Gravimetry Network Adjustments

Gravimetry Network Adjustments

A program for android GravNet+ is used to adjust gravity measurements.

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The stations with known gravity values (fixed points) are used as the reference points of the network, while the relative measurements represents the gravity differences between the points. Before starting the adjustment procedure using the least-square technique
you need to prepare gravity differences for each line of polygon based on original field measurements. The adjustment results are estimated values of gravity for all network points, along with their accuracy estimates.

 First field represents the point name, station name, where semicolon (;) is used as a field separator for all input files. Second field contains values FIX or FLOAT. FIX value defines known point (position), while FLOAT value defines points which are being adjusted.

Empty line separates second block which defines input parameters. Separator -- distinguishes the direction. Therefore value A--B presents the measuring direction of gravity difference from point A to point B. Gravimetric differences influenced by (recommendation) temperature, pressure, gravimeter drift and the time interval needed to change position between the points, expressed in hours (last column).

Example :

A;FIX;100.0
B;FLOAT;0
C;FLOAT;0
D;FLOAT;0
E;FLOAT;0
F;FLOAT;0
G;FLOAT;0

A--B;0.143;2
B--A;-0.143;2
B--C;2.370;3
C--D;1.437;4
D--E;-0.897;2
E--F;-0.414;3
F--C;0.880;4
C--F;-0.779;4
F--B;-0.591;3
F--A;-0.635;5
F--G;1.206;6
G--F;-1.201;6

Program omogucava izravnanje gravimetrijske mreze. Poznata tacka se oznacava sa tekstom FIX. Pre startovanja mora se pripremiti ulazni fajl za svaku liniju poligona.

Prvo polje predstavlja ime tacke, stajalista, tacka zarez je separator. Posle imena tacke sledi oznaka FIX ili FLOAT. Oznaka FIX definise poznatu tacku, dok oznaka FLOAT definise tacke koje su predmet izravnanja.

Nakon unetog prvog bloka tacaka sledi prazan red (nije obavezan) sa sledecim blokom podataka koji definise ulazne parametre, merene ili priblizne vrednosti. Oznaka -- oznacava pravac. Dakle 1--2 predstavlja pravac merenja gravimetrijske razlike od tacke 1 ka tacki 2. Zatim sledi separator tacka zarez, pa vrednost gravimetrijske razlike na kraju vreme u satima prilikom prebacivanja gravimetra od tacke do tacke.

download examples 1 : HERE

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