[time-nuts] Lady Heather's Fat Client

Bruce Griffiths bruce.griffiths at xtra.co.nz
Thu Dec 10 02:00:43 UTC 2009


More accurately (pun intended) the GPS receiver first calculates the 
height above the ellipsoid that approximates the earth's surface and 
then uses a geoid separation table to calculate the height above MSL.
Due to storage constraints the geoid separation table may necessarily be 
inaccurate.

Bruce

John Miles wrote:
> That graphics library is 95% post-consumer fiber at this point. :(  It's
> good for rapid development and porting work but as you can tell it's pretty
> rough around the edges.
>
> Every time I run a survey on a Thunderbolt here, it seems to want to find
> itself at the bottom of the lake.  Bruce pointed out in an email that what
> GPS considers "altitude" isn't necessarily the same as what terrestrial
> mapmakers mark as sea level, so maybe that's what's happening.
>
> -- john
>
>    
>> -----Original Message-----
>> From: Mike Naruta AA8K [mailto:aa8k at comcast.net]
>> Sent: Wednesday, December 09, 2009 4:12 PM
>> To: John Miles; time-nuts at febo.com
>> Subject: Re: [time-nuts] Lady Heather's Fat Client
>>
>>
>>
>> Oh, I thought it was my PC.
>> Neat John, we like recycled code.
>>
>> The KE5FX remote access is fun too, works well.
>>
>> I'm surprised that your antenna receives so well,
>> being at -7.6 m.  Doesn't it get wet?
>>
>>
>> (I know; I'm just trying to be funny)
>>
>>
>> Mike - AA8K
>>
>>
>>
>> John Miles wrote:
>>      
>>> Hi, Mike --
>>>
>>> Correct, that's not a bug, and it won't change unless/until the
>>>        
>> program is
>>      
>>> rewritten with a new graphics library.
>>>
>>> In fullscreen mode there's no window border, so the 1024x768
>>>        
>> display surface
>>      
>>> can accommodate the 1024x768 client area.  When you hit F11 to
>>>        
>> go back to
>>      
>>> windowed mode on a machine with a 1024x768 desktop, there's no
>>>        
>> room for the
>>      
>>> window border and caption bar that surrounds the client area, so the
>>> graphics system has to downsample the client area to fit.
>>>
>>> Back when the graphics library was written, in an era when 33
>>>        
>> MHz processors
>>      
>>> were still common, it was much faster to downsample by factors
>>>        
>> of two than
>>      
>>> to incrementally shrink the image to fit.  So you will always
>>>        
>> get the tiny,
>>      
>>> cramped display window in cases where you request a resolution in window
>>> mode that can't fit on the desktop.
>>>
>>> -- john, KE5FX
>>>
>>>        
>>      
>
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