# Convert latitude longitude grid to x Y grid in meters **URL:** \ **Category:** Q&A\ **Tags:** gmt\ **Created:** [February 12, 2023, 10:06pm UTC](https://forum.generic-mapping-tools.org/t/convert-latitude-longitude-grid-to-x-y-grid-in-meters/3669 "2023-02-12T22:06:47Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![piyushether](https://yyz1.discourse-cdn.com/flex047/user_avatar/forum.generic-mapping-tools.org/piyushether/32/87_2.png) [@piyushether](https://forum.generic-mapping-tools.org/u/piyushether)\ **Post date:** [February 12, 2023, 10:06pm UTC](https://forum.generic-mapping-tools.org/t/convert-latitude-longitude-grid-to-x-y-grid-in-meters/3669/1 "2023-02-12T22:06:48Z")
Hi, I am trying to convert my file containing latitude, longitude, and parameter value into x y in meters. I tried `mapproject,` but I am not sure whether it provides the correct output or not. My data are in 0.025 x 0.025-degree spatial resolution. `gmt mapproject latlon.txt $r -Jm0.025 > xy.txt` Later, I converted my file into a grid file using `xyz2grd` and tried to use `grdproject,` but the story was the same. `gmt grdproject latlong.nc $r -Jm0.025 -Gnxy.nc` It will be very much appreciated if I will get some suggestions on it. ---
**Author:** ![Andreas](https://avatars.discourse-cdn.com/v4/letter/a/ee7513/32.png) [@Andreas](https://forum.generic-mapping-tools.org/u/Andreas)\ **Post date:** [February 12, 2023, 10:41pm UTC](https://forum.generic-mapping-tools.org/t/convert-latitude-longitude-grid-to-x-y-grid-in-meters/3669/2 "2023-02-12T22:41:41Z")
Long shot: try to add `-C -F` to those commands. ---
**Author:** ![pwessel](https://yyz1.discourse-cdn.com/flex047/user_avatar/forum.generic-mapping-tools.org/pwessel/32/30_2.png) [@pwessel](https://forum.generic-mapping-tools.org/u/pwessel)\ **Post date:** [February 12, 2023, 10:46pm UTC](https://forum.generic-mapping-tools.org/t/convert-latitude-longitude-grid-to-x-y-grid-in-meters/3669/3 "2023-02-12T22:46:09Z")
Yes, you are not plotting at x cm/degree you know; you want a scale 1:1 to do meters. ---
**Author:** ![piyushether](https://yyz1.discourse-cdn.com/flex047/user_avatar/forum.generic-mapping-tools.org/piyushether/32/87_2.png) [@piyushether](https://forum.generic-mapping-tools.org/u/piyushether)\ **Post date:** [February 12, 2023, 11:10pm UTC](https://forum.generic-mapping-tools.org/t/convert-latitude-longitude-grid-to-x-y-grid-in-meters/3669/4 "2023-02-12T23:10:47Z")
That’s mean I should follow `gmt mapproject latlon.txt $r -Jm0.025/1:1 -C -F > xy.txt` `gmt grdproject latlong.nc $r -Jm0.025/1:1 -Gnxy.nc -C -F` Are both correct? ---
**Author:** ![Joaquim](https://yyz1.discourse-cdn.com/flex047/user_avatar/forum.generic-mapping-tools.org/joaquim/32/16_2.png) [@Joaquim](https://forum.generic-mapping-tools.org/u/Joaquim)\ **Post date:** [February 12, 2023, 11:23pm UTC](https://forum.generic-mapping-tools.org/t/convert-latitude-longitude-grid-to-x-y-grid-in-meters/3669/5 "2023-02-12T23:23:40Z")
Why don’t you use the much simpler **-J\** variant? ---
**Author:** ![piyushether](https://yyz1.discourse-cdn.com/flex047/user_avatar/forum.generic-mapping-tools.org/piyushether/32/87_2.png) [@piyushether](https://forum.generic-mapping-tools.org/u/piyushether)\ **Post date:** [February 12, 2023, 11:31pm UTC](https://forum.generic-mapping-tools.org/t/convert-latitude-longitude-grid-to-x-y-grid-in-meters/3669/6 "2023-02-12T23:31:55Z")
> [@Joaquim](#): > > -J\ I am sorry @Joaquim but I didn’t get you. I am using `-Jm`. Are you suggesting different? could you please elaborate? ---
**Author:** ![Joaquim](https://yyz1.discourse-cdn.com/flex047/user_avatar/forum.generic-mapping-tools.org/joaquim/32/16_2.png) [@Joaquim](https://forum.generic-mapping-tools.org/u/Joaquim)\ **Post date:** [February 13, 2023, 12:00am UTC](https://forum.generic-mapping-tools.org/t/convert-latitude-longitude-grid-to-x-y-grid-in-meters/3669/7 "2023-02-13T00:00:19Z")
See the manual f **-J**. At the end it explains and has examples on how to use the proj4 syntax.