If I do not provide a source spatial reference to gdalwarp will the information in the geotiff be used instead?  ie. gdalwarp -t_srs &#39;EPSG:4326&#39; input.tif output.tif?<br><br>I do not have a real example because I do not have the file I am working with on this computer.  But an example gdalinfo would be:<br>

<br><pre class="fragment">PROJCS[&quot;NAD27 / UTM zone 11N&quot;,
    GEOGCS[&quot;NAD27&quot;,
        DATUM[&quot;North_American_Datum_1927&quot;,
            SPHEROID[&quot;Clarke 1866&quot;,6378206.4,294.978698213901]],
        PRIMEM[&quot;Greenwich&quot;,0],
        UNIT[&quot;degree&quot;,0.0174532925199433]],
    PROJECTION[&quot;Transverse_Mercator&quot;],
    PARAMETER[&quot;latitude_of_origin&quot;,0],
    PARAMETER[&quot;central_meridian&quot;,-117],
    PARAMETER[&quot;scale_factor&quot;,0.9996],
    PARAMETER[&quot;false_easting&quot;,500000],
    PARAMETER[&quot;false_northing&quot;,0],
    UNIT[&quot;metre&quot;,1]]</pre>So would my above example work when trying to convert this projection to EPSG:4326, or do I need to specify the source spatial reference and/or other parameters.<br><br>Thanks<br>Billy<br>