QUALITY CONTROL OF POSITIONAL ACCURACY OF 1:10000 ORTHOPHOTO PRODUCTS IN THE THIRD NATIONAL LAND SURVEY
Keywords: The third national land survey, Orthophoto products, Quality control, Plane Position Accuracy, Image Edge Accuracy, Quality Assessment
Abstract. The third national land survey is based on the orthophotos products. Only by providing 1:10000 orthophoto products that meet the quality requirements can the third national land survey be carried out smoothly, and the third national land survey products can be guaranteed to be accurate and reliable. Positional accuracy as an important quality element of 1:10000 orthophoto products is a key factor affecting the quality of 1:10000 orthophoto products, and directly affects the quality of the third national land survey products.
This paper introduces the content of the positional accuracy quality inspection in the 1:10000 orthophoto products of the third national land survey.The mean square error in plane position and the image edge match are two important test entries in the quality control of positional accuracy . The paper specifically elaborates on the quality control of the above two important test entries. The quality control indexes of mean square error in plane position and the image edge match are introduced in detail, and the quality inspection method and quality evaluation method of position accuracy are proposed. And, the main quality problems found in the positional accuracy checking are illustrated by way of case analysis. At the same time, the cause analysis was carried out for these specific quality problems, and corresponding improvement suggestions were also proposed.This paper provides technical support and reference for the quality inspection of 1:10000 orthophoto products, and also has some positive effects on quality improvement.