By Charles, M.c Ichoku
At times it becomes necessary to use non-
conventional instruments or devices for measurements,
especially when the conventional ones are either not
available or very expensive. In this research the
capability of the Zeiss C-8 coordinatograph as a photo
coordinate measuring instrument has been investigated.
Image coordinates of a number of selected test points
were measured on the instrument. They were refined * and used to derive their equivalent ground coordinates.
These photogrammetrically derived coordinates were
compared with the ground survey values of the test
points and discrepancies were generated. Statistical
evaluation of results show that the procedure and
principles presented can be used for providing control
for mapping at medium and small scales, mosaic
construction, and remnnaissance surveys.