On Mon, 17 May 2010, Agustin Lobo wrote:
Roger,
There is actually information in the file, i.e. the first point is:
<?xml version="1.0"?>
<gpx version="1.1" creator="GDAL 1.6.3"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
xmlns:ogr="http://osgeo.org/gdal"; xmlns="http://www.topografix.com/GPX/1/1";
xsi:schemaLocation="http://www.topografix.com/GPX/1/1
http://www.topografix.com/GPX/1/1/gpx.xsd";>
<wpt lat="41.800745980899059" lon="2.359550956673553">
<extensions>
<ogr:Comentario>4</ogr:Comentario>
<ogr:Rcvr_Type>Juno ST</ogr:Rcvr_Type>
<ogr:GPS_Date>2009/10/27</ogr:GPS_Date>
<ogr:GPS_Time>03:09:11pm</ogr:GPS_Time>
<ogr:Datafile>AILANTO27102009.SSF</ogr:Datafile>
<ogr:GPS_Height>1089.392</ogr:GPS_Height>
<ogr:Northing>4627933.603</ogr:Northing>
<ogr:Easting>446791.833</ogr:Easting>
<ogr:PDOP_max>0</ogr:PDOP_max>
<ogr:HDOP_max>0</ogr:HDOP_max>
<ogr:Fecha_GPS>0000/00/00</ogr:Fecha_GPS>
<ogr:PosNofilt>0</ogr:PosNofilt>
<ogr:Pos_filt>0</ogr:Pos_filt>
<ogr:Semana_GPS>0</ogr:Semana_GPS>
<ogr:Segundo_GP>0</ogr:Segundo_GP>
<ogr:Altura_GPS>0</ogr:Altura_GPS>
<ogr:Prec_vert>0</ogr:Prec_vert>
<ogr:Prec_horz>0</ogr:Prec_horz>
<ogr:Dev_Tp>0</ogr:Dev_Tp>
<ogr:Norte>0</ogr:Norte>
<ogr:Este>0</ogr:Este>
<ogr:Abundancia>4</ogr:Abundancia>
</extensions>
</wpt>
Cannot read it in R. Maybe I'm not using the appropriate settings for dsn
and layer (I've tried
many alternatives):
The variants are as described in the readOGR help file, that is layer=
"waypoints", "tracks", "routes", "track_points", or "route_points". Maybe
reading the help page might save time??
Roger
PS. I think that the OGR GPX driver expects a number of fields that are
most often absent when reading (so generating NULL/NA), and may not handle
other extra user-defined fields gracefully. If need be, create a short
string in the NAME or name field to concatenate the data you need, that is
work around apparent shortcomings in the driver.
writeOGR(AilantMSY09WGS84LL,
dsn="/media/TRANSCEND/MONTSENY2008/MONTSENY_GEODATA/FloraExotica2009/AilantMSY09R.gpx",layer="AilantMSY09R",driver="GPX",dataset_options="GPX_USE_EXTENSIONS=YES")
test <-
readOGR(dsn="/media/TRANSCEND/MONTSENY2008/MONTSENY_GEODATA/FloraExotica2009/AilantMSY09R.gpx",layer="AilantMSY09R")Error
in ogrInfo(dsn = dsn, layer = layer, input_field_name_encoding =
input_field_name_encoding) :
Cannot open layer
Agus
--
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: roger.biv...@nhh.no
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