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Today's Topics:
1. Re: problems with georeferencing results (Ramon Andi?ach)
2. RE: how to edit .gpx (Gerardo Jimenez)
3. Re: problems with georeferencing results (Richard Duivenvoorde)
4. Re: problems with georeferencing results (G. Allegri)
----------------------------------------------------------------------
Message: 1
Date: Wed, 26 Oct 2011 06:46:13 +0800
From: Ramon Andi?ach<[email protected]>
Subject: Re: [Qgis-user] problems with georeferencing results
To: qgis-user<[email protected]>
Message-ID:<[email protected]>
Content-Type: text/plain; charset=iso-8859-1
I have no good reason to say this other than a niggling suspicion[1] but, yes I
think it can.
-ramon.
[1] We occasionally have problems with the georeferencer, where it tries to
rotate an image that shouldn't need to be. It's rare enough that I haven't been
able to track it down properly, but this is on my suspect list.
On 26/10/2011, at 06:18 , G. Allegri wrote:
Sure Baren, this was just an exercise ;)
I wanted to test regeoreferencing a raster and compare manual georeferencing
against reprojection.
I'm wondering if manually regeoreferencing an already georeferenced raster can
break things...
Inviato da dispositivo mobile
Il giorno 25/ott/2011 22.43, "Barend Köbben"<[email protected]> ha scritto:
Hi Giovanni,
I don't understand: you want to change a projected raster (in CRS 3003) to
another projection (23023), so why do you need the georeferencing plugin?
The data is already referenced, so it sounds to me you just want to
re-project it, using the Raster> Warp menu.
Or am I missing something...?
Yours,
--
Barend Köbben (Senior Lecturer)
ITC - University of Twente, Faculty of Geo-Information
Science and Earth Observation
PO Box 217, 7500AE Enschede (The Netherlands)
+31-(0)53 4874 253
On 25-10-11 21:23, "G. Allegri"<[email protected]> wrote:
Thanks for the reply.My raster infos are:
PROJCS["Monte Mario / Italy zone 1",
GEOGCS["Monte Mario",
DATUM["Monte_Mario",
SPHEROID["International 1924",6378388,297.0000000000014,
AUTHORITY["EPSG","7022"]],
AUTHORITY["EPSG","6265"]],
PRIMEM["Greenwich",0],
UNIT["degree",0.0174532925199433],
AUTHORITY["EPSG","4265"]],
PROJECTION["Transverse_Mercator"],
PARAMETER["latitude_of_origin",0],
PARAMETER["central_meridian",9],
PARAMETER["scale_factor",0.9996],
PARAMETER["false_easting",1500000],
PARAMETER["false_northing",0],
UNIT["metre",1,
AUTHORITY["EPSG","9001"]],
AUTHORITY["EPSG","3003"]]
Origin = (1554747.231034494200000,4924790.769999999600000)
Pixel Size = (100.000000000000000,-100.000000000000000)
Metadata:
AREA_OR_POINT=Area
Image Structure Metadata:
INTERLEAVE=BAND
Corner Coordinates:
Upper Left ( 1554747.231, 4924790.770) ( 9d41'17.95"E, 44d28'24.73"N)
Lower Left ( 1554747.231, 4678290.770) ( 9d39'49.22"E, 42d15'14.92"N)
Upper Right ( 1771747.231, 4924790.770) ( 12d24'49.32"E, 44d25'28.44"N)
Lower Right ( 1771747.231, 4678290.770) ( 12d17'30.22"E, 42d12'31.70"N)
Center ( 1663247.231, 4801540.770) ( 11d 0'50.84"E, 43d20'53.55"N)
Band 1 Block=2170x1 Type=Float32, ColorInterp=Gray
Min=-3.876 Max=2051.503
Minimum=-3.876, Maximum=2051.503, Mean=152.789, StdDev=265.873
NoData Value=0
Metadata:
STATISTICS_MINIMUM=-3.8761155605316
STATISTICS_MAXIMUM=2051.5034179688
STATISTICS_MEAN=152.78946158147
STATISTICS_STDDEV=265.87340110007
As you can see the CRS is correctly defined, and the other metadata are
correct.
OTFR works fine, the raster is correctly reprojected on the 23032
reference.
No tfw or aux files in the same folder....
It's making me crazy!
giovanni
2011/10/25 Richard Duivenvoorde<[email protected]>
On 2011-10-25 19:04, G. Allegri wrote:
Here it is the GCP list picture: http://bit.ly/suh5UL
(I wonder why ths srcY coordinates are shown as negative values)
What is projection of your raster, is it really epsg:3003 (to be tested
with 'gdalinfo yourraster'.)
