# SAFE -- Sentinel-1 SAFE XML Product

Driver for Sentinel products. Currently supports only Sentinel-1 SAR products. See also the GDAL Sentinel-2 driver

SENTINEL data products are distributed using a SENTINEL-specific variation of the Standard Archive Format for Europe (SAFE) format specification. The SAFE format has been designed to act as a common format for archiving and conveying data within ESA Earth Observation archiving facilities.

The SAFE driver will be used if the manifest.safe or the containing directory is selected, and it can treat all the imagery as one consistent dataset.

The SAFE driver also reads geolocation grid points from the metadata and represents them as GCPs on the dataset.

ESA will be distributing other satellite datasets in this format; however, at this time this driver only supports specific Sentinel-1 SAR products. All other will be ignored, or result in various runtime errors.

## Multiple measurements

If the product contains multiple measurements (for example multiple polarizations), each one is available as a raster band - if the swath is the same. When the swath is the same, the geographic area is the same.

If the product contains multiple swaths and multiple polatizations, the driver shows the first swath by default. To access other swaths, the user must select a specific subdataset.

## Examples

- Opening the Sentinel-1 product:

      $ gdalinfo S1A_IW_GRDH_1SDV_20150705T064241_20150705T064306_006672_008EA0_24EE.SAFE/manifest.safe

      Driver: SAFE/Sentinel-1 SAR SAFE Product
      Files: S1A_IW_GRDH_1SDV_20150705T064241_20150705T064306_006672_008EA0_24EE.SAFE/manifest.safe
             S1A_IW_GRDH_1SDV_20150705T064241_20150705T064306_006672_008EA0_24EE.SAFE/measurement/s1a-iw-grd-vh-20150705t064241-20150705t064306-006672-008ea0-002.tiff
             S1A_IW_GRDH_1SDV_20150705T064241_20150705T064306_006672_008EA0_24EE.SAFE/measurement/s1a-iw-grd-vv-20150705t064241-20150705t064306-006672-008ea0-001.tiff
      Size is 256, 167
      Coordinate System is `'
      GCP Projection =
      GEOGCS["WGS 84",
          DATUM["WGS_1984",
              SPHEROID["WGS 84",6378137,298.257223563,
                  AUTHORITY["EPSG","7030"]],
              AUTHORITY["EPSG","6326"]],
          PRIMEM["Greenwich",0,
              AUTHORITY["EPSG","8901"]],
          UNIT["degree",0.0174532925199433,
              AUTHORITY["EPSG","9122"]],
          AUTHORITY["EPSG","4326"]]
      GCP[  0]: Id=1, Info=
                (0,0) -> (-8.03500070209827,39.6332161725022,141.853266630322)
      Metadata:
        ACQUISITION_START_TIME=2015-07-05T06:42:41.504840
        ACQUISITION_STOP_TIME=2015-07-05T06:43:06.503530
        BEAM_MODE=IW
        BEAM_SWATH=IW
        FACILITY_IDENTIFIER=UPA_
        LINE_SPACING=1.000655e+01
        MISSION_ID=S1A
        MODE=IW
        ORBIT_DIRECTION=DESCENDING
        ORBIT_NUMBER=6672
        PIXEL_SPACING=1.000000e+01
        PRODUCT_TYPE=GRD
        SATELLITE_IDENTIFIER=SENTINEL-1
        SENSOR_IDENTIFIER=SAR
        SWATH=IW
      Subdatasets:
        SUBDATASET_1_NAME=SENTINEL1_DS:S1A_IW_GRDH_1SDV_20150705T064241_20150705T064306_006672_008EA0_24EE.SAFE:IW_VH
        SUBDATASET_1_DESC=Single band with IW swath and VH polarization
        SUBDATASET_2_NAME=SENTINEL1_DS:S1A_IW_GRDH_1SDV_20150705T064241_20150705T064306_006672_008EA0_24EE.SAFE:IW_VV
        SUBDATASET_2_DESC=Single band with IW swath and VV polarization
        SUBDATASET_3_NAME=SENTINEL1_DS:S1A_IW_GRDH_1SDV_20150705T064241_20150705T064306_006672_008EA0_24EE.SAFE:IW
        SUBDATASET_3_DESC=IW swath with all polarizations as bands
      Corner Coordinates:
      Upper Left  (    0.0,    0.0)
      Lower Left  (    0.0,  167.0)
      Upper Right (  256.0,    0.0)
      Lower Right (  256.0,  167.0)
      Center      (  128.0,   83.5)
      Band 1 Block=256x16 Type=UInt16, ColorInterp=Undefined
        Metadata:
          POLARISATION=VH
          SWATH=IW
      Band 2 Block=256x16 Type=UInt16, ColorInterp=Undefined
        Metadata:
          POLARISATION=VV
          SWATH=IW

