Here it is:
Hello,
How can I construct an sf polyline object directly in sf? I have a
data frame with 3 pairs of coordinates and need for each row a 2
segment line.
I did it with sp but would like to migrate to sf:
dput(head(base))
structure(list(Cuenca = c("NA", "NA", "NA", "NA", "NA", "NA"),IDH =
c("AL011851", "AL011851", "AL011851", "AL011851",
"AL011851","AL011851"), W = c(80L, 80L, 80L, 80L, 70L, 60L), LAT1 =
c(28,28, 28.05, 28.15, 28.2, 28.25), LONG1 = c(-95.1, -95.7,
-96.25,-96.65, -96.9, -97.3), LAT3 = c(28, 28.05, 28.15, 28.2,
28.25,28.35), LONG3 = c(-95.7, -96.25, -96.65, -96.9, -97.3, -97.95),
LAT2 = c(28, 28, 28.1, 28.2, 28.2, 28.3), LONG2 = c(-95.4,-96, -96.5,
-96.8, -97, -97.6), Resid = c(6, 6, 4.5, 3, 4.5,6)),row.names = c(NA,
6L), class = "data.frame")
base$ID<-seq(1,nrow(base),1)
base_lines <- apply(base,1,function(x){
points <- data.frame(lng=as.numeric(c(x["LONG1"],x["LONG2"],x["LONG3"])),lat=as.numeric(c(x["LAT1"],x["LAT2"],x["LAT3"])),stringsAsFactors
= F)
coordinates(points) <- c("lng","lat")
Lines(Line(points),ID=as.numeric(x["ID"]))})
row.names(base) <- base$ID
base_lines <- SpatialLinesDataFrame(SpatialLines(base_lines),base)
sflines<-st_as_sf(base_lines)
Le jeu. 30 juin 2022 ? 08:51, Ben Tupper <btupper at bigelow.org> a ?crit :
Hi,
Hmmm... I think I can see what you are trying, but the mailing list
mangles HTML messages (switch your email to client to plain text mode
for this list). Mifght you share what you get when you run,
dput(head(base))
in R? That way each of us would have a small sample of your data.
And also resend the code to the list in plain text so we don't have to
to yoga moves to read the code?
Best wishes,
Ben
On Thu, Jun 30, 2022 at 9:30 AM David Romero <rodaromero at gmail.com> wrote:
Hello,
How can I construct an sf polyline object directly in sf? I have a data
frame with 3 pairs of coordinates and need for each row a 2 segment line.
I did it with sp but would like to migrate to sf:
base$ID<-seq(1,nrow(base),1)
base_lines <- apply(base,1,function(x){
points <- data.frame(lng=as.numeric(c(x["LONG1"],x["LONG2"],x["LONG3"])),
lat=as.numeric(c(x["LAT1"],x["LAT2"],x["LAT3"])),stringsAsFactors = F)
coordinates(points) <- c("lng","lat")
Lines(Line(points),ID=as.numeric(x["ID"]))})
row.names(base) <- base$ID
base_lines <- SpatialLinesDataFrame(SpatialLines(base_lines),base)
sflines<-st_as_sf(base_lines)
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