Besides the realization of the formal programme of the Left, consisting of the repeal of the grist tax, the abolition of the forced currency, the extension of the suffrage and the development of the railway system Depretis laid the foundation for land tax re-assessment by introducing a new cadastral survey.
Accurate statistics with regard to the area occupied in different forms of cultivation are difficult to obtain, both on account of their varied and piecemeal character and from the lack of a complete cadastral survey.
Ptolemy, who had access to the treasures of the famous library of Alexandria was able, no doubt, to utilize these cadastral plans when compiling his geography.
At the same time the cadastral plans, reduced to a scale of 1:25,000, are being published in photo-lithography.
The maps are based upon the cadastral plans (1: 1000), thoroughly revised and connected with the triangulation of France and furnished with contours at intervals of 5 m.
A Survey Department, inaugurated about 1887, has completed the general survey of the whole country, and has made a cadastral survey of a large part of the thickly inhabited and highly cultivated districts of central Siam.
The impost upon land is based upon the cadastral survey independently of the vicissitudes of harvests.
On account of the inequalities still existing in the cadastral survey, in spite of the law of 1886 (see Agriculture, above), great differences are found in the land tax assessments in various parts of Italy.
The Specialkarte of Austria-Hungary on a scale of r:75,000 (765 sheets), based upon a triangulation and cadastral surveys (1816-1867), was completed in 1889, and published in heliogravure.
The cadastral surveys in Canada are carried on by a commission of Crown-lands in the old provinces and by a Dominion land office, which lays out townships as in the United States, but with greater accuracy.