Module: Utilities::Geo

Defined in:
lib/utilities/geo.rb

Overview

Special general routines for Geo-specific itams

Defined Under Namespace

Classes: CoordinatesFromLabel

Constant Summary collapse

DICTIONARY =

!! A series of values that are used to unify geographic name strings *for display* (e.g. generating print). These ultimately all belong somewhere else, and are arbitrary decisions made by TaxonWorks collaborators.

{
  'United States of America' => 'United States',
}.freeze
SPECIAL_LATLONG_SYMBOLS =

To add a new (discovered) symbol:

1) To find the Unicode string for any character, use Utilities::Geo.uni_string('c') (remove the first '\').
2) Add the Unicode string (i.e, "\uNNNN") to SPECIAL_LATLONG_SYMBOLS (below), selecting either degrees
    (starting with 'do*'), or tickmarks (starting at "'").
3) Add the Unicode to the proper section in the regexp in the corresponding section (degrees, minutes, or seconds).
    NB: all the minutes symbols are duplicated in the seconds section because sometimes two successive tickmarks
        (for minutes) are used for seconds.

degree symbols, in addition to 'd', 'o', and '*'
\u00b0  "°"  \u00ba  "º"  \u02da  "˚"  \u030a  "?"  \u221e "∞"  \u222b "∫"

tick symbols, in addition to "'" ("\u0027""), and '"' ("\u0022")
\u00a5  "¥"  \u00b4  "´"
\u02B9  "ʹ"  \u02BA  "ʺ"  \u02BB  "ʻ"  \u02BC  "ʼ"  \u02CA "ˊ"
\u02EE  "ˮ"  \u2032  "′"  \u2033  "″"
\u2019  "’"  \u201D  "”"    added June 2020

Significant figures/digits: any of the digits of a number beginning with the digit farthest to the left
that is not zero and ending with the last digit farthest to the right that is either not zero
or that is a zero but is considered to be exact

"do*\u00b0\u00ba\u02DA\u030a\u221e\u222b\u0027\u00b4\u02B9\u02BA\u02BB\u02BC\u02CA\u02EE\u2032\u2033\u0022\u2019\u201D".freeze
LAT_LON_REGEXP = 
Regexp.new(/(?<lat>-?\d+\.?\d*),?\s*(?<long>-?\d+\.?\d*)/)
ONE_WEST =

EARTH_RADIUS = 6371000 # km, 3959 miles (mean Earth radius) # Not used? RADIANS_PER_DEGREE = ::Math::PI/180.0 DEGREES_PER_RADIAN = 180.0/::Math::PI

111_319.490779206
ONE_WEST_MEAN =

meters/degree

111_319.444444444
ONE_NORTH =

meters/degree (calculated mean)

110_574.38855796
REGEXP_COORD =

‘ = u0027, converted so that the regex can be used for SQL Added Unicode right single (u2019) and double (u201D) quote as minutes seconds

{
  # tt1: /\D?(?<lat>\d+\.\d+\s*(?<ca>[NS])*)\s(?<long>\d+\.\d+\s*(?<co>[EW])*)/i,
  dd1a: {
    reg: /(?<lat>\d+\.\d+\s*[NS])\s*(?<long>\d+\.\d+\s*[EW])/i,
    hlp: 'decimal degrees, trailing ordinal, e.g. 23.23N  44.44W'
  },

  dd1b: {
    reg: /(?<lat>[NS]\s*\d+\.\d+)\s*(?<long>[EW]\s*\d+\.\d+)/i,
    hlp: 'decimal degrees, leading ordinal, e.g. N23.23  W44.44'
  },

  dd2:  {
    reg: /(?<lat>\d+[\. ]\d+\u0027?\s*[NS]),?\s*(?<long>\d+[\. ]\d+\u0027?\s*[EW])/i,
    hlp: "decimal degrees, trailing ordinal, e.g. 43.836' N, 89.258' W"
  },

  dm1:  {
    reg: /(?<lat>\d+\s*[\*°o\u02DA ](\d+[\.,]\d+|\d+)\s*[ ´\u0027\u02B9\u02BC\u02CA\u2019]?\s*[NS])[\.,;]?\s*(?<long>\d+\s*[\*°ºo\u02DA ](\d+[\.,]\d+|\d+)\s*[ ´\u0027\u02B9\u02BC\u02CA\u2019]?\s*[WE])/i,
    hlp: "degrees, decimal minutes, trailing ordinal, e.g. 45 54.2'N, 78 43.5'E"
  },

