[Qgis-user] information

[Brent Wood]

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 <gillwn at hotmail.com>
 To: "qgis-user at lists.osgeo.org" <qgis-user at 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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