Package pygeodesy :: Module dms |
[frames] | no frames]

# Module dms

Functions to parse and format bearing, compass, lat- and longitudes in various forms of degrees, minutes and seconds.

After (C) Chris Veness 2011-2015 published under the same MIT Licence**, see Latitude/Longitude and Vector-based geodesy.

Version: 20.11.04

Classes
| ParseError Error parsing degrees, radians or several other formats.

Functions
bearingDMS(bearing, form=`'``d``'`, prec=None, sep='') Convert bearing to a string. |
clipDegrees(deg, limit) Clip a lat- or longitude to the given range. |
clipRadians(rad, limit) Clip a lat- or longitude to the given range. |
compassDMS(bearing, form=`'``d``'`, prec=None, sep='') Convert bearing to a string suffixed with compass point. |
compassPoint(bearing, prec=3) Convert bearing to a compass point. |
degDMS(deg, prec=6, s_D=`'``°``'`, s_M=`'``\xe2\x80\xb2``'`, s_S=`'``″``'`, neg='-', pos='') Convert degrees to a string in degrees, minutes or seconds. |
latDMS(deg, form=`'``dms``'`, prec=2, sep='') Convert latitude to a string, optionally suffixed with N or S. |
latlonDMS(lls, form=`'``dms``'`, prec=None, sep=None) Convert one or more `LatLon` instances to strings. |
lonDMS(deg, form=`'``dms``'`, prec=2, sep='') Convert longitude to a string, optionally suffixed with E or W. |
normDMS(strDMS, norm='') Normalize all degree ˚, minute ' and second " symbols in a string to the default symbols %s, %s and %s. |
parseDDDMMSS(strDDDMMSS, suffix=`'``NSEW``'`, sep='', clip=0) Parse a lat- or longitude represention form [D]DDMMSS in degrees. |
parseDMS(strDMS, suffix=`'``NSEW``'`, sep='', clip=0) Parse a lat- or longitude representation `"lat, lon"` in `degrees`. |
parseDMS2(strLat, strLon, sep='', clipLat=90, clipLon=180) Parse a lat- and a longitude representions in `degrees`. |
parse3llh(strllh, height=0, sep=',', clipLat=90, clipLon=180) Parse a string `"lat lon [h]"` representing lat-, longitude in `degrees` and optional height in `meter`. |
parseRad(strRad, suffix=`'``NSEW``'`, clip=0) Parse a string representing angle in `radians`. |
precision(form, prec=None) Set the default precison for a given F_ form. |
toDMS(deg, form=`'``dms``'`, prec=2, sep='', ddd=2, neg='-', pos='') Convert signed `degrees` to string, without suffix. |

Variables
| __all__ = `_ALL_LAZY.dms`
| F_D = ``'``d``'``
| F_DM = ``'``dm``'``
| F_DMS = ``'``dms``'``
| F_DEG = ``'``deg``'``
| F_MIN = ``'``min``'``
| F_SEC = ``'``sec``'``
| F__E = ``'``e``'``
| F__F = ``'``f``'``
| F__G = ``'``g``'``
| F_RAD = ``'``rad``'``
| F_D_ = ``'``-d``'``
| F_DM_ = ``'``-dm``'``
| F_DMS_ = ``'``-dms``'``
| F_DEG_ = ``'``-deg``'``
| F_MIN_ = ``'``-min``'``
| F_SEC_ = ``'``-sec``'``
| F__E_ = ``'``-e``'``
| F__F_ = ``'``-f``'``
| F__G_ = ``'``-g``'``
| F_RAD_ = ``'``-rad``'``
| F_D__ = ``'``+d``'``
| F_DM__ = ``'``+dm``'``
| F_DMS__ = ``'``+dms``'``
| F_DEG__ = ``'``+deg``'``
| F_MIN__ = ``'``+min``'``
| F_SEC__ = ``'``+sec``'``
| F__E__ = ``'``+e``'``
| F__F__ = ``'``+f``'``
| F__G__ = ``'``+g``'``
| F_RAD__ = ``'``+rad``'``
| S_DEG = ``'``°``'``
| S_MIN = ``'``\xe2\x80\xb2``'``
| S_SEC = ``'``″``'``
| S_RAD = `''`
| S_SEP = `''`

Function Details

### bearingDMS (bearing, form=`'``d``'`, prec=None, sep='') |
Convert bearing to a string. Arguments: `bearing` - Bearing from North (compass `degrees360`). `form` - Optional `bearing` format (`str` or F_D, F_DM, F_DMS, F_DEG, F_MIN, F_SEC, F__E, F__F, F__G, F_RAD, F_D_, F_DM_, F_DMS_, F_DEG_, F_MIN_, F_SEC_, F__E_, F__F_, F__G_, F_RAD_, F_D__, F_DM__, F_DMS__, F_DEG__, F_MIN__, F_SEC__, F__E__, F__F__, F__G__ or F_RAD__). `prec` - Optional number of decimal digits (0..9 or `None` for default). Trailing zero decimals are stripped for `prec` values of 1 and above, but kept for negative `prec`. `sep` - Optional separator (`str`). Returns: Compass degrees per the specified `form` (`str`). JS name: toBrng.

