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GIS software produces Geotiff, which contains all necessary information to place the raster in the right spot. This includes CRS information, that is usually stored inside the Geotiff file. … Furthermore, the world file can be added to any kind of raster format (jpg, png, tif), without the need to alter the raster file itself. CRS information can be stored externally in a .prj file. …

Clipping of raster files only works when the raster file has the same CRS as the vector file. The clipping is not done within Qgis, but with gdal. … So first step is Raster -> Projections -> Warp, set the desired CRS and save as Geotiff, then do the clipping on the Geotiff file. …

DO gdal_translate -of vrt -expand rgba %%N D:\Karten\gdal\gdal2tiles\NL50\%%~nN.vrt gdalbuildvrt -allow_projection_difference index.vrt NL50\*.vrt You can add the index in QGIS just like any other Raster …

Once finished with your decoration, you can convert the vector to raster, and merge it with your OS background. …

You can get the length of a line into the attribute table with the field calculator. Create a new field of type real, and add $length from the Geometry section. Being a calculator, you can add a scal …

Based on How to reproject raster from 0 360 to -180 180 with cutting 180 meridian, a possible solution using GDAL is: gdalwarp -t_srs WGS84 bluemarble.tif 180.tif -wo SOURCE_EXTRA=1000 --config CENTER_LONG …

You can use Raster -> Conversion -> Rasterize to add vector layers to a raster. … Make sure to have a RGB Raster for this. …

You can use Vector -> Research Tools -> Polygon from Layer Extent on the smaller raster. In a second step, use this polygon as a clip mask for the second raster with Raster -> Extraction -> Clipper. …

Using QGIS 1.8.0 Lisboa on Windows and Ubuntu 12.04, I had no problem opening the first .kap file from Chart 50 as raster source. And it fits good to a Openstreetmap background. …

See this tutorial: http://www.slideshare.net/shencoop/qgis-raster-to-point If you want a less densified point file, try this tutorial: http://www.gistutor.com/quantum-gis/19/54-how-to-sample-raster-datasets-using-points-in-quantum-gis-qgis.html …

If you reproject a raster to a different projection, the cell sizes do not match to the original. … UPDATE To clarify, I have created vector grids from your raster files, with the same extent and cell size: The green grid is from the original 50km- and 20km-raster, perfectly overlapping with a cell …

While the raster may be left un-georeferenced, a vector layer can not. You need coordinates in a defined CRS for the vertices of the polygon. … the size of the raster. …

The imprinted grid seems to use Ferro coordinates. So you could use EPSG:4805 as target SRS, and reference your map to it using the imprinted grid (not from canvas). Alternatively, you could create a …

you can convert a WGS84 raster of bluemarble to an ortho projection with this command: gdalwarp -overwrite -dstnodata 0 -ot Byte -s_srs "+proj=longlat +R=6371000" -t_srs "+proj=ortho +lat_0=30 +lon_0= …

Best way to avoid the black border is to set the projects CRS to that of the raster maps used. …