Ah the heart of all knowledge... Philosophy!
On 3-Apr-09, at 10:24 AM, Paul Ramsey wrote:
Philosophical point:
Creating a column and filling it with a property of GEOMETRY like
ST_Area() or ST_Length() is something which makes sense in a legacy
GIS like Arc* or GRASS, where attributes are hand
Philosophical point:
Creating a column and filling it with a property of GEOMETRY like
ST_Area() or ST_Length() is something which makes sense in a legacy
GIS like Arc* or GRASS, where attributes are handled separately from
spatial. In a spatial database, where the GEOMETRY is co-equal to the
othe
PgAdmin can do it. The terminal can do it too, but i find pgAdmin more easy
to work with.
Just go to the database you are working, open a query editor and try it.
Dont forget about the considerations all the other made. The value returned
will depend on your projection.
george
On Fri, Apr 3, 20
Thank you George,
On 3-Apr-09, at 9:22 AM, George Silva wrote:
Hello Aurora,
In ArcGIS it's all different. In PostGIS you can use simple/complex
SQL queries to "calculate values" in a similar fashion of arcgis.
The simplest of them all would be, in your case:
ALTER TABLE table1 ADD COLUMN
Hi
be careful with units. This formula returns the area using projection's
units (degrees, meters, kilometers etc). If that's the case maybe convert to
some metric projetion
UPDATE table1 SET area_column = ST_AREA(ST_TRANSFORM(the_geom,
srid-of-metric-projection)); -- this returns, normally, squa
HI Kevin,
Sorry for this delayed response, when I tried the query, I am getting the
following error:
processdb=# select public.extent('POINT(0 0)');
ERROR: function public.extent("unknown") does not exist
HINT: No function matches the given name and argument types.
Aurora Geomatics wrote:
Hello PostGIS users,
I have just installed William Kyng's PostgeSQ/PostGIS packages for Mac
OS X.5
I have been playing with pgAdmin and QGIS with importing shapefiles into
PostGIS. Works dandy.
Now I am wondering how to solve Attribute Calculations.
Years of using
Hello Aurora,
In ArcGIS it's all different. In PostGIS you can use simple/complex SQL
queries to "calculate values" in a similar fashion of arcgis.
The simplest of them all would be, in your case:
ALTER TABLE table1 ADD COLUMN area_column double precision;
UPDATE table1 SET area_column = ST_AREA
Hello PostGIS users,
I have just installed William Kyng's PostgeSQ/PostGIS packages for Mac
OS X.5
I have been playing with pgAdmin and QGIS with importing shapefiles
into PostGIS. Works dandy.
Now I am wondering how to solve Attribute Calculations.
Years of using ArcGIS and GRASS it is
On Friday 03 April 2009, Stefan Schwarzer wrote:
> Hi there,
>
> I have a shapefile I would like to import into my database, but the
> shp2pgsql seems to have problems with carriage returns in the DBF:
>
> ERROR: literal carriage return found in data
> HINT: Use "\r" to represent
Hi there,
I have a shapefile I would like to import into my database, but the
shp2pgsql seems to have problems with carriage returns in the DBF:
ERROR: literal carriage return found in data
HINT: Use "\r" to represent carriage return.
What can I do about it? I don't see any
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