Application of GPS RTK in Surveying and Mapping of Large-scale Topographic Map

2021 ◽  
Keyword(s):  
Large Scale ◽  
Topographic Map ◽  
Gps Rtk ◽  
Surveying And Mapping

scholarly journals Quality assessment of DEM derived from topographic maps for geomorphometric purposes

2019 ◽  
Vol 11 (1) ◽  
pp. 843-865 ◽  
Author(s):  
Bartłomiej Szypuła
Keyword(s):  
Laser Scanning ◽  
Large Scale ◽  
Reference Model ◽  
Quality Parameters ◽  
Topographic Maps ◽  
Topographic Map ◽  
Digital Elevation ◽  
Gps Rtk ◽  
Lidar Dem ◽  
Fine Resolution

Abstract Digital elevation models (DEMs) play a significant role in geomorphological research. For geomorphologists reconstructing landform and drainage structure is frequently as important as elevation accuracy. Consequently, large-scale topographic maps (with contours, height points and watercourses) constitute excellent material for creating models (here called Topo-DEM) in fine resolution. The purpose of the conducted analyses was to assess the quality of Topo-DEM against freely-available global DEMs and then to compare it with a reference model derived from laser scanning (LiDAR-DEM). The analysis also involved derivative maps of geomorphometric parameters (local relief, slope, curvature, aspect) generated on the basis of Topo-DEM and LiDAR-DEM. Moreover, comparative classification of landforms was carried out. It was indicated that Topo-DEM is characterised by good elevation accuracy (RMSE <2 m) and reflects the topography of the analyzed area surprisingly well. Additionally, statistical and percentage metrics confirm that it is possible to generate a DEM with very good quality parameters on the basis of a large-scale topographic map (1:10,000): elevation differences between Topo-DEM and: 1) topographic map amounted from−1.68 to +2.06 m,MAEis 0.10 m, RMSE 0.16 m; 2) LiDAR-DEM (MAE 1.13 m, RMSE 1.69 m, SD 1.83 m); 3) GPS RTK measurements amounted from−3.6 to +3.01 m, MAE is 0.72 m, RMSE 0.97 m, SD 0.97 m. For an area of several dozen km2 Topo-DEM with 10×10 m resolution proved more efficient than detailed (1×1 m) LiDAR-DEM.

Key Technology Discussion on Surveying and Mapping 1:1000 Photogrammetric Digital Topographic Map of Laicheng Industrial Zone in Laiwu City

2013 ◽  
Vol 846-847 ◽  
pp. 1166-1170
Author(s):  
De Bao Wang ◽  
Jun Feng Qu ◽  
Xue Ling Fang ◽  
Mei Lan Yu
Keyword(s):  
Large Scale ◽  
Image Database ◽  
Field Work ◽  
Mapping Method ◽  
Topographic Map ◽  
Key Technology ◽  
Aerial Photogrammetry ◽  
Control Survey ◽  
Vertical Accuracy ◽  
Surveying And Mapping

Taking use of VirtuoZos digital photogrametric workstations of Supresoft Inc., employing full digital aerophotogrammetric mapping method, according to existing aerial photographic image database, at the foundation of basic control survey, we carry out aerial photographic control survey, surveying and mapping with pile point method, digital aerotriangulation and full digital stereocompilation. When taking 1:1000 topographic map obtained by indoor edition to field work for compration, supplement and regulation, we mainly aim at the following purposes: determining the nature and quantity as well as filling vacancy for ground and land features obtained by indoor stereocompilation; positioning for habitation, wall and railing, incompletely surveyed, drop shadow-covered and trees-obstructed ground features, as well as newly-added planimetric features after aerial photogrammetry; especially measuring the solid width of a house to centimeter and making eaves correction after measuring the length of a house when needed; correcting the geomatric positioning relationand of ground features according to their solid shape and fairly drawing them in the map; afterwards, we carry out graphic edition again during indoor work. Only in this way can we guarantee the horizontal and vertical accuracy of large scale photogrammetric mapping.