- It's not mandatory to open manifest.safe, just pass the folder name:

      $ gdalinfo S1A_IW_GRDH_1SDV_20150705T064241_20150705T064306_006672_008EA0_24EE.SAFE

- Opening a single measurement (for example IW/VH):

      $ gdalinfo SENTINEL1_DS:S1A_IW_GRDH_1SDV_20150705T064241_20150705T064306_006672_008EA0_24EE.SAFE:IW_VV

      Driver: SAFE/Sentinel-1 SAR SAFE Product
      Files: S1A_IW_GRDH_1SDV_20150705T064241_20150705T064306_006672_008EA0_24EE.SAFE/manifest.safe
             S1A_IW_GRDH_1SDV_20150705T064241_20150705T064306_006672_008EA0_24EE.SAFE/measurement/s1a-iw-grd-vh-20150705t064241-20150705t064306-006672-008ea0-002.tiff
      Size is 256, 167
      Coordinate System is `'
      GCP Projection =
      GEOGCS["WGS 84",
          DATUM["WGS_1984",
              SPHEROID["WGS 84",6378137,298.257223563,
                  AUTHORITY["EPSG","7030"]],
              AUTHORITY["EPSG","6326"]],
          PRIMEM["Greenwich",0,
              AUTHORITY["EPSG","8901"]],
          UNIT["degree",0.0174532925199433,
              AUTHORITY["EPSG","9122"]],
          AUTHORITY["EPSG","4326"]]
      GCP[  0]: Id=1, Info=
                (0,0) -> (-8.03500070209827,39.6332161725022,141.853266630322)
      Metadata:
        ACQUISITION_START_TIME=2015-07-05T06:42:41.504840
        ACQUISITION_STOP_TIME=2015-07-05T06:43:06.503530
        BEAM_MODE=IW
        BEAM_SWATH=IW
        FACILITY_IDENTIFIER=UPA_
        LINE_SPACING=1.000655e+01
        MISSION_ID=S1A
        MODE=IW
        ORBIT_DIRECTION=DESCENDING
        ORBIT_NUMBER=6672
        PIXEL_SPACING=1.000000e+01
        PRODUCT_TYPE=GRD
        SATELLITE_IDENTIFIER=SENTINEL-1
        SENSOR_IDENTIFIER=SAR
        SWATH=IW
      Subdatasets:
        SUBDATASET_1_NAME=SENTINEL1_DS:S1A_IW_GRDH_1SDV_20150705T064241_20150705T064306_006672_008EA0_24EE.SAFE:IW_VH
        SUBDATASET_1_DESC=Single band with IW swath and VH polarization
        SUBDATASET_2_NAME=SENTINEL1_DS:S1A_IW_GRDH_1SDV_20150705T064241_20150705T064306_006672_008EA0_24EE.SAFE:IW_VV
        SUBDATASET_2_DESC=Single band with IW swath and VV polarization
        SUBDATASET_3_NAME=SENTINEL1_DS:S1A_IW_GRDH_1SDV_20150705T064241_20150705T064306_006672_008EA0_24EE.SAFE:IW
        SUBDATASET_3_DESC=IW swath with all polarizations as bands
      Corner Coordinates:
      Upper Left  (    0.0,    0.0)
      Lower Left  (    0.0,  167.0)
      Upper Right (  256.0,    0.0)
      Lower Right (  256.0,  167.0)
      Center      (  128.0,   83.5)
      Band 1 Block=256x16 Type=UInt16, ColorInterp=Undefined
        Metadata:
          POLARISATION=VH
          SWATH=IW

- A SLC product with 5 swaths in single pol (the first EW1/HH is selected by default):

