Mercurial > hg > GlobalNeighbors

annotate globalneighbors/schema.py @ 1:1b94f3bf97e5

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* limit distance function * start gridding * improve unicode handling
author Jeff Hammel <k0scist@gmail.com>
date Sat, 24 Jun 2017 14:02:14 -0700
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1 """
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2 Schema for cities 1000
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3 From http://download.geonames.org/export/dump/
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4 """
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5
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6 from collections import OrderedDict
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7
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8
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9 # column descriptions
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10 descriptions = {
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11 'geonameid' : "integer id of record in geonames database",
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12 'name' : "name of geographical point (utf8) varchar(200)",
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13 'asciiname' : "name of geographical point in plain ascii characters, varchar(200)",
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14 'alternatenames' : "alternatenames, comma separated, ascii names automatically transliterated, convenience attribute from alternatename table, varchar(10000)",
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15 'latitude' : "latitude in decimal degrees (wgs84)",
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16 'longitude' : "longitude in decimal degrees (wgs84)",
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17 'feature class' : "see http://www.geonames.org/export/codes.html, char(1)",
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18 'feature code' : "see http://www.geonames.org/export/codes.html, varchar(10)",
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19 'country code' : "ISO-3166 2-letter country code, 2 characters",
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20 'cc2' : "alternate country codes, comma separated, ISO-3166 2-letter country code, 200 characters",
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21 'admin1 code' : "fipscode (subject to change to iso code), see exceptions below, see file admin1Codes.txt for display names of this code; varchar(20)",
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22 'admin2 code' : "code for the second administrative division, a county in the US, see file admin2Codes.txt; varchar(80)",
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23 'admin3 code' : "code for third level administrative division, varchar(20)",
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24 'admin4 code' : "code for fourth level administrative division, varchar(20)",
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25 'population' : "bigint (8 byte int)",
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26 'elevation' : "in meters, integer",
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27 'dem' : "digital elevation model, srtm3 or gtopo30, average elevation of 3''x3'' (ca 90mx90m) or 30''x30'' (ca 900mx900m) area in meters, integer. srtm processed by cgiar/ciat.",
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28 'timezone' : "the iana timezone id (see file timeZone.txt) varchar(40)",
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29 'modification date' : "date of last modification in yyyy-MM-dd format"
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30 }
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31
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32
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33 # schema of python types to cast to
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34 types = OrderedDict([
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35 ('geonameid', int),
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36 ('name', str),
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37 ('asciiname', str),
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38 ('alternatenames', str),
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39 ('latitude', float),
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40 ('longitude', float),
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41 ('feature class', str),
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42 ('feature code', str),
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43 ('country code', str),
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44 ('cc2', str),
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45 ('admin1 code', str),
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46 ('admin2 code', str),
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47 ('admin3 code', str),
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48 ('admin4 code', str),
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49 ('population', int),
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50 ('elevation', int),
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51 ('dem', int),
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52 ('timezone', str),
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53 ('modification date', str)
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54 ])
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55
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56
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57 # Fields we care about; we'll discard the rest
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58 fields = (
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59 'geonameid',
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60 'name',
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61 'asciiname',
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62 'latitude',
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63 'longitude',
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64 'country code',
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65 'population',
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66 )
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67
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68 # Keys we care about
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69 name = 'asciiname'
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70 primary_key = 'geonameid'
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71
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72 # fields that should be unicode
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73 unicode_fields = ('name', 'asciiname')
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74
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75 def cast_row(row, types=types):
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76 """
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77 cast an iterable `row` of data to
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78 a `dict` according to `types` casting rule
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79 """
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80
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81 if len(row) != len(types):
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82 raise AssertionError("Length of row {} != length of types {}: {}".format(len(row), len(types), row))
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83
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84 retval = {}
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85 for value, (key, _type) in zip(row, types.items()):
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86 try:
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87 retval[key] = _type(value)
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88 except ValueError as e:
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89 # Allow exceptions as elevation isn't always recorded
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90 # TODO make this configurable
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91 if not value and key in ('elevation',):
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92 retval[key] = None
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93 else:
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94 raise
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95 if key in unicode_fields:
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96 retval[key] = retval[key].decode('utf-8')
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97 return retval