### clipDegrees (deg, limit) |
Clip a lat- or longitude to the given range. Arguments: `deg` - Unclipped lat- or longitude (`degrees`). `limit` - Valid `-limit..+limit` range (`degrees`). Returns: Clipped value (`degrees`). Raises: `RangeError` - If `abs(deg)` beyond `limit` and rangerrors set to `True`.

### clipRadians (rad, limit) |
Clip a lat- or longitude to the given range. Arguments: `rad` - Unclipped lat- or longitude (`radians`). `limit` - Valid `-limit..+limit` range (`radians`). Returns: Clipped value (`radians`). Raises: `RangeError` - If `abs(rad)` beyond `limit` and rangerrors set to `True`.

### compassDMS (bearing, form=`'``d``'`, prec=None, sep='') |
Convert bearing to a string suffixed with compass point. Arguments: `bearing` - Bearing from North (compass `degrees360`). `form` - Optional `bearing` format (`str` or F_D, F_DM, F_DMS, F_DEG, F_MIN, F_SEC, F__E, F__F, F__G, F_RAD, F_D_, F_DM_, F_DMS_, F_DEG_, F_MIN_, F_SEC_, F__E_, F__F_, F__G_, F_RAD_, F_D__, F_DM__, F_DMS__, F_DEG__, F_MIN__, F_SEC__, F__E__, F__F__, F__G__ or F_RAD__). `prec` - Optional number of decimal digits (0..9 or `None` for default). Trailing zero decimals are stripped for `prec` values of 1 and above, but kept for negative `prec`. `sep` - Optional separator (`str`). Returns: Compass degrees and point in the specified form (`str`).

### compassPoint (bearing, prec=3) |
Convert bearing to a compass point. Arguments: `bearing` - Bearing from North (compass `degrees360`). `prec` - Optional precision (1 for cardinal or basic winds, 2 for intercardinal or ordinal or principal winds, 3 for secondary-intercardinal or half-winds or 4 for quarter-winds). Returns: Compass point (1-, 2-, 3- or 4-letter `str`). Raises: `ValueError` - Invalid `prec`. See Also: Dms.compassPoint and Compass rose. Example:
    >>> p = compassPoint(24, 1)  # 'N'
    >>> p = compassPoint(24, 2)  # 'NE'
    >>> p = compassPoint(24, 3)  # 'NNE'
    >>> p = compassPoint(24)     # 'NNE'
    >>> p = compassPoint(11, 4)  # 'NbE'
    >>> p = compassPoint(30, 4)  # 'NEbN'
    >>> p = compassPoint(11.249)  # 'N'
    >>> p = compassPoint(11.25)   # 'NNE'
    >>> p = compassPoint(-11.25)  # 'N'
    >>> p = compassPoint(348.749) # 'NNW'

### degDMS (deg, prec=6, s_D=`'``°``'`, s_M=`'``\xe2\x80\xb2``'`, s_S=`'``″``'`, neg='-', pos='') |
Convert degrees to a string in degrees, minutes or seconds. Arguments: `deg` - Value in degrees (`scalar`). `prec` - Optional number of decimal digits (0..9 or `None` for default). Trailing zero decimals are stripped for `prec` values of 1 and above, but kept for negative `prec`. `s_D` - Symbol for degrees (`str`). `s_M` - Symbol for minutes (`str`) or `""`. `s_S` - Symbol for seconds (`str`) or `""`. `neg` - Optional sign for negative (`'-'`). `pos` - Optional sign for positive (`''`). Returns: Either degrees, minutes or seconds (`str`).

### latDMS (deg, form=`'``dms``'`, prec=2, sep='') |
Convert latitude to a string, optionally suffixed with N or S. Arguments: `deg` - Latitude to be formatted (`degrees`). `form` - Optional `deg` format (`str` or F_D, F_DM, F_DMS, F_DEG, F_MIN, F_SEC, F__E, F__F, F__G, F_D_, F_RAD, F_D_, F_DM_, F_DMS_, F_DEG_, F_MIN_ F_SEC_, F__E_, F__F_, F__G_, F_RAD_, F_D__, F_DM__, F_DMS__, F_DEG__, F_MIN__, F_SEC__, F__E__, F__F__, F__G__ or F_RAD__). `prec` - Optional number of decimal digits (0..9 or `None` for default). Trailing zero decimals are stripped for `prec` values of 1 and above, but kept for negative `prec`. `sep` - Optional separator (`str`). Returns: Degrees in the specified form (`str`). JS name: toLat.

