242 the title of "general instructions regulating the cadastral service" (algemene instructie regelende de dienst van het kadaster), referred to as l.K, 1957. This supersedes the I.K. of 1918. The old regulations no longer were satisfactory, not only because of multiple modifications but also as various subjects were either not dealt with, regulated incompletely or contained in separate orders. The new I.K. aims at systematic codification of existing arrangements as well as at giving rules for subjects not so far dealt with. Use of a loose-leaf system of publication makes it possible to keep the volume up to date in case of future modification. 5. Technical aspects a) Manual for technical operations of the Cadastre. An order of the secretary of state for Finance of 28 May 1956 (no. 41) introduced a new manual for technical operations of the cadastre, drafted by a committee whose members were Prof. ir. W, Baarda, D. de Groot and Ir. F. Harkink. This manual makes a special point of expressing the relative character of requirements of accuracy, which are dependent among other factors on the value and destination of land in the area surveyed. On a sound theoretical basis a system of assessment has been developed for the surveying and com puting method to be used which will guarantee satisfactory execution of cadastral surveys when properly applied. Details may be found in the report presented to Committee III. b. Photogrammetry. As has been mentioned above, a photogrammctric office of the cadastre was established on 1 July 1956. Activities of this office primarily are in the field of mapping for revision of existing surveys. Results obtained so far promise well for the future. In its first year of existence, the office mapped about 10,000 ha (24,700 acres), partly at a scale of 1: 1000 and partly at 12000. c. Reproduction. All reproductions of cadastral maps for internal as well as for outside use are made by the central reproduction service of the cadastre in Amsterdam. In 1954 it was decided to make mechanical reproductions on sheet film of all cadastral plans, called film-plans in the service. These film-plans are filed in the reproduction service in Amsterdam and kept up to date by this service, so that it is now possible to supply inexpen sive reproductions of cadastral maps in the form of diazo prints (whiteprints) made on demand, after the most recent cadastral data. The film-plan file will be built up gradually. At present about 7000 out of a total of some 25000 cadastral plans exist in film-plan form. In consequence of this activity, diazo printing equipment has been com pleted by a Revolute Comet high-speed printer, and a Klimsch Super Auto- Horica (KT) reproduction camera was acquired which makes it possible to produce film-plans eliminating variation due to dimensional instability in the material of the original cadastral maps. The possibility is now being considered of making prints from the film- plans thus produced on paper with an aluminium foil sandwich. These prints could then replace the original cadastral survey plans. Since the beginning of 1955 all new cadastral plans produced in the course of overall revision or of reallotment surveys are made on similar material with an aluminium sandwich. Finally mention should be made of a method in use for some time now for the production of cadastral plans from pencilled sheets produced by photo- grammetric survey. Photographic copies of these sheets, which do not con form to the sheet assembly desired in the finished map, are printed in a contact frame and parts of these prints are then mounted into the desired assembly on a glass plate displaying a map grid.

Digitale Tijdschriftenarchief Stichting De Hollandse Cirkel en Geo Informatie Nederland

Tijdschrift voor Kadaster en Landmeetkunde (KenL) | 1958 | | pagina 44