  dms2: {
    reg: /(?<lat>[NS]\.?\s*\d+\s*[\*°ºo\u02DA ]\s*\d+\s*[ ´\u0027\u02B9\u02BC\u02CA\u2019]\s*(\d+[\.,]\d+|\d+)\s*[ "´\u02BA\u02EE\u0027\u02B9\u02BC\u02CA\u201D][´\u0027\u02B9\u02BC\u02CA]?)[\.,;]?\s*(?<long>[WE]\.?\s*\d+\s*[\*°ºo\u02DA ]\s*\d+\s*[ \u0027´\u02B9\u02BC\u02CA\u2019]\s*(\d+[\.,]\d+|\d+)\s*[ "´\u02BA\u02EE\u0027\u02B9\u02BC\u02CA\u201D]?[´\u0027\u02B9\u02BC\u02CA]?)/i,
    hlp: "degrees, minutes, decimal seconds, leading ordinal, e.g. S42°5'18.1\" W88º11'43.3\""
  },

  dm3:  {
    reg: /(?<lat>[NS]\.?\s*\d+\s*[\*°ºo\u02DA ]\s*(\d+[\.,]\d+|\d+)\s*([ ´\u0027\u02B9\u02BC\u02CA\u2019]))[\.,;]?\s*(?<long>[WE]\.?\s*\d+\s*[\*°ºo\u02DA ]\s*(\d+[\.,]\d+|\d+)\s*[ ´\u0027\u02B9\u02BC\u02CA\u2019]?)/i,
    hlp: "degrees, decimal minutes, leading ordinal, e.g. S42º5.18' W88°11.43'"
  },

  dms4: {
    reg: /(?<lat>\d+\s*[\*°ºo\u02DA ]\s*(\d+[\.,]\d+|\d+)\s*[ ´\u0027\u02B9\u02BC\u02CA\u2019]?\s*(\d+[\.,]\d+|\d+)["\u201D]?\s*[NS])\s*(?<long>\d+\s*[\*°ºo\u02DA ]\s*(\d+[\.,]\d+|\d+)\s*[ ´\u0027\u02B9\u02BC\u02CA\u2019]?\s*(\d+[\.,]\d+|\d+)+["\u201D]?\s*[EW])/i,
    hlp: "degrees, minutes, decimal seconds, trailing ordinal, e.g. 24º7'2.0\"S65º24'13.1\"W"
  },

  dd5:  {
    reg: /(?<lat>[NS]\.?\s*(\d+[\.,]\d+|\d+)\s*[\*°ºo\u02DA ])[\.,;]?\s*(?<long>([WE])\.?\s*(\d+[\.,]\d+|\d+)\s*[\*°ºo\u02DA ]?)/i,
    hlp: 'decimal degrees, leading ordinal, e.g. S42.18° W88.34°'
  },

  dd6:  {
    reg: /(?<lat>(\d+[\.,]\d+|\d+)\s*[\*°ºo\u02DA ]\s*[NS])[\.,;]?\s*(?<long>(\d+[\.|,]\d+|\d+)\s*[\*°ºo\u02DA ]\s*[WE])/i,
    hlp: 'decimal degrees, trailing ordinal, e.g. 42.18°S 88.43°W'
  },

  dd7:  {
    reg: /\[(?<lat>-?\d+[\.,]\d+|\-?d+),.*?(?<long>-?\d+[\.,]\d+|\-?d+)\]/i,
    hlp: 'decimal degrees, no ordinal, specific format, e.g. [12.263, -49.398]'
  }
}.freeze

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.conform_significant(number, sig_digits) ⇒ String

conform number to significant digits as string

Parameters:

  • number (String) —

    to be conformed

  • sig_digits (Integer) —

    (desired number of significant digits)

Returns:

  • (String) —

    number limited to specified significant digits



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# File 'lib/utilities/geo.rb', line 569

