Problem with assigning via run_qgis directly about rqgis

[pat-s]

@karstenv thanks for reporting your issue!

A few notes first:

• Please avoid inserting screenshots of your RStudio IDE if that does not add any value (the plot would have been sufficient but also not essential)
• Also it is more efficient to shrink down the code to lines which cause the error instead of providing your whole script. This simplifies the understanding of your issue.

Regarding your issue: You need to use load_output = con_params$OUTPUT_VECTOR instead of load_output = con_params$OUTPUT_LAYER in run_qgis. Double-check the function arguments of gdalogr::contour as returned by get_args_man().

See a full reproducible example here:

pacman::p_load(RQGIS, raster)

my_env <- set_env()
data("dem")

con_params <- get_args_man(alg = "gdalogr:contour", 
                           qgis_env = my_env)

con_params$OUTPUT_VECTOR <- file.path(tempdir(), "tz_contours1.shp")
con_params$INPUT_RASTER  <- dem
con_params$INTERVAL <- "\"200\""
con_params$FIELD_NAME <- "\"m\""

tz_200m_contours <- run_qgis(alg = "gdalogr:contour",
                             params = con_params,
                             load_output = con_params$OUTPUT_VECTOR,
                             qgis_env = my_env)

plot(dem)
plot(tz_200m_contours, add = TRUE, col = "darkred" )

[karstenv]

Hi Jannes, thanks for your notes to help me improve filing issues. >> Regarding your issue: You need to use load_output = con_params$OUTPUT_VECTOR instead of load_output = con_params$OUTPUT_LAYER in run_qgis. Double-check the function arguments of gdalogr::contour as returned by get_args_man(). Ah I see now. I did not realize at all that I had missed to replace the parameter (from a script which I used before with another procedure gdalogr:buffervectors ) params$OUTPUT_LAYER with params$OUTPUT_VECTOR . It works all now. Thanks so much and thanks for creating RQGIS in general really cool to have that ! Cheers Karsten www.terragis.net