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I have 100 rasters, each raster has the same cell size and extent and i want to make a polygon over of each cell. Can anyone help me doing this?

Thanks in advance.

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Is Raster to Polygon what you're looking for? Or do you want a bunch of cell-shaped polygons? –  Erica Mar 13 '13 at 16:13
If the rasters are the same, and you know their extent, you can use the Create Fishnet tool in ArcMap. there you can set the origin coordinate, and number of lines rows and/or cell size, to create a mesh of polygons. –  HDunn Mar 13 '13 at 16:55
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2 Answers

If you are looking for cell shaped polygons, as in a grid layer out, you can use the Vector Grid tool in QGIS (Vector - Research Tools). In the tool, you can use the raster files as the grid extents, and set the Parameters to the cell size. This will make a grid polygon layer with each grid to the size of the raster cell (and spatially overlaying the raster).

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If it is an exact "grid" of polygons over the rasters you are looking for then it is simply (i say simply because i asked the same question a short time ago.

the basic answer is In QGIS go to Raster -> Misc. -> Tile index. Give the path to the raster-files, set the name and directory for the resulting shape.

to give credit to the original answer: Help with grid creation in QGIS

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