Hi Gill,
QGIS needs to know exactly what CRS the data is before it can convert them to
something else. The EPSG code is normally how you do this. If you
see:http://spatialreference.org/ref/?search=irishthere seem to be 6
possibilities. I'm not sure what the difference is, but you should identify the
correct EPSG code for your coordinates.
You can then (in QGIS with the dataset opened as a map - have you got that
far?) right click on the layer in the layer tab to bring up the layer menu, &
use the "Set layer CRS" facility to tell QGIS this (if it does not already know
- in some cases it may have read this from the data automatically).
There are now 3 ways to "translate a long list of Irish grid references to a
map which has lat and long data" depending on exactly what you mean.
You can then go to Project->Properties to set the QGIS map to EPSG:4326, which
is basic lat/long coordinates. This will tell QGIS to display your Irish grid
data as lat/long - ie: reproject on the fly to provide you with a lat/long map.
You can use the layer menu to save your layer, in a different format and/or
projection as you specify. If you change the output CRS to EPSG:4326 & save it,
the new dataset will be have lat/long coordinates. This creates a new data file
(rather than a map), as a lat/long version of your data.
In the Print composer, for setting up a map layout for printing, you can have a
map in (say) Irish grid coordinates, but set up labelled ticks on the map frame
which are in lat/long. You can also choose to use decimal degrees, degrees with
decimal minutes, optional NSEW suffixes, etc. This gives you a locally
projected map labelled with degrees.
I hope this helps,
Cheers
Brent Wood
From: Gill Weyman <gil...@hotmail.com>
To: "qgis-user@lists.osgeo.org" <qgis-user@lists.osgeo.org>
Sent: Friday, February 19, 2016 11:51 PM
Subject: [Qgis-user] information
<!--#yiv1273304796 .yiv1273304796hmmessage
P{margin:0px;padding:0px;}#yiv1273304796
body.yiv1273304796hmmessage{font-size:12pt;font-family:Calibri;}-->HelloI am
new to qgis and wondering how I translate a long list of Irish grid references
to a map which has lat and long data?
Any pointing in the right direction would be appreciated.Gill
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