Many thanks Rolf! Your help is highly appreciated
since it helps me understand the clue of solving my problem.
Have a wonderful Sunday!
Jeff
δΊ 2011/11/20 15:52, Rolf Turner ει:
On 21/11/11 10:19, Zuofeng Shang wrote:
Hi Rolf,
Thanks very much for suggestions! Sorry if I made my question not v
Hi Rolf,
Thanks very much for suggestions! Sorry if I made my question not very
clear.
The context is as follows. I have a set of locations with coordinates
(latitude and longitude)
from Texas region. Some of the locations are within Texas while some of
them are not.
I am trying to find thos
On 21/11/11 10:19, Zuofeng Shang wrote:
Hi Rolf,
Thanks very much for suggestions! Sorry if I made my question not very
clear.
The context is as follows. I have a set of locations with coordinates
(latitude and longitude)
from Texas region. Some of the locations are within Texas while some
On 21/11/11 08:01, JeffND wrote:
Hi Rolf,
I have a similar question. I want to test whether a point with certain
coordinates is inside
a state, say Texas. It seems that inside.owin() only works for testing if a
point lies in a
regular region, say a polygon. Since Texas has irregular boundary, ho
Hi Rolf,
I have a similar question. I want to test whether a point with certain
coordinates is inside
a state, say Texas. It seems that inside.owin() only works for testing if a
point lies in a
regular region, say a polygon. Since Texas has irregular boundary, how do we
achieve this?
Or there is
On 2/04/2010, at 4:37 AM, Scott Duke-Sylvester wrote:
> I have a simple problem: I need to load a ERSI shapefile of US states
> and check whether or not a set of points are within the boundary of
> these states. I have the shapefile, I have the coordinates but I'm
> having a great deal of difficu
I'm currently doing a lot of simple GIS work in R, including points
in polygon queries. My .Rprofile file has
require(maptools)
require(rgdal)
With that as a starting point, I find that the data structures play
well together.
Define a coordinate reference system object with
crs.ll <-
I have a simple problem: I need to load a ERSI shapefile of US states
and check whether or not a set of points are within the boundary of
these states. I have the shapefile, I have the coordinates but I'm
having a great deal of difficulty bringing the two together. The
problem is the various GIS pa
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