projected
US National Geodetic Survey
2009-07-29
true
false
http://www.opengis.net/def/crs/EPSG/0/3993
Guam 1963 / Guam SPCS
Replaced by NAD83(HARN) / Guam Map Grid (CRS code 4414) from 1995.
Guam - onshore.
144.58
145.01
13.18
13.7
OGP
2014-05-01
false
false
http://www.opengis.net/def/area/EPSG/0/3255
Guam - onshore
Large and medium scale topographic mapping, cadastral and engineering survey.
conversion
US Geological Survey Professional Paper 1395; "Map Projections - A Working Manual"; J. Snyder.
2011-06-30
true
false
13
28
20.87887
N
144
44
55.50254
E
http://www.opengis.net/def/coordinateOperation/EPSG/0/15400
Guam SPCS
Guam - onshore.
144.58
145.01
13.18
13.7
OGP
2014-05-01
false
false
http://www.opengis.net/def/area/EPSG/0/3255
Guam - onshore
Large and medium scale topographic mapping, cadastral and engineering survey.
US Geological Survey Professional Paper 1395; "Map Projections - A Working Manual"; J. Snyder.
2004-04-22
false
true
See information source or EPSG Guidance Note 7.
http://www.opengis.net/def/method/EPSG/0/9831
Guam Projection
Simplified form of Oblique Azimuthal Equidistant projection method.
Note: These formulas have been transcribed from EPSG Guidance Note #7-2. Users are encouraged to use that document rather than the text which follows as reference because limitations in the transcription will be avoided.
the forward conversion from latitude and longitude is given by:
x = (lon ? lonO) cos(lat) / [(1 ? e^2 sin^2(lat))^0.5]
E = FE + x
N = FN + M ? MO + ^2 tan(lat) [(1 ? e^2 sin^2(lat))^0.5] / (2a)}
where
M = a[(1 ? ^2/4 ? 3e^4/64 ? 5e^6/256 ?....)lat ? (3e^2/8 + 3e^4/32 + 45e^6/1024+....)sin(2 lat)
+ (^4/256 + 45e^6/1024 +.....)sin(4 lat) ? (35e^6/3072 + ....)sin(6 lat) + .....]
with lat in radians and MO for latO, the latitude of the natural origin, derived in the same way.
The reverse conversion from easting and northing to latitude and longitude requires iteration of three equations. The Guam projection uses three iterations, which is satisfactory over the small area of application. First MO for the latitude of the origin latO is derived as for the forward conversion. Then:
e' = [1 ? (1 ?^2)^0.5] / [1 + (1 ? e^2)^0.5]
and
M' = MO + (N ? FN) ? {(E ? FE)^2 tan(latO) [(1 ? e^2 sin^2(latO)^0.5] / (2a)}
mu' = M' / a(1 ? e^2/4 ? 3e^4/64 ? 5e^6/256 ?....)
lat' = mu' + (3e'/2 ? 27e'^3/32)sin(2mu') + (21e'^2/16 ? 55e'^4/32)sin(4mu') + (151e'^3/96)sin(6mu')
+ (1097e'^4/512)sin(8mu')
M" = MO + (N ? FN) ? {(E FE)^2 tan(lat') [(1 ? e^2 sin^2(lat'))^0] / (2a)}
mu" = M" / a(1 ? e^2/4 ? 3e^4/64 ? 5e^6/256 ?....)
lat" = mu" + (3e'/2 ? 27e'^3/32)sin(2mu") + (21e'^2/16 ? 55e'^4/32)sin(4mu") + (151e'^3/96)sin(6mu")
(1097 e'^4/512)sin(8mu")
M''' = MO + (N ? FN) ? {(E ? F)^2 ta(lat") [(1 ? e^2 sin^2(lat")^0.5] / (2a)}
mu''' = M''' / a(1 ? e^2/4 ? 3e^4/64 ? 5e^6/256 ?....)
lat''' = mu''' + (3e'/2 ? 27e'^3/32)sin(2mu''') + (21e'^2/16 ? 55e'^4/32)sin(4mu''') + (151e'^3/96)sin(6mu''')
+ (1097e'^4/512)sin(8mu''')
Then
lon = lonO + {(E ? FE) . [(1 ? e^2 sin^2 lat''')^0.5] / (a cos lat''')}
2
2
13.472466352778
EPSG guidance note number 7.
