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

[Ryan R. Rosario]

*Blushes* Solved. It ended up being a dumb error on my part. Months ago, I
converted the shape files to EPSG 3310 (California Teale Albers) to match
another line file I was using but no longer need. That is why gvSIG was able
to convert the coordinates to lat/lon, because the view (location) was
projected as 3310. Using the original, untouched shape files, I have pure
lat/lon.

Which gets me to thinking... It would be great if GRASS had a similar
feature, where the user can select how the coordinates are displayed at the
bottom of the map output window (meters, feet, degrees) as a quick
reference.

R.


Ryan R. Rosario wrote:
> 
> 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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