### latlonDMS (lls, form=`'``dms``'`, prec=None, sep=None) |
Convert one or more `LatLon` instances to strings. Arguments: `lls` - Single or a list, sequence, tuple, etc. (`LatLon`s). `form` - Optional `deg` format (`str` or F_D, F_DM, F_DMS, F_DEG, F_MIN, F_SEC, F__E, F__F, F__G, F_RAD, F_D_, F_DM_, F_DMS_, F_DEG_, F_MIN_, F_SEC_, F__E_, F__F_, F__G_, F_RAD_, F_D__, F_DM__, F_DMS__, F_DEG__, F_MIN__, F_SEC__, F__E__, F__F__, F__G__ or F_RAD__). `prec` - Optional number of decimal digits (0..9 or `None` for default). Trailing zero decimals are stripped for `prec` values of 1 and above, but kept for negative `prec`. `sep` - Separator joining `lls` (`str` or `None`). Returns: A `str` or `tuple` of `sep` is `None` or `NN`.

### lonDMS (deg, form=`'``dms``'`, prec=2, sep='') |
Convert longitude to a string, optionally suffixed with E or W. Arguments: `deg` - Longitude to be formatted (`degrees`). `form` - Optional `deg` format (`str` or F_D, F_DM, F_DMS, F_DEG, F_MIN, F_SEC, F__E, F__F, F__G, F_RAD, F_D_, F_DM_, F_DMS_, F_DEG_, F_MIN_, F_SEC_, F__E_, F__F_, F__G_, F_RAD_, F_D__, F_DM__, F_DMS__, F_DEG__, F_MIN__, F_SEC__, F__E__, F__F__, F__G__ or F_RAD__). `prec` - Optional number of decimal digits (0..9 or `None` for default). Trailing zero decimals are stripped for `prec` values of 1 and above, but kept for negative `prec`. `sep` - Optional separator (`str`). Returns: Degrees in the specified form (`str`). JS name: toLon.

### normDMS (strDMS, norm='') |
Normalize all degree ˚, minute ' and second " symbols in a string to the default symbols %s, %s and %s. Arguments: `strDMS` - DMS (`str`). `norm` - Optional replacement symbol, default symbol otherwise (`str`). Returns: Normalized DMS (`str`).

### parseDDDMMSS (strDDDMMSS, suffix=`'``NSEW``'`, sep='', clip=0) |
Parse a lat- or longitude represention form [D]DDMMSS in degrees. Arguments: `strDDDMMSS` - Degrees in any of several forms (`str`) and types (`float`, `int`, other). `suffix` - Optional, valid compass points (`str`, `tuple`). `sep` - Optional separator between "[D]DD", "MM" and "SS" (''). `clip` - Optionally, limit value to -clip..+clip (`degrees`). Returns: Degrees (`float`). Raises: `ParseError` - Invalid `strDDDMMSS` or `clip` or the `strDDDMMSS` form is incompatible with the suffixed or `suffix` compass point. `RangeError` - Value of `strDDDMMSS` outside the valid range and rangerrors set to `True`. Notes: Type `str` values "[D]DD", "[D]DDMM" and "[D]DDMMSS" for `strDDDMMSS` are parsed properly only if either unsigned and suffixed with a valid, compatible, `cardinal` compassPoint or if unsigned or signed, unsuffixed and with keyword argument `suffix` set to 'NS', 'EW' or a compatible compassPoint. Unlike function parseDMS, type `float`, `int` and other non-`str` `strDDDMMSS` values are interpreted form [D]DDMMSS. For example, `int(1230)` is returned as 12.5 and not 1230.0 degrees. However, `int(345)` is considered form "DDD" 345 and not "DDMM" 0345, unless `suffix` specifies compass point 'NS'. See Also: Functions parseDMS, parseDMS2 and parse3llh.

### parseDMS (strDMS, suffix=`'``NSEW``'`, sep='', clip=0) |
Parse a lat- or longitude representation `"lat, lon"` in `degrees`. This is very flexible on formats, allowing signed decimal degrees, degrees and minutes or degrees minutes and seconds optionally suffixed by a cardinal compass point. A variety of symbols, separators and suffixes are accepted, for example "3°37′09″W". Minutes and seconds may be omitted. Arguments: `strDMS` - Degrees in any of several forms (`str`) and types (`float`, `int`, other). `suffix` - Optional, valid compass points (`str`, `tuple`). `sep` - Optional separator between deg°, min′ and sec″ ("''"). `clip` - Optionally, limit value to -clip..+clip (`degrees`). Returns: Degrees (`float`). Raises: `ParseError` - Invalid `strDMS` or `clip`. `RangeError` - Value of `strDMS` outside the valid range and rangerrors set to `True`. Note: Inlike function parseDDDMMSS, type `float`, `int` and other non-`str` `strDMS` values are considered as decimal degrees. For example, `int(1230)` is returned as 1230.0 and not as 12.5 degrees and `float(345)` as 345.0 and not as 3.75 degrees! See Also: Functions parseDDDMMSS, parseDMS2 and parse3llh.