scholarly journals Practice of Small and Medium UAV in Large Scale Topographic Map

2020 ◽  
Vol 5 (1) ◽  
pp. 7-8
Author(s):  
Yuxue Wei ◽  
Keyword(s):  
Large Scale ◽  
Topographic Mapping ◽  
Topographic Map ◽  
Engineering Construction ◽  
Aerial Photogrammetry ◽  
Small Uav ◽  
Cadastral Surveying ◽  
Terrain Elevation ◽  
Planning And Construction ◽  
Surveying And Mapping

As a basic surveying and mapping work, small uav has been widely used in large scale topographic mapping. According to the needs of production and construction, digital mapping methods and aerial photogrammetry are used to provide technical support for large scale topographic mapping in engineering construction surveying and mapping, urban planning and construction, cadastral surveying and other directions. In order to control the small uav in the terrain elevation information, mapping proportion accuracy and other aspects to get better improvement, the practice of small uav in large scale topographic map is deeply analyzed, in order to understand the practical application value of small uav in large scale topographic map.

scholarly journals Map of the Mount Gongga Glacier: A Combination of Terrestrial and Aerial Photogrammetry

1986 ◽  
Vol 8 ◽  
pp. 34-36
Author(s):  
Chen Jianming
Keyword(s):  
Large Scale ◽  
Aerial Photographs ◽  
High Mountain ◽  
Survey Area ◽  
Mountain Glacier ◽  
Practical Result ◽  
Topographic Features ◽  
Aerial Photogrammetry ◽  
Set Up ◽  
Surveying And Mapping

For use in glaciological research, between 1982 and 1984, we succeeded in surveying and mapping the Mount Gongga Glacier, on a scale of 1:25 000, by means of a combination of terrestrial and aerial photogrammetry. This paper describes the method in detail. In the survey area, we set up an independent, triangulation network, with microwave distance measurement, and two, independent, straight-line traverses, for basic control. Control points were observed by intersection. The terrestrial, photogrammetric baselines were projected and corrected into distances on the. plane of the map. Terrestrial photography accounted for the majority of the photographs of the survey area. Surveying and mapping of planimetrie and topographic features were completed on a stereo-autograph, using plates mainly from terrestrial photogrammetry. Where these data were insufficient, they were supplemented by aerial photography, plotted on a photographic plotting instrument. Orientation points of the aerial photographs were established by terrestrial, photogrammetric analysis and located on the map by an optical, mechanical method. The practical result showed that a combination of terrestrial and aerial photogrammetry, in mapping a high, mountain, glacier area, on a large scale, is more feasible and flexible than other methods and more economical as well.

PHOTOGRAMMETRY IN MUNICIPAL SURVEYING AND MAPPING

1963 ◽  
Vol 17 (4) ◽  
pp. 340-351
Author(s):  
R. A. Brocklebank
Keyword(s):  
Large Scale ◽  
Statistical Data ◽  
Aerial Survey ◽  
Human History ◽  
Population Explosion ◽  
Surveying And Mapping

Map making is as old as recorded human history. The introduction of modern photogrammetric methods and the population explosion with the residtant growth of cities sets new requirements for municipal surveying and mapping. Nearly all large-scale mapping in Canada is done by commercial aerial survey companies. To assess the volume of the work involved, the author quotes some interesting statistical data and then discusses typical requirements and usual conditions under which photogrammetric mapping is carried out. There is an obvious lack of planning and standardization in this area, and the author makes several suggestions on how this situation could be improved.

scholarly journals Applications of GIS and Very High-Resolution RS Data for Urban Land Use Change Studies in Mongolia

2011 ◽  
Vol 2011 ◽  
pp. 1-8 ◽  
Author(s):  
D. Amarsaikhan ◽  
V. Battsengel ◽  
E. Egshiglen ◽  
R. Gantuya ◽  
D. Enkhjargal
Keyword(s):  
Land Use ◽  
High Resolution ◽  
Land Use Change ◽  
Large Scale ◽  
Land Use Changes ◽  
Urban Land ◽  
Urban Land Use ◽  
Capital City ◽  
Geographical Information ◽  
Topographic Map

