Products

Product Overview

EOLIS (Elevation Over Land Ice from Swath) is part of the ESA CryoSat ThEMatic PrOducts (CryoTEMPO) initiative, that aims to support a wide variety of end-users working in the areas of sea ice, polar oceans, land ice, coastal areas and hydrology. The EOLIS products exploit CryoSat’s SARIn mode and the novel Swath processing technique to deliver increased spatial and temporal coverage of time-dependent elevation over land ice, a critical metric for tracking ice mass trends. The CryoTEMPO EOLIS products are the operational result of research and development projects CryoTop and CryoTop-Evolution

Products available are:

  1. SWATH THEMATIC POINT PRODUCT (EOLIS POINTS)
  2. SWATH THEMATIC GRIDDED PRODUCT (EOLIS DEM)

current release - version 1.0

The first version of the release covers Greenland and includes two products: A thematic point cloud product and a DEM. Both products are now available from the month of June 2019 to January 2020, with further data becoming available on a monthly basis.

1) Swath Thematic Point Product (EOLIS POINTS)

Description: The EOLIS point product contains a dense set of elevation measurements for individual observations. Due to the high volume of data, the data has been split into tiles of 100x100km in size.

The point product contains the attributes:

  • Time (time in seconds)
  • X (polar coordinate)
  • Y (polar coordinate)
  • Elevation (metres)
  • Uncertainty (metres)
  • isSwath (1 for Swath, 0 for POCA)
  • fields (id of L1b and L2 underlying products)

Coordinate reference system: EPSG:3413 || +proj=stere +lat_0=90 +lat_ts=70 +lon_0=-45 +k=1 +x_0=0 +y_0=0 +datum=WGS84 +units=m +no_defs

Extent: Latitude range = 60 to 84 degrees N, Longitude Range = 287 to 349 degrees E

The folder structure on the ESA Science Server is: TEMPO_SWATH_POINT/YYYY/MM/<ZONE>

The file naming convention is: CS_OFFL_THEM_POINT_<ZONE>_<YYYY>_<MM>_<X>_<Y>_<VERSION> where ZONE is currently Greenland only. Note that X and Y are polar coordinates.

Data tile locations: A Shapefile (.shp) containing the data tile locations is available in each monthly folder in tar file format: CS_OFFL_THEM_POINT_<ZONE>_<YYYY>_<MM>.tgz

Map of the 100km grid cells over Greenland for 2011 (CRS: EPSG 3413)

2) Swath Thematic Gridded Product (EOLIS DEM)

Description: The EOLIS DEM is a monthly 2km resolution DEM with the data sourced from a rolling 3 month window, e.g. February 2020 will use data from a window starting on the 1st January 2020 and finishing on the 31st March 2020.

The folder structure on the ESA Science Server is:  TEMPO_SWATH_GRID/YYYY/MM/<ZONE> where ZONE is currently Greenland only

Coordinate reference system: EPSG:3413 || +proj=stere +lat_0=90 +lat_ts=70 +lon_0=-45 +k=1 +x_0=0 +y_0=0 +datum=WGS84 +units=m +no_defs

Extent: Latitude range = 60 to 84 degrees N, Longitude Range = 287 to 349 degrees E

Example DEM created over Greenland for January 2020.

Product Handbook

The product handbook is available here:

Validation Report

The validation report is available here:

Feedback and Queries

Feedback or questions about the CryoTEMPO-EOLIS Thematic Products is welcomed. Please use the following contact details:

E-mail: support@cryotempo-eolis.org