「Raster Properties Dialog:Pyramids Tab」の版間の差分
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(ページの作成: <H3> Pyramids Tab </H3> <P> Large resolution raster layers can slow navigation in QGIS. By creating lower resolution copies of the data (pyramids), performance can be considerab…) |
([Raster Properties Dialog:Pyramids Tab]箇所のタグ調整) |
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| − | + | ==Pyramids Tab== | |
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Large resolution raster layers can slow navigation in QGIS. By creating lower | Large resolution raster layers can slow navigation in QGIS. By creating lower | ||
resolution copies of the data (pyramids), performance can be considerably | resolution copies of the data (pyramids), performance can be considerably | ||
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level of zoom. | level of zoom. | ||
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You must have write access in the directory where the original data is stored | You must have write access in the directory where the original data is stored | ||
| − | to build pyramids. | + | to build pyramids. <br /> |
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Several resampling methods can be used to calculate the pyramides: | Several resampling methods can be used to calculate the pyramides: | ||
| − | + | *Average | |
| − | + | *Nearest Neighbour | |
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| − | + | When checking the checkbox {{Template:CheckBox|Build pyramids internally if | |
| − | When checking the checkbox Build pyramids internally if | + | possible}} QGIS tries to build pyramids internally. |
| − | possible QGIS tries to build pyramids internally. | + | |
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Please note that building pyramids may alter the original data file and once | Please note that building pyramids may alter the original data file and once | ||
created they cannot be removed. If you wish to preserve a 'non-pyramided' | created they cannot be removed. If you wish to preserve a 'non-pyramided' | ||
version of your raster, make a backup copy prior to building pyramids. | version of your raster, make a backup copy prior to building pyramids. | ||
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2009年9月9日 (水) 01:10時点における版
Pyramids Tab
Large resolution raster layers can slow navigation in QGIS. By creating lower resolution copies of the data (pyramids), performance can be considerably improved as QGIS selects the most suitable resolution to use depending on the level of zoom.
You must have write access in the directory where the original data is stored
to build pyramids.
Several resampling methods can be used to calculate the pyramides:
- Average
- Nearest Neighbour
When checking the checkbox 
Build pyramids internally if
possible QGIS tries to build pyramids internally.
Please note that building pyramids may alter the original data file and once created they cannot be removed. If you wish to preserve a 'non-pyramided' version of your raster, make a backup copy prior to building pyramids.
