Use `Affine` transform in GeoTIFF loading

[eliascarv]

Comparison: master:

PR:

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (8644448) 94.12% compared to head (a05573a) 93.98%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #68 +/- ## ========================================== - Coverage 94.12% 93.98% -0.14% ========================================== Files 17 17 Lines 1055 1048 -7 ========================================== - Hits 993 985 -8 - Misses 62 63 +1 ```

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