[Qgis-user] RE: Qgis-user Digest, Vol 75, Issue 17 - 2. Re: Help: GPS data not showing in correct position

Sun May 6 14:34:16 PDT 2012

All, apologies, I mistakenly attached the adjacent geo reference file (TFW) file which I have now corrected. Ill try your step by step Saber and see if that works.

Many thanks

Ian

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From: qgis-user-bounces at lists.osgeo.org [qgis-user-bounces at lists.osgeo.org] on behalf of qgis-user-request at lists.osgeo.org [qgis-user-request at lists.osgeo.org]
Sent: 05 May 2012 17:00
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Subject: Qgis-user Digest, Vol 75, Issue 17

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Today's Topics:

   1. Re: QGIS on Android what is the difference between the    last
      two releases (Marco Bernasocchi)
   2. Re: Re: Help: GPS data not showing in correct position
      (Saber Razmjooei)
   3. Re: Help: GPS data not showing in correct position (Nick Hopton)

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Message: 1
Date: Sat, 5 May 2012 08:44:25 +0200
From: Marco Bernasocchi <marco at bernawebdesign.ch>
Subject: [Qgis-user] Re: QGIS on Android what is the difference
        between the     last two releases
To: qgis-user <qgis-user at lists.osgeo.org>
Message-ID:
        <CALWXeEFVPXFi9raTHQ4cc6CP6SvdQREemKjK4XtjyT=yD=2jFQ at mail.gmail.com>
Content-Type: text/plain; charset="iso-8859-1"

See the wiki. http://hub.qgis.org/wiki/android-qgis/Wiki
Its all explained. Vasically dont use the non armeabi packages since they
are unstabler.
Ciao

Marco Bernasocchi (mobile)
http://opengis.ch
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Message: 2
Date: Sat, 05 May 2012 09:39:07 +0100
From: Saber Razmjooei <saber.razmjooei at lutraconsulting.co.uk>
Subject: Re: [Qgis-user] Re: Help: GPS data not showing in correct
        position
To: albin.blaschka at standortsanalyse.net
Cc: qgis-user at lists.osgeo.org
Message-ID: <1336207147.1808.7.camel at ioio>
Content-Type: text/plain; charset="UTF-8"

1- You need tfw for ST but you have included SU. Once you got that
sorted, you need to ensure the CRS for the raster is set to the British
National Grid (EPSG:27700). To do that, right-click on the layer,
Properties, General tab and set the CRS to EPSG:27700

2- Set the canvas CRS to BNG (EPSG:27700) by going to (from the main
menu) Settings > Project Properties ... CRS tab

3- When you add your GPS, select Lat as X field and Long as Y field.
Please note that as default it's the other way round in the dialogue
box.

4- Ensure the GPS layer loaded as WGS84 (EPSG: 4326)

5- Turn on the OTF and it should work.

Cheers
Saber
_________________
Saber Razmjooei
Lutra Consulting
www.lutraconsulting.co.uk

-----Original Message-----
From: Albin Blaschka <albin.blaschka at standortsanalyse.net>
Reply-to: albin.blaschka at standortsanalyse.net
To: qgis-user at lists.osgeo.org
Subject: [Qgis-user] Re: Help: GPS data not showing in correct position
Date: Sat, 05 May 2012 08:20:18 +0200

Am 2012-05-05 00:04, schrieb Ian kirk-ellis:
> All , yes Ive tried the "on the fly" setting but to no avail. I attch a link where I have uploaded the points, the mapping I am using and a google map plot the coords (which is right!). Any bright ideas please advise, I have some other data from another source where I have a similar problem. Please help :-)
>

Hello,

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...)

Maybe for a little background, a look on wikipedia...
http://en.wikipedia.org/wiki/Map_projection

HTH,
Albin

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Message: 3
Date: Sat, 5 May 2012 01:58:43 -0700 (PDT)
From: Nick Hopton <nhopton at gmail.com>
Subject: [Qgis-user] Re: Help: GPS data not showing in correct
        position
To: qgis-user at lists.osgeo.org
Message-ID: <1336208323126-4954178.post at n6.nabble.com>
Content-Type: text/plain; charset=us-ascii

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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