def self.conform_significant(number, sig_digits)
  input = significant_digits(number.to_s)
  input_string = input[0]
  intg = input[2]
  decimal_point = input[3]
  decimal_position = input_string.index('.')
  decimal_point_zeros = input[4]   # decimal_point_zeros length > 0 implies mantissa only case
  mantissa = input[5]     # mantissa complete iff no decimal_point_zeros
  digit_string = intg + decimal_point_zeros + mantissa
  reduction = input[1] - sig_digits
  result = digit_string   # failsafe result
  if reduction > 0    # need to reduce significant digits
    result = ''
    for index in (0...sig_digits)       # collect ONLY significant digits
      digit = digit_string[index]   # if number is "0", digit is nil
      result += digit
      next
    end
    if digit_string.length > sig_digits     # clean up integer least significant digits
      if sig_digits > 0     # test degenerate case of 0 input
        if digit_string[index + 1].to_i >= 5
          result = (result.to_i + 1).to_s # round if necessary
        end
      end
      for ndex in (0...(intg.length - sig_digits))
        result += '0'
        next
      end
    end
  else        # no reduction or add digits
    for ndex in (0...(sig_digits - digit_string.length))
      result += '0'
      next
    end
  end
  unless decimal_position.nil?
    # this devolves to if decimal_position = 0, prepend "0."   OR
    # if decimal_position == end of string, don't add decimal_point
    # otherwise add decimal_point at decimal_position
    if result.length <= sig_digits
      if decimal_position == 0
        result.insert(decimal_position, '0' + decimal_point)  # make a valid Ruby number
      else
        if decimal_position < sig_digits
          result.insert(decimal_position, decimal_point)
        end
      end
    end
  end
  result
end

.coordinates_regex_from_verbatim_label(text) ⇒ Hash

coordinates from the label parsed to elements

Returns:

  • (Hash) 


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# File 'lib/utilities/geo.rb', line 625

def self.coordinates_regex_from_verbatim_label(text)
  return nil if text.blank?
  text = text.gsub("''", '"')
    .gsub('´´', '"')
    .gsub('ʹʹ', '"')
    .gsub('ʼʼ', '"')
    .gsub('ˊˊ', '"')
    .squish
  text = ' ' + text + ' '

