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The order of the steps to stripped Latin characters was unclear.
The new version avoids a nested list, which caused formatting problems.

Table Schema now requires XML Schema syntax for regex.

- Removes `^` and `$` anchors
- Replaces non-capture (`(?: )`) with standard groups (`( )`)
- Removes escapes (`\`) for `:`, `/`, and `'`

Switch docker image to andrejreznik/python-gdal

See merge request !6

Based on Pettersson et al. 2011
(https://10.1111/j.1468-0459.2011.00438.x):

- Add T.MEAN_THICKNESS_UNCERTAINTY '0' (0.6 km3 / 2402 km2)

Based on Martín-Español et al. 2016
(https://doi.org/10.1017/jog.2016.95):

- Add T.DATA_FLAG '3'
- Add T.REMARKS 'MEAN_THICKNESS_UNCERTAINTY: Rounded from 0.25 m. 
Assumes errors are independent and thus an overly optimistic estimate, 
according to Martín-Español et al. 2016 
(https://doi.org/10.1017/jog.2016.95).'

This reverts commit c4860502.

When the search terms listed below (case insensitive) refer to the table 
field:

- Change 'year' to 'SURVEY_DATE'
- Change 'area' to 'AREA'
- Change 'lat/lon' to 'LAT/LON'
- Change 'slope', 'avg. slope', 'mean slope' to 'MEAN_SLOPE'
- Change 'maximum thickness' to 'MAXIMUM_THICKNESS'
- Change 'mean and maximum thickness', 'mean/max thickness' to 
'MEAN_THICKNESS and MAXIMUM_THICKNESS'
- Change 'mean thickness' to 'MEAN_THICKNESS'
- Change 'interpolation method' to 'INTERPOLATION_METHOD'
- Change 'lower/upper_bound' to 'LOWER_BOUND and UPPER_BOUND'

Based on Pettersson et al. 2011
(https://10.1111/j.1468-0459.2011.00438.x):

- Add T.MEAN_THICKNESS_UNCERTAINTY '0.25' (0.6 km3 / 2402 km2)

Based on Martín-Español et al. 2016 
(https://doi.org/10.1017/jog.2016.95):

- Add T.DATA_FLAG '3'
- Add T.REMARKS 'MEAN_THICKNESS_UNCERTAINTY: Assumes errors are 
independent and thus an overly optimistic estimate, according to 
Martín-Español et al. 2016 (https://doi.org/10.1017/jog.2016.95).'

Closes #23.

Based on searches on https://scholar.google.com, 'elevation band' is 4 
times as common as 'elevation interval' in glaciological literature.

For [2082], based on Section 2.2 in Anderton, P. W. (1975). Tasman 
Glacier 1971-73, Hydrological Research Annual Report 33. Ministry of 
Works and Development for the National Water and Soil Conservation 
Organisation:

- Change SURVEY_DATE from '19869999' to '19710999' (T, TTT)

This reverts commit 3ea27de0.

Change REFERENCES from Bauder et al. 2003 
(https://doi.org/10.3189/172756403781815852), which predates 2012 
survey, to Rutishauser et al. 2016 
(https://doi.org/10.1190/geo2015-0144.1) [2184]. Point measurements in 
TTT match the map in Figure 3 of the latter.

For [339], based on Dowdeswell et al. 2002 
(https://doi.org/10.1029/2000JB000129):

- Add MEAN_THICKNESS '391' (2184 km3 / 5575 km2)
- Change AREA from '2184' to '5575'

Remove INTERPOLATION_METHOD for surveys with no MEAN_THICKNESS or 
MAXIMUM_THICKNESS (T, TT) [2078, 2079]

Based on Kirkbride & Warren 1999 
(https://doi.org/10.1016/S0921-8181(99)00021-1):

- Change SURVEY_DATE from '19869999' to '19739999' [2082]

- Add 'EM' (electromagnetic) to SURVEY_METHOD values
- Change SURVEY_METHOD from 'OTH' to 'EM' for helicopter electromagnetic 
surveys (HEM) by Finn et al. 2012 
(https://doi.org/10.3189/2012JoG11J098) [500, 6628].

Closes #7.