Artifacts on WMTS image tiles
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- JavaScript
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Description
[Reported on the forum](https://community.cesium.com/t/weird-artifacts-with-wmts-map-tiles/25122).
> I’m working on some code which can move map tiles (created from geo-tiff), and I’m getting some weird visual effect.
I don’t know if this is a bug in the CesiumJS engine, or I’m doing something wrong.
Any help would be appreciated.
> Here’s the [sandcastle example](https://sandcastle.cesium.com/#c=hVRrc9o4FP0rHj6ZWVcsbJ6FZLalWdYeTDZA2ibDTEfIIhaWJa8lA2an/32vn3EgSc0HLPmec+8990hECqWN/xbCgMejKyaoZxUrW4rntylVMokJLXemlGgsnni1njNOXRzNaLxhhNohfqJx+k8sN8yjcRnzldFtvfhGly6NCdYyBiwTTzPi05AuxE/jytgy4cktGlLFkrC/ENkPakBQH064/kQIVWouAyqMq4Ju0aKp4y9HhN0yx77f290Js5UtpqdkaJ/ZQfT969C5RBD0rzcKIMjuuXuHT77Yvcdh13fDm9Px/O7EXd/oh/Bu+zDrMvfLlE/mk7Xbc9jjPGDjoRM9Apm7DlJ3tmX421+/22u5m8zdLuAAG3RXd2jtPp339PlIBMHJh5vL0fne934M5dz5fO/8cen//Wkc7kafp+OuDBatvDeSj2CTqwPNC7otpTIXLZJLMJRCY5hMvGi1GxC5WimqAVKOb/fR+NBDp6XCKaxO0Bko2oAME6Vl2FQc4KtEEM2kMEwZZf+qXTG+MSVEMOem9pmyjArSrxIdp0BRLLXUaZQlu12uwTuIxBRrar6VoEZkvO8xoryvOCHAAOzHob+sCWnw7veHuZxgzTa0dvYLYXaWkVoGpxvKLSOmClxYi8RhBnED9cue3srYlPW1hHkrWUa2MszyrJp15nZdUPYU495SlfmjjkH5xm+lc9Cufwig+ACQb7wDgFtB+y8QxU4NSY8gQsYHkGLnVcjzW1Pi7IzUsplZU1ZRiZV3YBU52iXPz0q3mOokFs9M/ZeHAyvIbnvA3724uOienPWrL1R4kWRCV7cghDTuRPSjcPPNQZRZZC1pF6IYYGYXsELIVEZzyIxWVBPfUVKY7aP0EI+3mNX4Ru3s5ZVbR757MaMV8NzHvCw0U7XRllmltY6qbFtNr+mGyz/mLMfnzWzXs2gflz3GaV5zcQmi5q5C2PMO6jYPui0YmyiEeeTjbJL5p5J3L6EoaTYDC2jLag2UTjm9rrr6k4UReMhIQB2EOpqGEYcRq84yIQF4lChV2WvQaUIHHtsYzLt65e42CAcvwJdVwvmM7emidT3oQPwRlEvsgXS3GxpznGZhfvd6XGwihAYdWL6O1FLyJY4PmP8H)
> The effect I’m referring to is that when you zoom in, stripes of transparency appear on the imagery layer. When zooming out, the stripes go away.
I can’t understand what 's causing them.

Contributor guide
Research direction
Start by reproducing the linked Sandcastle example and compare the imagery while zooming in and out. Trace the WMTS imagery and tile-rendering entry points to isolate the source of the transparency stripes; done means the reproduction is explained and the artifact is fixed or clearly documented.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- javascript
- Domain
- frontend, web-dev
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Needs clarification
- Newbie friendliness
- 30/100