James,
Looking at -
http://webhelp.esri.com/arcgiSDEsktop/9.3/index.cfm?TopicName=How%20Point%20Density%20works
. Why not convert the raster cell centers to points , do a query on the
point layer for a square centered on the raster derived point whose
dimensions are given by the
Thanks for the reference Doug. What you suggest does sound like it could
work, the only thing is that
I would need to have this output as a Raster as I am then looking to use
it
with two other rasters
to do a weighted combination of them e.g. [rast1 * 0.2] + [rast2 * 0.5] +
?[rast3 * 0.3].
Do
Discussions on 32 bit vs 64 bit Postgresql:
http://archives.postgresql.org/pgsql-performance/2004-11/msg00201.php
http://postgresql.1045698.n5.nabble.com/64-bit-vs-32-bit-performance-backwards-td2057238.html
See document on 5 steps to postgresql performance by Josh Berkus:
When you use the windows installer for 9.1, it gives you the option of
installing 1.5.3 in the stackbuilder followup. I'n theory, that's what I
just did on my winxp box :-).
Doug
Doug Newcomb
USFWS
Raleigh, NC
919-856-4520 ext. 14 doug_newc...@fws.gov
Paul,
Just a question about the meeting at 2:30 on Wed. Do you have a
location yet?
Doug
Doug Newcomb
USFWS
Raleigh, NC
919-856-4520 ext. 14 doug_newc...@fws.gov
-
The opinions I
Apologies to the list. Please disregard.
Doug
Doug Newcomb
USFWS
Raleigh, NC
919-856-4520 ext. 14 doug_newc...@fws.gov
-
The opinions I express are my own and are not representative of the
Sheara,
That would depend on the shape of the polygon. A polygon in the
shape of a C would have a centroid point inside the curve of the C,
but not inside the polygon. Perhaps you want to find the centroid first
and then find the closest point on the polygon boundary to that point (
Balint
Would using the geography data type be more suitable to what you are
trying to accomplish?
http://postgis.refractions.net/docs/ch04.html#PostGIS_GeographyVSGeometry
Doug Newcomb
USFWS
Raleigh, NC
919-856-4520 ext. 14 doug_newc...@fws.gov
Radu,
I am somewhat confused. From my somewhat limited understanding of
EPSG:4326 it's limited to values between 180, -180 for longitude and
90,-90 for latitude. If your source geometry is epsg:4326, there should
not be values outside of those limits. Are you wrapping around those
Doug,
There are cases where we need to use a difference branch of longitude
values, e.g. 0 to 360, rather than -180 to 180. For example, if one has a
polygon that spans the international dateline, and one uses longitude
from -180 to 180, some vertices of the polygon will have longitudes near
Hi,
I'm working on a complex PostgreSQL / Postgis-Database with 200
tables.
At this time there is no good documentation for the database so I'm
searching for a OpenSource / cheap database-documentation software that
creates the table/field structure and relations/ERdiagram to a open
format
Regina,
1) How you use PostGIS?
Storage and analysis of fisheries and endangered species data.
2) What you find useful about it over anything else?
Fast, Standards Compliant, straightforward
3) Why you think there should be any book written focused on its use and of
course if such a thing were
Stephen,
Australia encompasses UTM zones 49 to 56,
http://www.dmap.co.uk/utmworld.htm . If you tried to use UTM zone 53 for
everything you would have EXTREME distortion at the edges. You get
noticable distortion when you overlap significantly even into adjoining UTM
zones.
For an
Dana,
From what I recall of the Itanium family of processors, it is a
pure 64 bit processor which does software emulation of a 32 bit x86
environment for 32 bit x86 binaries. I also remember that the performance
of this 32 bit x86 emulation method was somewhat lacking. AMD came out
with
Postgresql 8.2.4 + postgis 1.2.1 + geos 3.0 RC4 is working fine on Centos 5
64 bit so far.
Doug
Doug Newcomb
USFWS
Raleigh, NC
919-856-4520 ext. 14 [EMAIL PROTECTED]
-
The opinions I express
15 matches
Mail list logo
