Tagged Questions

A utility used to merge small image tiles to create a bigger image

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0
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0answers
28 views

Unexpected gdal_merge result

What I'm trying to do is to merge to geotif files with gdal_merge, but the result is not what I expected. Here are the files I'm trying to merge. gdal_merge.py -n 0 -a_nodata 0 -o result.tif ...
3
votes
1answer
128 views

How do I merge DEM rasters correctly?

I've been struggling with this problem for awhile. Here is a curvature raster to illustrate the problem. I'm using 10m DEM rasters from the NRCS Data Gateway for a large portion of California. The ...
2
votes
1answer
116 views

calling gdal_merge.py into another python script running GDAL processes

Good Afternoon All, I am wanting to use gdal_merge.py to merge a series of .tif files prior to clipping the merged file to a shapefile boundary, but want to do so as part of another larger script ...
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vote
1answer
46 views

Merge artifacts and flow accumulation

I've been struggling with this problem for awhile. Here is a curvature raster to illustrate the problem http://i.imgur.com/IIjYAov.jpg I'm using 10m DEM rasters from the NRCS Data Gateway for a large ...
1
vote
1answer
108 views

GDAL Merge Py on ubuntu many tif tiles into one

Trying to batch mosaic 1000 Gtiff rasters (all in one folder) into 1 tif file via gdal merge on linux ubuntu. Having trouble with the linux command to bring in all files in a folder into the output ...
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0answers
88 views

Combine two grids with a small area of overlapping pixels to a new raster in QGIS/SAGA

Hint: the first grid is 1 byte and the second is 2 byte The new raster should have a blended transition. How can i do this?
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0answers
67 views

Merge/mosaic categorical rasters in QGIS/GDAL

I am attempting to make yearly bins of some monthly MODIS data for all of the US. The cells of the raster are defined with Julian dates indicating the date at which a burn event took place. After ...
0
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1answer
79 views

problem with feeding input files into gdal_merge.py

While merging the files using gdal_merge.py the following code works: subprocess.call([sys.executable,gmerge,'-o','C:\\r.tif','-of','GTiff','D:\\a.tif','D:\\b.tif'],shell=True) However, when the ...
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1answer
323 views

Most efficient way to tile/pyramid 4 million images using gdal for geoserver WMS

My scenario consist of 4 million geolocated images each measuring 1536x1536 pixels in size. What is the most efficient way to pyramid these images? My end goal is to serve these images using ...
0
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1answer
352 views

How to install gdal_merge to run with osgeo?

I recently installed OSGEO (http://download.osgeo.org/) which included python and gdal. I just realised however that there are many gdal libraries that were not included in this package for example ...
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0answers
70 views

gdal2tiles colorpallete error

merged few files using gdal_merge gdal_merge.py -pct -o 713.tif sa713.tif na713.tif wa713.tif ea713.tif When i try to make tiles it says gdal2tiles.py: error: Please convert this file to RGB/RGBA ...
0
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2answers
259 views

gdal_merge_raster.py ; Names of huge number of input images

gdal_merge_raster.py I am trying to make a stack including huge number of images. I am just wondering whether there is a way to avoid writing all the input images names !!!!!! Thanks
0
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1answer
262 views

How to run Layer Stack in Batch Mode with GDAL?

My goal is process fifteen Landsat-8 scenes with three bands. I need to rescale the pixel depth from 16 bit to 8 bit, stack three bands and mosaic all them. This job must be making via open source ...
1
vote
0answers
239 views

Merge overlapping DEMs with irregular boundaries

I have a 10m DEM covering part of a state, a 20m DEM covering the whole state, and a 90m DEM covering the whole country. How can I merge them together, getting the best quality available in each area? ...
1
vote
1answer
216 views

Mosaic Imagery to Tile Grid

I am hoping to come up with a script that would allow me to mosaic imagery into a polygon tile grid. My hopes is to do this with gdal or QGIS. I am wondering if anyone knows of an existing script, ...
0
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1answer
195 views

What are the differences between the photometric options for GDAL_merge?

I am using GDAL_merge to merge several geotiff tiles into one large tile. One of the creation options I can add is photometric. There are several options for this. MINISBLACK MINISWHITE RGB CMYK ...
0
votes
1answer
339 views

How to batch merge rasters using FOSSGIS tools?

I'm working with QGIS 1.8 (gdal 1.9.2) and GRASS 6.4.3...but on Windows 7. I "just" want to merge my raster. I've got a folder with 50 GTiff raster from Lidar data. The aim is to merge raster ...
4
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1answer
443 views

What is the correct way to merge adjoining raster images?

I am trying to create a raster base layer from NAIP ortho imagery. Unfortunately for me, the area of interest is very near the intersection of four image files. I have tried a few approaches to ...
3
votes
1answer
344 views

gdal_merge.py with single band raster

I'm trying to mosaic the True Marble world imagery 250M geotiffs using gdal_merge.py though one of them doesn't have RGB bands like the rest and gdal_merge fails (same number of bands is listed as a ...
1
vote
1answer
167 views

how to rename the band-names of a layer stack?

I created a layer stack of 20 images (all GTiff-files) using the gdal_merge tool in QGIS, available at: raster > miscellaneous > merge The result is a GTiff layer stack of the 20 images, but ...
0
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1answer
231 views

Is it possible to use GDAL to combine (rather than mosaic) rasters

Is there a GDAL command which can combine multiple rasters so that a unique output value is assigned to each unique combination of input values, like the combine command in ArcGIS? gdal_merge seems ...
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0answers
118 views

gdal_merge.py aligns incorrectly at the seam of two GeoTiffs

I am trying to merge four GeoTiffs from the National Elevation Dataset (EPSG: 4269) into a 2x2 DEM using gdal_merge.py. For some reason, when it merges the upper two NED rasters, gdal produces a seam ...
4
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2answers
3k views

How to add color interpretation for raster bands using GDAL?

I have 3 separate 1-band GeoTIFF files. The color interpretation for band is gray. I want a 3-band RGB file. I've used gdal_merge.py gdal_merge.py -separate file1.tif file2.tif file3.tif -o ...
3
votes
1answer
2k views

What's the difference between gdalwarp and gdal_merge for mosaicing

I wanted to merge around 20 dem tiffs each around 100MB, and I used gdalwarp (I know about virtual file option): gdalwarp $(list_of_tiffs) merged.tiff However this command took very long time, and ...
3
votes
1answer
141 views

Two versions of gdal_merge and two diffrent effects

Is there any possibility that two diffrent versions of gdal (1.7.3 and I believe 1.9.0) can give me two diffrent results with given: two RGB files.Each twith 3 layers - input1.png and input2.png ...
4
votes
1answer
547 views

gdal_merge produces incomplete mosaic

I am using GDAL 1.91 on a Windows 7 machine. I have been mosaicing large numbers of rasters together and most of the time this process works exactly as expected. However a very few of my mosaics ...