Sentinel-1 EW mode dataset for Antarctica from 2014–2020 produced by the CASEarth Cloud Service Platform

Figures & data

Table 1. Attributes for EW mode on Sentinel-1.

Parameters	Values
Acquisition mode	EW
Swath width (km)	410
Resolution (m)	20 × 40
Incidence angle range	18.9° – 47.0°
Polarization options	Dual HH+HV, VV+VH Single HH, VV
Sub-swaths	5
Azimuth steering angle	± 0.8°
Maximum Noise Equivalent Sigma Zero (NESZ)	−22 dB

Figure 1. Monthly Sentinel-1 EW image acquisition totals for the Antarctic ice sheet.

Figure 2. Coverage of Sentinel-1 data in Antarctica, revised based on Google earth.

Table 2. Configuration of virtual machines.

Software & Tools	Version	Function
Operating System	CentOS 7.0, Linux version 3.10.0–957.1.3.el7.x86_64([e-mail]) (gcc version 4.8.5 20,150,623 (Red Hat 4.8.5–36) (GCC)	Basic activities used to support virtual machines
PythonEnvironment	Python 2.7.5/Python 3.9.0	Used to call the development scheduler, automatically schedule, monitor, and record the batch data processing, and generate a metadata file to facilitate data processing and scheduling later
SNAP	SNAP 8.0	Used to preprocess Sentinel-1 data
GDAL Library	GDAL 3.1.0	Used to convert image format and form pyramid structure

Figure 3. Main data processing flow chart for each virtual machine.

Figure 4. Reprocessing flow chart for Sentinel-1 EW GRD SAR data.

Figure 5. Flow chart of image compression and pyramid generation.

Table 3. Processing results.

Total number of EW images from October 2014 to December 2020: 69,586
Average amount of original data: 194.6 MB	Total amount of data: 12.95 TB
Average amount of data using SNAP processing: 2,103.6 MB	Total amount of data: 139.95 TB
Average amount of processed data: 1,025.9 MB	Total amount of data: 68.25 TB
Average image processing time using SNAP tools: 1.51 min	Total image processing time using SNAP tools: 1,755.63 h
Average processing time for pyramid construction: 0.47 min	Total processing time for pyramid construction: 546.45 h

Table 4. Parameter list of the processed SAR imagery.

Name	Name
Granule Name	Far End Lon
Platform	Faraday Rotation
Sensor	Ascending or Descending
Beam Mode	URL
Beam Mode Description	Size (MB)
Orbit	Off Nadir Angle
Path Number	Stack Size
Frame Number	Baseline Perp.
Acquisition Date	Doppler
Processing Date	GroupID
Processing Level	Data
Start Time	Data CreateTime
End Time	DataSize (.zip) MB
Center Lat	PreProcess_Result (SNAP8.0)
Center Lon	PreProcess_Result CreateTime
Near Start Lat	PreProcess_Result Size MB
Near Start Lon	Build Pyramid & LZW_Result
Far Start Lat	Build Pyramid & LZW_Result Create Time
Far Start Lon	Build Pyramid & LZW_Result Size MB
Near End Lat
Near End Lon
Far End Lat

Figure 6. Validation of the data products.

Figure 7. Histogram comparison for the data products.

Data Availability Statement

The data that support the findings of this study are openly available in ScienceDB at http://www.doi.org/10.11922/sciencedb.j00076.00085.