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Method: Geographic3D to GravityRelatedHeight (gtx)
Grid Files: g2003u01.bin
Remarks: Uses Geoid03 hybrid model. See information source for further information. Note: Source CRS is 2D, used in this application of the method as a pseudo-3D CRS.
Information source: National Geodetic Survey, http://www.ngs.noaa.gov/GEOID/
Revision date: 2015-11-25
Unit: metre
Geodetic CRS: NAD83
Datum: North American Datum 1983
Ellipsoid: GRS 1980
Prime meridian: Greenwich
Data source: EPSG
Revision date: 1995-06-02
Scope: Engineering survey, topographic mapping.
Area of use: United States (USA) - Alaska - east of 141°W; i.e. Panhandle.
Coordinate system: Cartesian 2D CS. Axes: easting, northing (X,Y). Orientations: east, north. UoM: m.
&stroke=red&width=2&path=41.0,-124.79|49.05,-124.79|49.05,-112.0|41.0,-112.0|41.0,-124.79)
Center coordinates
2020446.52 -630060.45
Projected bounds:
1467847.14 -1156772.16
2633962.59 -76077.23
WGS84 bounds:
-124.79 41.0
-112.0 49.05
Definition: OGC Well Known Text 2 (2019)
BOUNDCRS[ SOURCECRS[ PROJCRS["NAD83 / Alaska zone 1", BASEGEOGCRS["NAD83", DATUM["North American Datum 1983", ELLIPSOID["GRS 1980",6378137,298.257222101, LENGTHUNIT["metre",1]]], PRIMEM["Greenwich",0, ANGLEUNIT["degree",0.0174532925199433]], ID["EPSG",4269]], CONVERSION["SPCS83 Alaska zone 1 (meter)", METHOD["Hotine Oblique Mercator (variant A)", ID["EPSG",9812]], PARAMETER["Latitude of projection centre",57, ANGLEUNIT["degree",0.0174532925199433], ID["EPSG",8811]], PARAMETER["Longitude of projection centre",-133.666666666667, ANGLEUNIT["degree",0.0174532925199433], ID["EPSG",8812]], PARAMETER["Azimuth of initial line",323.130102361111, ANGLEUNIT["degree",0.0174532925199433], ID["EPSG",8813]], PARAMETER["Angle from Rectified to Skew Grid",323.130102361111, ANGLEUNIT["degree",0.0174532925199433], ID["EPSG",8814]], PARAMETER["Scale factor on initial line",0.9999, SCALEUNIT["unity",1], ID["EPSG",8815]], PARAMETER["False easting",5000000, LENGTHUNIT["metre",1], ID["EPSG",8806]], PARAMETER["False northing",-5000000, LENGTHUNIT["metre",1], ID["EPSG",8807]]], CS[Cartesian,2], AXIS["easting (X)",east, ORDER[1], LENGTHUNIT["metre",1]], AXIS["northing (Y)",north, ORDER[2], LENGTHUNIT["metre",1]], USAGE[ SCOPE["Engineering survey, topographic mapping."], AREA["United States (USA) - Alaska - east of 141°W; i.e. Panhandle."], BBOX[54.61,-141,60.35,-129.99]], ID["EPSG",26931]]], TARGETCRS[ VERTCRS["NAVD88 height", VDATUM["North American Vertical Datum 1988"], CS[vertical,1], AXIS["gravity-related height (H)",up, LENGTHUNIT["metre",1]], USAGE[ SCOPE["Geodesy, engineering survey, topographic mapping."], AREA["Mexico - onshore. United States (USA) - CONUS and Alaska - onshore - Alabama; Alaska; Arizona; Arkansas; California; Colorado; Connecticut; Delaware; Florida; Georgia; Idaho; Illinois; Indiana; Iowa; Kansas; Kentucky; Louisiana; Maine; Maryland; Massachusetts; Michigan; Minnesota; Mississippi; Missouri; Montana; Nebraska; Nevada; New Hampshire; New Jersey; New Mexico; New York; North Carolina; North Dakota; Ohio; Oklahoma; Oregon; Pennsylvania; Rhode Island; South Carolina; South Dakota; Tennessee; Texas; Utah; Vermont; Virginia; Washington; West Virginia; Wisconsin; Wyoming."], BBOX[14.51,172.42,71.4,-66.91]], ID["EPSG",5703]]], ABRIDGEDTRANSFORMATION["NAD83 to NAVD88 height (1)", METHOD["Geographic3D to GravityRelatedHeight (gtx)", ID["EPSG",9665]], PARAMETERFILE["Geoid (height correction) model file","g2003u01.bin"], USAGE[ SCOPE["Derivation of approximate gravity-related heights from GNSS observations."], AREA["United States (USA) - CONUS onshore north of 41°N and west of 112°W - Oregon and Washington; California and Nevada north of 41°N; Utah north of 41°N and west of 112°W; Idaho and Montana west of 112°W."], BBOX[41,-124.79,49.05,-112]], ID["EPSG",10013], REMARK["Uses Geoid03 hybrid model. See information source for further information. Note: Source CRS is 2D, used in this application of the method as a pseudo-3D CRS."]]]
