Hello Loïc
Let's keep the discussion on the list, so others can help and
benefit from responses.
BTW, you might want to post to the r-sig-geo list also. If you
come across questions specific to R and spatial functions, that's
the best place to ask.
Below,inline, some guesses as to what is happening...
On 07/07/2020 0:03, Loïc Valéry wrote:
Dear Micha,
As you expected, I should have kept a few thanks in stock ! ;-) because I have a new little problem with rgrass7 !
In fact, when I run the script that you kindly corrected me (as a reminder, our exchange of previous emails is below) , everything goes fine...the first time. If I run the script a second time, I get an error message from Windows and another one from R (see below).
For the script to work properly again I have to close and open R (or use the .rs.rstartR() command from RStudio) which is not very convenient because it stops the script.
I tried to fix this error but without success. That's why I'm contacting you, hoping you will have an idea on how to "reset" rgrass7 without having to restart a new session.
I thank you in advance for your answer and remain at your disposal if you need additional information to find the solution.
Kind regards,
Loïc
ERRORS WHEN I RUN THE SCRIPT FOR A SECOND TIME :
- FROM WINDOWS : g.region.exe : the procedure entry point GEOSMakeValid_r could not be located in the dynamic link library C:\Program Files\GRASS GIS 7.8\extrabin\gdal300.dll
- FROM R :
# Link to GRASS GIS software v.7.8.3
initGRASS(gisBase ="C:/Program Files/GRASS GIS 7.8",
+ home="temp/GRASS_tmp", use_g.dirseps.exe=F,
+ gisDbase="temp/GRASS_tmp", mapset="PERMANENT",
+ remove_GISRC=T, override=T)
Error in if (is.na(projstr)) uprojargs <- projstr else uprojargs <- paste(unique(unlist(strsplit(projstr, :
l'argument est de longueur nulle
De plus : There were 50 or more warnings (use warnings() to see the first 50)
I'm not sure, but I don't think you want to rerun initGRASS()
a second time. In your script, you do initGRASS only once,
then if you need to perform several analyses, do them in the same
(running) GRASS session.
# Specifying the projection reference for the GRASS working environment
p4str<-sp::proj4string(seg_poly)
Warning message:
In sp::proj4string(seg_poly) :
CRS object has comment, which is lost in output
execGRASS("g.proj", flags = "c", proj4 = p4str)
rgrass7::use_sp()
# Converting the 'sp' object into a GRASS-readable file format (here, 'vec1.shp')
writeVECT(seg_poly,"vec1",v.in.ogr_flags=c("o", "overwrite"),
+ driver="ESRI Shapefile")
The driver name is "ESRI_Shapefile" (note the underscore).
Perhaps that is the problem here?
Error in writeVECT(seg_poly, "vec1", v.in.ogr_flags = c("o", "overwrite"), :
driver %in% candDrivers is not TRUE
De plus : Warning message:
In system(syscmd, intern = intern, ignore.stderr = ignore.stderr, :
l'exécution de la commande 'v.in.ogr.exe -f' renvoie un statut 313
# Run the 'v.generalize' function
execGRASS("v.generalize",flag=c("overwrite"),
+ parameters=list(input="vec1",
+ output="GRASS_smooth_seg_poly",
+ error="GRASS_smooth_seg_poly_error",
+ method="distance_weighting",
+ threshold=1))
# Converting the shapefile 'GRASS_smooth_seg_poly.shp' into a R-readable object
# (here, a SpatialPolygonDataFrame named 'smooth_seg_poly')
smooth_seg_poly<-readVECT("GRASS_smooth_seg_poly", with_prj=T,
+ driver="ESRI Shapefile")
Same here, the driver name for shapefile is wrong.
I would also add that both R and GRASS have switched to the
better Geopackage format for exchanging spatial data. You might
want to try, the driver name is "GPKG"
See details about Geopackage here:
https://www.gis-blog.com/geopackage-vs-shapefile/
and in French here:
https://www.sigterritoires.fr/index.php/le-format-geopackage-et-qgis-3/
Best, Micha
Error in .read_vect_non_plugin(vname = vname, layer = layer, type = type, :
driver %in% candDrivers is not TRUE
De plus : Warning message:
In system(syscmd, intern = intern, ignore.stderr = ignore.stderr, :
l'exécution de la commande 'v.in.ogr.exe -f' renvoie un statut 313
PREVIOUS EMAILS:
De : Micha Silver
Envoyé : mardi 9 juin 2020 23:08
À : Loïc Valéry
