[gdal-dev] Question to Gdalinfo result

[Kai Behncke]

Dear users, I have an aerial image and did a "gdalinfo" to it:


The result is (extract):
--------------------------------------------
Coordinate System is:
GEOGCS["WGS 84",
    DATUM["WGS_1984",
        SPHEROID["WGS 84",6378137,298.2572235630016,
            AUTHORITY["EPSG","7030"]],
        AUTHORITY["EPSG","6326"]],
    PRIMEM["Greenwich",0],
    UNIT["degree",0.0174532925199433],
    AUTHORITY["EPSG","4326"]]
Origin = (8.028439291266251,52.303510658986561)
Pixel Size = (0.000004896399317,-0.000004896399317)
Metadata:
  AREA_OR_POINT=Area
Image Structure Metadata:
  INTERLEAVE=PIXEL
Corner Coordinates:
Upper Left  (   8.0284393,  52.3035107) (  8d 1'42.38"E, 52d18'12.64"N)
Lower Left  (   8.0284393,  52.2664645) (  8d 1'42.38"E, 52d15'59.27"N)
Upper Right (   8.0498072,  52.3035107) (  8d 2'59.31"E, 52d18'12.64"N)
Lower Right (   8.0498072,  52.2664645) (  8d 2'59.31"E, 52d15'59.27"N)
Center      (   8.0391232,  52.2849876) (  8d 2'20.84"E, 52d17'5.96"N)
-----------------------------

All right, the most seems very clear to me, but does anybody know what:

            AUTHORITY["EPSG","7030"]],
        AUTHORITY["EPSG","6326"]],

    UNIT["degree",0.0174532925199433],
    AUTHORITY["EPSG","4326"]]

mean??
Thank you very much in advance, Kai


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