The GDAL command to build a VRT (Virtual Dataset).

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can I preserve a fading alpha layer when mosaicing images with gdal?

I am mosaicing some images with gdal and would like to improve the final result by using a fading / gradual alpha layer towards the edge of each image to remove the sharp edges in the middle of the ...
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61 views

OS terrain 50: .vrt from zip files

I tried to follow what was suggested in How to use OS Terrain 50 in QGIS, but I got the following problem: in spite of being generally able to generate .vrt files using gdalbuildvrt from unzipped ...
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45 views

Changing pixel values of GDAL VRT

Is it possible to manipulate the pixel values of a GDAL VRT and, if so, how? The original data must remain unchanged. I have a dataset which might be a bit rotated so that there are no data values on ...
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32 views

How to dynamically change the draw-order of geotiff rasters in QGIS?

In ArcGIS it is possible, via raster mosaics, to choose the raster order depending on various methods. One such method is the center method. The raster that is closest to the coordinate of the center ...
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250 views

Importing multiple GeoTiffs in TileMill

I am a software engineer that is very new in the geo world. So excuse my ignorance if this question seems simple or if terms I use are totally wrong. Problem: I have been tasked with taking multiple ...
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137 views

How to prevent transparent borders (collars) of a tif wipe out overlapping regions of adjecent tif while using gdalbuildvrt

I have a set of Geotifs that have got transparent borders (collars) of irregular shapes & dimensions around them. First I created a VRT over this set of Geotifs through gdalbuildvrt. Then I ...
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37 views

Problem defining the tiling starting point

We are tiling a image datasets. However, we want to specifically define custom windows. To do this, we are using -te option during warping. The warped output is then tiled. The problem though is that ...
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462 views

How do I load offline google map/earth vrt files as a backdrop in qgis

I was trying to follow the process : saving-google-earth-location in order to cache google maps/earth offline for digitizing, but I am fairly new to qgis. When I try to add the vrt file as a raster ...
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242 views

`gdalbuildvrt` and selecting individual bands

I want to produce a set of VRTs (GDAL's internal virtual rasters) that comprise a re-arrangement of bands of a number of individual GeoTIFF files. Say I have my initial set of GeTIFF files, all having ...
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123 views

Tile generation (gdal2tiles): 'merge' old and new (overlapping nodata) tiles?

I have a task that can be done by brute force - if a specific map region has changed at a given scale, upload new geoTIFF at that scale, then rebuild the tile pyramid for that scale. (I don't create ...
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144 views

How to build .vrt of shapefiles?

I've a huge number of shapefiles and I would like to create a VRT as I do with gdalbuilvrt for raster. I find here https://github.com/dwtkns/gdal-cheat-sheet that it should be possible and the format ...
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116 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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202 views

VRT vs KML superoverlay

We've got GB's of raster data that I want to make available as mosaics with overviews internally within my office. We have people using ArcGIS (although we are never all at the same version) and we ...