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

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2answers
89 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 ...
1
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1answer
73 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 ...
0
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1answer
229 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?
2
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0answers
35 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 ...
2
votes
0answers
150 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 ...
2
votes
0answers
365 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
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0answers
75 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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0answers
152 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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0answers
18 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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0answers
80 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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0answers
137 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 ...