The aim of this study is to analyze the urban land use changes occurred in the central part of Ulaanbaatar, the capital city of Mongolia, from 1930 to 2008 with a 10-year interval using geographical information system (GIS) and very high-resolution remote sensing (RS) data sets. As data sources, a large-scale topographic map, panchromatic and multispectral Quickbird images, and TerraSAR synthetic aperture radar (SAR) data are used. The primary urban land use database is developed using the topographic map of the study area and historical data about buildings. To extract updated land use information from the RS images, Quickbird and TerraSAR images are fused. For the fusion, ordinary and special image fusion techniques are used and the results are compared. For the final land use change analysis and RS image processing, ArcGIS and Erdas imagine systems installed in a PC environment are used. Overall, the study demonstrates that within the last few decades the central part of Ulaanbaatar city is urbanized very rapidly and became very dense.

scholarly journals THE NATURAL RESOURCES POTENTIAL AND PECULARITIES OF THEIR EXPLOITATION IN MOUTAINOUS REGIONS (THE CASE OF KVEMO RACHA, GEORGIA)

2021 ◽  
Author(s):  
Elene Salukvadze ◽  
Tamila Chaladze ◽  
Ketevan Gogidze
Keyword(s):  
Natural Resources ◽  
Large Scale ◽  
Mineral Resources ◽  
Topographic Map ◽  
Resource Potential ◽  
River Terraces ◽  
Ecological Resources ◽  
Information System Technology ◽  
Map Scale ◽  
The Right

To reveal natural resources of a region it is causally necessary to reveal and describe certain landscapes as far as they are means of manifesting natural resources. Besides they are subject of study of land management. It is important to identify resource potential and current state of landscapes and each of their components. Landscapes occupy certain areas which are characterized with certain natural conditions and, obviously, different natural potential. To study the above issues, we selected mountainous region of Kvemo Racha (Ambrolauri Municipality of Georgia). For the studies, together with literary material and different sources, we used cartographic material, the landscape maps (1970, 1983) and the topographic map (scale; 1:50000) of Georgia and Transcaucasia and the observation materials of the field expedition made in 2019 in Kvemo Racha. We constructed a large-scale landscape map for Kvemo Racha (Ambrolauri Municipality) by GIS (geographic information system) technology. The work describes individual natural components of landscapes and resource potential of the distinguished landscapes. The data on mineral resources, climate and agro-climate, soil and forest resources are given in the table and diagrams. Among the landscapes distinguished as a result of comprehensive studies, the landscapes in the Racha Depression on the right and left banks of the river Rioni have especially great potential. These landscapes are located on either sides of the Rioni river gorge, though the landscape on the right bank of the river is especially distinguished. This is Racha Depression with a synclinal river gorge, river terraces, juts at some places, humus-carbonate soils. It is a specific micro-zone on the southern slope of the Lechkhumi Ridge (450-750 m above sea level), with unique vine species (Aleksandrouli, Mujuretuli, Shavi (black) Kapistoni), which are used to produce naturally sweet and semisweet “Khvanchkara” type red wines known world-wide. The wealth of Racha – forest landscapes are also noteworthy as some of them have industrial, others have recreational and ecological resources and are of high significance for preserving the biodiversity in the region.

scholarly journals A MODIFIED PROJECTIVE TRANSFORMATION SCHEME FOR MOSAICKING MULTI-CAMERA IMAGING SYSTEM EQUIPPED ON A LARGE PAYLOAD FIXED-WING UAS

2015 ◽  
Vol XL-3/W2 ◽  
pp. 87-93 ◽  
Author(s):  
J. P. Jhan ◽  
Y. T. Li ◽  
J. Y. Rau
Keyword(s):  
Large Scale ◽  
Imaging System ◽  
Collection Efficiency ◽  
Projective Transformation ◽  
Operation Time ◽  
Bundle Adjustment ◽  
Aerial Images ◽  
Mountainous Area ◽  
Topographic Map ◽  
Camera System

