having 12 files with 12 hdrs for one year: these files are raster (projected WGS84,lat long):https://echange-fichiers.inra.fr/get?k=rLSyoavrnifGyH5XrlO samples = 1440 lines = 720 bands = 1 header offset = 0 file type = ENVI Standard data type = 4 interleave = bsq byte order = 0 map info = { Geographic Lat/Lon, 1, 1, -180, 90, 0.25, 0.25,WGS-84} coordinate system string = GEOGCS["GCS_WGS_1984",DATUM["D_WGS_1984", SPHEROID["WGS_1984",6378137,298.257223563]] ,PRIMEM["Greenwich",0],UNIT["Degree",0.017453292519943295]] } These lines will open the files as a list: a<-list.files("D:\\ECV\\2010", "*.envi", full.names = TRUE) for(i in 1:length(a)){ d <- raster(a[i]} I would like to extract the values correspond to 44.8386? N, 0.5783? W from all files as txt file -- View this message in context: http://r.789695.n4.nabble.com/how-to-extract-values-from-a-raster-according-to-Lat-and-long-of-the-values-tp4656767.html Sent from the R help mailing list archive at Nabble.com.
how to extract values from a raster according to Lat and long of the values?
5 messages · Pascal Oettli, jim holtman, Jonsson
?extract HTH Pascal Le 27/01/2013 22:53, Jonsson a ?crit :
having 12 files with 12 hdrs for one year: these files are raster (projected WGS84,lat long):https://echange-fichiers.inra.fr/get?k=rLSyoavrnifGyH5XrlO samples = 1440 lines = 720 bands = 1 header offset = 0 file type = ENVI Standard data type = 4 interleave = bsq byte order = 0 map info = { Geographic Lat/Lon, 1, 1, -180, 90, 0.25, 0.25,WGS-84} coordinate system string = GEOGCS["GCS_WGS_1984",DATUM["D_WGS_1984", SPHEROID["WGS_1984",6378137,298.257223563]] ,PRIMEM["Greenwich",0],UNIT["Degree",0.017453292519943295]] } These lines will open the files as a list: a<-list.files("D:\\ECV\\2010", "*.envi", full.names = TRUE) for(i in 1:length(a)){ d <- raster(a[i]} I would like to extract the values correspond to 44.8386? N, 0.5783? W from all files as txt file -- View this message in context: http://r.789695.n4.nabble.com/how-to-extract-values-from-a-raster-according-to-Lat-and-long-of-the-values-tp4656767.html Sent from the R help mailing list archive at Nabble.com.
______________________________________________ R-help at r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
How do you get those values from the example header file that you included?
On Sun, Jan 27, 2013 at 9:15 PM, Pascal Oettli <kridox at ymail.com> wrote:
?extract HTH Pascal Le 27/01/2013 22:53, Jonsson a ?crit :
having 12 files with 12 hdrs for one year: these files are raster (projected WGS84,lat long):https://echange-fichiers.inra.fr/get?k=rLSyoavrnifGyH5XrlO samples = 1440 lines = 720 bands = 1 header offset = 0 file type = ENVI Standard data type = 4 interleave = bsq byte order = 0 map info = { Geographic Lat/Lon, 1, 1, -180, 90, 0.25, 0.25,WGS-84} coordinate system string = GEOGCS["GCS_WGS_1984",DATUM["D_WGS_1984", SPHEROID["WGS_1984",6378137,298.257223563]] ,PRIMEM["Greenwich",0],UNIT["Degree",0.017453292519943295]] } These lines will open the files as a list: a<-list.files("D:\\ECV\\2010", "*.envi", full.names = TRUE) for(i in 1:length(a)){ d <- raster(a[i]} I would like to extract the values correspond to 44.8386? N, 0.5783? W from all files as txt file -- View this message in context: http://r.789695.n4.nabble.com/how-to-extract-values-from-a-raster-according-to-Lat-and-long-of-the-values-tp4656767.html Sent from the R help mailing list archive at Nabble.com.
______________________________________________ R-help at r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
______________________________________________ R-help at r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Jim Holtman Data Munger Guru What is the problem that you are trying to solve? Tell me what you want to do, not how you want to do it.
jholtman: I do not understand you question? -- View this message in context: http://r.789695.n4.nabble.com/how-to-extract-values-from-a-raster-according-to-Lat-and-long-of-the-values-tp4656767p4656847.html Sent from the R help mailing list archive at Nabble.com.
extract will extract values if you provide the x , y but then who to know which lat and long correspond to which x and y -- View this message in context: http://r.789695.n4.nabble.com/how-to-extract-values-from-a-raster-according-to-Lat-and-long-of-the-values-tp4656767p4656848.html Sent from the R help mailing list archive at Nabble.com.