I've been given two .asc files containing a 1m raster data from a LiDAR survey. I only have access to QGIS.2.14.1 (which I'am using for the 1st time only having previous experience with ArcGIS) and I am struggling to import the files due to their size given that they are 2.2 and 6GB respectively. Is there a function to reduce the size/mosaic the file to enable import in QGIS or any other program?
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Welcome to GIS:SE @Robert! Perhaps this post might help: Manipulate .asc files in qgis – Joseph May 5 '16 at 14:20
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also see gis.stackexchange.com/questions/1104/… to convert them to much smaller (and faster) geotiffs – Ian Turton♦ May 5 '16 at 14:41
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My suggestion:
- 1st: convert to tif
- 2nd: create pyramids
- 3rd: see gdal tools (gdaladdo and gdal_convert) for more options
answered May 5 '16 at 21:05
