[Qgis-user] QGIS 1.7.4 Wroclaw to Mapinfo: adivice please

[BTinternet]

As a non-expert newcomer to QGIS I would most grateful for the forum's advice.

I have the task of taking TAB and JPG files created by a client in Mapinfo and drawing on them vector items using QGIS - and then returning the resulting SHP files (or SHP converted to Mapinfo MIF/MID files) to the client.  When I do this, however, the client declares that, the CRS for the resulting SHP or MIF/MID files are non-existent or wrong.

For example, Mapinfo TAB and associated JPG files was sent from my client.  If I look at the TAB file in Notepad, I see that the data are as follows:

!table
!version 300
!charset WindowsLatin1

Definition Table
  File "03sw.jpg"
  Type "RASTER"
  (512232,306415) (88,176) Label "Pt 1",
  (517111,303237) (5484,3782) Label "Pt 2",
  (512816.96000000002,303710.67999999999) (732,3234) Label "Pt 3",
  (516970.09000000003,306367.07000000001) (5436,339) Label "Pt 4",
  (513415.08000000002,303400.54999999999) (1389,3578) Label "Pt 5"
  CoordSys Earth Projection 8, 79, "m", -2, 49, 0.9996012717, 400000, -100000
  Units "m"

When I open the JPG in QGIS, I see that the CRS for the JPG is 'User Defined' and has the following definition:

+proj=tmerc +lat_0=49 +lon_0=-2 +k=0.9996012717 +x_0=400000 +y_0=-100000 +ellps=airy +towgs84=375,-111,431,-0,-0,-0,0 +units=m +no_defs

At this point, I'm not too sure whether or not QGIS has correctly interpreted the CRS for the Client's JPG.  Can anyone help me on this please?

When I create a SHP vector layer on top of the JPG, I make sure that it has the same 'User Defined' CRS as above and save the SHP layer as Mapinfo-useable MIF and MID files.  Looking at the MIF file in Notepad, I can see that the coordinates (shown bottom right in QGIS) of the vector file agree exactly with the original JPG raster.


When the MIF/MID files are opened by my Client however, the files are unusable because the CRS is 'non-existent or wrong'

Can anyone point out where I'm going wrong please?

Best regards

Robert Beasley
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