THE WORK OF THE ORDNANCE SURVEY OF THE IRISH FREE STATE

Abstract

Up to 31st March 1922, the work in Ireland with regard to the revision and supply of Ordnance Survey Maps was governed by similar rules to those existing at the Ordnance Survey of Great Britain. No changes were made in the Irish Free State until the revision of Co. Waterford was completed on the 25-inch scale in 1923. It was then decided to depart from the usual procedure of taking up the work of the revision of Counties according to a cycle of years, and to revise those particular portions of the country in which extensive alterations had been carried out by reason of the division of properties by the Congested Districts Board and the Irish Land Commission. Accordingly, those portions of Counties Galway, Mayo and Roscommon which had undergone the greatest development were taken up for revision. In all eighty-nine sheets were specially revised and completed by 1928.     

THE ORDNANCE SURVEY AND THE FINAL REPORT OF THE DEPARTMENTAL COMMITTEE OF 1935

Abstract

The conclusions of this Committee have aroused small interest so far, because war was upon us almost as soon as the publication (1938). They may, however, greatly affect our surveys and maps of the future, and it is time to examine them. First of all, however, it is desirable to see the background against which the Committee's recommendations appear. For that reason the following chronological summary is given. It is divided into three periods, those of Growth, of Hesitation and of War, and it is given to supplement the chronology of the Final Report in matters which are discussed therein.     

THE USE OF AIR PlIOTOGRApHS BY THE ORDNANCE SURVEY

Abstract

During the last year, the Air Survey Section, Field Division, Ordnance Survey, have had many visitors. Most of them have been surprised at what they have seen: some at the fact that we are able to make so much use of air photographs even in the largest scale surveys, and some at the small amount of information we seem able to extract from them. This paper is an attempt to give in some detail the ways in which air photographs are used to solve the problems of the Ordnance Survey, why they are used and their limitations for our purposes.     

地球空间信息技术在新一轮国土资源大调查中的应用探讨

从分析全球变化和社会可持续发展研究的要求出发,提出地球空间信息技术的形成背景和应用基础。针对新一轮国土资源大调查的性质和任务,探讨了地球空间信息技术在新一轮国土资源大调查中的应用。     

虚拟权平差在矿山大型贯通近井网设计中的应用

本文将虚拟权平差法引入矿山大型贯通近井网的设计中，解决了相距甚远的两井口近井网精度基准不统一的问题，通过对一矿山大到贯通近井网的重新设计证明：该法具有良好的应用前景．