[Xastir] Wx Alerts

[Lynn W. Deffenbaugh (Mr)]

Here's my internal diagnostics along with the raw packet from aprs.fi:

MSOFFW>APRS,qAO,AE5PL-WX:;MSOFFWKYA*180300z4823.10NF11533.90Ww 
FLASH_FLOOD }j0INHJNPTRNNH{HKYAA

WinMain:2011-01-18T03:04:09.567 MSOFFW->MSOFFWKYA MultiLine( FLASH_FLOOD 
}j0INHJNPTRNNH{HKYAA)
WinMain:2011-01-18T03:04:09.567 LineType(j) ObjType(0) 
Scale(I(73))=0.010000 at 4823.10N 11533.90W
WinMain:2011-01-18T03:04:09.567 o[0]=0 -6 or 0.000000 -0.060000 or 
4823.10N 11530.30W
WinMain:2011-01-18T03:04:09.567 o[1]=-4 0 or -0.040000 0.000000 or 
4820.70N 11533.90W
WinMain:2011-01-18T03:04:09.567 o[2]=2 6 or 0.020000 0.060000 or 
4824.30N 11537.50W
WinMain:2011-01-18T03:04:09.567 o[3]=4 0 or 0.040000 0.000000 or 
4825.50N 11533.90W
WinMain:2011-01-18T03:04:09.567 o[4]=0 -6 or 0.000000 -0.060000 or 
4823.10N 11530.30W

So, the object starts at 48 23.10N 115 33.90W
Line type 'j' (Green Solid)
Object type '0' (Closed Polygon) Interestingly the points close the 
polygon anyway and I gather it's NOT supposed to be filled?
Scale 'I' or 73 which is 0.01 units per increment

NH = 78/72 or 0/-6 increments which I thought was 48 23.10N 115 30.30W 
which is indeed EAST of the start because of the negative?
JN =  74/78 or -4/0 or 48 20.70N 115 33.90W (Negative N/S is south, zero 
E/W offset)
PT = 80/84 or 2/6 or 48 24.30N 115 37.50W (Now North of the start, and 6 
puts us further WEST of the start?)
RN = 82/78 or 4/0 or 48 25.50N 115 33.90W (Still North of the start, but 
zero E/W offset)
NH = Same as first

So, the N/S offsets are supposed to be E/W in-line with the object 
itself (2nd and 4th points).  Both images agree with that.

The first point is N/S in-line and EAST of the object...Yep, my debug 
has the right value, but my plotting is worng.  Copy/Paste error between 
the debug and the actual point calculation!

The third point is supposed to be NW of the object, but mine is NE on 
the plot even though my debug has the right coordinates.  Funny how a 
little +/- swap will do that to an image!

Thanks for the screen cap of what it should be Tom!  And for the bandwidth!

Lynn (D) - KJ4ERJ - Author of APRSISCE for Windows Mobile and Win32

Tom Russo wrote:
> On Mon, Jan 17, 2011 at 09:46:48PM -0500, we recorded a bogon-computron collision of the <ldeffenb at homeside.to> flavor, containing:
>   
>> I don't know if this will come through, but is this what the MSOFFWKYA
>> flood warning should look like?
>>
>> http://tinyurl.com/MSOFFWKYQ
>>     
>
> Looks like you might have a sign error in decoding.  When I view the
> object in Xastir, it looks almost like a mirror image of what you show there.
>
> Take a look at http://www.swcp.com/~russo/imgs/MSOFFWKYA.png for what
> it looks like here.
>
>   
>> Curt, WE7U wrote:
>>     
>>> It sounds like yourself, Gerry, Alex, and I are all interested in 
>>> doing something about this.  Perhaps Tom and Lynn as well.  We happen 
>>> to have flood alerts happening in my county right now.
>>>       
>
>