Good Evening
My thanks to Carson and Colin for their helpful suggestions.
Joe
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Good Afternoon:
I have spent a good part of today searching the discussion list and reading
"Applied Spatial Data Analysis with R" and can't seem to find how to do the
following:
One of my colleague's grad students has two shapefiles. The first shapefile
contains local polygons with ass
Good Afternoon
Does any one know of a package/function that could be used to compute the
square kilometers for polygons in a long-lat projected shapefile?
I can access the values in the "area" slots in the object resulting from using
maptool's "readShapePoly" command. I have approximated the k
Roger
Thanks once again for your assistance. Your code did exactly what I was wanting
to do.
I was able to export the spatial dataframe as a shapefile and use it in my
application.
Joe
-Original Message-
From: Roger Bivand
To: brwin...@aol.com
Cc: r-sig-geo@stat.math.ethz.ch
Sent: Th
Good Evening:
I have been trying to figure this one out but just can't make it work yet.
Is there a straightforward way to convert a grid object (such as an earthwide
or regional long-lat grid) generated using sp into a spatial polygon object
that I could then export as a shapefile. I want to
Good Afternoon
Does R have the ability to let me have access to the gridded data values
for the following data?
We downloaded the zipped file containing the data sets but are not familiar
with how to read the data in R.
Thanks
Joe
###
Roger
Thank you for the code. I will be experimenting with it this week.
Joe
Barry
I have downloaded and experimented with Quantum GIS. I am impressed but
have not quite been able to delete the desired shapes yet. I have been able
to edit and delete entire polygons but am struggling with
Good Morning:
I would like to edit the county warning area boundaries shapefile
"w_15jl09.shp" downloaded from:
_http://www.weather.gov/geodata/catalog/wsom/html/cwa.htm_
(http://www.weather.gov/geodata/catalog/wsom/html/cwa.htm)
Several of the shapefile's polygons contain extremely small "holes"
Good Morning:
I need to construct a set of Thiessen Polygons centered around
approximately 4500 longlat positions in the US. After searching the R site, I
was
going to attempt to use the arealsubPolygons function in the hydrosanity
package. I am using a Windows system.
When attemptin
Torleif
Thanks for replying to my post and for the code. I have been getting a
number of useful suggestions
and am attempting to modify your code to address my particular problem. I
will be letting everyone know
how this comes out.
Have a great week.
Joe
In a message dated 5
Jean-Paul
If I understand your questions, imposing your restrictions on the
predicted values
and on sums (or even using weighted sums where each observation in the
"sum"
does not receive equal weight) of linear combination of subsets of the
columns of
X is not difficult. Sets of the result
Greetings
I have a large number of long-lat locations dispersed over the US and need
to identify which US county that each point is located in (or nearest to).
After reading the past posts and Roger's book, I have been able to use the
overlay function
to identify the appropriate count
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