How to Install and Uninstall proj-rdnap Package on Ubuntu 21.10 (Impish Indri)

Last updated: July 06,2024

1. Install "proj-rdnap" package

Please follow the guidelines below to install proj-rdnap on Ubuntu 21.10 (Impish Indri)


    
        
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                sudo apt update
            
                    
    
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            $
        

        
            
                sudo apt install
            
                        
                proj-rdnap
            
                    
    
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2. Uninstall "proj-rdnap" package

Here is a brief guide to show you how to uninstall proj-rdnap on Ubuntu 21.10 (Impish Indri):


    
        
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                sudo apt remove
            
                        
                proj-rdnap
            
                    
    
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            $
        

        
            
                sudo apt autoclean && sudo apt autoremove
            
                    
    
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3. Information about the proj-rdnap package on Ubuntu 21.10 (Impish Indri)

Package: proj-rdnap
Architecture: all
Version: 2008+2018-5
Priority: optional
Section: multiverse/science
Origin: Ubuntu
Maintainer: Ubuntu Developers
Original-Maintainer: Debian GIS Project
Bugs: https://bugs.launchpad.net/ubuntu/+filebug
Installed-Size: 28922
Depends: proj-data
Recommends: proj-bin
Filename: pool/multiverse/p/proj-rdnap/proj-rdnap_2008+2018-5_all.deb
Size: 4998032
MD5sum: 1b848bd3df3d67e36fc9572e4df5dcd7
SHA1: fa28119cba46c1baf7a447528e35a738252020b9
SHA256: 0ee034671e3f27f64ffe06f0d808c514b1adaa670a37044600716f7a9f365f26
SHA512: 20a404fdda82fa81f4a9c21e6f6073bc88736bcd39793032a1a82cfe3589ef7d366bf1548474603b7c028996598c4d7c222c3f598cf6b1c96a6cb5e69d345abe
Homepage: https://www.kadaster.nl/transformatie-van-coordinaten
Description-en: RDNAP grid correction files for PROJ
Kadaster and Rijkswaterstaat CIV, working together under the name RDNAP,
developed RDNAPTRANS™2008, the precise and official transformation
between ETRS89 and the dutch national horizontal and vertical coordinate
reference systems the Stelsel van de Rijksdriehoeksmeting (RD) and the
Normaal Amsterdams Peil (NAP). A ‘simplified’ procedure has been
developed which uses a NTv2-grid for the transformation between ETRS89
and RD as well as a VDatum-grid for the transformation between ETRS89
and NAP. This ‘simplified’ procedure has the following limitations:
.
1) The rdtrans2008 NTv2-grid can only give identical results to
RDNAPTRANS™2008 within 1 millimeter at ground level onshore and at
mean sea level offshore. The horizontal deviation is approximately
1 millimeter per 50 meter height difference from ground level or mean
sea level.
2) An exception to 1) is the border of the RDNAPTRANS™2008 correction
grid. Transformation results within cells of the rdtrans2008 NTv2-grid
that are intersected by the border of the RDNAPTRANS™2008 correction
grid can result in deviations of up to 20 centimeter.
3) The naptrans2008 VDatum-grid cannot be used to determine deflections
of the vertical. For this the NLGEO2004 geoid model has to be used.
4) The naptrans2008 VDatum-grid is referenced to the Bessel-1841 ellipsoid
and cannot be used stand-alone, it has to be used in combination with
the rdtrans2008 NTv2-grid.
.
Taking into account the limitations listed above, the rdtrans2008 NTv2-grid
and naptrans2008 VDatum-grid can be used as an alternative to
RDNAPTRANS™2008 to transform geographic ETRS89-coordinates to
projected RD-coordinates with grid correction applied and NAP-heights.
.
Note that, although the resulting RD/NAP and ETRS89 coordinates from the
transformation will be correct, geographic Bessel-1841 coordinates will
differ in both procedures and should only be considered as an intermediate
result.
.
RDNAPTRANS™2018 contains a new datum transformation based on the updated
ETRS89 coordinates of realisation ETRF2000(R14). Next to this, a new and
slightly more precise quasi-geoid grid model is used. This NLGEO2018
quasi-geoid model covers a larger area including a large part of the North
Sea. A change with big impact is the use of a new data format of the grid
files and a corresponding transformation procedure that changes the order
of the steps of the transformation and uses a fixed height in the datum
transformation. As a result, the transformation is now possible conform a
de facto standard by including the datum transformation in the correction
grid (variant 2). This allows straightforward implementation in software
like GIS packages and can resolve current problems due to incorrect
implementations of the transformation.
.
Within the administrative borders of the Netherlands, the differences in
the resulting horizontal coordinates due to the changes from version 2008
to 2018 of RDNAPTRANS™ are at maximum 0.010 m at sea level (zero NAP
height), and at maximum an additional 0.001 m per 50 m height above or
below zero NAP height. The maximum change in the transformed height
coordinates due to the slightly more precise new quasi-geoid grid model
is about 0.025 m. The new correction grid has a different sampling in
ellipsoidal coordinates. With this resampling, discontinuities in the
correction grid are smoothed, especially outside the administrative
borders of the Netherlands, to allow bilinear interpolation. As a result,
changes in the resulting horizontal coordinates up to 0.05 m occur
occasionally in Belgium, Germany and the Dutch EEZ. To use the same
bounding box around the Netherlands including the Dutch EEZ of the
North Sea of the quasi-geoid grid model for the correction grid, the
correction grid has been faded out to zero correction for a seamless
land-sea transition. This introduces latitude and longitude corrections
up to 0.25 m in areas outside the former validity area of RDNAPTRANS™
where no corrections were defined before.
.
There are two variants for the implementation of RDNAPTRANS™2018.
Implementation variant 1 applies the datum transformation as a separate
step using a 3D similarity transformation. Implementation variant 2
includes the datum transformation in the correction grid and a different
quasi-geoid grid for the height transformation is used. The advantage of
implementation variant 1 is that it has no strict bounds for the area
where horizontal coordinates can be transformed correctly. The
disadvantage is that many software packages do not support
implementation variant 1. Implementation variant 2 is supported by more
software but can only be used within the bounds of the correction grid.
The difference in the resulting coordinates between the two variants is
well below 0.0010 m within the bounds of the RDNAPTRANS™2008 grids.
Although transformation at sea and even outside the grid bounds is
possible, the scale factor of the map projection increases rapidly and
also the precision of transformation back and forth deteriorates. There
are bounds to the recommended use of RD and NAP at sea and outside the
Netherlands.
Description-md5: 56b7d4a3af661f6f4c745f395411f4c9