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i have xyz-files (laserscanning, but already as a regular raster) that i converted to vector files. everything is fine, but when i try to convert them to raster via interpolation (TIN, 1x1 meter resolution), qgis "forgets" some points to interpolate.

why is that?

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I doubt we have enough information to even start guessing what could be going wrong. Can you provide a data sample or at least a screenshot? Currently the question is very vague. –  underdark Jun 9 '13 at 20:24
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