Is there maybe a tfw file hanging around which determines another extent
four your source raster? If seen this behaviour recently while using the
plugin.
Try to set your tiff aside from other files, create a fresh epsg:23032
project with 'on the fly' and try again?
Hope this helps.
Regards,
Richard Duivenvoorde
Faculty of Geo-Information Science and Earth Observation (ITC)
University of Twente
Chamber of Commerce: 501305360000
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------------------------------
Message: 2
Date: Tue, 25 Oct 2011 21:27:27 -0400
From: Gerardo Jimenez<[email protected]>
Subject: RE: [Qgis-user] how to edit .gpx
To:<[email protected]>
Message-ID:<[email protected]>
Content-Type: text/plain; charset="iso-8859-1"
You can try and ouside solution, also free, try EasyGPX. You can make your own
list of waypoints and routes etc.
Gerardo Jiménez Delgado
Instituto de Investigaciones Antropológicas
Universidad Nacional Autónoma de México
Ciudad Universitaria s/n
Coyoacan 04510
Mexico City
Mexico
56 22 95 16
Date: Tue, 25 Oct 2011 22:40:27 +0300
Subject: Re: [Qgis-user] how to edit .gpx
From: [email protected]
To: [email protected]
CC: [email protected]
Hi,
This is a known limitation. You can delete and add objects but not
edit existing one.
See a bug report for more information: http://hub.qgis.org/issues/2219
-Lauri
On Tue, Oct 25, 2011 at 10:14 PM, M.E.Dodd<[email protected]> wrote:
Can load a .gpx but can't seem to edit it, the editing button stays greyed out
(qgis 1.7). can save to .kml or shapefile and do edits but then loose some
info from the original .gpx
looking at posts it seems that editing gpx has been in qgis for some time but i
can't see how to do it.
--
The Open University is incorporated by Royal Charter (RC 000391), an exempt charity
in England& Wales and a charity registered in Scotland (SC 038302).
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Message: 3
Date: Wed, 26 Oct 2011 09:23:35 +0200
From: Richard Duivenvoorde<[email protected]>
Subject: Re: [Qgis-user] problems with georeferencing results
To: "G. Allegri"<[email protected]>
Cc: qgis-user<[email protected]>
Message-ID:<[email protected]>
Content-Type: text/plain; charset=ISO-8859-1
On 2011-10-26 00:42, G. Allegri wrote:
Ok, i got it.
The reason it doesn't work is probably easily explained: the source X/Y
are considered as raster space coordinates, while I thought that having
the raster a CRS assigned this was kept into account during the warping.
Probably manual re-georeferencing is conceptually unuseful, outside my
exercise. Even if reprojection wasn't enough, the best way would be to
remove any CRS reference from it.
Tomorrow I will do more tests, but I'm pretty sure that I was simply
trying a wrong procedure...
I think qgis/ogr takes your crs into account. But if you open your
raster (tiff) in Gimp, and save it again as a tiff, Gimp will 'help' you
to remove the crs information from your geo(tiff), giving you a plane
raster with not crs information to do your tests :-)
R
------------------------------
Message: 4
Date: Wed, 26 Oct 2011 10:54:42 +0200
From: "G. Allegri"<[email protected]>
Subject: Re: [Qgis-user] problems with georeferencing results
To: [email protected]
Cc: qgis-user<[email protected]>
Message-ID:
<CAB4g1=y6k+k5ys9xkfpf9mtu-glqtow6nuclzamceqxuke+...@mail.gmail.com>
Content-Type: text/plain; charset="iso-8859-1"
Richard, I can strip the crs off using gdal_translate and setting a Baseline
profile. But I wanted to test what happens when a raster is already
georeferenced.
Giovanni
Inviato da dispositivo mobile
Il giorno 26/ott/2011 09.23, "Richard Duivenvoorde"<[email protected]> ha
scritto:
On 2011-10-26 00:42, G. Allegri wrote:
Ok, i got it.
The reason it doesn't work is probably easily explained: the source X/Y
are considered as raster space coordinates, while I thought that having
the raster a CRS assigned this was kept into account during the warping.
Probably manual re-georeferencing is conceptually unuseful, outside my
exercise. Even if reprojection wasn't enough, the best way would be to
remove any CRS reference from it.
Tomorrow I will do more tests, but I'm pretty sure that I was simply
trying a wrong procedure...
I think qgis/ogr takes your crs into account. But if you open your
raster (tiff) in Gimp, and save it again as a tiff, Gimp will 'help' you
to remove the crs information from your geo(tiff), giving you a plane
raster with not crs information to do your tests :-)
R
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