rouault North-America: add GEOID12B vertical grids from NAD83 heights to NAVD…
…88/... heights

Those grids, except the Hawaii one, are referenced in the EPSG
dataset in particular.
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README.NORTHAMERICA
alhpgn.gsb
arhpgn.gsb
azhpgn.gsb
build_g2012.sh
build_nad83_harn.sh
c1hpgn.gsb
c2hpgn.gsb
cnhpgn.gsb
cohpgn.gsb
cshpgn.gsb
emhpgn.gsb
eshpgn.gsb
ethpgn.gsb
flhpgn.gsb
g2012ba0.gtx
g2012bg0.gtx
g2012bh0.gtx
g2012bp0.gtx
g2012bs0.gtx
g2012bu0.gtx
gahpgn.gsb
guhpgn.gsb
gvr2000.gtx
gvr2016.gtx
hihpgn.gsb
iahpgn.gsb
ilhpgn.gsb
inhpgn.gsb
kshpgn.gsb
kyhpgn.gsb
lahpgn.gsb
mdhpgn.gsb
mehpgn.gsb
mihpgn.gsb
mnhpgn.gsb
mohpgn.gsb
mshpgn.gsb
nbhpgn.gsb
nchpgn.gsb
ndhpgn.gsb
nehpgn.gsb
njhpgn.gsb
nmhpgn.gsb
ntv2_0.gsb
nvhpgn.gsb
nyhpgn.gsb
ohhpgn.gsb
okhpgn.gsb
pahpgn.gsb
pvhpgn.gsb
schpgn.gsb
sdhpgn.gsb
tnhpgn.gsb
uthpgn.gsb
vahpgn.gsb
vertcon_94_to_gtx.py
vertconc.gtx
vertcone.gtx
vertconw.gtx
wihpgn.gsb
wmhpgn.gsb
wohpgn.gsb
wshpgn.gsb
wthpgn.gsb
wvhpgn.gsb
wyhpgn.gsb

README.md

PROJ-DATUMGRID-NORTH-AMERICA

The files in this package can be unpacked in the PROJ data directory. For an installed PROJ this may be /usr/local/share/proj or /usr/share/proj on unix style operating systems.

About the North America PROJ resource package

The North America PROJ resource package is a collections of grids and init-files that are not essential for the functionality of PROJ but still of general interest to PROJ-users in the region specific to the package.

Included grids

Canada: NAD27 -> NAD83

Source: Natural Resources Canada
Format: NTv2
License: Open Government Licence - Canada

Transform between NAD27 and NAD83 in Canada.

  • ntv2_0.gsb

Greenland: GRS80 ellipsoidal heights -> GVR2016

Source: Agency for Data Supply and Efficiency
Format: GTX
License: Creative Commons Attribution 4.0

Transform ellipsoidal heights to the local height system GVR2016. The horizontal grid coordinates are referenced to GR96.

  • gvr2016.gtx

Greenland: GRS80 ellipsoidal heights -> GVR2000

Source: Agency for Data Supply and Efficiency
Format: GTX
License: Creative Commons Attribution 4.0

Transform ellipsoidal heights to the local height system GVR2000. The horizontal grid coordinates are referenced to GR96.

  • gvr2000.gtx

USA: NAD83 -> NAD83 (HARN/HPGN)

Source: .los/.las files coming from NOAA Format: 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 script.

  • *hpgn.gsb (51 files)

Continental USA VERTCON: NGVD (19)29 height to NAVD (19)88 height

Source: converted from NOAA VERTCON .94 grids Converter: vertcon_94_to_gtx.py Format: GTX License: Public Domain

Transform NGVD (19)29 height to NAVD (19)88 height. The .gtx files contain the offset (in millimeter) to add to NGVD 29 heights to get NAVD 88 heights.

So with PROJ 5.2, to convert from NGVD 29 to NAVD 88, you need to a multiplication by 0.001 to convert from millimeter to meter: +proj=pipeline +step=vgridshift +multiplier=0.001 +grids=vertconw.gtx,vertconc.gtx,vertcone.gtx

The horizontal grid coordinates may be referenced to NAD27 or NAD83

  • vertconc.gtx
  • vertcone.gtx
  • vertconw.gtx

USA GEOID12B model: NAD83(2011)/NAD83(MA11)/NAD83(PA11) to NAVD88/PRVD02/VIVD09/GUVD04/NMVD03/ASVD02 height

Source: converted from NOAA NGS .bin grids Converter: build_g2012.sh Format: GTX License: Public Domain

GEOID12B is a hybrid geoid height model that can transform between a NAD 83 ellipsoid height and the relevant vertical datum for each region. See https://www.ngs.noaa.gov/GEOID/GEOID12B/faq_2012B.shtml for more details.

  • g2012bu0.gtx : Conterminous US, referenced to NAD83(2011). Vertical datum: NAVD88
  • g2012ba0.gtx : Alaska, referenced to NAD83(2011). Vertical datum: NAVD88
  • g2012bh0.gtx : 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.gtx : Guam and Northern Mariana Islands, referenced to NAD83(PA11). Vertical datum: GUVD04/NMVD03
  • g2012bs0.gtx : American Samoa, referenced to NAD83 (PA11). Vertical datum: ASVD02
  • g2012bp0.gtx : Puerto Rico / U.S. Vigin Islands, referenced to NAD83(2011). Vertical datum: PRVD02 and VIVD09

Included init-files

Greenland: System definitions related to GR96

Source: Agency for Data Supply and Efficiency
License: Creative Commons Attribution 4.0

Init files with various transformations and conversions of relevance in Greenland. All definitions in the init file uses the local GR96 reference frame as a pivot datum. More information can be found in the NordicTransformations repository.

  • GL