GGF - Geoid Grid File скачать в хорошем качестве

GGF - Geoid Grid File

Do you want to see more videos like this? Then subscribe and turn on notifications! Don't forget to subscribe to my YouTube channel and RuTube channel. Rutube : https://rutube.ru/video/6080fb4517d30... Program implementira robusno citanje i analizu geoidnog modela iz binarnog GGF (Geoid Grid File) formata, sa fokusom na detekciju formata, kompresije i validnosti podataka za globalne geodetske primene. Ulazni GGF fajl sadrzi mrezu geoidnih separacija u WGS84 (World Geodetic System 1984) datumu, organizovanu u pravougaonu mrezu sa deklarisanim dimenzijama i opcionim geografskim granicama u zaglavlju. Algoritam robusno parsira zaglavlje GGF fajla, ekstrakcijom kljucnih metapodataka: naziva geoidnog modela, dimenzija pravougaone mreze, kao i geografskih granica u vidu minimalnih i maksimalnih vrednosti latituda i longitude. Ako granice nisu dostupne u zaglavlju, primenjuje se heuristicki fallback mehanizam zasnovan na nazivu fajla i dimenzijama mreze za detekciju regiona (npr. USA, Australija, Evropa, Rusija, Juzna Amerika, Azija, Afrika). Detektuje kompresovane fajlove na osnovu odnosa stvarnog broja podataka i deklarisanih dimenzija, i razlikuje stvarne nule (validne separacije = 0 m) od laznih nula (nedostajuci podaci zbog kompresije ili greske). cita i rekonstruise 2D niz separacija koristeci floor-indeksaciju unutar regularne mreze. Ovaj pristup osigurava tacnu rekonstrukciju pune mreze cak i u slucaju kompresovanih ili nepotpunih fajlova, uz implicitnu toleranciju na numericke greske u granicama domena. Ovako rekonstruisana matrica predstavlja kompletnu, regularnu reprezentaciju geoidnog polja u GGF formatu, spremnu za dalju analizu. Program podrzava ulaz uzoraka tacaka iz TXT fajla (format: LAT,LON) ili generise podrazumevane uzorke za testiranje. Zapisivanje detaljnih rezultata u TXT formatu za dalju geodetsku obradu i validaciju. Ovaj alat omogucava visoku pouzdanost u radu sa globalnim GGF modelima, posebno za terenske primene u geodeziji. The library provides for full reading and processing of geoid models in the binary GGF format with focus on format detection, compression, and validity of data for global geodetic applications. The input GGF file contains a grid of geoid separations in the WGS84 (World Geodetic System 1984) datum. The number of rows and columns that constitute the grid are declared in the header along with declared optional geographic boundaries. The algorithm robustly parses the GGF file header for key metadata, which includes the geoid model name, rectangular grid dimensions, and geographic boundaries represented as minimum and maximum latitude and longitude values. In the case where the header lacks this boundary information, a heuristic fallback is utilized, leveraging filename and grid dimensions to detect regions such as USA, Australia, Europe, Russia, South America, Asia, and Africa. It detects whether a file is compressed based on the ratio of actual data points versus declared dimensions and further differentiates real zeros-those that are separation = 0 m-from fake zeros, which represent missing data because of compression or errors. It reads and reconstructs the 2D separation array using floor-indexing within the regular grid. This approach lets one reconstruct the full grid with an accurate method even when the source file is compressed or incomplete, implicitly allowing for numerical errors in domain boundaries. This reconstructed matrix is a complete and regular representation of the geoid field in GGF format and is ready to be analyzed. The program allows for the input of sample points from TXT files (format: LAT,LON) or generates default samples for testing. It writes detailed results in TXT format for further geodetic processing and validation. The developed tool grants high reliability when working with Global GGF models, especially for field applications concerning geodesy. RuTube Channel : https://rutube.ru/channel/1400643/ Youtube Channel :    / @lazicgeoalati   LinkeDin :   / sasalazic   SrbsBuk : https://srbsbuk.com/members-2/donlaki/ Telegram : https://t.me/geoalatiplus web pages: http://geoalatiplus.in.rs #gnss #gps #agro #agriculture #latitude #longitude #geodetic #geodesy #surveyor #survey #surveying #srbija #projection #ellipsoid #etrs #etrf #itrs #itrf #landsurveyor #geo #геодезия #геодезија #geodezija #WGS #pravougle #koordinate #cors #latitude #longitude #agros #rgz #GNSS #PPP #RTK #Navigacija #Inzenjerstvo #GLONASS #GPS #Galileo #BeiDou #NavIC #NaukaITehnologija