The datasets from worldclim contain projections of minimum, maximum temperature and precipitation.
Anyone know how to read these datasets using Quantum GIS (QGIS)?
The file format is GeoTIFF.
Download the files, uncompress them and you will get a collection of TIFF files. Then, open QGIS and follow the documentation on "loading raster data in QGIS" (http://docs.qgis.org/2.2/en/docs/user_manual/working_with_raster/supported_data.html).
After that, you may click with the information tool on a point in the map to get the value, and you may change the visualization style (http://docs.qgis.org/2.2/en/docs/user_manual/working_with_raster/raster_properties.html) or you may perform spatial analysis on the data (http://docs.qgis.org/2.2/en/docs/user_manual/working_with_raster/raster_calculator.html)
Hi Miguel,
After compressing the file (say the minimum temperature), there were 9 GeoTIFF files for the minimum temperature.
Shall I open all GeoTIFF files ?
I only interest on a specific location not all around the world
The ZIP files with climate element data contain 12 data layers (one for each month); the bioclimatic ZIP file contains 19 data layers; and the altitude ZIP file contains one layer.
More details at:
http://www.worldclim.org/formats
In order to choose your specific location you may download the data by tile from:
http://www.worldclim.org/tiles.php
cheers, Kostas
hi kostas,
thanks for your tip.
I'm doing climate projections so I may not need data from http://www.worldclim.org/tiles.php.
Please give me advice on the files of climate projections
Future conditions (projections) are downscaled Global climate model (GCM) data; Which means you have to download the global data.
Then you may clip the area that you want with QGIS. To do so:
1. load the GeoTIFF file that you want
2. from the "Raster" menu choose "Extraction" -> "Clipper"
3. select the area by drag on canvas. I usually correct the numbers in the x,y boxes, in order to always have the same extent.
cheers, Kostas
Hi Kostas,
Thanks for your answers.
I downloaded climate projections from www.worldclim.org
I unzipped file minimum temperature and I got 12 files GeoTIFF.
As I want to see temperature in a specific location, shall
I open 12 GeoTIFF files in QGIS ?
Cheers,
As I noted before the 12 files correspond one for each month of the year.
Thus, xxx01.tif is for January
xxx02.tif for February
..................
xxx12.tif for December
Therefore, the file(s) that you will use (open) depend on the analysis that you want to do.
cheers, Kostas
hi,
when I used point click in any area, it can display any climatic values.
but I need climatic from specific climate stations, what shall I do?
again, is it possible to look climatic values for all month with one click ?