Hi Paulo, The script mp_graticule.jnl can be used to draw lines at any set of x and y locations on a map-projection plot. If you look at the script, go/help mp_graticulehere are the arguments. ! Usage: arg1 arg2 arg3 arg4 arg5 arg6 arg7 arg8 ! go mp_graticule [lon_min] [lon_max] [lon_delta] [lat_min] [lat_max] [lat_delta] [pen] [winflag] To plot lines at the grid boundaries, you could use pseudo-variables xboxlo, xboxhi, xbox, etc to set the min, max, and delta values so the lines will be drawn atthe edges of the x and y axis cells of your original variable , e.g. if the variable you're plotting is called "var", go mp_graticule `xboxlo[gx=var,x=20]` `xboxhi[gx=var,x=300]` `xbox[gx=var,x=1]` `yboxlo ...Where you'd put in the particular range of longitudes and latitudes you're using or get the range from the grid of the variable. To put dots at the CENTERS of the grid boxes is easy. Say your map projection plot command is: shade/noax mp_mask*sst, x_page, y_pageThen just plot/over/vs mp_mask*x_page, mp_mask*y_pageIf you look at the map projection scripts, go/help mp_orthographicyou'll see these commands at the start of all the scripts: let/quiet mp_x = xThe x and y here refer to the x and y coordinates of the variable you specified with the "SET GRID var". (This is why that SET GRID command is needed). After running mp_orthographic.jnl, a bunch of variables have been set up based on this mp_x and mp_y. If you now say, let/quiet mp_x = xboxlothen when any of the map projection variables are used, they are still defined in terms of mp_x and mp_y, but these now refer to the edges of the grid cells of your original variable. Do this AFTER making the color plot of the variable. So, this command will put dots at the grid cell corners: plot/over/vs/sym mp_mask*x_page, mp_mask*y_pageTry this quick script to illustrate this: I've zoomed in and used SHADE so we can see the grid cells easily use coads_climatology Or use sym=dot which makes a tiny dot and looks particularly nice when you run Ferret in gif mode. Ansley Paulo Santiago wrote: Hi Ferreters, |