The geodetic software DRAGSENS is used for the exact position estimation of a towed body, sensor, camera, array or net, dragged behind a ship, aircraft or vehicle. The position is calculated from the NMEA records of the GPS receiver and the vertical and horizontal distance parameters to the GPS position of the GPS antenna. The software allows a real-time estimation of the position of a dragged sensor based on the location of a GPS-receiver. The sensor thereby can be dragged underwater, at water or earth surface or by airborne. The software calculates the position of the sensor along the direction opposite to the course by compensation of the drift rate, the rolling and the cornering ability of the towing vehicle.
DRAGSENS receives current position data from a standard GPS string (RMC string). From these positions it averages a direction vector. Knowing the length of the tow cable, and the sensor depth, the sensor position is estimated and output in both kilometric and geographic formats. Suitable coefficients help keeping this estimation precise, considering, for example, the cable not as a straight line but as a parabolic arch.
DRAGSENS runs under Microsoft Windows and uses two independent serial ports. That also may be USB ports, controlled by a serial port driver. The input port receives the standard position data from the NMEA bus, while the output port gives the sensor position back in both geographic and kilometric format. Several strings with coordinates in different Coordinate Systems, date / time and additional information are broadcast on the second serial port. They all follow the NMEA standard for the RMC specifications including the checksum bit for transfer controlling.
This software at first was developed to add geodetic tags as an overlay with modern UTM coordinates on the footage taken by a towed underwater video camera. With suitable hardware the program delivers a video image, coming from a towed video camera, with the position as numeric overlay. It will also return the position of any towed sensor, including hydrophones, airguns, sonars or even nets. With minor modifications it could be used to estimate the position of objects on the ground during survey flights.
The free test version of the program with a detailed user manual can be downloaded as ZIP packed file by the Internet. For unpacking the download file you need an unzip program, which you can download from this side.
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BY-KanU and BWTA2017
Bavaria and Baden-Wuerttemberg are developing close-meshed grid files for the transformation of geodata in real estate cadastres to UTM/ETRS89.
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The new geodetic Reference System GDA2020 of Australia is supported by TRANSDAT and GeoDLL now. See the list of CRS...
"Geodata Germany" has been updated on the data conditions of January 1st, 2017. The database contains Towns and Municipalities, Town Districts, Coordinates, Postal Codes, Dialing Codes etc.
A new release ot "Geodata International" is available since March 2017. The database contains 256 contry files with Towns and Municipalities, Town Districts, Coordinates, Postal Codes etc.
GeoDLL / TRANSDAT
Proposal for using Polygonal Validity Scopes in NTv2 grid files.
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WINDOWS© 10 compatible
Our software has got the certificate "WINDOWS© 10 compatible". So it complies with the compatibility standards of the Microsoft operating systems WINDOWS© 10.
GeoDLL provides Time Zone Calculations with aspect to Maritime Territorial Limits.
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TRANSDAT / GeoDLL
The program and the DLL now support all HARN / HPGN Reference Systems of the United States.
The programs TRANSDAT and SEVENPAR support language files for the programs interface. Since the language dependent texts are managed in external files, new languages can be added at any time by creating new language files. Everybody who is interested can translate a new language file into his native language for himself and all users.