map accuracy in a sentence

1. The mapping accuracy of satellite imagery block adjustment
2. Mapping accuracy to less than 2 pixels in xy - plane and 4 pixels in height can be achieved for plain operators
3. Because the elevation data we have acquired through gps is too variable to satisfy the mapping accuracy requirement the elevation value is solved by the water lever observation in the hydrology station and datum horizon correction of sounding observation
4. It's difficult to find map accuracy in a sentence.