Re: grdtrack (gmt5) - possible bug?
Paul Wessel <[email protected]>
| Newsgroups | gmane.comp.gis.gmt.user |
|---|---|
| Message-ID | <[email protected]> |
Is your file a geographic grid? I.e., when you do grdinfo on it, does it say so? If not then you will need to add -fg to force that. -p On Mar 20, 2014, at 10:54 AM, Shahar Barak <[email protected]> wrote: > > The manual says: > "You may append +iinc*[**u*] to set the sampling interval (append appropriate unit); if not given then we default to half the minimum grid interval, and if geographic we select great circle distances in km as the default unit and method." > > However, when I run: > gmt grdtrack -G${grd_file} -E${LON}/${LAT}+o${AZ}+l5 > I get: > -118 33.5 -2.5 -0.0740850940347 > . > . > . > -113 33.5 2.5 0.0141758602113 > > So the distances are in degrees, not in km, as I understand from the manual. Why? > Also, it seems like that one can only specify +l in degrees, and not in km. Why? > > I also tried specifying the units in km with +i : > gmt grdtrack -G${grd_file} -E${LON}/${LAT}+o${AZ}+l5+i0.1k > > However, I get intervals of 0.1 degrees instead of 0.1 km: > -118 33.5 -2.5 -0.0834747254848 > -117.9 33.5 -2.4 -0.0538280569017 > -117.8 33.5 -2.3 -0.0227038227022 > -117.7 33.5 -2.2 0.0134101686999 > -117.6 33.5 -2.1 0.0674700662494 > -117.5 33.5 -2 0.12702396512 > > Is this a bug? > > To unsubscribe, send the message "signoff gmt-help" to [email protected] To unsubscribe, send the message "signoff gmt-help" to [email protected]