In recent years, Unmanned Aerial System (UAS) has been applied to collect aerial images for mapping, disaster investigation, vegetation monitoring and etc. It is a higher mobility and lower risk platform for human operation, but the low payload and short operation time reduce the image collection efficiency. In this study, one nadir and four oblique consumer grade DSLR cameras composed multiple camera system is equipped on a large payload UAS, which is designed to collect large ground coverage images in an effective way. The field of view (FOV) is increased to 127 degree, which is thus suitable to collect disaster images in mountainous area. The synthetic acquired five images are registered and mosaicked as larger format virtual image for reducing the number of images, post processing time, and for easier stereo plotting. Instead of traditional image matching and applying bundle adjustment method to estimate transformation parameters, the IOPs and ROPs of multiple cameras are calibrated and derived the coefficients of modified projective transformation (MPT) model for image mosaicking. However, there are some uncertainty of indoor calibrated IOPs and ROPs since the different environment conditions as well as the vibration of UAS, which will cause misregistration effect of initial MPT results. Remaining residuals are analysed through tie points matching on overlapping area of initial MPT results, in which displacement and scale difference are introduced and corrected to modify the ROPs and IOPs for finer registration results. In this experiment, the internal accuracy of mosaic image is better than 0.5 pixels after correcting the systematic errors. Comparison between separate cameras and mosaic images through rigorous aerial triangulation are conducted, in which the RMSE of 5 control and 9 check points is less than 5 cm and 10 cm in planimetric and vertical directions, respectively, for all cases. It proves that the designed imaging system and the proposed scheme have potential to create large scale topographic map.

The Error Analysis of GPS-RTK Construction Stakeout

2013 ◽  
Vol 655-657 ◽  
pp. 1884-1888
Author(s):  
Jin Hong Xu ◽  
Ruo Li Yang ◽  
Bei Bei Zhang
Keyword(s):  
Error Analysis ◽  
Real Time ◽  
External Environment ◽  
Positioning Error ◽  
Positioning Accuracy ◽  
Gps Rtk ◽  
Satellite Signal ◽  
The Impact ◽  
Surveying And Mapping

GPS-RTK technology with real-time , high positioning accuracy and easy to operate features, is widely used in the filed of surveying and mapping; With the improvement of RTK technology, the initialize speed , results accuracy and reliability of the RTK survey will be increasingly higher.Due to the impact of the satellite signal and the external environment, the deviation of the RTK positioning and the lack of necessary checking conditions in RTK surveying, this paper will do some researches and analyses about RTK positioning error to serve the Survey and Mapping Engineering better.

scholarly journals A proposal of topographic map symbols for large-scale maps of urban areas in Brazil

2019 ◽  
Vol 1 ◽  
pp. 1-2
Author(s):  
Claudia Robbi Sluter ◽  
Silvana Philippi Camboim ◽  
Andrea Lopes Iescheck ◽  
Luciane Borges Pereira
Keyword(s):  
Land Use ◽  
Urban Areas ◽  
Large Scale ◽  
Topographic Maps ◽  
Topographic Mapping ◽  
Urban Landscapes ◽  
Topographic Map ◽  
Rural And Urban ◽  
Different Cultures ◽  
Theoretical Issues

<p><strong>Abstract.</strong> This paper addresses a historical issue in Brazil that is that topographic mapping has been performed without application of the theories of cartography to local reality. With the lack of research on this subject, the rules and standards for topographic mapping in Brazil are based on solutions that have been developed in other countries. Even though topographic maps are not a frequent topic of cartographic research, as cited by Kent (2009), when the methods, techniques, and standards are imported from other countries, they are established by considering different natural, rural, and urban landscapes; different histories of land use and occupation; and different cultures. Consequently, it is essential to develop studies that address the theoretical issues of topographic mapping and to verify their suitability to Brazilian reality, considering the geographical aspects that must be represented in topographic mapping. Such a foundation of scientific knowledge is essential to producing solutions that are adapted to the environmental conditions and needs of Brazilian users and society.</p>

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