Japan 4 
surveyed by means of plane table. Even in this field, however, the plane 
table method will gradually be replaced by aerial photogrammetry. 
Terrestrial photogrammetry is open to large scale mapping of dam sites, 
wherewith the best possible result is expected. It may be worthy to note 
that trial surveying of 1:500 maps by aerial photogrammetry is now carried 
on. 
b. Application to Forestry Surveying. 
Aerial photogrammetry is applied on a grand scale to forestry surveying. 
First, it was applied to the surveying of private forests, the area amounting 
to more than 100,000 km? in 5 years. The forestry maps thus obtained show 
features of mountain ridges and valley lines, pass points for compass survey 
ing and so forth. Forestry Board tried to make maps by means of stereoplott- 
ing instruments and to classify wood species. The results were satisfactory 
and they are intending to apply photogrammetric survey to forestry mana- 
gement on broader scale. 
e. Cadastral surveying 
In our country, less accurate provissional cadastral surveying was per- 
formed about 70 years ago. 
The National Land Survey Law was issued in 1951, and scientific cadast- 
ral surveying has been put forward in reference to the Law. 
The survey was first executed by means of plane table. The years' experi 
ences however awake the demand for application of aerial photogrammetry 
in this field of work. According to the Law, the cadastral map is to be plotted 
by Ist or 2nd order instrument with the aero-photos taken on the scale 
1:6,000-1:8,000. The maps, especially those of cultivated area, should be made 
on the scale 1:1,000 or 1:500. 
5. Application to Non Topographic Fields 
Among a number of examples, those referred to below are notable. K. 
Hidaka and his collaborators studied the forms of ocean waver by means 
of stereo-photogrammetry. The investigation has been extended in this line 
by the members of the Hydrographic Institute. 
In addition, Technical Research Laboratory of National Rail Road of 
Japan has advanced the study on the height of shore waves by using 
specially designed instrument, the results of which will be helpful to the 
harbour construction. 
6. Aerial Photo-interpretation 
On the occasion of compiling 1:50,000 Land Use Maps, the method of 
aerial photo interpretation was applied with successful results. The com- 
pilation of the Land Use Map was commenced in 1952, and 212 sheets have 
been completed by the Geographical Survey Instiute. 
Another trial was also made on application to the survey of distu rbed