Re: GMT 4: combining GRD files into one FILE with several LAYERS
"Becker, Joseph J." <[email protected]>
| Newsgroups | gmane.comp.gis.gmt.user |
|---|---|
| Message-ID | <hgZo2uyWzR5AVJ02cIUki5lGUmJu6O5JJe1o_LTbL7oZEaMKoLy3naGE7ZSqmtZVVYmiJhdVeI0@cipher.nrlssc.navy.mil> |
This data is essentially something along the lines of layer 1 = topogrpahy layer 2 = gravity layer 43= FFT(gravity) + sqrt (topo) (or something crazy like that)... and so on. In effect a global gird of all known “measurements", not so much “n dimensional” although that is certainly a good way to think of it. Does that change any facts, your opinion, etc… -jj On Feb 10, 2014, at 5:39 PM, Paul Wessel <[email protected]> wrote: > Hi JJ_ > > GMT can read from layer "a" but does not write 3-D grids. Given that I would not try to do a 256-layer file. > > -p > > On Feb 10, 2014, at 9:46 AM, Becker, Joseph J. <[email protected]> wrote: > >> I have 256 global grids at 15 second resolution; e.g. ~16 GB grd files * 256 grids = 4 TB of data. >> >> I want to automate some processing that uses tiny patches (16x16 nodes) of each and every one of these 256 files. And I step that over the globe. >> >> Off hand it seems like it might make sense (code re-use and simplicity) to combine all that data into a single grid with 256 layers. >> >> Is this practical? >> >> Anyone have some examples of doing things like this: >> >> grdmath on layer "a" writing result to layer "b" >> >> grdmask xy files > "layer" >> >> and so on. >> >> thanks! >> >> >> -jj >> >> To unsubscribe, send the message "signoff gmt-help" to [email protected] > > To unsubscribe, send the message "signoff gmt-help" to [email protected] To unsubscribe, send the message "signoff gmt-help" to [email protected]