[Talk-us] Characterizing Systematic Errors in Hawaii and US Pacific Island Data

[Scott Atwood]

Lehua:
This is a tiny, uninhabited islet off the coast of Niʻihau.  The shoreline
data could use some cleanup, but it is roughly correct.  The boundary data
seems to come from the same low resolution source, but the 1km east
displacement error seems to have been manually corrected.

Molokini:

This is a tiny uninhabited islet between Maui and Kohoʻolawe.  The shoreline
data is roughly correct, but could use some cleanup.  There doesnʻt appear
to be any boundary data.  I suspect that this is an accidental oversight,
since this island is officially a part of Maui County.

Niʻihau:

This is smallest of the inhabited Hawaiian islands.  The shoreline data
appears to be roughly correct. The boundary data is low resolution, and
appears to have been manually shifted to correct the 1km eastward
displacement.


Next steps for Lehua, Molokini and Niʻihau:

Once again, if the political boundaries are supposed to correspond exactly
to the shoreline data, the whatever is done for Kohoʻolawe and Lanaʻi should
also be done for these three islands to correct the political boundaries.
 The rest of the data can be easily cleaned up manually.

-Scott

-- 
Scott Atwood

Cycle tracks will abound in Utopia.  ~H.G. Wells
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