Abstract

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ERROR ESTIMATION IN DEVELOPING GIS MAPS USING DIFFERENT INPUT METHODS OF LAND SURVEYING

Asst. Prof. Dr. Asma Th. Ibraheem, Qasim M. Daham, and Ali Jasim Hasan


Surveying for Civil engineering is a particular type of surveying known as land surveying, it is the detailed study or inspection, as by gathering information through observations, measurements in the field, questionnaires, or research of legal instruments, and data analysis in the support of planning, designing, and establishing of property boundaries. Land surveying can include associated services such as mapping and related data accumulation, construction layout surveys, precision measurements of length, angle, elevation, area, and volume, as well as horizontal and vertical control surveys, and the analysis and utilization of land survey data. Surveyors use various tools to do their work successfully and accurately, such as total stations, robotic total stations, GPS receivers, prisms, 3D scanners, radio communicators, handheld tablets, digital levels, and surveying software. Survey data can be directly entered into a GIS from digital data collection systems on survey instruments. When data is captured, the user should consider if the data should be captured with either a relative accuracy or absolute accuracy, since this could not only influence how information will be interpreted but also the cost of data captured. In this paper GIS maps were developed depending on the field surveying data made for a two traverses. First one has ribs less than 50m length and the other larger than 50m. Each traverse is holding five times using five equipments and instruments: Tape, Level, Digital level, Digital theodolite and Laser tape. Also those maps were drawn by using both of ACAD and ArcView softwares. Then a detail surveying map was produced. The precision was computed for both traverses in each method. Its value is range from 1/140 to 1/10000