how to call latest maptools' internal functions on R fowin on XP
Sorry, I've remembered using namespace like this,
----- Original Message -----
From: "Hisaji ONO" <hi_ono2001 at ybb.ne.jp>
Cc: <r-sig-geo at stat.math.ethz.ch>
Sent: Thursday, August 05, 2004 6:38 AM
Subject: [R-sig-Geo] how to call latest maptools' internal functions on R
fowin on XP
> Hello, Professor Bivand.
> Last year, I've asked how to call maptools' internal functions, read.dbf
> and write.dbf on R for Win.
> A couple months ago, unfortunately my PC's HDD was crushed and your mails
> were gone.
> Could you tell me how to do this if possible?
Hello, I am slowly coming up to speed with S4 classes and the approach
to spatial data in sp and pixmap. I see the comments in
"Class-SpatialData.R" alluding to conversion between pixmap and
SpatialDataGrid, and I'm wondering what the master plans (if any)
are. Is pixmap intended to extend class SpatialData? Are there
bigger ideas afoot? I'm thinking along the lines of Roger Bivand's
Date: Mon, 28 Jun 2004 11:02:49 +0200 (CEST)
Subject: Re: [R-sig-Geo] Where is the Changelog of maptools?
about the intentions to include read shapefiles into an S4 class. Is there
something I'm missing in terms of documented goals and plans?
Are there plans to add coordinate system metadata (i.e. CRS) to
I'm interested in learning more (and hopefully helping develop) the spatial
capability in R. I have a particular (side) interest in running Manifold GIS
from R and vice versa, and I have some simple and ad hoc 'tight' and also
'loose' couplings between them. See
Hello, does anyone know about "storing geometry in tables" using binary
record types? Manifold GIS 6.00 http://www.manifold.net supports the
storage of drawing object (points, lines and areas) coordinates in tables -
using a binary "Geometry" type. Geometry can be stored in databases (or
other tables supporting the binary Geom format such as .mdb).
These binary records can be accesed by SQL queries within Manifold
I.e. SELECT Geom(ID) AS [Geom], [Drawing].* FROM [Drawing]; results in
a table like:
<geom, area, branches: 1, coords: 10> 6 Area 1 10 -156.579937304075
These drawing objects can be reconstructed simply by importing or linking
to the table.
This makes Manifold a very powerful tool for manipulating vector data on
Apparently there are "Geometry (SHP)" and "Geometry (WKB)" (well-known binary)
for ESRI geodatabases and OpenGIS respectively. Does anyone know how to read
such binary records using generic tools, like R?
I can already read table data from Manifold projects using RODBC, extending
binary "Geometry in tables" could be very powerful.
Michael Sumner - PhD. candidate
Maths and Physics (ACE CRC & IASOS) and Zoology (AWRU)
University of Tasmania
Private Bag 77, Hobart, Tas 7001, Australia
Phone: 6226 1752