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Full script that generated the error
The script generates 4 maps, for pixel or gridline grids passing as grid or matrix:
import pygmt
from pygmt.datasets import load_earth_relief
import xarray as xr
# pixel grid
fig = pygmt.Figure()
fig.grdimage("@earth_relief_01d_p", projection="W120/15c", cmap="geo")
fig.savefig("grid_p.png")
# pixel matrix
grid = load_earth_relief(registration="pixel")
fig = pygmt.Figure()
fig.grdimage(grid, projection="W120/15c", cmap="geo")
fig.savefig("matrix_p.png")
# gridline grid
fig = pygmt.Figure()
fig.grdimage("@earth_relief_01d_g", projection="W120/15c", cmap="geo")
fig.savefig("grid_g.png")
# gridline matrix
grid = load_earth_relief(registration="gridline")
fig = pygmt.Figure()
fig.grdimage(grid, projection="W120/15c", cmap="geo")
fig.savefig("matrix_g.png")
Use the command below to compare the two maps of pixel-registered grid/matrix. The RMS is zero. So passing grid or matrix give the same results:
gm compare -density 200 -highlight-color magenta -highlight-style assign -metric rmse -file diff_p.png matrix_p.png grid_p.png
Use the command below to compare the two maps of pixel-registered grid/matrix.
gm compare -density 200 -highlight-color magenta -highlight-style assign -metric rmse -file diff_g.png matrix_g.png grid_g.png
The RMS is non-zero. Here is the diff image. There are tiny difference along the x=180 line. Perhaps a 0.5 grid offset?
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