[Qgis-user] Re:Geo-referencing can't get it to work

[Marco Hugentobler]

Hi

The QGIS georeferencer also uses gdalwarp. So if it does not work for you with 
gdalwarp it might be better to ask on the gdal mailinglist.

> And WHY do I have to set the CRS in two spots in QGIS????(under
> settings/project properties, and settings/options).

in settings/project properties you set the map CRS of the current project. in 
settings/options you set the default CRS that is assigned for layers that have 
no associated CRS or where QGIS fails to recognize it.

Marco

Am Montag 02 Februar 2009 05:29:45 schrieb mtnbiketrail at zzz.com:
> New user, new to gis. Reloaded to ver 1.0 thinking .11 had a bug. Ubuntu
> hardy Heron
> Am having a lot of difficulty doing simple things.
>
> I gave up on trying to translate it using gdalwarp. I just get negative
> numbers similar to original info below, not UTM numbers
>
> So I tried stripping the data out of the tif by using Photoshop, saving
> as jpg, then geo-referencing it into QGIS.  I set up the base projection
> as EPSG:32610 (WGS84 UTM zone10n) and then put in 4 points according to
> the UTM grid markings, but it renders as a thin vertical line!
> I used these UTM numbers according to what was on the tif,
> upper left: 480000, 4607000
> lower left: 480000, 4595000
> lower right: 489000, 4595000
> upper right: 489000, 4607000
>
> And WHY do I have to set the CRS in two spots in QGIS????(under
> settings/project properties, and settings/options).
> Very frustrated.
>
>
>
> Using Gdalwarp.
> I have a California geotiff, that says it is Albers conic equal area,
> nad83, which I figured was EPSG:3310, yet no matter what I try, cannot
> get it into WGS84(EPSG:32610).
> I looked at the file in its native format using FWTools GUI, and this is
> what I get..
>
>     Driver: GTiff/GeoTIFF
>     Files: c:\downloads\gis\o41123e2.tif
>            c:\downloads\gis\o41123e2.aux
>     Size is 7985, 10839
>     Coordinate System is:
>     PROJCS[" Projection Name = Custom Units = meters GeoTIFF Units =
>     meters",
>         GEOGCS["NAD83",
>             DATUM["North_American_Datum_1983",
>                 SPHEROID["GRS 1980",6378137,298.2572221010002,
>                     AUTHORITY["EPSG","7019"]],
>                 AUTHORITY["EPSG","6269"]],
>             PRIMEM["Greenwich",0],
>             UNIT["degree",0.0174532925199433],
>             AUTHORITY["EPSG","4269"]],
>         PROJECTION["Albers_Conic_Equal_Area"],
>         PARAMETER["standard_parallel_1",34],
>         PARAMETER["standard_parallel_2",40.5],
>         PARAMETER["latitude_of_center",0],
>         PARAMETER["longitude_of_center",-120],
>         PARAMETER["false_easting",0],
>         PARAMETER["false_northing",-4000000],
>         UNIT["metre",1,
>             AUTHORITY["EPSG","9001"]]]
>     Origin = (-272395.388810177680000,406154.728782713530000)
>     Pixel Size = (1.527725641205797,-1.527725641205797)
>     Corner Coordinates:
>     Upper Left  ( -272395.389,  406154.729) (123d15'54.15"W, 41d37'50.02"N)
>     Lower Left  ( -272395.389,  389595.711) (123d15'29.60"W, 41d28'52.91"N)
>     Upper Right ( -260196.500,  406154.729) (123d 7'8.14"W, 41d38'3.35"N)
>     Lower Right ( -260196.500,  389595.711) (123d 6'44.69"W, 41d29'6.21"N)
>     Center      ( -266295.944,  397875.220) (123d11'19.14"W, 41d33'28.19"N)
>
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-- 
Dr. Marco Hugentobler
Institute of Cartography
ETH Zurich
Technical Advisor QGIS Project Steering Committee