Nimbus Images Reveal 1960s Sea Ice Edges

Using satellite data from the Nimbus Data Rescue Project, NSIDC scientists have estimated the location of the North and South Pole sea ice edges at various times during the late 1960s. The researchers manually inspected thousands of recently recovered AVCS and IDCS images from 1964, 1966, and 1969-70 and placed points along visible ice edges to help delineate North and South Pole sea ice extent.

Users can download these data in Comma Separated Values (CSV) format by visiting  Nimbus Ice Edge Points from Nimbus Visible Imagery L2, CSV .

Ice edge points from 9 September, 1969 overlaid on IDCS source image. Colors indicate confidence and whether the point is an edge, lead, or region of broken ice.

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