  coordinates = {}

  #  pattern: 42°5'18.1"S88°11'43.3"W
  if matchdata1 = text.match(/\D(\d+) ?[\*°ººod˚ ] ?(\d+) ?[ '´ʹ΄′ʼ’ˊ‘] ?(\d+[\.|,]\d+|\d+) ?[ "ʺ″”ˮ'´ʹ′΄ʼ’ˊ‘]['´ʹ′΄ʼ’ˊ‘]? ?([nN]|[sS])[\.,–;]? ?(\d+) ?[\*°ººod˚ ] ?(\d+) ?[ '´ʹ′΄ʼ’ˊ‘]\ ?(\d+[\.|,]\d+|\d+) ?[ "ʺ″”ˮ'´ʹ′΄ʼ’ˊ‘]['´ʹ′΄ʼ’ˊ‘]? ?([wW]|[eE])\W/)
    coordinates[:lat_deg] = matchdata1[1]
    coordinates[:lat_min] = matchdata1[2]
    coordinates[:lat_sec] = matchdata1[3]
    coordinates[:lat_ns]  = matchdata1[4]
    coordinates[:long_deg] = matchdata1[5]
    coordinates[:long_min] = matchdata1[6]
    coordinates[:long_sec] = matchdata1[7]
    coordinates[:long_we]  = matchdata1[8]
    # pattern: S42°5'18.1"W88°11'43.3"
  elsif matchdata2 = text.match(/\W([nN]|[sS])\.? ?(\d+) ?[\*°ººod˚ ] ?(\d+) ?[ '´ʹ′΄ʼ’ˊ‘] ?(\d+[\.|,]\d+|\d+) ?[ "ʺ″”ˮ'´ʹ′΄ʼ’ˊ‘]['´ʹ′΄ʼ’ˊ‘]?[\.,–;]? ?([wW]|[eE])\.? ?(\d+) ?[\*°ººod˚ ] ?(\d+) ?[ '´ʹ′΄ʼ’ˊ‘] ?(\d+[\.|,]\d+|\d+) ?[ "ʺ″”ˮ'´ʹ′΄ʼ’ˊ‘]?['´ʹ′΄ʼ’ˊ‘]?\D/)
    coordinates[:lat_deg] = matchdata2[2]
    coordinates[:lat_min] = matchdata2[3]
    coordinates[:lat_sec] = matchdata2[4]
    coordinates[:lat_ns]  = matchdata2[1]
    coordinates[:long_deg] = matchdata2[6]
    coordinates[:long_min] = matchdata2[7]
    coordinates[:long_sec] = matchdata2[8]
    coordinates[:long_we]  = matchdata2[5]
    # pattern: S42°5.18'W88°11.43'
  elsif matchdata3 = text.match(/\W([nN]|[sS])\.? ?(\d+) ?[\*°ººod˚ ] ?(\d+[\.|,]\d+|\d+) ?[ '´ʹ′΄ʼ’ˊ‘][\.,;]? ?([wW]|[eE])\.? ?(\d+) ?[\*°ººod˚ ] ?(\d+[\.|,]\d+|\d+) ?[ '´ʹ′΄ʼ’ˊ‘]?\D/)
    coordinates[:lat_deg] = matchdata3[2]
    coordinates[:lat_min] = matchdata3[3]
    coordinates[:lat_ns]  = matchdata3[1]
    coordinates[:long_deg] = matchdata3[5]
    coordinates[:long_min] = matchdata3[6]
    coordinates[:long_we]  = matchdata3[4]
    # pattern: 42°5.18'S88°11.43'W
  elsif matchdata4 = text.match(/\D(\d+) ?[\*°ººod˚ ] ?(\d+[\.|,]\d+|\d+) ?[ '´ʹ′΄ʼ’ˊ‘]? ?([nN]|[sS])[\.,;]? ?(\d+) ?[\*°ººod˚ ] ?(\d+[\.|,]\d+|\d+) ?[ '´ʹ′΄ʼ’ˊ‘]? ?([wW]|[eE])\W/)
    coordinates[:lat_deg] = matchdata4[1]
    coordinates[:lat_min] = matchdata4[2]
    coordinates[:lat_ns]  = matchdata4[3]
    coordinates[:long_deg] = matchdata4[4]
    coordinates[:long_min] = matchdata4[5]
    coordinates[:long_we]  = matchdata4[6]
    # pattern: 42.18°S88.43°W
  elsif matchdata6 = text.match(/\D(\d+[\.|,]\d+|\d+) ?[\*°ººod˚ ] ?([nN]|[sS])[\.,;]? ?(\d+[\.|,]\d+|\d+) ?[\*°ººod˚ ] ?([wW]|[eE])\W/)
    coordinates[:lat_deg] = matchdata6[1]
    coordinates[:lat_ns]  = matchdata6[2]
    coordinates[:long_deg] = matchdata6[3]
    coordinates[:long_we]  = matchdata6[4]
    # pattern: S42.18°W88.34°
  elsif matchdata5 = text.match(/\W([nN]|[sS])\.? ?(\d+[\.|,]\d+|\d+) ?[\*°ººod˚ ][\.,;]? ?([wW]|[eE])\.? ?(\d+[\.|,]\d+|\d+) ?[\*°ººod˚ ]?\D/)
    coordinates[:lat_deg] = matchdata5[2]
    coordinates[:lat_ns]  = matchdata5[1]
    coordinates[:long_deg] = matchdata5[4]
    coordinates[:long_we]  = matchdata5[3]
    # pattern: -12.263, 49.398
  elsif matchdata7 = text.match(/\D(-?\d+[\.|,]\d+|\-?\d+),.*?(-?\d+[\.|,]\d+|\-?\d+)\D/)
    coordinates[:lat_deg] = matchdata7[1]
    coordinates[:long_deg] = matchdata7[2]
  end
  coordinates[:lat_deg] = coordinates[:lat_deg].gsub(',', '.') if coordinates[:lat_deg]
  coordinates[:lat_min] = coordinates[:lat_min].gsub(',', '.') if coordinates[:lat_min]
  coordinates[:lat_sec] = coordinates[:lat_sec].gsub(',', '.') if coordinates[:lat_sec]
  coordinates[:lat_ns] = coordinates[:lat_ns].capitalize if coordinates[:lat_ns]
  coordinates[:long_deg] = coordinates[:long_deg].gsub(',', '.') if coordinates[:long_deg]
  coordinates[:long_min] = coordinates[:long_min].gsub(',', '.') if coordinates[:long_min]
  coordinates[:long_sec] = coordinates[:long_sec].gsub(',', '.') if coordinates[:long_sec]
  coordinates[:lat_we] = coordinates[:lat_we].capitalize if coordinates[:lat_we]

  return {} if !coordinates[:lat_deg] || !coordinates[:long_deg]
  return {} if coordinates[:lat_deg].to_f > 90 || coordinates[:lat_deg].to_f < -90
  return {} if coordinates[:lat_min].to_f >= 60
  return {} if coordinates[:lat_sec].to_f >= 60
  return {} if coordinates[:long_deg].to_f > 180 || coordinates[:long_deg].to_f < -180
  return {} if coordinates[:long_min].to_f >= 60
  return {} if coordinates[:long_sec].to_f >= 60


