Database for Task 2 (DBT2) Technical Note Prepared by: Glaciers_cci consortium Contract: 4000101778/10/I-AM Name: Glaciers_cci-DBT2-TN Version: 1.0 Date: 11.12. 2011 Contact: Frank Paul Department of Geography University of Zurich Winterthurerstr. 190 CH-8057 Zurich [email protected]Technical Officer: Stephen Plummer ESA ESRIN
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Version Date Changes Approval 0.9 05.12.2011 Draft 1.0 09.12.2011 All modifications by project partners incorporated
The work described in this document was done under ESA contract 21088/07/I-EC. Responsibility for the contents resides in the authors that prepared it. Author team: Thomas Nagler, Helmut Rott, Kilian Scharrer (ENVEO), Tazio Strozzi (Gamma), Andrew Shepherd, Francesca Ticconi (SEEL), Frank Paul, Tobias Bolch, Nico Mölg (GIUZ), Andreas Kääb, Chris Nuth (GUIO) Glaciers CCI Technical Officer at ESA: Stephen Plummer
1. Purpose of the database............................................................... 4
2. Access to the database ................................................................. 4
3. Structure of the database ............................................................ 5 3.1. Database for glacier area...........................................................................................6
3.2. Database for elevation change...................................................................................8
3.3. Database for glacier velocity ...................................................................................13
This document gives an overview of the Database for Task 2 (DBT2) within the Glaciers_cci project. The database includes all datasets collected by the Glaciers_cci consortium that are required for product validation and the round robin exercises (RR). Analysis of the round robin results and their comparison to validation data will be performed internally. The RR participants will be provided with all Earth Observation (EO) and auxiliary datasets necessary for generating the respective dataset, the validation data will in general not be distributed. This approach will ensure that the analysis of the RR will be conducted under the same conditions and follow consistent guidelines for all products. Furthermore, this avoids copyright issues with data held by consortium members (e.g. high resolution national DEMs). For the glacier area product however, some validation datasets will be made available as well (high-resolution satellite images), as they are based on screenshots from Google Maps. Freely available datasets like ICESat GLAS and Envisat RA2 altimetry data, or the ASTER GDEM Version 2 (GDEMv2) and the SRTM Version 2 digital topographic data are not stored in the Glaciers_cci database. For quick access to these public data, links pointing to the distribution centres are provided respectively.
2. Access to the database
The database is available for the Glaciers_cci consortium as well as for authorised round robin participants under:
http://glacier_cci.enveo.at All data approved for the round Robin tests can be downloaded via this interface. The current size of the database is 41.1 GB. User authorisation is required for accessing the database in order to track the distribution of the data. For access to the database and participant registration, the scientific lead has to be contacted by email:
The database follows a logical structure organized by the individual products and test sites. This ensures an easy modification or expansion of the database to changes that might occur in the course of the project. Fig. 1 illustrates the general structure schematically.
Fig. 1: The structure of the database assembled within the Glaciers_cci project.
Fig. 1 shows the structure and content of the database for the glacier area product with the EO datasets assembled for the RR exercise. Table 1 lists the test sites selected for validation and the RR exercises.
Fig. 2: Structure and content of the database for the glacier area product.
Coverage (Latitude, Longitude in decimal degrees)
ID Glacier Region Upper left Corner
(Lat Lon, Dec Deg) Upper Right Corner (Lat Lon, Dec Deg)
Lower left Corner (Lat Lon, Dec Deg)
Lower Right Corner (Lat Lon, Dec Deg)
GA1 Chugach Mts.
61.15N, 144.6W 60.65N, 144.05W
GA2 Oetztal Alps 46.9N, 10.65E 46.7N, 10.9E
GA3 Silvretta Gotthard
46.85N, 10.15E 46.52N, 8.46E
only centre coordinates
GA4 Kashmir 34.33N, 75.45E 34.0N, 75.95E
GA5 Khumbu Himalaya
28.2N, 86.8E 27.8E, 87.0E
Table 1: Corner coordinates of the test sites selected for glacier area.
Table 2 shows the EO datasets available for RR participants for the glacier area product. Table 3 shows the validation datasets available for the different test sites selected for glacier area.
Fig. 3 shows the structure and content of the database for the glacier elevation change product with the EO datasets assembled for the RR exercise.
Fig. 3: Structure and content of the database for the glacier elevation change product. The following Table 4 and Table 5 together with the time line plots (Fig. 4) give an overview of the datasets available for validation and RR for the participants of the glacier elevation change product. As the datasets are freely available, they will not be stored in the DBT2. However, links to the dataset providers will be available. Test sites EC1 and EC2 are selected for the validation/RR of altimetry, sites EC3 and EC4 for DEM differencing.
Fig. 4: Temporal coverage of EO and validation data sets for the elevation change product – altimetry. Table 4 lists the test sites selected for validation efforts and RR exercises for the glacier elevation change product. Table 5 lists the EO datasets available for RR participants for the glacier elevation change product. Table 6 shows the validation datasets available for different test sites for the glacier elevation change product. The airborne altimetry datasets of the CRYOVEX campaign can be requested at the web-addresses listed in Table 7 (Devon ice cap) and Table 8 (Austfonna). User authorisation is required to access the datasets.
Table 5: Available EO data for the glacier elevation change test sites. The satellite altimetry datasets required for the RR exercise are freely available at the following web-addresses:
NASA ICESat/GLAS data: http://nsidc.org/data/icesat/index.html ESA Envisat RA-2 data*: http://eopi.esa.int/esa/esa?cmd=aodetail&aoname=Registration
* This is the link where the user hast to register to get free acces to ERS-1/ERS-2 RA and ENVISAT RA-2.
Fig. 5 shows the structure and content of the database for the glacier velocity product with the EO datasets assembled for the RR exercise. Table 9 lists the test sites selected for validation efforts and RR exercises for the glacier velocity product. Table 10 lists the EO datasets available for RR participants for the glacier velocity product. Table 11 shows the validation datasets available for different test sites for the glacier velocity product.