Geographic Information Systems Asked by Emily H on February 9, 2021
I’ve been trying to download global GeoTIFF files from this Soilgrids database in Linux using this tutorial. The process seems to work, but when I try to use the files they have no associated spatial information and are essentially just pictures. I’m an undergrad who is new to coding and does not have access to ArcGIS Desktop.
Here’s the output when I run the gdalinfo function on one of the faulty GeoTIFF files:
Driver: GTiff/GeoTIFF
Files: ocs_0-5cm_mean_5000.tif
Size is 7962, 2902
Coordinate System is:
PROJCRS["Interrupted_Goode_Homolosine",
BASEGEOGCRS["GCS_WGS_1984_ellipse",
DATUM["World Geodetic System 1984",
ELLIPSOID["WGS 84",6378137,298.257223563,
LENGTHUNIT["metre",1]],
ID["EPSG",6326]],
PRIMEM["Greenwich",0,
ANGLEUNIT["Degree",0.0174532925199433]]],
CONVERSION["unnamed",
METHOD["Interrupted Goode Homolosine"]],
CS[Cartesian,2],
AXIS["(E)",east,
ORDER[1],
LENGTHUNIT["metre",1,
ID["EPSG",9001]]],
AXIS["(N)",north,
ORDER[2],
LENGTHUNIT["metre",1,
ID["EPSG",9001]]]]
Data axis to CRS axis mapping: 1,2
Origin = (-19949750.000000000000000,8361000.000000000000000)
Pixel Size = (5000.000000000000000,-5000.000000000000000)
Metadata:
AREA_OR_POINT=Area
Code_version=v2.0.0
Covariates=clm_wcl_srdyrsum,clm_wcl_s04rad,clm_wcl_p10tot,veg_mod_eviyravg,clm_wcl_p09tot,veg_mod_nppy15, mor_env_demm,clm_wcl_s08rad,clm_wcl_srdyrstd,clm_wcl_s07rad,clm_wcl_bio19,clm_wcl_p05tot,clm_wcl_bio17,mo r_mrg_twi,clm_mod_lstd03std,clm_mod_lstd04std,clm_wcl_bio16,clm_wcl_bio08,clm_mod_lstd09std,clm_mod_lstd1 1std,clm_wcl_bio18,mor_mrg_vdp,clm_wcl_p04tot,clm_mod_lstd05std,clm_mod_lstd12std,clm_mod_lstd10std,clm_m od_lstd02std,clm_wcl_p12tot,clm_mod_lstd01std,veg_mod_evient,veg_mod_evirng,veg_mod_evimax,veg_mod_evievn ,luc_gfc_trely10,mor_mrg_vbf
Litter_layers=FALSE
Model=Quantile Regression Forests
Model_type=ranger
Mtry=15
Number_trees=200
Outputs_version=RUN03
WoSIS_version=Data stream 7
Image Structure Metadata:
COMPRESSION=DEFLATE
INTERLEAVE=BAND
Corner Coordinates:
Upper Left (-19949750.000, 8361000.000)
Lower Left (-19949750.000,-6149000.000)
Upper Right (19860250.000, 8361000.000)
Lower Right (19860250.000,-6149000.000)
Center ( -44750.000, 1106000.000) ( 0d51'53.55"W, 9d56' 7.32"N)
Band 1 Block=256x256 Type=Int16, ColorInterp=Gray
NoData Value=-32768
Using the url below.
https://maps.isric.org/mapserv?map=/map/ocs.map&SERVICE=WMS&VERSION=1.3.0&REQUEST=GetMap&BBOX=-19948500.0,-6147449.0951699,19688885.757062882,8361000.0&CRS=EPSG:152160&WIDTH=1426&HEIGHT=895&LAYERS=ocs_0-30cm_mean&STYLES=&FORMAT=application/openlayers
This can be easily loaded into QGIS (Windows/Linux/Mac)
Then export the area of interest you require as a GeoTiff
Answered by Mapperz on February 9, 2021
You have do have spatial information on your file, on your post you have the following information:
Coordinate System is:
PROJCRS["Interrupted_Goode_Homolosine",
BASEGEOGCRS["GCS_WGS_1984_ellipse",
:
:
Origin = (-19949750.000000000000000,8361000.000000000000000)
Pixel Size = (5000.000000000000000,-5000.000000000000000)
This is the minimal spatial information information necessary for you to work with the file. The file is in Goode Homolosine projection
, as indicated on the Soilgrids FAQ - How can I use the Homolosine projection.
You can then transform the geotiff from the Goode Homolosine projection into EPSG:4326 using gdalwrap
or gdal_translate
gdalwarp -t_srs EPSG:4326 input.tif output.tif
This information concern projection transformation is indicated on the soilgrids tutorial.
Hope this helps, the proposed solution of Mapperz is also a good way to get the maps, with the extra bonus of not requiring ArcGIS
Answered by Jorge Mendes on February 9, 2021
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