1999-09-09
false
The latitude of the point from which the values of both the geographical coordinates on the ellipsoid and the grid coordinates on the projection are deemed to increment or decrement for computational purposes. Alternatively it may be considered as the latitude of the point which in the absence of application of false coordinates has grid coordinates of (0,0).
http://www.opengis.net/def/parameter/EPSG/0/8801
Latitude of natural origin
144.748750705556
Abbeviated as "CM".
Abbreviation for "Central Meridian".
EPSG guidance note number 7.
2002-06-22
false
The longitude of the point from which the values of both the geographical coordinates on the ellipsoid and the grid coordinates on the projection are deemed to increment or decrement for computational purposes. Alternatively it may be considered as the longitude of the point which in the absence of application of false coordinates has grid coordinates of (0,0). Sometimes known as "central meridian (CM)".
http://www.opengis.net/def/parameter/EPSG/0/8802
Longitude of natural origin
50000
This alias applies only in the case of projection methods which have an axis positive west, e.g. Transverse Mercator (South Orientated).
EPSG guidance note number 7.
2002-07-31
false
Since the natural origin may be at or near the centre of the projection and under normal coordinate circumstances would thus give rise to negative coordinates over parts of the mapped area, this origin is usually given false coordinates which are large enough to avoid this inconvenience. The False Easting, FE, is the value assigned to the abscissa (east or west) axis of the projection grid at the natural origin.
http://www.opengis.net/def/parameter/EPSG/0/8806
False easting
50000
This alias applies only in the case of projection methods which have an axis positive south, e.g. Transverse Mercator (South Orientated).
EPSG guidance note number 7.
2002-07-31
false
Since the natural origin may be at or near the centre of the projection and under normal coordinate circumstances would thus give rise to negative coordinates over parts of the mapped area, this origin is usually given false coordinates which are large enough to avoid this inconvenience. The False Northing, FN, is the value assigned to the ordinate (north or south) axis of the projection grid at the natural origin.
http://www.opengis.net/def/parameter/EPSG/0/8807
False northing
geographic 2D
National Geodetic Survey
2009-07-29
true
false
http://www.opengis.net/def/crs/EPSG/0/4675
Guam 1963
Replaced by NAD83(HARN) alias Guam Geodetic Network 1993 (CRS code 4152) from 1995.
Guam - onshore.
144.58
145.01
13.18
13.7
OGP
2014-05-01
false
false
http://www.opengis.net/def/area/EPSG/0/3255
Guam - onshore
Topographic mapping, engineering survey, cadastral survey.
ellipsoidal
OGP
2008-06-23
false
http://www.opengis.net/def/cs/EPSG/0/6422
Ellipsoidal 2D CS. Axes: latitude, longitude. Orientations: north, east. UoM: degree
Coordinates referenced to this CS are in degrees. Any degree representation (e.g. DMSH, decimal, etc.) may be used but that used must be declared for the user by the supplier of data. Used in geographic 2D coordinate reference systems.
http://www.opengis.net/def/axis/EPSG/0/106
Lat
north
http://www.opengis.net/def/axis/EPSG/0/107
Long
east
geodetic
US National Geospatial Intelligence Agency (NGA). http://earth-info.nga.mil/
2008-06-24
false
http://www.opengis.net/def/datum/EPSG/0/6675
Guam 1963
Replaced by NAD83(HARN)
Topographic mapping.
Fundamental point: Tagcha. Latitude: 13°22'38.49"N, longitude: 144°45'51.56"E (of Greenwich).
1963-01-01
Cartesian
OGP
2001-04-29
false
http://www.opengis.net/def/cs/EPSG/0/4499
Cartesian 2D CS. Axes: easting, northing (X,Y). Orientations: east, north. UoM: m.
Used in projected and engineering coordinate reference systems.
http://www.opengis.net/def/axis/EPSG/0/41
X
east
http://www.opengis.net/def/axis/EPSG/0/42
Y
north