Opened 17 years ago
Last modified 17 years ago
#1956 assigned defect
pixel shift
Reported by: | Owned by: | sdlime | |
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Priority: | high | Milestone: | |
Component: | MapServer CGI | Version: | 4.10 |
Severity: | normal | Keywords: | |
Cc: | steven.ottens@… |
Description
We are generating tiles for a uDig -based mapping application using MapServer's WMS connection. We simply give the extents of each image requested - extents are calculated so that we always gain images on size 1024 x 1024 pixels. Extend coordinates in WMS query should be ok. The issue is that lines are uncontinuos on the border of the tiles. If line crosses the tile border on the angle 45 - 90 degrees no problems appear. However, if the angle is between 0 - 45 degrees the line is broken. See attached image. On the image the yellow line respresents tile border and the red line represents trail. White pixels are the MapServer's raster intepretation of the red line. The problem is that the "trail" line is broken (uncontinuous) on the border of tile.
Attachments (1)
Change History (9)
by , 17 years ago
Attachment: | broken_border.jpg added |
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comment:1 by , 17 years ago
I am able to provide reproducable testcase from this (size about 20mb). Testcase contains: 1) ecw raster image 2) line type shp vector layer 3) mapfile (must be edited with correct paths) 4) wms urls (must be edited with correct paths) Give me an email if someone is interested about this (jukka.sirvio@arbonaut.com)!
comment:3 by , 17 years ago
dependson: | → 1957 |
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Status: | new → assigned |
comment:4 by , 17 years ago
testcase can be downloaded from following address (at least a week): address: 194.197.204.10 username: steve password: steveli
comment:5 by , 17 years ago
Cc: | added |
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comment:6 by , 17 years ago
Cc: | added |
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comment:7 by , 17 years ago
Cc: | added |
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comment:8 by , 17 years ago
Jukka: Can you try the CVS version of GD (www.libgd.org) and see if that helps? Steve
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Here is the picture from the problem