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The O2A GeoTIFF is a specification of the metadata tags nomenclature inside a GeoTIFF used in the O2A dataflow. It extends the public GeoTIFF format with defined metadata tags which are used in the O2A dataflow.

Version 1.1

The O2A GeoTIFF specification version 1.1 is in progress and not yet fully proofed. It will replace the the O2A GeoTIFF specification version 1.

GeoTIFF with WKT representation of the coordinate reference system (it needs to be a CRS existing in the EPSG library) and additional metadata tags holding dataset-specific information.

A O2A GeoTIFF needs to contain all the following metadata tags. If any values are unkown, they should be left empty.

MetadataDescription, ExamplesValue

Coordinate System

The Coordinate System (SRS,CRS) must be written in the WKT format and must be valid against the EPSG code representation. If not, it won't be accepted.

e.g. WKT of EPSG:4326: https://epsg.io/4326.wkt

mandatory
PARAMETER_NAME

(Natural language) name of measured or calculated parameter.

e.g.: sic, multibeam

can be empty
PARAMETER_URN

The parameter urn of the dataset as defined in sensor.awi.de or build from a pangaea DOI. It will be used for decisions in the o2a dataflow.

e.g.: satellite:gcomw1:amsr2:l2:sic
        pangaea:893351:M132_bathy_data-products:M132_soundings_WGS84:multibeam


PARAMETER_UNIT

The unit of the given parameter

e.g. %

can be empty

DATE_TIME

or

DATE_TIME_START

DATE_TIME_END

Date/Time of the data, in the ISO 8601 format, e.g. YYYY-MM-DDThh:mm:ss.
Either one timestamp (DATE_TIME) or two timestamps for time series (DATE_TIME_START
, DATE_TIME_END).
mandatory
LICENSE

License of the dataset.

e.g. MIT, CC BY-NC 3.0

can be empty

Examples

Metadata like in the following examples could be retrieved by using the gdalinfo command.

e.g.: gdalinfo ./path/to/file.sdi.tif

Data from sensor.awi.de

Driver: GTiff/GeoTIFF
Files: ../platforms/satellite/gcomw1/amsr2/l2/sic/data/2019/05/21/asi-AMSR2-n3125-20190521_EPSG4326.tif
Size is 4268, 4268
Coordinate System is:
  PROJCS["WGS 84 / Arctic Polar Stereographic",
    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"]],
  PROJECTION["Polar_Stereographic"],
  PARAMETER["latitude_of_origin",71],
  PARAMETER["central_meridian",0],
  PARAMETER["scale_factor",1],
  PARAMETER["false_easting",0],
  PARAMETER["false_northing",0],
  UNIT["metre",1,
    AUTHORITY["EPSG","9001"]],
  AXIS["X",EAST],
  AXIS["Y",NORTH],
  AUTHORITY["EPSG","3995"]]
Origin = (-6527893.000000000000000,6882500.000000000000000)
Pixel Size = (3125.000000000000000,-3125.000000000000000)
Metadata:
  AREA_OR_POINT=Area
  grid_information=longitude-latitude grid for these data to be found at: https://seaice.uni-bremen.de/data/grid_coordinates/n3125/
  long_name=ASI Ice Concentration, Version: 5.4, 20190521, res: 3.12500, AMSR2, Region: Arctic3125
  valid_range=0, 100
  PARAMETER_NAME=sic
  PARAMETER_URN=satellite:gcomw1:amsr2:l2:sic  
  PARAMETER_UNIT=%
  LICENSE=
  DATE_TIME=2019-05-21T00:00:00
  
Image Structure Metadata:
  INTERLEAVE=BAND
Corner Coordinates:
Upper Left (-6527893.000, 6882500.000) (136d30'52.93"W, 15d 7'10.61"N)
Lower Left (-6527893.000,-6455000.000) ( 45d19'18.07"W, 16d55'59.58"N)
Upper Right ( 6809607.000, 6882500.000) (135d18'18.09"E, 13d58'41.21"N)
Lower Right ( 6809607.000,-6455000.000) ( 46d31'52.83"E, 15d43'36.08"N)
Center ( 140857.000, 213750.000) (146d36'57.28"E, 87d38'39.46"N)
Band 1 Block=512x512 Type=Float32, ColorInterp=Gray
  Min=0.000 Max=100.000
  Minimum=0.000, Maximum=100.000, Mean=89.065, StdDev=23.340
  NoData Value=0
  Overviews: 2134x2134, 1067x1067, 534x534, 267x267, 134x134, 67x67
Metadata:
    STATISTICS_MAXIMUM=100
    STATISTICS_MEAN=89.065134675115
    STATISTICS_MINIMUM=0.0002532234066166
    STATISTICS_STDDEV=23.340079762818

