[Qgis-user] Re: Help: GPS data not showing in correct position

[Nick Hopton]

Albin Blaschka-5 wrote
> 
> as far as I can tell from your data, your rasterfile has a problem with 
> its projection: The associated .tfw file you put online had the wrong 
> name (the raster is named ST.tif, therefore the .tfw - file has to be 
> named ST.tfw).
> 
> So two questions to dig further:
> Is it the right .tfw file for that raster?
> 
> And in which projection is the raster - in the .tfw file are just 
> numbers, from which it is hard to guess for me, to which coordinate 
> system they belong to... (UTM or a national grid...)
> 

Hum, yes. The raster is for Ordnance Survey 100 x 100 km grid square 'ST'
and the TFW world file is for square 'SU'. You need to find the correct
world file for the raster (ST.TFW).

Put ST.TIF and ST.TFW in the same directory and load ST.TIF. Right-click on
ST.TIF in the layers panel and set its CRS to EPSG:27700, then set the
project CRS to EPSG:27700 and enable 'on-the-fly'.

The next problem is that the CSV file has its latitude column labelled as
'LONG' and its longitude column labelled as 'LAT' so fix this. Then load the
CSV file. Here, the points plot near to Evercreech.

Regards, Nick.

    


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