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Re: How do I compute the longitude and latitude of a point at a certain distance?

by I0 (Priest)
on Apr 22, 2003 at 08:37 UTC ( #252219=note: print w/replies, xml ) Need Help??


in reply to How do I compute the longitude and latitude of a point at a certain distance?

($latitude,$longitude)=ll( MILES=>5, LATITUDE=>51+29/60, LONGITUDE=>0+0/60, DIRECTION=>315, ); if( $latitude < 0 ){ $latitude *= -1; $ns='S'; }else{ $ns='N'; } if( $longitude < 0 ){ $longitude *= -1; $ew='W'; }else{ $ew='E'; } print int $latitude,"",60*($latitude-int $latitude),"' $ns\n", int $longitude,"",60*($longitude-int $longitude),"' $ew\n"; use Math::Trig; sub ll{ my %l=@_; use constant PI=>4*atan2(1,1); my $nm = $l{MILES}*.87; my $A=$l{DIRECTION}*PI/180; my $b=(90-$l{LATITUDE})*PI/180; my $c=$nm/60/180*PI; my $a=acos(cos($b)*cos($c)+sin($b)*sin($c)*cos($A)); my $latitude=90-180/PI*$a; my $C=asin(sin($c)*sin($A)/sin($a)); my $longitude=$l{LONGITUDE}+180/PI*$C; return $latitude,$longitude; }
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[stevieb]: shmem thanks for the 'insight' :P
[shmem]: good thing that Sun already took "OpenWindows", otherwise I'd not stop to shudder imagining an "OpenWindows" from MS
[shmem]: more garbage in, more garbage out that would be
[stevieb]: I found that win10 broke a C# library I was using for one project while enhancing tests for a Perl dist, which breaks other Perl dists, and I'm about to throw my hands up on berrybrew. win2k12 broke one thing, win10 breaks something...
[stevieb]: ...unrelated which requires replacing a lot of code and a whole lib. I'm about to go nix only ffs
[shmem]: stevieb: what you're doing sounds afwully complex. Too much for me this evening to provide brighter insight ;-)
[stevieb]: I don't even own a Windows computer. Both my girl and I have a laptop each with Linux. I'm supporting Windows in some of my projects and I can't even guage whether it's worth it or not.
[stevieb]: shmem It's something I desired to have years ago, which is why I took over berrybrew. Cross-platform build/test automation locally, or over the network Test::BrewBuild
[shmem]: sounds good.
[shmem]: but I'm crumbling smaller stones. remember...

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