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-# README.us_nga
-
-The files in this section result from the conversion of datasets originating
-from [US NOAA](https://www.ngs.noaa.gov)
-
-## Included grids
-
-### USA: NAD27 and older CRS -> NAD83
-
-*Source*: [.los/.las files coming from NOAA](https://www.ngs.noaa.gov/PC_PROD/NADCON/NADCON.zip)  
-*Format*: GeoTIFF converted from CTable2  
-*License*: Public Domain
-
-* alaska - Alaska
-* conus - Conterminous U.S.
-* hawaii - Hawaii. Old Hawaiian (EPSG:4135) to NAD83
-* prvi - Puerto Rico, Virgin Is. Puerto Rico (EPSG:4139) to NAD83
-* stgeorge - St. George Is, Alaska. St. George Island (EPSG:4138) to NAD83
-* stlrnc - St. Lawrence Is., Alaska. St. Lawrence Island (EPSG:4136) to NAD83
-* stpaul - St. Paul Is., Alaska. St. Paul Island (EPSG:4137) to NAD83
-
-### USA: NAD83 -> NAD83 (HARN/HPGN)
-
-*Source*: [.los/.las files coming from NOAA](https://www.ngs.noaa.gov/PC_PROD/NADCON/NADCON.zip)  
-*Format*: GeoTIFF converted from NTv2  
-*License*: Public Domain
-
-Grid data for high precision conversion of geographic coordinates from
-the original NAD83 (1986) (EPSG:4269) to NAD83 High Precision Geodetic Networks
-(HPGNs) (EPSG:4152), also referred to as High Accuracy Reference Networks (HARNs).
-NAD 83 coordinates based on the HPGN/HARN surveys changed approximately 0.2
-to 1.0 meter relative to the original NAD 83 (1986) adjustment.
-
-Those files have been converted to NTv2 grids with the
-[build_nad83_harn.sh](https://raw.githubusercontent.com/OSGeo/proj-datumgrid/master/north-america/build_nad83_harn.sh) script.
-
-* *hpgn.tif (51 files)
-
-Also include a few files which are duplicate of *hpgn.tif files, for historic reasons:
-
-* FL.tif - Florida
-* MD.tif - Maryland
-* TN.tif - Tennessee
-* WI.tif - Wisconsin
-* WO.tif - Washington, Oregon, N. California
-
-### Continental USA VERTCON: NGVD (19)29 height to NAVD (19)88 height
-
-*Source*: converted from [NOAA VERTCON .94 grids](https://www.ngs.noaa.gov/PC_PROD/VERTCON/)  
-*Converter*: vertcon_94_to_gtx.py  
-*Format*: GeoTIFF converted from GTX  
-*License*: Public Domain
-
-Transform NGVD (19)29 height to NAVD (19)88 height. The .tif files contain
-the offset to add to NGVD 29 heights to get NAVD 88 heights.
-
-The horizontal grid coordinates may be referenced to NAD27 or NAD83
-
-* vertconc.tif
-* vertcone.tif
-* vertconw.tif
-
-### USA GEOID1999 model (superseded): NAVD88 height to NAD83
-
-*Source*: converted from [NOAA NGS .bin grids](https://geodesy.noaa.gov/GEOID/GEOID99/)  
-*Converter*: build_g1999.sh  
-*Format*: GeoTIFF converted from GTX  
-*License*: Public Domain
-
-The GEOID99 model is known as a hybrid geoid model, combining
-gravimetric information with GPS ellipsoid heights on leveled bench marks.
-The GEOID99 model was developed to support direct conversion between
-NAD 83 GPS ellipsoidal heights and NAVD 88 orthometric heights.
-
-It is superseded by later GEOIDxx models
-
-* g1999u01.tif to g1999u08.tif : Conterminous US
-* g1999a01.tif to g1999a04.tif : Alaska
-* g1999h01.tif : Hawaii
-* g1999p01.tif : Puerto Rico
-
-### USA GEOID2003 model (superseded): NAVD88 height to NAD83
-
-*Source*: converted from [NOAA NGS .bin grids](https://geodesy.noaa.gov/GEOID/GEOID03/)  
-*Converter*: build_g2003.sh  
-*Format*: GeoTIFF converted from GTX  
-*License*: Public Domain
-
-The GEOID03 model is known as a hybrid geoid model, combining
-gravimetric information with GPS ellipsoid heights on leveled bench marks.
-The GEOID03 model was developed to support direct conversion between
-NAD 83 GPS ellipsoidal heights and NAVD 88 orthometric heights.
-
-It is superseded by later GEOIDxx models
-
-* geoid03_conus.tif : Conterminous US
-* g2003a01.tif to g2003a04.tif : Alaska
-* g2003h01.tif : Hawaii
-* g2003p01.tif : Puerto Rico
-
-### USA GEOID2006 model (superseded): NAVD88 height to NAD83 (Alaska only)
-
-*Source*: converted from [NOAA NGS .bin grids](https://geodesy.noaa.gov/GEOID/GEOID06/)  
-*Converter*: build_g2006.sh  
-*Format*: GeoTIFF converted from GTX  
-*License*: Public Domain
-
-GEOID06 is a refined hybrid geoid model for Alaska only.
