Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 10-06-2012, 20:05   #1
Registered User

Join Date: Jan 2007
Location: Minneapolis
Boat: Irwin 37 CC
Posts: 660
3.0 Possible problem with polyconic charts

I have loaded (only) District 9 charts. A lot, but not all, are polyconic. The attached file, Screen 1, shows us zoomed in on Grand Marais MN. If I stay at this level of zoom I can pan around with no problems. If I zoom in one more level, the bottom of the screen disappears, as seen in screen 2. The second mercator chart, shown in the chart bar, has a scale of 60000, the second polyconic 120000.

I have opengl turned on. It seems to do a much better job of rendering, especially when panning,
Attached Thumbnails
Click image for larger version

Name:	screen 1.jpg
Views:	87
Size:	187.0 KB
ID:	42114   Click image for larger version

Name:	screen 2.jpg
Views:	85
Size:	163.0 KB
ID:	42115  

__________________

__________________
David Kester
Pegasus IV
wdkester is offline   Reply With Quote
Old 10-06-2012, 23:47   #2
Registered User
 
HappySeagull's Avatar

Join Date: Dec 2010
Location: B.C.,Canada
Boat: 29'
Posts: 2,395
Re: 3.0 Possible problem with polyconic charts

WD,
try turning "Quilting" off. Polyconic and Mercator don't play well together. There's something in the manual about this..
__________________

__________________
HappySeagull is offline   Reply With Quote
Old 11-06-2012, 07:49   #3
Registered User

Join Date: Jan 2007
Location: Minneapolis
Boat: Irwin 37 CC
Posts: 660
Re: 3.0 Possible problem with polyconic charts

Quote:
Originally Posted by HappySeagull View Post
WD,
try turning "Quilting" off. Polyconic and Mercator don't play well together. There's something in the manual about this..
Quilting is working well in screen 1, when I zoom in there should be no temptation to quilt the mercator chart as we are looking at a smaller area on the polyconic chart. I am thinking about deleting the mercator chart as I don't think it's necessary.
__________________
David Kester
Pegasus IV
wdkester is offline   Reply With Quote
Old 11-06-2012, 10:22   #4
Registered User
 
HappySeagull's Avatar

Join Date: Dec 2010
Location: B.C.,Canada
Boat: 29'
Posts: 2,395
Re: 3.0 Possible problem with polyconic charts

WD, I get similar oddness but open GL is off. For me, it's some kind of residual effect caused by zooming in and out...these apparently aren't Polyconic though...


Click image for larger version

Name:	Clipboard01.png
Views:	64
Size:	50.7 KB
ID:	42144

it should stay like this...

Click image for larger version

Name:	Clipboard05.png
Views:	64
Size:	26.6 KB
ID:	42145

I just remove the smallscale chart from quilting with a right click but I think something odd IS going on.
__________________
HappySeagull is offline   Reply With Quote
Old 11-06-2012, 10:31   #5
Registered User
 
HappySeagull's Avatar

Join Date: Dec 2010
Location: B.C.,Canada
Boat: 29'
Posts: 2,395
Re: 3.0 Possible problem with polyconic charts

added: first noticed in the 2.6.1718 beta which I was using at the time (and she worked consistently well otherwise! per my simple usage 12-14 hours at a stretch) but the screenshots are from 3.0.
Both Portable versions.
__________________
HappySeagull is offline   Reply With Quote
Old 11-06-2012, 10:36   #6
Registered User

Join Date: Dec 2005
Location: WNA
Boat: Dufour 35
Posts: 3,247
Re: 3.0 Possible problem with polyconic charts

Quote:
Originally Posted by wdkester View Post
Quilting is working well in screen 1, when I zoom in there should be no temptation to quilt the mercator chart as we are looking at a smaller area on the polyconic chart. I am thinking about deleting the mercator chart as I don't think it's necessary.
There seems to be a problem, in the situation with a single large scale chart against the background of a small scale chart, in a transition, when zooming in. I can recreate the black area you described in many other places quilting polyconics only. It appears just before the large scale chart takes over the full screen.

Thomas
__________________
cagney is offline   Reply With Quote
Old 11-06-2012, 15:13   #7
Registered User

Join Date: Jan 2007
Location: Minneapolis
Boat: Irwin 37 CC
Posts: 660
Re: 3.0 Possible problem with polyconic charts

I deleted the mercator and still have the problem. I tried three different harbors along the coast with the same results.
__________________
David Kester
Pegasus IV
wdkester is offline   Reply With Quote
Old 11-06-2012, 18:31   #8
Registered User
 
HappySeagull's Avatar

Join Date: Dec 2010
Location: B.C.,Canada
Boat: 29'
Posts: 2,395
Re: 3.0 Possible problem with polyconic charts

WD, there's always the hack-the-chart solution ! simply change the "Polyconic" in the header to "Mercator" and save with a new name so as not to overwrite originals. A bunch of waypoints as comparison points will show you if the position error induced is important . Most of my Poly's are hacked this way and quilt well.
__________________
HappySeagull is offline   Reply With Quote
Old 17-06-2012, 09:14   #9
Registered User

Join Date: Jan 2007
Location: Minneapolis
Boat: Irwin 37 CC
Posts: 660
Re: 3.0 Possible problem with polyconic charts

The "Black Space Polyconic Chart Bug" is more than annoying. In flyspray it is marked PRI=Low. I think it ought to be high. It happens in every instance I have tried. You can pan beyond the edge of any chart and the largest scale poly chart (if there is one) is not quilted.

I haven't done this on the water, but, it is possible to place the boat Icon, using a right click, in the black space. To me this means that if I were coming out of Knife River, heading South, I could sail into the blackness. Scary.

I used Opencpn (mostly 2.5) on a trip that started North of Baltimore and ended in Guatemala. I thought it performed very well. The earlier versions had stability problems, 2.5 didn't. That said, I don't think I will use Ocpn raster charts, in Lake Superior, until the bug is fixed. I can use the vector charts as long as I stay in US waters. The reason that I want to use raster charts is the Canadian raster charts are much cheaper for my sailing area, $150 vs $500.
__________________

__________________
David Kester
Pegasus IV
wdkester is offline   Reply With Quote
Reply

Tags
charts

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off




Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 14:28.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.