Experience has revealed a problem in the analysis and interpretation of ERTS multispectral scanner (MSS) data. The problem areas specified on aerial photographs or topographic maps for training recognition computers and/or evaluating recognition results. It is difficult for an analyst to accurately identify which ERTS pixels (picture elements) on a digital image display belong to specific areas and test plots, especially when they are small. A computer-aided procedure to correlate coordinates from topographic maps and/or aerial photographs with ERTS data coordinates has been developed. In the procedure, a map transformation from Earth coordinates to ERTS scan line and point numbers is calculated using selected ground control points and the method of Earth coordinates of selected areas to obtain the corresponding ERTS point and line numbers. An optional provision allows moving the boundaries of the plots inwards by variable distances (typically ≥ half a resolution element) so the selected pixels will not overlap adjacent features.

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