Definition: JSON
{ "$schema": "https://proj.org/schemas/v0.7/projjson.schema.json", "type": "BoundCRS", "source_crs": { "type": "ProjectedCRS", "name": "NAD83 / Alaska zone 1", "base_crs": { "name": "NAD83", "datum": { "type": "GeodeticReferenceFrame", "name": "North American Datum 1983", "ellipsoid": { "name": "GRS 1980", "semi_major_axis": 6378137, "inverse_flattening": 298.257222101 } }, "coordinate_system": { "subtype": "ellipsoidal", "axis": [ { "name": "Geodetic latitude", "abbreviation": "Lat", "direction": "north", "unit": "degree" }, { "name": "Geodetic longitude", "abbreviation": "Lon", "direction": "east", "unit": "degree" } ] }, "id": { "authority": "EPSG", "code": 4269 } }, "conversion": { "name": "SPCS83 Alaska zone 1 (meter)", "method": { "name": "Hotine Oblique Mercator (variant A)", "id": { "authority": "EPSG", "code": 9812 } }, "parameters": [ { "name": "Latitude of projection centre", "value": 57, "unit": "degree", "id": { "authority": "EPSG", "code": 8811 } }, { "name": "Longitude of projection centre", "value": -133.666666666667, "unit": "degree", "id": { "authority": "EPSG", "code": 8812 } }, { "name": "Azimuth of initial line", "value": 323.130102361111, "unit": "degree", "id": { "authority": "EPSG", "code": 8813 } }, { "name": "Angle from Rectified to Skew Grid", "value": 323.130102361111, "unit": "degree", "id": { "authority": "EPSG", "code": 8814 } }, { "name": "Scale factor on initial line", "value": 0.9999, "unit": "unity", "id": { "authority": "EPSG", "code": 8815 } }, { "name": "False easting", "value": 5000000, "unit": "metre", "id": { "authority": "EPSG", "code": 8806 } }, { "name": "False northing", "value": -5000000, "unit": "metre", "id": { "authority": "EPSG", "code": 8807 } } ] }, "coordinate_system": { "subtype": "Cartesian", "axis": [ { "name": "Easting", "abbreviation": "X", "direction": "east", "unit": "metre" }, { "name": "Northing", "abbreviation": "Y", "direction": "north", "unit": "metre" } ] }, "id": { "authority": "EPSG", "code": 26931 } }, "target_crs": { "type": "VerticalCRS", "name": "NAVD88 height", "datum": { "type": "VerticalReferenceFrame", "name": "North American Vertical Datum 1988" }, "coordinate_system": { "subtype": "vertical", "axis": [ { "name": "Gravity-related height", "abbreviation": "H", "direction": "up", "unit": "metre" } ] }, "id": { "authority": "EPSG", "code": 5703 } }, "transformation": { "name": "NAD83 to NAVD88 height (1)", "method": { "name": "Geographic3D to GravityRelatedHeight (gtx)", "id": { "authority": "EPSG", "code": 9665 } }, "parameters": [ { "name": "Geoid (height correction) model file", "value": "g2003u01.bin", "id": { "authority": "EPSG", "code": 8666 } } ], "id": { "authority": "EPSG", "code": 10013 } } }
Definition: Mapnik
<?xml version="1.0" encoding="utf-8"?> <Map srs="+proj=omerc +no_uoff +lat_0=57 +lonc=-133.666666666667 +alpha=323.130102361111 +gamma=323.130102361111 +k=0.9999 +x_0=5000000 +y_0=-5000000 +datum=NAD83 +units=m +no_defs +type=crs"> <Layer srs="+proj=omerc +no_uoff +lat_0=57 +lonc=-133.666666666667 +alpha=323.130102361111 +gamma=323.130102361111 +k=0.9999 +x_0=5000000 +y_0=-5000000 +datum=NAD83 +units=m +no_defs +type=crs"> </Layer> </Map>
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