  if coordinates[:lat_ns].nil?
    lat_string = coordinates[:lat_deg]
    if coordinates[:lat_deg].to_f < 0 # -5° S; 5° N
      coordinates[:lat_ns] = 'S'
      coordinates[:lat_deg] = coordinates[:lat_deg].gsub('-', '')
    else
      coordinates[:lat_ns] = 'N' # -5° W; 5° E
    end
  else
    lat_string = coordinates[:lat_deg] + '°'
    lat_string += coordinates[:lat_min] + "'" if coordinates[:lat_min]
    lat_string += coordinates[:lat_sec] + '"' if coordinates[:lat_sec]
    lat_string += coordinates[:lat_ns]
  end
  if coordinates[:long_we].nil?
    long_string = coordinates[:long_deg]
    if coordinates[:long_deg].to_f < 0
      coordinates[:long_we] = 'W'
      coordinates[:long_deg] = coordinates[:long_deg].gsub('-', '')
    else
      coordinates[:long_we] = 'E'
    end
  else
    long_string = coordinates[:long_deg] + '°'
    long_string += coordinates[:long_min] + "'" if coordinates[:long_min]
    long_string += coordinates[:long_sec] + '"' if coordinates[:long_sec]
    long_string += coordinates[:long_we]
  end

  lat_dec = (coordinates[:lat_deg].to_f + (coordinates[:lat_min].to_f / 60) + (coordinates[:lat_sec].to_f / 3600)).round(6).to_s
  lat_dec = '-' + lat_dec if coordinates[:lat_ns] == 'S'
  long_dec = (coordinates[:long_deg].to_f + (coordinates[:long_min].to_f / 60) + (coordinates[:long_sec].to_f / 3600)).round(6).to_s
  long_dec = '-' + long_dec if coordinates[:long_we] == 'W'

  c = {
    verbatim: {verbatim_latitude: lat_string, verbatim_longitude: long_string},
    decimal: {decimal_latitude: lat_dec, decimal_longitude: long_dec},
    parsed: coordinates
  }
  return c
end

.degrees_minutes_seconds_to_decimal_degrees(dms_in) ⇒ Float

rubocop:disable Metrics/MethodLength 42∞5’18.1“S88∞11’43.3”W S42∞5’18.1“W88∞11’43.3” S42∞5.18’W88∞11.43’ 42∞5.18’S88∞11.43’W S42.18∞W88.34∞42.18∞S88.43∞W -12.263, 49.398

42:5:18.1N 88:11:43.3W

no limit test, unless there is a ordinal letter included

Parameters:

  • dms_in (String)

Returns:

  • (Float) —

    decimal degrees



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# File 'lib/utilities/geo.rb', line 332

def self.degrees_minutes_seconds_to_decimal_degrees(dms_in) # rubocop:disable Metrics/PerceivedComplexity !! But this is too complex :)
  match_string = nil
  # no_point     = false
  degrees      = 0.0
  minutes      = 0.0
  seconds      = 0.0

  # make SURE it is a string! Watch out for dms_in == -10
  dms_in       = dms_in.to_s
  dms          = dms_in.dup.upcase
  dms          = dms.gsub('DEG', 'º').gsub('DG', 'º')
  dms =~ /[NSEW]/i
  ordinal = $LAST_MATCH_INFO.to_s
  # return "#{dms}: Too many letters (#{ordinal})" if ordinal.length > 1
  # return nil if ordinal.length > 1
  dms     = dms.gsub!(ordinal, '').strip.downcase

  if dms.include? '.'
    no_point = false
    if dms.include? ':' # might be '42:5.1'
      /(?<degrees>-*\d+):(?<minutes>\d+\.*\d*)(:(?<seconds>\d+\.*\d*))*/ =~ dms
      match_string = $& # rubocop:disable Style/IdenticalConditionalBranches
    else
      # this will get over-ridden if the next regex matches
      /(?<degrees>-*\d+\.\d+)/ =~ dms
      match_string = $& # rubocop:disable Style/IdenticalConditionalBranches
    end
  else
    no_point = true
  end

