Visualize text file with location info and intensity

I have an ascii text file containing location data (column 9-lat and 10-long) and intensity(column 20)

 200010  207  020311    40658.5  406593 52 344927.31 7100203.50  -26.2078720  127.4491855 345060.64 71开发者_如何学Python00369.14   26.4  650.3  628.0 55471.293    20.168 55648.817 55637.523  -146.062

the text file has many lines 10k+

I am trying to visualize this using GDAL, but not sure how to proceed.

Ideas?

Try QGis. It is free software for making maps with data.

GDAL is for doing sophisticated data transformations.

If your file is named viz.txt, then you can extract and plot the data using the following commands:

$ awk '{print $9, $10, $20}' < viz.txt > viz2.txt
$ gnuplot

...

gnuplot> plot "viz2.txt" with points palette

This will give you a chart, nicely coloured by intensity.

If you want a more interactive solution, or to overlay the data on a map, then you will have to use GIS software such as ArcView, MapInfo or the free tools Generic Mapping Tools (GMT) or QGIS.