# Plot points from a .txt file on a pygmt map **URL:** \ **Category:** PyGMT Q&A\ **Created:** [February 1, 2022, 9:16am UTC](https://forum.generic-mapping-tools.org/t/plot-points-from-a-txt-file-on-a-pygmt-map/2580 "2022-02-01T09:16:05Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![f.riva48](https://avatars.discourse-cdn.com/v4/letter/f/b5ac83/32.png) [@f.riva48](https://forum.generic-mapping-tools.org/u/f.riva48)\ **Post date:** [February 1, 2022, 9:16am UTC](https://forum.generic-mapping-tools.org/t/plot-points-from-a-txt-file-on-a-pygmt-map/2580/1 "2022-02-01T09:16:06Z")
Hello. I have a topographic map of North Irleand and I would like to plot seismic stations as points on it. I have a “.txt” file with the name and coordinates (longitude and latitude) of the seismic stations I want to plot and they are divided by sep. stat = pd.read\_csv(“stat.txt”, sep=’\s+’) stat.columns =[‘net’, ‘stat’, ‘Longitude’,‘Latitude’] stat.Longitude= stat.iloc [:,2] stat.Latitude= stat.iloc [:,3] x=stat.Longitude stat.Longitude.head() stat.Latitude.head() fig = pygmt.Figure() fig.basemap(region=region, projection=“M15c”, frame=True) #x1=[] #y1=[] #x1=stat1[:,2] #y1=stat1[:,3] pygmt.makecpt(cmap=“palette-topo.cpt”, series=[-1000, 1000, 3]) dgrid = pygmt.grdgradient(grid=“donegal2.nc”, azimuth=90, outgrid=‘donegal2.grd’) fig.grdimage(grid=‘donegal2.nc’, shading=‘donegal2.grd’, region=region, dpi=300, projection=‘M12c’, frame=False, cmap=True) #fig.coast(region=region, land=“black”, water=“skyblue”) #fig.plot(x=stat.Longitude, y=stat.Latitude, size=2 , style=‘cc’, color=“white”, pen=“black”) fig.show() this is the cell that I run for the plot but it gives me this error: TypeError Traceback (most recent call last) ~\AppData\Local\Temp/ipykernel\_24428/2680221259.py in 13 14 #fig.coast(region=region, land=“black”, water=“skyblue”) —\> 15 fig.plot(x=stat.Longitude, y=stat.Latitude, size=2 , style=‘cc’, color=“white”, pen=“black”) 16 17 fig.show() TypeError: len() of unsized object How can I solve it? Thanks 🙂 ---
**Author:** ![ahmetanildindar](https://yyz1.discourse-cdn.com/flex047/user_avatar/forum.generic-mapping-tools.org/ahmetanildindar/32/119_2.png) [@ahmetanildindar](https://forum.generic-mapping-tools.org/u/ahmetanildindar)\ **Post date:** [August 6, 2023, 7:17am UTC](https://forum.generic-mapping-tools.org/t/plot-points-from-a-txt-file-on-a-pygmt-map/2580/2 "2023-08-06T07:17:35Z")
It is interesting but size parameter must be an array. Thus, your line should be as below: 15 fig.plot(x=stat.Longitude, y=stat.Latitude, size=[2] , style=‘cc’, color=“white”, pen=“black”) Please notice, I’ve put size value into array, nothing else.