I have around twenty 2 GB DEMs (xyz) in .asc format.
The header has 13 lines of metadata, and then the basic data in three columns
# # The DTM grid had lower left (southwest) corner coords: # X or easting = xxxxxxx.xx meters # Y or northing = xxxxxxxx.xx meters # and grid intervals: # X (east) grid interval = 2.0000 meters # Y (north) grid interval = 2.0000 meters # For a total of 10001 x 2506 = 25062506 points. # # CE/LE = -9999.0000 /-9999.0000 # There may be less points in this file because those # grid points that were outside of the polygon that # defined the DTM boundary are not included in this file. # 100000.0000 1000000.0000 500.0000 100002.0000 1000000.0000 500.0000 100004.0000 1000000.0000 500.0000 100006.0000 1000000.0000 500.0000 100008.0000 1000000.0000 500.0000 ...and so on
I tried to open this file as grid in SAGA GIS and in ArcGIS, but with little success. Eventually I circled around this by converting the files to .txt then with lasTools to .las and furthermore to .tif, when I'm finally able to view the DEM. However, this seems a little bit too complicated. Are there any fast workarounds for correctly reading the file in to SAGA or ArcMap OR is there a fast way to manually edit the headers, e.g. to the format ESRI requires? My file size prevents me from editing them manually in notepad/wordpad or in other basic programs.