WGI 2012
Description
World Glacier Inventory, Version 1
The World Glacier Inventory (WGI) represents a a snapshot of the glacier distribution in the second half of the 20th century. It contains information for over 130,000 glaciers, based primarily on aerial photographs and maps, most glaciers have a single data entry. It is based on the World Glacier Monitoring Service (WGMS 1989).
Citation
WGMS, and National Snow and Ice Data Center (comps.). 1999, updated 2012. World Glacier Inventory, Version 1. [Indicate subset used]. Boulder, Colorado USA. NSIDC: National Snow and Ice Data Center. doi: https://doi.org/10.7265/N5/NSIDC-WGI-2012-02. [Date Accessed].
Data access
Available at: ftp://sidads.colorado.edu/pub/DATASETS/NOAA/G01130/
Data download and preparation
source ~/proyectos/CES/cesdata/env/project-env.sh
DPATH=cryosphere/global
DNAME=WGI_2012
mkdir -p $GISDATA/$DPATH/$DNAME/
cd $GISDATA/$DPATH/$DNAME/
wget --continue ftp://sidads.colorado.edu/pub/DATASETS/NOAA/G01130/wgi_shapefile_feb2012.zip
We import this dataset in postgis for further data preparation and selection
psql gisdata jferrer -c "CREATE SCHEMA wgi"
ogr2ogr -f "PostgreSQL" PG:"host=localhost user=jferrer dbname=gisdata" -lco SCHEMA=wgi -nlt PROMOTE_TO_MULTI $GISDATA/inventories/WGI_2012/wgi_shapefile_feb2012.shp WGI_2012
This way we can summarize information according to documented variables, for example:
SELECT prim_class,count(*) as nr from wgi.wgi_shapefile_feb2012 group by prim_class;
En el que ''prim_class'' es una de las siguientes:
| Code | Name | Description |
|---|---|---|
| 0 | Miscellaneous | Any type not listed below. |
| 1 | Continental Ice Sheet | Inundates areas of continental size. |
| 2 | Ice Field | Ice masses of the sheet or blanket type with a thickness that is insufficient to obscure the subsurface topography. |
| 3 | Ice Cap | Dome-shaped ice masses with radial flow. |
| 4 | Outlet Glacier | Drains an ice sheet, ice field, or ice cap, usually of valley glacier form; the catchment area may not be easily defined. |
| 5 | Valley Glacier | Flows down a valley; the catchment area is well defined. |
| 6 | Mountain Glacier | Cirque, niche type, crater type, or hanging glacier; also includes ice aprons and groups of small units. |
| 7 | Glacieret and Snowfield | Small ice masses of indefinite shape in hollows, river beds, or on protected slopes that have developed from snow drift, avalanches, and/or particularly heavy accumulation in certain years. Usually no marked flow pattern is visible; and it has been in existence for at least two consecutive years. |
| 8 | Ice Shelf | Floating ice sheet of considerable thickness attached to a coast nourished by a glacier or glaciers; snow accumulation on its surface or bottom freezing. |
| 9 | Rock Glacier | Lava-stream-like debris mass containing ice in several possible forms and moving slowly downslope. |