Re: NGDC binary format files

Thanks for the pointers Paul

> Date: Thu, 6 Feb 2014 13:35:38 -1000
> From: [email protected]
> Subject: Re: [GMT-HELP] NGDC binary format files
> To: [email protected]
> 
> Well, it is just a bunch of double binary values with no header info; that is in the separate format documentation (including some roundoffing).  Straightforward to make a GMT grid tnough:
> 
> xyz2grd -R18/60.98/35.4/77.65 -I2580+/2536+ -r 1_arc_a.bin -ZTLd -N99999.99999 -V -Gt.nc -fg
> 
> It says it is pixel registered but using -I1m -r computes a different nx, ny.  So perhaps it is actually gridline registered.    
> 
> -p
> 
> On Feb 6, 2014, at 1:18 PM, Lester Anderson <[email protected]> wrote:
> 
> > I have tested the file in GMT and it is not recognised - grdreformat failed to read it even using the GDAL
> > 
> > Lester
> > 
> > Date: Thu, 6 Feb 2014 15:13:17 +0000
> > From: [email protected]
> > Subject: Re: [GMT-HELP] NGDC binary format files
> > To: [email protected]
> > 
> > Have you tried to blindly use that grid as is in GMT5 and just have faith?
> > 
> > Joaquim
> > 
> > Hello,
> >  
> > I am looking to make GMT grids of the FSU magnetics data but I am not sure how to read it into GMT.
> > The header file is shown below for the binary file, and looks to be scanline
> >  
> > Cheers
> > Lester
> > file_title                       = 1 Arc Minute Grid, Region 1
> > data_type                        = image
> > palette                          = RAINBOW
> > data_byte_order                  = little_endian
> > map_projection                   = lat/lon
> > missing_flag                     = 99999.99999
> > upper_map_y                      = 77.65
> > lower_map_y                      = 35.4
> > left_map_x                       = 18
> > right_map_x                      = 60.98
> > number_of_rows                   = 2536
> > number_of_columns                = 2580
> > grid_size_y                      = 0.017
> > grid_size_x                      = 0.017
> > grid_unit                        = degrees
> > grid_origin                      = lowerleft_x
> > grid_cell_registration           = center of cell
> > data_value_unit                  = millioersteds
> > mag_anomaly_min                  = -8849.65760
> > mag_anomaly_max                  = 40586.58700
> > mag_anomaly_units                = millioersteds
> > 
> > http://www.ngdc.noaa.gov/geomag/fliers/se-0102.shtml
> >  
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> > 
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