### parseDMS2 (strLat, strLon, sep='', clipLat=90, clipLon=180) |
Parse a lat- and a longitude representions in `degrees`. Arguments: `strLat` - Latitude in any of several forms (`str` or `degrees`). `strLon` - Longitude in any of several forms (`str` or `degrees`). `sep` - Optional separator between deg°, min′ and sec″ (''). `clipLat` - Keep latitude in `-clipLat..+clipLat` range (`degrees`). `clipLon` - Keep longitude in `-clipLon..+clipLon` range (`degrees`). Returns: A LatLon2Tuple`(lat, lon)` in `degrees`. Raises: `ParseError` - Invalid `strLat` or `strLon`. `RangeError` - Value of `strLat` or `strLon` outside the valid range and rangerrors set to `True`. Note: See the Notes at function parseDMS. See Also: Functions parseDDDMMSS, parseDMS and parse3llh.

### parse3llh (strllh, height=0, sep=',', clipLat=90, clipLon=180) |
Parse a string `"lat lon [h]"` representing lat-, longitude in `degrees` and optional height in `meter`. The lat- and longitude value must be separated by a separator character. If height is present it must follow, separated by another separator. The lat- and longitude values may be swapped, provided at least one ends with the proper compass point. Arguments: `strllh` - Latitude, longitude[, height] (`str`, ...). `height` - Optional, default height (`meter`) or `None`. `sep` - Optional separator (`str`). `clipLat` - Keep latitude in `-clipLat..+clipLat` (`degrees`). `clipLon` - Keep longitude in `-clipLon..+clipLon` range (`degrees`). Returns: A LatLon3Tuple`(lat, lon, height)` in `degrees`, `degrees` and `float`. Raises: `RangeError` - Lat- or longitude value of `strllh` outside valid range and rangerrors set to `True`. `ValueError` - Invalid `strllh` or `height`. Note: See the Notes at function parseDMS. See Also: Functions parseDDDMMSS, parseDMS and parseDMS2. Example:
    >>> parse3llh('000°00′05.31″W, 51° 28′ 40.12″ N')
    (51.4778°N, 000.0015°W, 0)

### parseRad (strRad, suffix=`'``NSEW``'`, clip=0) |
Parse a string representing angle in `radians`. Arguments: `strRad` - Degrees in any of several forms (`str` or `radians`). `suffix` - Optional, valid compass points (`str`, `tuple`). `clip` - Optionally, limit value to -clip..+clip (`radians`). Returns: Radians (`float`). Raises: `ParseError` - Invalid `strRad` or `clip`. `RangeError` - Value of `strRad` outside the valid range and rangerrors set to `True`.

### precision (form, prec=None) |
Set the default precison for a given F_ form. Arguments: `form` - F_D, F_DM, F_DMS, F_DEG, F_MIN, F_SEC, F__E, F__F, F__G or F_RAD (`str`). `prec` - Optional number of decimal digits (0..9 or `None` for default). Trailing zero decimals are stripped for `prec` values of 1 and above, but kept for negative `prec`. Returns: Previous precision (`int`). Raises: `ValueError` - Invalid `form` or `prec` or `prec` outside valid range.

### toDMS (deg, form=`'``dms``'`, prec=2, sep='', ddd=2, neg='-', pos='') |
Convert signed `degrees` to string, without suffix. Arguments: `deg` - Degrees to be formatted (`degrees`). `form` - Optional `deg` format (`str` or F_D, F_DM, F_DMS, F_DEG, F_MIN, F_SEC, F__E, F__F, F__G, F_RAD, F_D_, F_DM_, F_DMS_, F_DEG_, F_MIN_, F_SEC_, F__E_, F__F_, F__G_, F_RAD_, F_D__, F_DM__, F_DMS__, F_DEG__, F_MIN__, F_SEC__, F__E__, F__F__, F__G__ or F_RAD__). `prec` - Optional number of decimal digits (0..9 or `None` for default). Trailing zero decimals are stripped for `prec` values of 1 and above, but kept for negative `prec`. `sep` - Optional separator (`str`). `ddd` - Optional number of digits for deg° (2 or 3). `neg` - Optional sign for negative degrees ('-'). `pos` - Optional sign for positive degrees (''). Returns: Degrees in the specified form (`str`).