Re: NTv2 file BC_98_05.gsb of British Columbia

On Tue, 12 Nov 2024 17:31:37 +0100, Fred Killet wrote:

[NTv2 file BC_98_05.gsb download from a100.gov.bc.ca site]

Yes, I tried Filezilla, but it did not work. May be I need some
parameters therefore.

IMHO, the FTP server is just down. Any connection attempt times out and
a ping to the server comes back empty, as well. FWIW, the links (if the
server starts to work, again, at some time) can be found further down.
Maybe try the email contact listed at the end?

Apart from this, you probably know about the central Canadian open GIS
data website? After (free) registration you get access to NTv2 binary
transformation files for several regions (including BC):

https://webapp.csrs-scrs.nrcan-rncan.gc.ca/geod/data-donnees/transformations.php

But the file BC_98_05.gsb isn't included, over there. Probably it would
be best to ask their webmaster/support about this. Maybe, there is sth.
wrong with that transformation file and it therefore is excluded from
download?

Another Canadian open data site comes back with even less results:

https://search.open.canada.ca/data/?search_text=gsb


HTH.
Bernd


<https://a100.gov.bc.ca/pub/mascotw/protected/convert.html>

National Transformation Coordinate Conversions
==============================================

The official software for conversion of coordinates from NAD27 to various
versions of NAD83 or conversion between NAD83 versions (latitude/longitude
or UTM) in British Columbia is called the National Transformation Version
2.0 (NTv2.0).

The Canada-wide software was developed by the Federal Geodetic Survey
Division in cooperation with the provinces. For a web application visit
https://webapp.csrs-scrs.nrcan-rncan.gc.ca/geod/tools-outils/ntv2.php
and to download a desktop application visit

https://webapp.csrs-scrs.nrcan-rncan.gc.ca/geod/tools-outils/applications.php*ntv2

Please refer to the
ftp://ftp.gdbc.gov.bc.ca/sections/outgoing/gsr/NTv2.0/Disclaimer.txt
file before proceeding.  By continuing you have implicitly agreed to the
disclaimer.

ftp://ftp.gdbc.gov.bc.ca/sections/outgoing/gsr/NTv2.0/ReadMe.doc
Read Me in order to determine which transformation(s) you require.
Also the files
ftp://ftp.gdbc.gov.bc.ca/sections/outgoing/gsr/NTv2.0/Naming.txt
and
ftp://ftp.gdbc.gov.bc.ca/sections/outgoing/gsr/NTv2.0/Numbering.doc
list equivalent naming and numbering schemes used for the various NAD83
re-adjustment versions.

IMPORTANT - When performing transformations on Vancouver Island please refer
to the file
ftp://ftp.gdbc.gov.bc.ca/sections/outgoing/gsr/NTv2.0/NVI-CRDwarning.doc


The following Transformations can be performed by downloading the
appropriate Binary Grid Shift file (.GSB) listed below for use / input
to the NTv2 software:

Or download via the
ftp://ftp.gdbc.gov.bc.ca/sections/outgoing/gsr/NTv2.0/BC-Adjustment-Transformation.xls
Graphics Spread Sheet by clicking on the pale blue arrows within.

(Log on as: Anonymous - No Password Required)

NAD27 to NAD83(PRF1998): ftp://ftp.gdbc.gov.bc.ca/sections/outgoing/gsr/NTv2.0/BC_27_98.GSB
NAD27 to NAD83(CRD2000): ftp://ftp.gdbc.gov.bc.ca/sections/outgoing/gsr/NTv2.0/CRD27_00.GSB
NAD27 to NAD83(NVI2005): ftp://ftp.gdbc.gov.bc.ca/sections/outgoing/gsr/NTv2.0/NVI27_05.GSB
NAD27 to NAD83(PRF2005): ftp://ftp.gdbc.gov.bc.ca/sections/outgoing/gsr/NTv2.0/BC_27_05.GSB
NAD83(NMIP93) to NAD83(PRF1998): ftp://ftp.gdbc.gov.bc.ca/sections/outgoing/gsr/NTv2.0/BC_CSRS.GSB
NAD83(NMIP93) to NAD83(CRD2000): ftp://ftp.gdbc.gov.bc.ca/sections/outgoing/gsr/NTv2.0/CRD93_00.GSB
NAD83(NMIP93) to NAD83(NVI2005): ftp://ftp.gdbc.gov.bc.ca/sections/outgoing/gsr/NTv2.0/NVI93_05.GSB
NAD83(NMIP93) to NAD83(PRF2005): ftp://ftp.gdbc.gov.bc.ca/sections/outgoing/gsr/NTv2.0/BC_93_05.GSB
NAD83(PRF1998) to NAD83(CRD2000): ftp://ftp.gdbc.gov.bc.ca/sections/outgoing/gsr/NTv2.0/CRD98_00.gsb
NAD83(PRF1998) to NAD83(NVI2005): ftp://ftp.gdbc.gov.bc.ca/sections/outgoing/gsr/NTv2.0/NVI98_05.GSB
NAD83(PRF1998) to NAD83(PRF2005): ftp://ftp.gdbc.gov.bc.ca/sections/outgoing/gsr/NTv2.0/PRF2005a.GSB

For information on MASCOT in B.C., please contact:
mailto:GeoBCinfo@gov.bc.ca

Copyright (1996) Province of British Columbia.