NAME
r.out.ntv2 - Exports NTv2 datum transformation grid
KEYWORDS
SYNOPSIS
r.out.ntv2
r.out.ntv2 --help
r.out.ntv2 latshift=string lonshift=string output=string [systemt=string] [majort=string] [minort=string] [systemf=string] [majorf=string] [minorf=string] [--help] [--verbose] [--quiet] [--ui]
Flags:
- --help
- Print usage summary
- --verbose
- Verbose module output
- --quiet
- Quiet module output
- --ui
- Force launching GUI dialog
Parameters:
- latshift=string [required]
- Input raster map of lattitude datum shift values
- lonshift=string [required]
- Input raster map of longitude datum shift values
- output=string [required]
- Output NTv2 datum transformation grid file
- systemt=string
- Transformation grid's destination coordinate system name
- Default: WGS84
- majort=string
- Major ellipsoid axis of the transformation grid's destination coordinate system
- Default: 6378137
- minort=string
- Minor ellipsoid axis of the transformation grid's destination coordinate system
- Default: 6356752.314245
- systemf=string
- Transformation grid's input coordinate system name
- Default: UNKNOWN
- majorf=string
- Major ellipsoid axis of the transformation grid's input coordinate system
- Default: UNKNOWN
- minorf=string
- Minor ellipsoid axis of the transformation grid's input coordinate system
- Default: UNKNOWN
r.out.ntv2 converts a pair of GRASS raster maps containing
longitude and lattitude coordinate offsets into an
NTv2 grid datum shift
file.
NTv2 format supports only single-precission floating point data. GRASS GIS
double-precision DCELL data need to be reduced to FCELL before export, eg.
using r.mapcalc float()
function.
The user should adjust the region and resolution to match the input raster
maps before export, using g.region.
PROJ.4 and the software that depend on it, including GDAL, GRASS, QGIS, assume
the NTv2 grid's destination coordinate system to be WGS84. The metadata values in
the grid's header set with majort
, minort
,
systemt
parameters are ignored, same as the input coordinate system
parameters (majorf
, minorf
, systemf
).
They are for documentation purposes only.
The CREATED
and UPDATED
output grid's metadata
fields are set to, respectively, current date and time, in YYYYMMDD and HHMMSS format.
NTv2 format description by ESRI
Maciej Sieczka
SOURCE CODE
Available at:
r.out.ntv2 source code
(history)
Latest change: Thursday Feb 03 09:32:35 2022 in commit: f17c792f5de56c64ecfbe63ec315307872cf9d5c
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GRASS Development Team,
GRASS GIS 8.3.dev Reference Manual