Data reduction and QC Perfect high-quality solution for your meter

Processing to fully corrected Free Air grids from Air/Sea II & MGS-6 meters

Fast, easy to use wizard. Process daily or on cruise completion

Make informed changes to survey design while survey is in progress to maximize geological understanding.

Use a range of: Spatial Datums, Projection & Gravitational Datums

Performs De-correlation and noise filtering

Corrects off-sets and performs base ties (at cruise port) Converts meter reading units to absolute gravity

Eötvös and Earth Tide corrections applied to observed gravity

Edit cruise data from corrected gravity in linked Profile, Map or Table views

Split lines and levelPerforms a network adjustment

using cross-overs as controls

Reporting, task-file creationDatabase editing, re-gridding, re-filtering

Outputs: Intrepid and Oasis formats

Micro-g LaCoste – Gravimeter

> Profile views Filtering Stage

Top, Middle and Lower: Spring Tension, Beam and VVC

(red) displayed above the same profiles of raw gravity (blue)

> Use mouse-mode or polygon-select to edit (null) cruise

data from corrected corrected gravity in linked views.> Free Air products

Gridded Levelled Free Air gravity map

Sea-g:

� a data reduction & QC tool

� intuitive, easy to use wizard interface

� valuable for end-of-cruise-day rapid compilation of Free Air Maps

� easy to add new cruise-day data to a cumulated database

� also for post-cruise processing

A new paradigm:

� De-risk your marine data acquisition operations using close-to real time software

� Is highly suitable for on-ship use by a trained software operator but not a highly

technical operator, or senior geophysicist

� Save costs on cruise-staff

� Avoid extra days of cruise time

� Avoid realisation of poor survey design in the post-cruise phase!

Cost efficient marine operations:

� Data reduction reports with fully corrected Free Gravity maps can be emailed

each 24 hours to onshore managers

� Inappropriate survey design can be identified early (during the survey within 1-2

days of meter observations)

� Adjust survey designs, for example: (1) begin a tighter cruise-line spacing to

better resolve smaller than expected gravity anomalies, (2) alter cruise-line

orientation, or (3) collect a repeat-line before the ship leaves the area.

� Avoid wasting cruise-days collecting poor or insufficient data !

‘sea-g’ package includes:

� ‘sea-g’ Wizard Application

� Training manual with example datasets

� Technical support and upgrades

� Includes underlying INTREPID software modules: import, projection, editing,

visualisation, gridding, editing, composition, data extraction

Sea-g – Single cruise processing to Free Air

Import Raw from Meter

Filter & Correct

Line Split, Analyse Repeats & Level

Grid & Report

Sea-g

flo

wch

art

–S

ing

le c

ruis

e p

roc

es

sin

g t

o F

ree

Air

MG

S-6

or

air

se

a I

I

me

ters

Cru

ise d

efi

nit

ion

—Sea-g

sup

po

rts

sin

gle

cru

ise

da

ta

—S

am

e s

hip

/ s

am

e m

ete

r in

sta

lla

tio

n &

se

t-u

p

—U

p t

o 2

sti

ll-p

ort

re

ad

ing

s (b

efo

re/a

fte

r)

—M

ore

th

an

15

da

ys o

f cr

uis

e d

ata

—D

ata

ma

y b

e c

on

tig

uo

us

or

no

n-c

on

tig

uo

us

da

ys

—M

ult

iple

inp

ut

da

ta f

ile

s

1.

Se

lect

Pro

ject

[s

et

wo

rkin

g p

ath

/ d

ire

cto

ry]

3.

Est

ab

lish

Gra

vit

y M

ete

r S

ett

ing

s [R

evie

w /

ed

it c

ali

bra

tio

n d

ata

]

5.

Vie

w P

rofi

les

[te

mp

ora

l /sp

ati

al d

ata

str

ea

m –

cho

ose

dis

pla

ys]

8.

Ed

it c

ruis

e d

ata

[n

ull

se

gm

en

ts]

fro

m c

orr

ect

ed

gra

vit

y (

e.g

., T

rim

to s

urv

ey d

esi

gn

, re

mo

ve c

ruis

e t

urn

s)

9.

Sp

lit

the

cru

ise

da

ta in

to a

ne

w l

ine

s d

ata

ba

se [

at

nu

lls]

. A

na

lyse

Re

pe

at

Lin

e s

ets

. S

et

‘Ig

no

re’

lin

es

for

leve

lin

g/g

rid

din

g [

op

tio

na

l]

4.

Ou

tpu

t se

ttin

gs

[S

ele

ct o

utp

ut

dir

ect

ory

/ o

utp

ut

da

tab

ase

na

me

]

11

. G

rid

Fre

e A

ir A

no

ma

ly [

incl

ud

es

FA,

leve

lle

d F

A,

Dif

fere

nce

gri

ds]

Re

po

rts

an

d p

rod

uct

s.

7a

. A

pp

ly C

orr

ect

ion

s [E

ötv

ös,

Ea

rth

tid

e,

pla

tfo

rm m

oti

on

, d

rift

]

7.

Co

nve

rt r

aw

gra

vit

y t

o r

ela

tive

mG

al

6.

Ap

ply

Fil

ter

cho

ice

[F

ull

er,

Exa

ct B

lack

ma

n,

RC

]

Sp

litt

ing

& A

na

lysi

s

Gri

dd

ing

Co

rre

ctio

ns

Fil

teri

ng

Ra

w d

ata

im

po

rt

2.

Imp

ort

an

d P

rep

are

fo

r D

ata

Pro

cess

ing

10

a.

Vie

w m

is-c

losu

res,

ap

ply

lin

e p

rofi

le a

dju

stm

en

ts,

save

da

tab

ase

Cro

ss-o

ver

an

aly

sis

10

. Le

vel.

Ad

just

po

lyn

om

ial d

eg

ree

an

d r

ele

vel [

op

tio

na

l].

Leve

lin

g