Abstract
Since 1963, block adjustment has been employed regularly at Asia Air Survey Company. The main reason is that block adjustments can be effectively applied to aerial triangulation; i.e., many blocks may be adjusted covering a comparatively large area-an actual example being the compilation of base maps for forestry.
At the present time, these adjustments together with bi-altitude triangulation are frequently used in our company. Details of block adjustments, with numerical examples, are introduced in this paper.
