[GRASS-user] Trouble with ESRI TIGER/LINE Files and Coordinate System

[Ryan R. Rosario]

Ugh. The LINESTRINGs contain the weird coordinates (in the 100000s), not raw
lat/lon.

Extent: (-59948.354015, -457156.354302) - (51189.384222, -322776.485268)

QGIS also uses the weird coordinates as well. gvSIG did as well, until I
changed the measurement unit to "degree." It's GUI for map display is very
similar to QGIS. Is there a such thing switching measurement units to
degrees in GRASS? ;-)

Unfortunately, there is no PRJ file with these shapefiles, which is really
frustrating. The website claims they are NAD83 lat/lon decimal degrees. My
region should be 119W to 121W and 34N to 36N. Could these be UTM
coordinates?? 

R.



hamish_b wrote:
> 
> can you check with ogrinfo what's *really* in the shapefile?
> 
>    ogrinfo -ro -al mapname.shp
> 
> That will dump a huge amount of stuff to the terminal (^C to kill it)
> but you should see LINESTRING with a comma separated list of coordinates.
> 
> Are those raw coordinates in lat/lon or ...?
> 
> what does the shapefile.prj look like?
> 
> 
> I am not too familiar with gvSIG's capabilities; will QGIS load it and
> show correct projection info and mouse-over coords on the bottom status
> line?
> 
> 
> Hamish
> 

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