[Xastir] Terraserver problems with map registration

[Richard Polivka, N6NKO]

Yup, I have cycles to burn.....

BigBox is running three monitors across at 1280x1024 each (effective 
3840x1024) as one desktop.

I do have another free video port to add another monitor....

73 from 807,

Richard, N6NKO


Bob Donnell wrote:
> I was discussing this with Curt on IM, and had the thought that once the
> absolute limits are known, that the code performing terraserver requests
> should evaluate the window size xastir's running in, then form a sub-scale
> request appropriately and then upscale the returned image after the fact
> Most of us with high resolution displays wouldn't often notice if the image
> request was scaled to 50% then the returned image was scaled to 200%.  If
> the window is more than 3 times the limit, do it to 1/3 and 3x scaling, etc.
> So the idea is to downscale the requests to something terraserver will
> reliably return all of, and then upscale it on the local PC.  I guess the
> main idea is that by scaling our requests, we control how much complexity is
> involved in rescaling the returned image.  So integer amounts and even
> percentages, like 40%, 50%, 75%, 80%, etc. reduces a lot of the scaling
> tasks to simple integer math.
>
> Besides, anyone running that big a screen must have cycles to burn <grin>
>
> It also occurs to me that this might be a file size limit, vs. a pixel count
> limit, so the returned image size may be related to that - though from their
> end, it'd be a lot easier to code a pixel count limit.  If file size was the
> limit, then the file size could vary due to compression factors and how much
> detail is present.
>
> 73, Bob, KD7NM
>
> -----Original Message-----
> From: xastir-bounces at xastir.org [mailto:xastir-bounces at xastir.org] On Behalf
> Of Tom Russo
> Sent: Wednesday, November 28, 2007 10:36 AM
> To: Curt, WE7U
> Cc: Xastir at xastir.org
> Subject: Re: [Xastir] Terraserver problems with map registration
>
> On Wed, Nov 28, 2007 at 10:31:57AM -0800, we recorded a bogon-computron
> collision of the <archer at eskimo.com> flavor, containing:
>   
>> On Wed, 28 Nov 2007, Curt, WE7U wrote:
>>
>>     
>>> On Wed, 28 Nov 2007, Curt, WE7U wrote:
>>>
>>>       
>>>> At 1410x950 it looks ok.  If I go much bigger in either direction 
>>>> the registration gets knocked out of whack in the E/W direction.
>>>>         
>>> Looks like 1410x992 is the limit.  Go over that by one pixel in 
>>> either direction and it's off.
>>>       
>> Hmmm.  Can go up to 1408x1109 and it's fine too.  Must be larger 
>> vertically before it can go larger horizontally?
>>     
>
> The issue is entirely that the file requested is too large for terraserver
> to agree to serve.  It is likely not a fixed pixel limit, since jpg
> compression probably allows some pizel-wise larger images to be smaller
> byte-wise than others.
>
>