Add 3 arc minute relief tile containing Iceland to cache#1398

Merged

seisman merged 6 commits intomasterfrom add-cache-1arcmin

Aug 3, 2021

+1

Commits on Jul 29, 2021

Add 1 arc minute global relief data to cache
michaelgrund
authored

Commits on Jul 31, 2021

used 3 arc min grid instead of 1 arc min
michaelgrund
committed

Commits on Aug 1, 2021

Update pygmt/helpers/testing.py

michaelgrund
and
seisman
authored

Commits on Aug 2, 2021

updates based on code review
michaelgrund
committed

Commits on Aug 3, 2021