  # >40°26′46″< >40°26′46″<
  dms.each_char {|c|
    next unless SPECIAL_LATLONG_SYMBOLS.include?(c)
    /^(?<degrees>-*\d{0,3}(\.\d+)*) # + or - three-digit number with optional '.' and additional decimal digits
    [do*\u00b0\u00ba\u02DA\u030a\u221e\u222b\uc2ba]*\s* # optional special degrees symbol, optional space
    (?<minutes>\d+\.*\d*)* # optional number, integer or floating-point
    ['\u00a5\u00b4\u02b9\u02bb\u02bc\u02ca\u2032\uc2ba\u2019]*\s* # optional special minutes symbol, optional space
    ((?<seconds>\d+\.*\d*) # optional number, integer or floating-point
    ['\u00a5\u00b4\u02b9\u02ba\u02bb\u02bc\u02ca\u02ee\u2032\u2033\uc2ba"\u201D]+)* # optional special seconds symbol, optional space
    /x =~ dms # '/(regexp)/x' modifier permits inline comments for regexp
    match_string = $&
      break # bail on the first character match
  }
  degrees = dms.to_f if match_string.nil? && no_point

  # @match_string = $&
  degrees = degrees.to_f
  case ordinal
  when 'W', 'S'
    sign = -1.0
  else
    sign = 1.0
  end
  if degrees < 0
    sign    *= -1
    degrees *= -1.0
  end
  frac = ((minutes.to_f * 60.0) + seconds.to_f) / 3600.0
  dd   = (degrees + frac) * sign
  case ordinal
  when 'N', 'S'
    limit = 90.0
  else
    limit = 180.0
  end
  # return "#{dms}: Out of range (#{dd})" if dd.abs > limit
  return nil if dd.abs > limit || dd == 0.0
  dd.round(6).to_s
end

.distance_in_meters(dist_in) ⇒ String

12345 (presume meters) 123.45 123 ft > 123 ft. > 123 feet > 1 foot > 123 f > 123 f. 123 m > 123 meters > 123 m. 123 km > 123 km. > 123 kilometers 123 mi > 123 milee > 123 miles

Parameters:

  • dist_in (String)

Returns:

  • (String) —

    # ##### changed from previous type



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# File 'lib/utilities/geo.rb', line 117

def self.distance_in_meters(dist_in)
  dist_in   = '0.0 meters' if dist_in.blank?
  elevation = dist_in.strip.downcase
  pieces    = elevation.split(' ')
  # value     = elevation.to_f
  if pieces.count > 1 # two pieces, second is distance unit
    piece = 1
  else # one piece, may contain distance unit.
    piece = 0
  end
  value = pieces[0]
  scale = 1 # default is meters

  /(?<ft>f[oe]*[t]*\.*)|(?<m>[^k]m(eters)*[\.]*)|(?<km>kilometer(s)*|k[m]*[\.]*)|(?<mi>mi(le(s)*)*)/ =~ pieces[piece]
  # scale = $&

  scale = 1 if m.present?    # previously 1.0
  scale = 0.3048 if ft.present?
  scale = 1000 if km.present? # previously 1000.0
  scale = 1_609.344 if mi.present?

  value_sig = significant_digits(value.to_s)
  if value_sig[0].include?('.')
    s_value = value_sig[0].to_f
  else
    s_value = value_sig[0].to_i
  end
  s_sig = value_sig[1]

  distance = s_value * scale
  distance = conform_significant(distance.to_s, s_sig)  ####### previously .to_f
  distance
end

.error_box_for_point(geo_object, error_radius) ⇒ RGeo::Polygon

confirm that this says that the error radius is one degree or smaller

Parameters:

  • geo_object (RGeo::Point)
  • error_radius (Integer)

Returns:

  • (RGeo::Polygon) 


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# File 'lib/utilities/geo.rb', line 461

def self.error_box_for_point(geo_object, error_radius)
  # this limits the actual error_box to 10k FOR THIS TEST ONLY!
  error_radius = 10_000 if error_radius > 10_000
  # ensure radius is not too close to zero to avoid creating invalid box
  error_radius = [error_radius, 2.0**-16].max

  p0      = geo_object
  delta_x = (error_radius / ONE_WEST) / Math.cos(p0.y * Math::PI / 180)
  delta_y = error_radius / ONE_NORTH

  Gis::FACTORY.polygon(
    Gis::FACTORY.line_string(
      [
        Gis::FACTORY.point(p0.x - delta_x, p0.y + delta_y), # northwest
        Gis::FACTORY.point(p0.x + delta_x, p0.y + delta_y), # northeast
        Gis::FACTORY.point(p0.x + delta_x, p0.y - delta_y), # southeast
        Gis::FACTORY.point(p0.x - delta_x, p0.y - delta_y) # southwest
      ]
    )
  )
end

.hunt_lat_long(label, how = ' ') ⇒ Hash

rubocop:disable Metrics/MethodLength, Metrics/BlockNesting

Parameters:

  • label (String)
  • how (String) (defaults to: ' ')

Returns:

