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<div>Hi Manuel,</div>
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<div>overall we recommend to use RQGIS with the long-term release of QGIS (2.14). Nevertheless, RQGIS works also with QGIS 2.18. However, there is a bug in the QGIS Python code. Therefore, one needs to manually change the Python code. Here you find how you can do that:</div>
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<div>https://github.com/jannes-m/RQGIS#qgis-216-modifications.</div>
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<div>Regarding this issue, we have already notified the QGIS developers, and they told us that they fixed the issue. Hence, with the release of the next QGIS patch release, the manual adjustment of the Python code should no longer be necessary.</div>
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<div>Best regards,</div>
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<div>Jannes</div>
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<div style="margin:0 0 10px 0;"><b>Gesendet:</b> Mittwoch, 23. November 2016 um 20:49 Uhr<br/>
<b>Von:</b> "Manuel Spínola" <mspinola10@gmail.com><br/>
<b>An:</b> "Jannes Münchow" <malNamalJa@gmx.de><br/>
<b>Cc:</b> "r-sig-geo@r-project.org" <r-sig-geo@r-project.org><br/>
<b>Betreff:</b> Re: [R-sig-Geo] v.split.length (GRASS) in R</div>
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<div>Thank you very much Jannes.
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<div>Does the example works with QGIS 2.18 or should I do some setting in QGIS before running the code?</div>
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<div>Manuel</div>
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<div class="gmail_quote">2016-11-23 8:45 GMT-06:00 "Jannes Münchow" <span><<a href="mailto:malNamalJa@gmx.de" onclick="parent.window.location.href='malNamalJa@gmx.de'; return false;" target="_blank">malNamalJa@gmx.de</a>></span>:
<blockquote class="gmail_quote" style="margin: 0 0 0 0.8ex;border-left: 1.0px rgb(204,204,204) solid;padding-left: 1.0ex;">To achieve this, you can also use the RQGIS-package in conjunction with GRASS given you have installed QGIS along with GRASS (for more information have a look at vignette("install_guide", package = "RQGIS"):<br/>
<br/>
# construct a SpatialPointsDataFrame (which will be accepted as input by<br/>
# run_qgis)<br/>
library("sp")<br/>
# from the sp vignette:<br/>
l1 <- cbind(c(1, 2, 3), c(3, 2, 2))<br/>
rownames(l1) <- letters[1:3]<br/>
l1a <- cbind(l1[, 1] + 0.05, l1[, 2] + 0.05)<br/>
rownames(l1a) <- letters[1:3]<br/>
l2 <- cbind(c(1, 2, 3), c(1, 1.5, 1))<br/>
rownames(l2) <- letters[1:3]<br/>
Sl1 <- Line(l1)<br/>
Sl1a <- Line(l1a)<br/>
Sl2 <- Line(l2)<br/>
S1 <- Lines(list(Sl1, Sl1a), ID = "a")<br/>
S2 <- Lines(list(Sl2), ID = "b")<br/>
Sl <- SpatialLines(list(S1, S2))<br/>
# convert it to a SpatialLinesDataFrame<br/>
Sl <- SpatialLinesDataFrame(Sl, data = data.frame(1:2), match.ID = FALSE)<br/>
proj4string(Sl) <- CRS("+proj=longlat +datum=WGS84")<br/>
<br/>
# Now use RQGIS<br/>
library("RQGIS")<br/>
# indicate where QGIS is installed on your computer<br/>
qgis_env <- set_env("C:/OSGeo4W64/")<br/>
args <- get_args_man("grass7:v.split.length", qgis_env = qgis_env,<br/>
options = TRUE)<br/>
# have a look at the GRASS online help<br/>
open_help("grass7:v.split.length", qgis_env = qgis_env)<br/>
<br/>
# specify the necessary arguments<br/>
args$input <- Sl<br/>
# here length corresponds to one decimal degree<br/>
args$length <- "1"<br/>
args$output <- file.path(tempdir(), "out.shp")<br/>
# load the output directly into R again<br/>
out <- run_qgis(alg = "grass7:v.split.length", params = args,<br/>
load_output = args$output,<br/>
qgis_env = qgis_env)<br/>
length(Sl) # 2 line objects<br/>
length(out) # 9 line objects<br/>
# Have a look at the output<br/>
plot(out, col = rep(c("blue", "green", "black"), 3))<br/>
<br/>
Cheers,<br/>
<br/>
Jannes<br/>
<br/>
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<a href="https://stat.ethz.ch/mailman/listinfo/r-sig-geo" target="_blank">https://stat.ethz.ch/mailman/listinfo/r-sig-geo</a></blockquote>
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--
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<div><b>Manuel Spínola, Ph.D.</b><br/>
Instituto Internacional en Conservación y Manejo de Vida Silvestre<br/>
Universidad Nacional<br/>
Apartado 1350-3000<br/>
Heredia<br/>
COSTA RICA<br/>
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