn't been a decent OS since CP/M.

There's Emacs.

more than 4 years ago
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Open Source OCR That Makes Searchable PDFs

MathiasRav Re:Unsuccessful download? (133 comments)

Did you try wget? See what error it reports, or try with wget --continue (shorthand -c).

more than 4 years ago
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Obama Awards Nearly $2 Billion For Solar Power

MathiasRav Re:In other news (514 comments)

Bill Gates doesn't care about US corporate IP rights anymore, he cares about his legacy as a philanthropist.

more than 4 years ago
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Cory Doctorow On For the Win, Gold Farming, and DRM

MathiasRav Re:Having actually READ the novel (179 comments)

Being halfway through the novel now, thanks for not spoiling the ending.

more than 4 years ago
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Secure Communication Comes To Android

MathiasRav Useless (150 comments)

Encrypted voice is US only, so that's no good for the rest of the world. Also, searching for TextSecure on Market doesn't yield any results on my Android 1.5 device (although the FAQ claims it works on all versions of Android), though 2.2 is fine. Sending encrypted texts to myself didn't work either, it says "Bad encrypted message..." but that might just be me doing something wrong.

more than 4 years ago
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Why Overheard Cell Phone Chats Are Annoying

MathiasRav Re:what a waste of research (344 comments)

So you don't mind hearing 1/3rd of the conversation? Fascinating.

FTFY (1/2 of the conversation is 3/2 of what he's interested in)

more than 4 years ago
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Creating a Better Facebook

MathiasRav Re:Dirty Unix Joke (295 comments)

But... you can't fsck when the drive is mounted! That's all wrong!

more than 4 years ago
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Mozilla Reveals Firefox 4 Plans

MathiasRav Re:Please, please, (570 comments)

The bookmarks I need the most, I put on the bookmarks bar. The bookmarks I don't need as often, I name and access from the address bar (Enter title of bookmark, pick from suggestions), and to back up my bookmarks, it's Ctrl+shift+B, Tools -> Export Bookmarks. All I've ever needed.

more than 4 years ago

Submissions

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Neighbors to Submit DNA to Avoid Murder Suspicion

MathiasRav MathiasRav writes  |  more than 4 years ago

MathiasRav (1210872) writes "On January 1, Maria Møller Christensen was killed in the laundry room of her apartment block in Herning, Denmark (Google translation, Danish original). Since the DNA profile of the killer does not yield a match in the Danish police database, the local PD is requesting the neighbors who had access to the laundry at the time to voluntarily submit a DNA test (original) in order to avoid further suspicion in the case. According to the police officials in Herning, rejecting this offer will not raise suspicion, and the police cannot force the residents to submit a DNA profile for any reason, due to Danish legislation similar to the fourth amendment to the US constitution. The request follows the release of the 48 year old Jan Lindholt Mikkelsen, who was taken into custody for 18 days (original) on suspicion of the murder. Technical evidence led to the release."
Link to Original Source

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