  • (Hash) —

    of possible lat/long pairs



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# File 'lib/utilities/geo.rb', line 253

def self.hunt_lat_long(label, how = ' ')
  if how.nil?
    pieces = [label]
  else
    pieces = label.split(how)
  end
  lat_long = {}
  pieces.each do |piece|
    # group of possible regex configurations
    # m = /(?<lat>\d+\.\d+\s*(?<ca>[NS])*)\s(?<long>\d+\.\d+\s*(?<co>[EW])*)/i =~ piece
    m = REGEXP_COORD[:dd1a][:reg].match(piece)
    if m.nil?
      piece.each_char do |c|
        next unless SPECIAL_LATLONG_SYMBOLS.include?(c)
        test = Utilities::Geo.degrees_minutes_seconds_to_decimal_degrees(piece)
        unless test.nil?
          if test.to_f.is_a? Numeric
            # might be a lat/long
            lat_long[:piece] = piece
            if lat_long[:lat].nil?
              lat_long[:lat] = piece
            else
              lat_long[:long]  = piece
              lat_long[:piece] = [lat_long[:lat], piece].join(how)
            end
          end
        end
        break
      end
    else
      lat_long[:piece] = m[0]
      lat_long[:lat]   = m[:lat]
      lat_long[:long]  = m[:long]
    end
  end
  lat_long
end

.hunt_lat_long_full(label, filters = REGEXP_COORD.keys) ⇒ Array

Returns of possible coordinate strings.

Parameters:

  • label (String)
  • filters (String) (defaults to: REGEXP_COORD.keys)

Returns:

  • (Array) —

    of possible coordinate strings



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# File 'lib/utilities/geo.rb', line 232

def self.hunt_lat_long_full(label, filters = REGEXP_COORD.keys)
  trials = {}
  filters.each_with_index {|kee, _dex|
    kee_string         = kee.to_s.upcase
    trials[kee_string] = {}
    named              = REGEXP_COORD[kee][:reg].match(label)
    unless named.nil?
      trials[kee_string][:piece] = named[0]
      trials[kee_string][:lat]   = named[:lat]
      trials[kee_string][:long]  = named[:long]
      named
    end
    trials[kee_string][:method] = "text, #{kee_string}"
  }
  trials
end

.hunt_wrapper(label, filters = REGEXP_COORD.keys) ⇒ Array

Parameters:

  • label (String)
  • filters (Array) (defaults to: REGEXP_COORD.keys)

Returns:

  • (Array) 


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# File 'lib/utilities/geo.rb', line 295

def self.hunt_wrapper(label, filters = REGEXP_COORD.keys)

  trials = self.hunt_lat_long_full(label, filters)

  ';, '.each_char {|sep|
    trial = self.hunt_lat_long(label, sep)
    found = "#{trial[:piece]}"
    unless trial[:lat].nil? and !trial[:long].nil?
      _found = "(#{sep})" if found.blank?
    end
    trials["(#{sep})"] = trial.merge!(method: "(#{sep})")
  }
  trials
end

.is_lat_long_special(c) ⇒ Boolean

Parameters:

  • c (String) —

    as single character

Returns:

  • (Boolean) 


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# File 'lib/utilities/geo.rb', line 312

def self.is_lat_long_special(c)
  SPECIAL_LATLONG_SYMBOLS.include?(c)
end

.nearby_from_params(params) ⇒ Integer

rubocop:disable Metrics/MethodLength

Parameters:

  • params (ActionController::Parameters)

Returns:

  • (Integer) 


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# File 'lib/utilities/geo.rb', line 415

def self.nearby_from_params(params)
  nearby_distance = params['nearby_distance'].to_i
  nearby_distance = CollectingEvent::NEARBY_DISTANCE if nearby_distance == 0

  decade = case nearby_distance.to_s.length
           when 1..2
             10
           when 3
             100
           when 4
             1_000
           when 5
             10_000
           when 6
             100_000
           when 7
             1_000_000
           when 8
             10_000_000
           else
             10
           end
  digit  = (nearby_distance.to_f / decade.to_f).round

  case digit
  when 0..1
    digit = 1
  when 2
    digit = 2
  when 3..5
    digit = 5
  when 6..10
    decade *= 10
    digit = 1
  end

  params['digit1'] = digit.to_s
  params['digit2'] = decade.to_s
  digit * decade
end

.significant_digits(number_string) ⇒ Array

determine number of significant digits in string input argument

Parameters:

  • number_string (String)

Returns:

