geotiff-tiffmergemosaicqgisraster
I have brought in multiple TIFF (raster) files into QGIS and want to combine them into one file. I tried this by going to Raster> Misc.> Merge. When doing this the output file comes out as gray and black and I want to keep the colors of my TIFF files.
There is a tool in the 3D Analyst toolbox called Raster Domain that does exactly this.
May be off topic because it is not a direct ArcGis solution:
For an simple routine you could use the GDAL tools gdal_merge.py in conjuction with gdal_translate to merge and cut the geo-tiffs on a data level (geotiff for example).
You will need python as well as gdal. You could install osgeo4w for windows, to get both tools in one step.
The "best-how-to-aspect" depends on the location and extention of the image cut's in the tile set you want to proceed. In a worst case it will have a fractal nature. A wild mix between many small footprints on the image borders at one side versus one big footprint overlapping many image tiles.
At least you could use a common resampling approach:
calculate and sort the image cuts vs. the tiles that are involved and store them in a list.
cut minx miny maxx maxy tiles
1 10 10 2100 4200 (1,2,3,4)
2 310 310 2100 4200 (1,2,3,4)
...
resort the list and create an list of unique merge tasks
tiles cuts
(1,2,3,4) (1,2)
merge the tiles and procced the cut for each corresponding cut-image (pseudo code)
tiles = readTile(tileList)
cuts = readCuts(cutList)
foreach tile in tiles:
proceed("gdal_merge.py -o temp_file file1, files2, file3, file 4")
foreach cut in cuts.getID():
id, minx, miny, maxx, maxy = cuts.getExtentFromCutList(cut)
proceed("gdal_translate -o cut-id -projwin minx maxy maxx miny temp_file"
Best Answer
You need to use
Merge toolfromProcessing toolbox -> GDAL/OGR -> Miscellaneous -> Mergeit has the option toGrab pseudocolor table from first layerthat you need to check, as you can see below:Do not forget to choose a proper
Output raster typethat match the raster type of the input data, or any type that is close to input raster data.For example, I have two topographic map sheets with
8 bit unsigned integer, but I don't have the same pixel type, so I choseUInt16which is16 bit unsigned integer.Input:
Here is the output after running the Merge tool: