Documentation of landslides and inaccessible parts of a mine using an unmanned uav system and methods of digital terrestrial photogrammetry

Quite a big boom has recently been experienced in the technology of unmanned aerial vehicles (UAV). In conjunction with dense matching system, it gives one a powerful tool for the creation of digital terrain models and orthophotomaps. This system was used for the documentation of landslides and inaccessible parts of the Nástup Tušimice mine in the North Bohemian Brown Coal Basin (Czech Republic). The images were taken by the GATEWING X100 unmanned system that automatically executed photo flights an area of interest. For detailed documentation of selected parts of the mine, we used the method of digital terrestrial photogrammetry. The main objective was to find a suitable measurement technology for operational targeting of landslides and inaccessible parts of the mine, in order to prepare the basics for remediation work

National Report for the IAG of the IUGG 2019-2022

Major results of researches conducted by Russian geodesists in 2019-2022 on the topics of the International Association of Geodesy (IAG) of the International Union of Geodesy and Geophysics (IUGG) are presented in this issue. This report is prepared by the Section of Geodesy of the National Geophysical Committee of Russia. In the report prepared for the XXVII General Assembly of IUGG (Germany, Berlin, 11-20 July 2023), the results of principal researches in geodesy, geodynamics, gravimetry, in the studies of geodetic reference frame creation and development, Earth's shape and gravity field, Earth's rotation, geodetic theory, its application and some other directions are briefly described. For some objective reasons not all results obtained by Russian scientists on the field of geodesy are included in the report.Comment: Misprint in the title of the arXiv record has been corrected. The submission content is not affecte

A comparison analysis of different photogrammetric softcopies for geodata production

Up-to-date mapping technologies for geodata production are widely applicable in Remote Sensing and Photogrammetry Communities. Therefore, the education in Remote Sensing and photogrammetric methods becomes very important using different image processing software for the terrain mapping purposes, spatial data modelling, etc. The use of new methods, technologies and professional widely-known systems demonstrates the desire to increase mapping capability. Despite that, digital didactics photogrammetric systems might be used (particularly in education process) simultaneously, this way getting more efficiency results. The objective of the research is to analyse some aspects of the use of digital photogrammetric softcopies, applied for terrain mapping: professional IMAGE ERDAS with LPS, LISA and Didactics Digital Photogrammetric Systems (DDPS). The experimental investigations lead to contiguity of this different software in consideration of the following criteria: accuracy, flexibility and time. The digital terrain models and orthophoto maps, created using two technologies, are almost the same due to time required for separate image processing steps. However, full workflow on DDPS requires about 2.5 times less time than on LPS. The photogrammetric measurement results demonstrate that there are some differences in accuracy due to stereoscopic measurements. When processing the images, the defined value of accuracy estimators meets the requirements for topographic mapping; however, DEM needs a separate study

Requirements for aerial photography

The photogrammetric mapping process at the first stage requires planning of aerial photography. Aerial photographs quality depends on the successfull photographic mission specified by requirements that meet not only Lithuanian needs, but also the requirements of the European Union. For such a purpose the detailed specifications for aerial photographic mission for mapping urban territories at a large scale are investigated. The aerial photography parameters and requirements for flight planning, photographic strips, overlaps, aerial camera and film are outlined. The scale of photography, flying height and method for photogrammetric mapping is foreseen as well as tolerances of photographs tilt and swings round (yaw) are presented. Digital camera based on CCD sensors and on‐board GPS is greatly appreciated in present‐day technologies undertaking aerial mission. Article in English Reikalavimai, keliami aerofotonuotraukai Santrauka. Pirmuoju fotogrametrinio kartografavimo etapu parengiamas projektas žemes paviršiui aerofotografuoti. Aerofotonuotraukos kokybe priklauso nuo aerofotografavimo proceso sekmingumo, t. y. fotogrametriniu reikalavimu, keliamu aerofotonuotraukai, tinkamo igyvendinimo – ne tik pagal Lietuvos poreikius, bet ir Europos Sajungos nuostatas. Pateikiami tikslingiausi aerofotonuotraukos parametrai skaitmeniniams spalvotiems 1:1000 arba 1:2000 masteliu nuotraukos Lietuvos miestu ortofotografiniams žemelapiams sudaryti. Rengiant urbanizuotu teritoriju aerofotografavimo parametrus ir siekiant gauti geros kokybes, tikslius ortofotografinius žemelapius, remtasi literatūros šaltiniais, Lietuvos ir kai kuriu užsienio šaliu instituciju patirtimi. Aeronuotrauka projektuojama 1:5000 arba 1:6000 mastelio, aerofotokameros židinio nuotolis c = 210 mm. Pateikti tinkamo aerofotografavimo reikalavimai: aerofotonuotrauku tarpusavio sanklota, maršrutu nuokrypiai, aerofotografiniu vaizdu polinkiai, aerofotografavimo salygos. Nurodytos aerofotografavimo technines priemones: orlaivio ypatumai, aerofotografavimo kameru parametrai. Aerofotoaparato skiriamajai gebai apibrežti taikyta svertine vidutine skiriamoji geba (1 pav., 2 lentele). Kadangi vis dažniau skaitmenines aerofotokameros naudojamos topografijos poreikiams, todel kitu Lietuvos urbanizuotu teritoriju aerofotogrametrinio kartografavimo etapu numatoma taikyti ir skaitmenine aerofotografavimo sistema. Raktažodžiai: aerofotografavimas, fotogrametrine nuotrauka, parametrai, lektuvu GPS, kalibravimas

Analysis of camera orientation variation in airborne photogrammetry: images under tilt (roll-pitch-yaw) angles

Taking images for airborne photogrammetry, tilt angles (drifts) variations of camera are resulting to objects positions on the images therefore influence to correctness and accuracy of produced geodata. Several experiments have been done for investigation of camera’s roll-pitch-yaw angles determination regarding to technical flying means orientation in the space. Using aerial triangulation technique, exterior orientation parameters of each image from entire flight strip – projection center coordinates and image tilt angles with estimated accuracy are presented. Results show coincidences or discrepancies to requirements specified in aerial photography regulations. In order to investigate deflections of camera’s tilts, stereo pair of images has been processed using airborne photogrammetric approach and different software. Two digital photogrammetric software (DDPS and LISA PHOTO) used in experimental image orientation operates on particular algorithms. Determined values of exterior orientation parameters differ not significantly. Exterior orientation of images gained by Unmanned Aerial Vehicle (UAV) with mounted CCD camera has been done. As shows analysis, images from UAV Photogrammetry are under marketable tilts. Using a certain number of Ground Control Points (GCP) measured by GPS, exterior orientation was not possible; the results not meet the accuracy requirements

Remote Sensing of Earth Resources: A literature survey with indexes (1970 - 1973 supplement). Section 1: Abstracts

Abstracts of reports, articles, and other documents introduced into the NASA scientific and technical information system between March 1970 and December 1973 are presented in the following areas: agriculture and forestry, environmental changes and cultural resources, geodesy and cartography, geology and mineral resources, oceanography and marine resources, hydrology and water management, data processing and distribution systems, instrumentation and sensors, and economic analysis

Investigation of the accuracy of determining planned and altitude coordinates based on survey data by unmanned aerial vehicles

Experimental studies of the accuracy of determining the plan and altitude coordinates were obtained from aerial photography materials and measured by a satellite receiver in real time. The study was conducted for aerial photography materials obtained from heights of 100 and 200 meters. In addition, the accuracy researched of using a different number of ground control points for georeferencing images – 18 and 5. Accuracy assessment was performed separately for the plain area and the area with rugged terrain

On the question of definition of the subject area of research in the specialty "Geodesy and land surveying"

The article discusses the content of the subject area of research introduced in 2015 in Ukraine specialty "Geodesy and Land Management" as a set of all subjects, the properties of which and the relationship between which should be considered in the relevant scientific theory. Based on the established practice of research work, as well as international approaches to determining the subject of modern geodesy and land management, it is proposed to identify five subsets of research areas (specializations): geodesy and cartography; geoinformatics and aerospace research of the Earth; land cadastre; land management; land management. For each of the subsets of the subject area of research, a detailed description of the subject orientation is proposed, which allows to specify the context and content of the relevant research. Key words: geodesy, land surveying, subject area, field of research, doctor of philosophy, master, bachelor

Earth resources: A continuing bibliography (issue 26)

This bibliography lists 480 reports, articles, and other documents introduced into the NASA scientific and technical information system between April 1, 1980 and June 30, 1980. Emphasis is placed on the use of remote sensing and geophysical instrumentation in spacecraft and aircraft to survey and inventory natural resources and urban areas. Subject matter is grouped according to agriculture and forestry, environmental changes and cultural resources, geodesy and cartography, geology and mineral resources, hydrology and water management, data processing and distribution systems, instrumentation and sensors, and economic analysis

Earth Resources: A continuing bibliography with indexes, issue 6, December 1975

This bibliography lists 484 reports, articles, and other documents introduced into the NASA scientific and technical information system between April 1975 and June 1975. Emphasis is placed on the use of remote sensing and geophysical instrumentation in spacecraft and aircraft to survey and inventory natural resources and urban areas. Subject matter is grouped according to agriculture and forestry, environmental changes and cultural resources, geodesy and cartography, geology and mineral resources, hydrology and water management, data processing and distribution systems, instrumentation and sensors, and economic analysis