On Mon, 10 Mar 2008, Jaros?aw Jasiewicz wrote:
Hi
I try to read vector line file with following 775 lines:
v.info results:
+----------------------------------------------------------------------------+
| Layer:
[EMAIL PROTECTED] |
| Mapset:
trzy_mapy |
| Location:
polska |
| Database:
/home/jarekj/grassdata |
|
Title: |
| Map scale:
1:1 |
| Map format:
native |
| Name of creator:
jarekj |
|
Organization: |
| Source date: Mon Mar 10 16:03:03
2008 |
| ----------------------------------------------------------------------------|
| Type of Map: vector (level:
2) |
|
|
| Number of points: 0 Number of areas:
0 |
| Number of lines: 775 Number of islands:
0 |
| Number of boundaries: 0 Number of faces:
0 |
| Number of centroids: 0 Number of kernels:
0 |
|
|
| Map is 3D:
0 |
| Number of dblinks:
1 |
|
|
| Projection: Transverse
Mercator |
| N: 470423.4220965 S:
429940.9545465 |
| E: 561987.1623495 W:
539556.8766255 |
|
|
| Digitization threshold:
0 |
|
Comments: |
|
|
+----------------------------------------------------------------------------+
........
Geospatial Data Abstraction Library extensions to R successfully loaded
v=readVECT6("zb", type="line")
The help page gives a relevant example. The problem is the possible
existence of duplicates in the accompanying data frame. If there are known
to be no duplicates, or it does not matter, use remove.duplicates=FALSE
and then the final step assembling (lines or) polygons will not be carried
out. There is a bug too, but I think that for your case, setting the
argument will be a better resolution.
Please let me know if this helps,
Roger
Exporting 775 points/lines...
100%
775 features written
OGR data source with driver: ESRI Shapefile
Source: "/home/jarekj/grassdata/polska/trzy_mapy/.tmp/jarekj-desktop", layer:
"zb"
with 775 rows and 1 columns
Error in Polygons(srl, ID = IDss[i]) : srl not a list of Polygon objects
ls()
character(0)
why polygon????????
Jarek
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--
Roger Bivand
Economic Geography Section, Department of Economics, Norwegian School of
Economics and Business Administration, Helleveien 30, N-5045 Bergen,
Norway. voice: +47 55 95 93 55; fax +47 55 95 95 43
e-mail: [EMAIL PROTECTED]
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