Data from www.pangaea.de

Driver: GTiff/GeoTIFF
Files: ../pangaea/893351/M132_bathy_data-products/M132_soundings_WGS84/M132_soundings_EPSG4326_2016-11-15.tif
Size is 4268, 4268
Coordinate System is:
  PROJCS["WGS 84 / Arctic Polar Stereographic",
    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"]],
  PROJECTION["Polar_Stereographic"],
  PARAMETER["latitude_of_origin",71],
  PARAMETER["central_meridian",0],
  PARAMETER["scale_factor",1],
  PARAMETER["false_easting",0],
  PARAMETER["false_northing",0],
  UNIT["metre",1,
    AUTHORITY["EPSG","9001"]],
  AXIS["X",EAST],
  AXIS["Y",NORTH],
  AUTHORITY["EPSG","3995"]]
Origin = (-6527893.000000000000000,6882500.000000000000000)
Pixel Size = (3125.000000000000000,-3125.000000000000000)
Metadata:
  AREA_OR_POINT=Area
    PARAMETER_NAME=multibeam
    PARAMETER_URN=pangaea:893351:M132_bathy_data-products:M132_soundings_WGS84:multibeam
    PARAMETER_UNIT=
    LICENSE=Creative Commons Attribution-NonCommercial 3.0 Unported (CC-BY-NC-3.0)
    DATE_TIME_START=
2016-11-15T00:00:00
    DATE_TIME_END=2016-12-11T00:00:00
Image Structure Metadata:
  INTERLEAVE=BAND
Corner Coordinates:
Upper Left (-6527893.000, 6882500.000) (136d30'52.93"W, 15d 7'10.61"N)
Lower Left (-6527893.000,-6455000.000) ( 45d19'18.07"W, 16d55'59.58"N)
Upper Right ( 6809607.000, 6882500.000) (135d18'18.09"E, 13d58'41.21"N)
Lower Right ( 6809607.000,-6455000.000) ( 46d31'52.83"E, 15d43'36.08"N)
Center ( 140857.000, 213750.000) (146d36'57.28"E, 87d38'39.46"N)
Band 1 Block=512x512 Type=Float32, ColorInterp=Gray
  Min=0.000 Max=100.000
  Minimum=0.000, Maximum=100.000, Mean=89.065, StdDev=23.340
  NoData Value=0
  Overviews: 2134x2134, 1067x1067, 534x534, 267x267, 134x134, 67x67
Metadata:
    STATISTICS_MAXIMUM=100
    STATISTICS_MEAN=89.065134675115
    STATISTICS_MINIMUM=0.0002532234066166
    STATISTICS_STDDEV=23.340079762818



Version 1 (deprecated)

Definition for Format version 1 is in progress and is not yet proofed.

An GeoTiff with defined metadata tags. The advantage is to store the SensorURN and/or DOI and/or additional metadata tags in the file.

GeoTiff with well formed WKT description of the coordinate system and additional defined metadata tags holding dataset-specific information. Attribute names (orange) are case sensitive.

Coordinate System

The Coordinate System (SRS, CRS) must be written in the WKT format and must be valid against it. If not, it won't be accepted.

e.g. WKT of EPSG:4326: https://epsg.io/4326.wkt



PARAMETER_URN

The sensor or parameter urn of the dataset as defined in sensor.awi.de. It will be used for decisions in the o2a dataflow.

e.g. 'satellite:gcomw1:amsr2:l2:sic'

PARAMETER_UNIT

The unit of the given parameter.

e.g. '%'

Example: sensor.awi.de

Driver: GTiff/GeoTIFF
Files: ../Downloads/SeaIceRgb.tiff
Size is 1170, 385
Coordinate System is:
GEOGCS["WGS 84",
  DATUM["WGS_1984",
    SPHEROID["WGS 84",6378137,298.257223563,
    AUTHORITY["EPSG","7030"]],
    AUTHORITY["EPSG","6326"]],
  PRIMEM["Greenwich",0],
  UNIT["degree",0.0174532925199433],
  AUTHORITY["EPSG","4326"]]
Origin = (55.375000000188301,87.291666666664497)
Pixel Size = (0.041666666666700,-0.041666666666700)
Metadata:
    AREA_OR_POINT=Area
    PARAMETER_URN=satellite:gcomw1:amsr2:l2:sic 
    PARAMETER_UNIT=%
    DOI=PANGAEA.123456
Image Structure Metadata:
    INTERLEAVE=PIXEL
Corner Coordinates:
  Upper Left ( 55.3750000, 87.2916667) ( 55d22'30.00"E, 87d17'30.00"N)
  Lower Left ( 55.3750000, 71.2500000) ( 55d22'30.00"E, 71d15' 0.00"N)
  Upper Right ( 104.1250000, 87.2916667) (104d 7'30.00"E, 87d17'30.00"N)
  Lower Right ( 104.1250000, 71.2500000) (104d 7'30.00"E, 71d15' 0.00"N)
Center ( 79.7500000, 79.2708333) ( 79d45' 0.00"E, 79d16'15.00"N)
Band 1 Block=1170x2 Type=Byte, ColorInterp=Red
Band 2 Block=1170x2 Type=Byte, ColorInterp=Green
Band 3 Block=1170x2 Type=Byte, ColorInterp=Blue





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