Skip to main content

Today I Learned: RBN mishaps; Google Earth URLs; Google Earth Studio

 How many apparent callsigns can one little ham radio bear? Google Earth on the web has a URL API of sorts, but apparently NO animation! Grrr.....


Google Earth's URL stores the initial view of the map like so

https://earth.google.com/web/@37.78472548,-122.50134987,111.08460648a,1238.99361831d,35y,-168.52095559h,74.50108975t,0r

It may come in hand for doing something involving GUI screen scraping and unit testing in future projects with the Rockmite ham radio.

There's a new callsign in town for the little KD0FNR Rockmite. It's KD0R. So far, I have no  idea how this alias is coming about.

Google Earth (at least on the web) doesn't support animation at the moment as far as I can tell. (Sigh, I'm stuck in kepler.gl for that feature for the moment.) Google Earth Studio will apparently support animation though? I hope to find out. For reference, kepler.gl is a nice platform, but I'm more used to working with kml files from back in the day when I had apps tracking planes


 and satellites. (I miss you Google Earth plugin!)


24 hours of a satellite path where every vertical yellow line is another two minutes along the satellite path.


Comments

Popular posts from this blog

Cool Math Tricks: Deriving the Divergence, (Del or Nabla) into New (Cylindrical) Coordinate Systems

Now available as a Kindle ebook for 99 cents ! Get a spiffy ebook, and fund more physics The following is a pretty lengthy procedure, but converting the divergence, (nabla, del) operator between coordinate systems comes up pretty often. While there are tables for converting between common coordinate systems , there seem to be fewer explanations of the procedure for deriving the conversion, so here goes! What do we actually want? To convert the Cartesian nabla to the nabla for another coordinate system, say… cylindrical coordinates. What we’ll need: 1. The Cartesian Nabla: 2. A set of equations relating the Cartesian coordinates to cylindrical coordinates: 3. A set of equations relating the Cartesian basis vectors to the basis vectors of the new coordinate system: How to do it: Use the chain rule for differentiation to convert the derivatives with respect to the Cartesian variables to derivatives with respect to the cylindrical variables. The chain ...

The Alcubierre Warp Drive Tophat Function and Open Science with Sage

I transferred yesterday's Mathematica file with the Alcubierre warp drive[2] line element and space curvature calculations to the  +Sage Mathematical Software System  today, (the files been  added to the public repository [3]).  If you haven't used Sage before, it's a Python based software package that's similar in functionality to Mathematica.  Oh, and it' free.  I also worked a little more on understanding the theory, but frankly, I made far more progress with the software than the theory.  What follows will be a little more of the Alcubierre theory, plus, a cool Sage interactive demo of one of the Alcubierre functions[1], as well as a bit about my first experience with using Sage. Theory The theory is fun, but it's moving slowly.  Here's the chalk board from this morning's discussion Alcubierre setup the derivation using something called the 3+1 formalism which means we consider space to be flat, (in this case), slices that are labelled ...

The Valentine's Day Magnetic Monopole

There's an assymetry to the form of the two Maxwell's equations shown in picture 1.  While the divergence of the electric field is proportional to the electric charge density at a given point, the divergence of the magnetic field is equal to zero.  This is typically explained in the following way.  While we know that electrons, the fundamental electric charge carriers exist, evidence seems to indicate that magnetic monopoles, the particles that would carry magnetic 'charge', either don't exist, or, the energies required to create them are so high that they are exceedingly rare.  That doesn't stop us from looking for them though! Keeping with the theme of Fairbank[1] and his academic progeny over the semester break, today's post is about the discovery of a magnetic monopole candidate event by one of the Fairbank's graduate students, Blas Cabrera[2].  Cabrera was utilizing a loop type of magnetic monopole detector.  Its operation is in...