LARS Tech Report Number
ERTS-A was successfully launched to become ERTS-l on July 23, 1972. The sensors on board were utilized to collect image data over the U.S. for the first time two days l a t e r on Tuesday, July 25. An early analysis of a data set was conducted at Purdue/LARS in order to arrive at preliminary indications as quickly as possible about the operating characteristics and potential value of this satellite as a data gathering device.
To this end a black and white image of channel 5 data together with tapes from the multispectral scanner was made available to Purdue on July 26, arriving by courier at about 11:00 P.M. Based upon a preliminary inspection of this data in image form, plans were made for four sub-projects. These involved the analysis by multispectral pattern recognition techniques of the full frame and two particular subframes and a study of the data quality as discussed below.
The frame made available for analysis (Frame 1002-16312) was taken from the first pass of the satellite across the U.S. and was of the Red River Valley area of Texas and Oklahoma. The frame is centered on a point fifteen miles southeast of Durant, Oklahoma and approximately five miles north of the Red River.
A first look at this data in image form suggested that the area might be rather barren; however, the analysis later showed this to be entirely incorrect. This frame contained important and interesting examples of geology, agriculture, range land, and water resources features.
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