  • (Array) —
    <string with only significant digits>, count, <left of decimal>, decimal point string, <right of decimal lead zeros string>, <mantissa string> 


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# File 'lib/utilities/geo.rb', line 505

def self.significant_digits(number_string)
  # is there a decimal point?
  intg = ''
  decimal_point_zeros = ''
  mantissa = ''
  decimal_lead_zeros = 0
  decimal_point = ''
  /(?<num>([0-9]*)(\.?)([0-9]*))/ =~ number_string
  if num.nil?
    raise
  end
  dp = num.index('.')
  if dp.nil?
    intg = num
    intgl = intg.sub(/^[0]+/,'')  # strip lead zeros
    if intgl.nil?
      intg = num
    end
    intgt = intg.sub(/0+$/, '')    # strip trailing zeros
    if intgt.nil?
      intg = intgl
    end
    # sig = intg.length
  else
    # make sure truly numeric
    decimal_point = '.'
    digits = num.split('.')
    if digits.length > 2
      raise   # or just ignore extra decimal point and beyond?
    else
      if digits[0].length > 0 # left of decimal ?
        intg = digits[0].sub(/^[0]+/,'')
        if intg.nil?
          intg = digits[0]
        end
      else
        intg = ''
      end
      mantissa = digits[1]
      unless digits[1].nil?
        if intg.length > 0  # have full case nn.mm
          sig = intg.length + mantissa.length
        else  # mantissa might have "leading" zeros
          decimal_lead_zeros = digits[1].length
          mantissa = digits[1].sub(/^[0]+/, '')
          if mantissa.nil?
            mantissa = digits[1]
          end
          decimal_lead_zeros = decimal_lead_zeros - mantissa.length
          decimal_point_zeros = decimal_point_zeros.rjust(decimal_lead_zeros, '0')
        end
      else
        mantissa = ''
      end
    end
  end
  sig = intg + decimal_point + decimal_point_zeros + mantissa
  [sig, intg.length + mantissa.length, intg, decimal_point, decimal_point_zeros, mantissa]
end

Instance Method Details

#diamond_error_box ⇒ RGeo::Polygon

make a diamond 2 * radius tall and 2 * radius wide, with the reference point as center NOT TESTED/USED

Returns:

  • (RGeo::Polygon) 


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# File 'lib/utilities/geo.rb', line 486

def diamond_error_box
  p0      = geo_object
  delta_x = (error_radius / ONE_WEST) / Math.cos(p0.y * Math::PI / 180)
  delta_y = error_radius / ONE_NORTH

  retval = Gis::FACTORY.polygon(Gis::FACTORY.line_string(
    [Gis::FACTORY.point(p0.x, p0.y + delta_y), # north
     Gis::FACTORY.point(p0.x + delta_x, p0.y), # east
     Gis::FACTORY.point(p0.x, p0.y - delta_y), # south
     Gis::FACTORY.point(p0.x - delta_x, p0.y) # west
    ]))
  box    = RGeo::Cartesian::BoundingBox.new(Gis::FACTORY)
  box.add(retval)
  box.to_geometry
end

#gps_data ⇒ Nil

TODO: move to /lib

Returns:

  • (Nil) —

    currently handling this client side



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# File 'lib/utilities/geo.rb', line 18

def gps_data
  # if there is EXIF data, pulls out geographic coordinates & returns hash of lat/long in decimal degrees
  # (5 digits after decimal point if available)
  # EXIF gps information is in http://web.archive.org/web/20131018091152/http://exif.org/Exif2-2.PDF section 4.6.6
  # note that cameras follow specifications, but EXIF data can be edited manually and may not follow specifications.

  # check if gps data is in d m s (could be edited manually)
  #   => format dd/1,mm/1,ss/1 or dd/1,mmmm/100,0/1 or 40/1, 5/1, 314437/10000
  # N = +
  # S = -
  # E = +
  # W = -
  # Altitude should be based on reference of sea level
  # GPSAltitudeRef is 0 for above sea level, and 1 for below sea level

  # From discussion with Jim -
  # create a utility library called "GeoConvert" and define single method
  # that will convert from degrees min sec to decimal degree
  # - maybe 2 versions? - one returns string, other decimal?
end

#uni_string(char) ⇒ String

Parameters:

  • char (String) —

    as single character

Returns:

  • (String) 


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# File 'lib/utilities/geo.rb', line 406

def uni_string(char)
  format('\\u%04X', char.ord)
  # "\\#{sprintf('u%04X', char.ord)}"
  # '\\u%04X' % [char.ord]
end