-
-GEOID06 converts between the U.S. ellipsoidal datum, NAD 83, and the U.S.
-vertical datum, NAVD 88. GEOID06 is built largely on the USGG2003 gravimetric geoid.
-
-It is superseded by later GEOIDxx models
-
-* geoid06_ak.tif : Alaska
-
-### USA GEOID2009 model (superseded): NAVD88/PRVD02/VIVD09/GUVD04 height to NAD83
-
-*Source*: converted from [NOAA NGS .bin grids](https://www.ngs.noaa.gov/GEOID/GEOID09/)  
-*Converter*: build_g2009.sh  
-*Format*: GeoTIFF converted from GTX  
-*License*: Public Domain
-
-The GEOID09 model is known as a hybrid geoid model, as it is modified
-from a gravimetric model to fit GPS ellipsoid heights on leveled bench marks.
-The GEOID09 model refers to a GRS-80 shaped ellipsoid,
-centered at the NAD83 origin.  It supports direct conversion between
-NAD83 GPS ellipsoidal heights and NAVD88, GUVD04 and ASVD03 orthometric heights,
-and will support future vertical datums PRVD02 nad VIVD09.
-
-* geoid09_conus.tif : Conterminous US.
-* geoid09_ak.tif : Alaska.
-* g2009h01.tif : Hawaii
-* g2009g01.tif : Guam and Northern Mariana Islands.
-* g2009s01.tif : American Samoa.
-* g2009p01.tif : Puerto Rico / U.S. Vigin Islands.
-
-### USA GEOID12B model (partial superseded): NAVD88/PRVD02/VIVD09/GUVD04/NMVD03/ASVD02 height to NAD83(2011)/NAD83(MA11)/NAD83(PA11)
-
-*Source*: converted from [NOAA NGS .bin grids](https://www.ngs.noaa.gov/GEOID/GEOID12B/)  
-*Converter*: build_g2012.sh  
-*Format*: GeoTIFF converted from GTX  
-*License*: Public Domain
-
-GEOID12B is a hybrid geoid height model that can transform between the relevant
-vertical datum for each region to a NAD 83 ellipsoid height
-See https://www.ngs.noaa.gov/GEOID/GEOID12B/faq_2012B.shtml for more details.
-
-* g2012bu0.tif : Conterminous US, referenced to NAD83(2011). Vertical datum: NAVD88
-* g2012ba0.tif : Alaska, referenced to NAD83(2011). Vertical datum: NAVD88
-* g2012bh0.tif : Hawaii, referenced to NAD83(PA11). Vertical datum: identical to that of USGG2012, which is offset by 50-60 cm from some Local Tidal bench mark values. 
-* g2012bg0.tif : Guam and Northern Mariana Islands, referenced to NAD83(PA11). Vertical datum: GUVD04/NMVD03
-* g2012bs0.tif : American Samoa, referenced to NAD83 (PA11). Vertical datum: ASVD02
-* g2012bp0.tif : Puerto Rico / U.S. Vigin Islands, referenced to NAD83(2011). Vertical datum: PRVD02 and VIVD09
-
-The g2012bu0.tif and g2012bp0.tif grids are superseded by the
-g2018p0.tif and g2018p0.tif grids of GEOID18.
-
-### USA GEOID18 model: NAVD88/PRVD02 height to NAD83(2011)
-
-*Source*: converted from [NOAA NGS .bin grids](https://www.ngs.noaa.gov/GEOID/GEOID18/)  
-*Converter*: build_g2018.sh  
-*Format*: GeoTIFF converted from GTX  
-*License*: Public Domain
-
-GEOID18 is intended for use with coordinates in the North American Datum of 1983 (2011)
-[NAD 83 (2011) epoch 2010.00]. It provides orthometric heights consistent with the
-North American Vertical Datum of 1988 (NAVD 88), the Puerto Rico Vertical Datum of
-2002 (PRVD02), or the Virgin Islands Vertical Datum of 2009 (VIVD09).
-
-GEOID18 covers CONUS, Puerto Rico, and the U.S. Virgin Islands and supersedes
-GEOID12B in these regions. GEOID18 does NOT cover Alaska, Hawaii, Guam and the
-Commonwealth of the Northern Mariana Islands (CNMI) where users should continue
-to use GEOID12B.
-
-* g2018u0.tif : Conterminous US, referenced to NAD83(2011). Vertical datum: NAVD88
-* g2018p0.tif : Puerto Rico / U.S. Vigin Islands, referenced to NAD83(2011). Vertical datum: PRVD02 and VIVD09