Use new MEaSUREs InSAR phase-based ice velocity v1 instead of tracking-based products

[weiji14]

Improving the accuracy of our surface ice velocity (W2) layer by using MEaSUREs Phase-Based Antarctica Ice Velocity Map, Version 1! This offers 10x better precision than prior maps based on feature and speckle tracking over 80% of Antarctic continent.

Supersedes:

• 20 MEaSUREs InSAR-Based Antarctica Ice Velocity Map, Version 2

• 138 Landsat 8 Ice Speed of Antarctica (LISA), Version 1

References:

• Mouginot, J., Rignot, E., & Scheuchl, B. (2019). Continent‐wide, interferometric SAR phase, mapping of Antarctic ice velocity. Geophysical Research Letters. https://doi.org/10.1029/2019GL083826
• Mouginot, J., Rignot, E., & Scheuchl, B. (2019). MEaSUREs Phase Map of Antarctic Ice Velocity, Version 1 [Data set]. https://doi.org/10.5067/PZ3NJ5RXRH10
• Technical reference for NSIDC-0754
• AGU Press Release - Glaciologists unveil most precise map ever of Antarctic ice velocity

TODO:

• Changes with new dataset addition:
  • [x] Replace old ice-velocity data products with new MEaSUREs phase-based one (220f3b723d0379f392e1edf7c293a3ef27ab89c0)
  • [x] Split out the ice speed (magnitude) into two separate x and y velocity components (d905cb6759c43a111a61683800b6abceb6275940)
  • [x] Stick to using 450m resolution MEaSUREs Ice Velocity in data_prep.ipynb, revert #65 by not padding input datasets anymore (7cd28af533168f9e4ed0b26211ea84fefba15300)
• Model arcthitecture changes:
  • [x] Re-architect Convolutions in ESRGAN (#78) to use different kernel_size, padding and strides, bilinear resize MEaSUREs Ice Velocity to 500m on the fly (75b74936f11ee011003ef99acdceedb742063bc7)

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