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: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Tom Russo Sent: Wednesday, November 28, 2007 10:36 AM To: Curt, WE7U Cc: Xastir@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 <[EMAIL PROTECTED]> 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. -- Tom Russo KM5VY SAR502 DM64ux http://www.swcp.com/~russo/ Tijeras, NM QRPL#1592 K2#398 SOC#236 AHTB#1 http://kevan.org/brain.cgi?DDTNM "And, isn't sanity really just a one-trick pony anyway? I mean all you get is one trick, rational thinking, but when you're good and crazy, oooh, oooh, oooh, the sky is the limit!" --- The Tick _______________________________________________ Xastir mailing list Xastir@xastir.org http://lists.xastir.org/cgi-bin/mailman/listinfo/xastir _______________________________________________ Xastir mailing list Xastir@xastir.org http://lists.xastir.org/cgi-bin/mailman/listinfo/xastir
