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

mtnbiketrail at zzz.com mtnbiketrail at zzz.com
Sun Feb 1 20:29:45 PST 2009


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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