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

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93 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 ...
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1answer
341 views

Can't get gdal_merge Python script to run

I downloaded and installed GDAL. I am using Python 27. I had to use the following commands at the IDLE Python GUI: from osgeo import gdal,ogr sys.path.append('C:\Program Files\GDAL') import ...
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431 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? ...
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45 views

GDAL merge; Why add 0.1?

In the implementation of gdal_merge: https://svn.osgeo.org/gdal/trunk/gdal/swig/python/scripts/gdal_merge.py a value of 0.1 is added to the conversion from geo-referenced coordinates to pixel ...
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0answers
223 views

ImportError: No module named gdal qgis2.8.1

i am using QGIS 2.8.1 (32 bit) in windows 7). I imported two DEMs and trying to merge (QGIS>Raster>Miscellaneous>Merge)them. Unfortunately it gives me import error as below. Traceback (most recent ...
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80 views

gdal_merge shifts rasters after processing, layer stack is slightly off

I have experienced that gdal shifts rasters. The outputs of gdal_warp are often skewed, have different pixel sizes and so forth. A known error which has also been discussed here. But now, I had to ...
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0answers
64 views

Serving GeoTIFFs of different resolutions as single layer

I'm trying to serve a 30 arc second DEM with global coverage combined with high resolution 1/3 arc second DEM for a very small area. I believed at first I could combine them into a single file, ...
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138 views

Using gdal_merge to merge a large amount of files (in pairs)

I'm new to python and how it can be applied to gis. I have a large amount of MODIS files to go through and I've already extracted, reprojected and converted to GTiff the bands that I need from each ...
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189 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 ...
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20 views

How to fix GDAL_Merge problem?

I've got a lot of modis images (MOD15A2 productos -- LAI) separated by years. Inside each year folder there are the folders with the days i.e 049 folder for DOY 049. What I've done so far is to ...
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45 views

merge tif file with No data

I have to 2 tiff files, both of file have No data values as in Image 1, when I use gdal_merge to mosaic both images to one image, the No data area turns to black, which I don't want, How to maintain ...
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39 views

gdal_merge was unexpected at this time

I am using gdal_merge to create an raster from around 250 files (rasters). when I run the command i got gdal_merge was unexpected at this time The command is correct as if I split the files it works ...
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48 views

What are the units in GMTED2010 elevation data?

I have downloaded the GMTED2010 elevation data from http://topotools.cr.usgs.gov/gmted_viewer/viewer.htm I am merging all the files/tiles (to create a global dataset) with: gdal_merge.py There is ...
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106 views

gdal_merge tries to create image with negative dimensions

I am trying to use gdal_merge.py to create a mosaic from a set of geotiffs, however the command fails with the error message: "ERROR 1: Attempt to create -3510x1817 dataset is illegal,sizes must be ...
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147 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 ...