# Surface map plot **URL:** \ **Category:** Q&A\ **Created:** [November 24, 2021, 4:30pm UTC](https://forum.generic-mapping-tools.org/t/surface-map-plot/2367 "2021-11-24T16:30:52Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![parker](https://avatars.discourse-cdn.com/v4/letter/p/c6cbf5/32.png) [@parker](https://forum.generic-mapping-tools.org/u/parker)\ **Post date:** [November 24, 2021, 4:30pm UTC](https://forum.generic-mapping-tools.org/t/surface-map-plot/2367/1 "2021-11-24T16:30:52Z")
Hello everyone. Please I need an assistance, I try to plot surface map with an amplitude but is not working, only the map shows but other gave me errors. please help out. Below is the code and the data #!/bin/bash gmt begin South\_Africa pdf ``` gmt set MAP_FRAME_TYPE plain gmt set FONT_LABEL 16p gmt makecpt -Cjet -T-15/30/2 ``` gmt pscoast -R16/33/-35/-22 -JM20c -BWSne -Baf -I1/1p,0/200/251 -W1,black -Gwhite -Di -N2/0.25p,black -Na/0.5,black -Swhite \> SA.ps gmt makecpt -Cmag -T-10/30 -H \> my.cpt gmt surface ppp\_amp.dat -R16/33/-35/-22 -JM20c -I1/1p,0/200/251 -GSouthAfrica\_grd.nc -T0.25 -C0.1 -Vi Long Lat Height 20.81 -32.38 3.462601451 23.99 -30.67 3.47238561 27.71 -25.89 2.983290468 19.22 -34.42 3.370191352 27.69 -25.89 2.809467594 25.54 -25.81 3.047883036 28.22 -25.75 3.370601204 28.22 -25.75 3.491404931 32.08 -28.8 2.386482489 17.88 -29.67 3.347240755 20.81 -32.38 3.018843543 30.38 -23.08 2.779844546 31.42 -28.29 2.419745172 28.67 -31.55 1.835212073 37.86 -46.88 10.3258571 28.22 -25.75 3.626294693 28.22 -25.75 3.588034193 26.72 -30.68 3.450797176 26.3 -29.1 1.810321089 27.43 -32.86 1.801976579 27.78 -25.64 3.479390519 28.73 -25.8 3.277078322 18.45 -34.35 2.622937276 26.51 -33.32 2.545416159 24.54 -32.25 2.302805262 28.37 -26.51 3.308374094 27.69 -25.89 2.069509857 30.07 -30.15 0.466945394 24.81 -28.74 3.915630899 29.42 -30.57 1.299706356 27.77 -26.08 3.266030423 27.24 -27.66 3.85353708 18.73 -32.46 6.780467738 29.45 -25.77 2.199781941 39.99 -29.21 3.071521361 30.96 -25.48 2.896929353 28.33 -28.25 3.522047204 26.74 -26.93 1.46070852 23.37 -34.06 1.786851179 28.93 -24.01 3.291937952 28.28 -25.73 4.369096225 22.75 -29.67 3.76435148 29.47 -23.92 4.714191319 30.76 -30.29 2.10941761 17.88 -29.67 3.974042045 31.29 -29.34 4.746402624 20.81 -32.38 2.731779255 26.74 -27.98 3.802077695 19.45 33.65 4.360541202 28.34 -26.2 3.261933725 28.33 -28.25 2.492962693 19.76 -31.48 3.450588564 18.47 -33.95 4.163197896 30.95 -29.97 1.505421449 27.83 -33.04 3.704138425 27.7 -23.69 3.394110991 29.41 -25.16 2.970443754 22.38 -34 3.746083503 30.58 -29.07 4.720041485 18.16 -32.97 3.7565446 29.78 -28.56 2.248874066 31.13 -23.95 3.142481019 25.61 33.99 4.184718732 22.57 -32.35 3.293254127 21.26 -28.41 7.080971271 30.38 -29.6 3.505024481 ![image](https://canada1.discourse-cdn.com/flex047/uploads/gmt/original/2X/d/d8bbb380b3307a27d7557e635d9b1c6f632c80dc.png) ---
**Author:** ![Esteban82](https://yyz1.discourse-cdn.com/flex047/user_avatar/forum.generic-mapping-tools.org/esteban82/32/54_2.png) [@Esteban82](https://forum.generic-mapping-tools.org/u/Esteban82)\ **Post date:** [November 24, 2021, 4:57pm UTC](https://forum.generic-mapping-tools.org/t/surface-map-plot/2367/2 "2021-11-24T16:57:00Z")
What errors did you have? ---
**Author:** ![parker](https://avatars.discourse-cdn.com/v4/letter/p/c6cbf5/32.png) [@parker](https://forum.generic-mapping-tools.org/u/parker)\ **Post date:** [November 25, 2021, 6:02pm UTC](https://forum.generic-mapping-tools.org/t/surface-map-plot/2367/3 "2021-11-25T18:02:31Z")
Good evening, Please sorry for replying you late. below is the warning gotten [INFORMATION]: Cartesian input grid surface [INFORMATION]: Cartesian input grid surface [INFORMATION]: Grid domain: W: 16 E: 33 S: -35 N: -22 n\_columns: 17 n\_rows: 13 [gridline registration] surface [WARNING]: Your grid dimensions are mutually prime. Convergence is very unlikely. surface [INFORMATION]: Hint: Choosing -R15/35/-36/-20 [n\_columns = 20, n\_rows = 16] might cut run time by a factor of 4.1744444 ---
**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:** [November 25, 2021, 8:32pm UTC](https://forum.generic-mapping-tools.org/t/surface-map-plot/2367/4 "2021-11-25T20:32:14Z")
You are gridding the data but you are then not plotting the grid. Unless you did not show us that part of the script. You can plot the grid as contours (grdcontour) or image (grdimage), for instance. ---
**Author:** ![parker](https://avatars.discourse-cdn.com/v4/letter/p/c6cbf5/32.png) [@parker](https://forum.generic-mapping-tools.org/u/parker)\ **Post date:** [December 6, 2021, 12:03pm UTC](https://forum.generic-mapping-tools.org/t/surface-map-plot/2367/5 "2021-12-06T12:03:19Z")
Hello sir, Thanks for your response, I am sorry for replying late, I am on vacation and i traveled to my Country. the script I show is the script Iused. Please can you direct me to the GMT 6.1.1 documentation I can read to have an idea to plot the surface map rather then gridding. Hope to hear from you soon Thanks and best regards . ---
**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:** [December 6, 2021, 5:57pm UTC](https://forum.generic-mapping-tools.org/t/surface-map-plot/2367/6 "2021-12-06T17:57:51Z")
The [tutorial](https://docs.generic-mapping-tools.org/dev/tutorial.html) maybe?