Merge branch 'wcsfromr' into 'master'

changed tutorial markdown/webdav_from_R.md

See merge request !1

markdown/webdav_from_R.md

@@ -4,14 +4,13 @@
 # [WebDAV](https://files.isric.org/soilgrids/data/recent/): direct access to the maps in VRT format.
 
 ### R
-**This code is tested for GDAL version 2.4.x. When running with GDAL version 3.x.x there may be problems. We are working on providing updates**
 
 #### Load libraries, select boundary box and cell size
 Initially you need to load the following libraries and select the bounding box of the area you are interested in:
 
-```R
-library(rgdal)
-library(gdalUtils)
+```{r}
+library(terra)
+library(gdalUtilities)
 bb=c(-337500.000,1242500.000,152500.000,527500.000) # Example bounding box (homolosine) for Ghana
 igh='+proj=igh +lat_0=0 +lon_0=0 +datum=WGS84 +units=m +no_defs' # proj string for Homolosine projection
 
@@ -21,13 +20,12 @@ sg_url="/vsicurl?max_retry=3&retry_delay=1&list_dir=no&url=https://files.isric.o
 #### To a geotiff in Homolosine
 This GDAL command will create a local geotiff in the Homolosine projection
 
-```R
+```{r}
 gdal_translate(paste0(sg_url,'ocs/ocs_0-30cm_mean.vrt'),
     "./crop_roi_igh_r.tif",
     tr=c(250,250),
     projwin=bb,
-    projwin_srs =igh,
-    verbose=TRUE)
+    projwin_srs =igh)
 ```
 
 #### To a geotiff in a different projection
@@ -36,30 +34,30 @@ The following commands describe a workflow to obtain a VRT or a GeoTiff for an a
 ##### To local VRT in homolosine (directly from the webdav connection)
 The first step is to obtain a VRT for the area of interest in the Homolosine projection. We suggest to use VRT for the intermediate steps to save space and computation times.
 
-```R
+```{r}
 gdal_translate(paste0(sg_url,'ocs/ocs_0-30cm_mean.vrt'),
     "./crop_roi_igh_r.vrt",
     of="VRT",tr=c(250,250),
     projwin=bb,
-    projwin_srs =igh,
-    verbose=TRUE)
+    projwin_srs =igh)
 ```
 
 ##### To a VRT in, for example, LatLong
 The following command will generate a VRT in the projection of your choice:
 
-```R
+```{r}
 gdalwarp("./crop_roi_igh_r.vrt",
     "./crop_roi_ll_r.vrt", 
-    s_src=igh, 
+    s_srs=igh, 
     t_srs="EPSG:4326", 
-    of="VRT")
+    of="VRT",
+    overwrite = TRUE)
 ```
 
 ##### To a final Geotiff
 The following command will generate a Geotiff in the projection of your choice for the area of interest defined above
 
-```R
+```{r}
 gdal_translate("./crop_roi_ll_r.vrt",  
     "./crop_roi_ll_r.tif", 
     co=c("TILED=YES","COMPRESS=DEFLATE","PREDICTOR=2","BIGTIFF=YES"))
@@ -68,14 +66,18 @@ gdal_translate("./crop_roi_ll_r.vrt",
 #### Read in R
 Finally you can read any of the generated VRTs or GeoTiffs in R for further analysis
 
-```R
-r=readGDAL("./crop_roi_igh_r.vrt") # Or any other of the files produce above
+```{r}
+rst=rast("./crop_roi_igh_r.vrt") # Or any other of the files produce above
+```
+
+​```{r}
+
+plot(rst) # Plot the file
+
 ```
-​
 
 # To download a global geotiff in Homolosine projection
-```R
+```{r}
 gdal_translate(paste0(sg_url,'ocs/ocs_0-30cm_mean.vrt'),
-    "./crop_roi_igh_r.tif",
-    verbose=TRUE)
+    "./crop_roi_igh_r.tif")
 ```