      $ gdalinfo S1A_EW_SLC__1SSH_20150226T010823_20150226T010902_004787_005F2B_E43E.SAFE

      Driver: SAFE/Sentinel-1 SAR SAFE Product
      Files: S1A_EW_SLC__1SSH_20150226T010823_20150226T010902_004787_005F2B_E43E.SAFE/manifest.safe
             S1A_EW_SLC__1SSH_20150226T010823_20150226T010902_004787_005F2B_E43E.SAFE/measurement/s1a-ew1-slc-hh-20150226t010823-20150226t010859-004787-005f2b-001.tiff
      Size is 6871, 14016
      Coordinate System is `'
      GCP Projection =
      GEOGCS["WGS 84",
          DATUM["WGS_1984",
              SPHEROID["WGS 84",6378137,298.257223563,
                  AUTHORITY["EPSG","7030"]],
              AUTHORITY["EPSG","6326"]],
          PRIMEM["Greenwich",0,
              AUTHORITY["EPSG","8901"]],
          UNIT["degree",0.0174532925199433,
              AUTHORITY["EPSG","9122"]],
          AUTHORITY["EPSG","4326"]]
      GCP[  0]: Id=1, Info=
                (0,0) -> (-26.9158879633399,-76.5938687850829,250.211451298701)
      GCP[  1]: Id=2, Info=

      ...supressed output...

      GCP[272]: Id=273, Info=
                (6870,14015) -> (-35.4972634588715,-75.5331533717809,0)
      Metadata:
        ACQUISITION_START_TIME=2015-02-26T01:08:23.095253
        ACQUISITION_STOP_TIME=2015-02-26T01:09:02.335069
        BEAM_MODE=EW
        BEAM_SWATH=EW1
        FACILITY_IDENTIFIER=ESRIN headquarters
        LINE_SPACING=1.992087e+01
        MISSION_ID=S1A
        MODE=EW
        ORBIT_DIRECTION=ASCENDING
        ORBIT_NUMBER=4787
        PIXEL_SPACING=5.990303e+00
        PRODUCT_TYPE=SLC
        SATELLITE_IDENTIFIER=SENTINEL-1
        SENSOR_IDENTIFIER=SAR
        SWATH=EW1
      Subdatasets:
        SUBDATASET_1_NAME=SENTINEL1_DS:S1A_EW_SLC__1SSH_20150226T010823_20150226T010902_004787_005F2B_E43E.SAFE:EW1_HH
        SUBDATASET_1_DESC=Single band with EW1 swath and HH polarization
        SUBDATASET_2_NAME=SENTINEL1_DS:S1A_EW_SLC__1SSH_20150226T010823_20150226T010902_004787_005F2B_E43E.SAFE:EW2_HH
        SUBDATASET_2_DESC=Single band with EW2 swath and HH polarization
        SUBDATASET_3_NAME=SENTINEL1_DS:S1A_EW_SLC__1SSH_20150226T010823_20150226T010902_004787_005F2B_E43E.SAFE:EW3_HH
        SUBDATASET_3_DESC=Single band with EW3 swath and HH polarization
        SUBDATASET_4_NAME=SENTINEL1_DS:S1A_EW_SLC__1SSH_20150226T010823_20150226T010902_004787_005F2B_E43E.SAFE:EW4_HH
        SUBDATASET_4_DESC=Single band with EW4 swath and HH polarization
        SUBDATASET_5_NAME=SENTINEL1_DS:S1A_EW_SLC__1SSH_20150226T010823_20150226T010902_004787_005F2B_E43E.SAFE:EW5_HH
        SUBDATASET_5_DESC=Single band with EW5 swath and HH polarization
      Corner Coordinates:
      Upper Left  (    0.0,    0.0)
      Lower Left  (    0.0,14016.0)
      Upper Right ( 6871.0,    0.0)
      Lower Right ( 6871.0,14016.0)
      Center      ( 3435.5, 7008.0)
      Band 1 Block=7852x1 Type=CInt16, ColorInterp=Undefined
        Metadata:
          POLARISATION=HH
          SWATH=EW1

## Data Calibration

Currently the driver does not apply calibration information.

## See Also:

- SAR Formats (ESA Sentinel Online)
- SAFE Specification (ESA Sentinel Online)
- GDAL Sentinel-2 driver