define projection, drg's

[AimeeSalstead]

I have DRG's that have been converted from .tif to SID files and have no metadata associated with them.  I am trying to get the files into a proper projection so that I can pull lat/long's off of the image in specific locations. I'm having a hard time figuring out how the files are set up so that I can correctly project them.  I believe I need the files in  NAD 1927 UTM Zone 5N.  If I go back to the metadata listed on the usgs website, the file should have the following spatial extent...
Transverse_Mercator:
Scale_Factor_at_Central_Meridian: 0.9996

Longitude_of_Central_Meridian: -153.000

Latitude_of_Projection_Origin: 0.0

False_Easting: 500000.

False_Northing:
0.0

The files are too big to upload here but if anyone is able to help I would be happy to send one your way.
Thanks,

Aimee

[JeffreySwain]

Since the files are in sid format now, I would recommend georeferencing the sids rather than trying to adjust the metadata.  It sounds like, per your description, that in the conversion process the spatial reference was lost.  Is that correct? When you look at the properties of the sid, do you see any custom extents?  If you see the same extents from the .tif, then all you will need to do is define the sid's projection with the Define Projection tool.  If you see bad extents in the source properties, then I would recommend georeferencing the sid.  That way you preserve the compression of the sid and then put it in the correct location.  I am including the information on how to georeference the raster, but basically, you should follow these basic steps.

1. Open a new MXD
2. Define the coordinate system you want to georeference the raster to
3. Add in any corresponding reference data in that same coordinate system
4. Georeference the raster by adding control points
5. Update the georeferencing