This is a listing of the known occurrences of data quality issues with ASF standard data. It is not meant to be a comprehensive list of all data problems. Instead it is intended to be a reference to identify known errors.
If you receive data that repeatedly exhibits anomalies that are not listed here please contact the
team. When possible please include an image file of the anomalous image (.jpg, gif, .tif, etc…).
Click on the anomaly title below to see a example of the error:
Ghosting – duplicate features appear in the image, usually less intense and slightly offset in azimuth from the original feature. (J1_34175_STD_299)
Range Lines – lines of no data, or saturated data run across azimuth, at a fixed range.
(E2_15528_STD_289)
Azimuth Lines - lines of no data, or saturated data run across range, at a fixed azimuth.
(R1_08132_ST6_367)
Tabs – rectangular blocks of data exist outside normal image area. This anomaly may be rectified by reprocessing. Images of this anomaly are unavailable.
Super Tanker – a single rectangular block of saturated data, with occasional comet tails of saturation.(R1_10679_SWB_011)
Saturation Power Loss – drastic radiometric variance for similar targets, easily discernible at Scansar beam seams. This is more likely to occur in images of coastal areas. (R1_12310_SWB_195)
Beam Seam – present in Scansar products. Radiometric variance between beams is evident causing obvious lines running the length of an image at a fixed range. (R1_13683_SWB_011)
Venetian Blind- small bands of radiometric variance along the azimuth axis, in extreme cases causes the image to appear blurry. (R1_08706_SWB_281)
Zipper Banding– present in Scansar products. Small bands of radiometric variance located within a single beam. These anomalies are of varying lengths within the beam. They are usually much more subtle radiometric variance than with the Venetian Blind effect. (R1_13464_SWB_326)
