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Author:Hakala, Teemu
Title:Improvements, calibration and accuracy of the Finnish Geodetic Institute Field Goniospectrometer
Geodeettisen laitoksen kenttägoniospektrometrin parannukset, kalibraatio ja tarkkuus
Publication type:Master's thesis
Publication year:2009
Pages:v + 43      Language:   eng
Department/School:Sähkötekniikan laitos
Main subject:Automaatiotekniikka   (AS-84)
Supervisor:Halme, Aarne
Instructor:Peltoniemi, Jouni
Electronic version URL: http://urn.fi/URN:NBN:fi:aalto-201203071280
OEVS:
Electronic archive copy is available via Aalto Thesis Database.
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Location:P1 Ark S80     | Archive
Keywords:Finnish Geodetic Institute Field Goniometer
FIGIFIGO
spectrometry
BRF
BRDF
remote sensing
spektrometria
kaukokartoitus
Abstract (eng): This work presents the features of Finnish Geodetic Institute Field Goniospectrometer (FIGIFIGO), concentrating on recent improvements, calibrations, and accuracy of the device.
Several similar instruments by international research colleagues are introduced and the theories of bidirectional reflectance factor and bidirectional reflectance distribution function are briefly explained.
Some data are presented to give an idea of the measurement results.

FIGIFIGO is a device for multiangular reflectance factor measurements under field conditions.
Some most noteworthy features of the instrument, compared to similar devices, include: fast operation and assembly, high portability, possibility for both laboratory and field measurements, and high degree of automation.

The most important improvements to the system include: a sky camera for device orientation, optics with rotatable linear polarizer, and a fine tune mirror for spatial correction of optics footprint.
With the addition of these features, FIGIFIGO has became more reliable and accurate, and scientifically more useful.

Calibration of the system has increased the reliability of the data, and has provided the operators with information on how to operate the instrument most efficiently and accurately.
The utilization of this information translates directly to more reliable and scientifically more important data.
Abstract (fin): Tässä diplomityössä esitellään Geodeettisen laitoksen kenttägoniospektrometri, FIGIFIGO, siihen tehdyt kalibraatiot, tarkkuusmittaukset ja parannukset.
Työssä esitellään myös muita samankaltaisia laitteita, selitetään mittauksen teoria ja esitellään joitakin saatuja tuloksia.

FIGIFIGO on kenttäkäyttöön suunniteltu mittalaite, jolla voidaan määrittää erilaisista pinnoista heijastuneen valon spektri useista eri suunnista.
Tätä tietoa voidaan käyttää pintojen heijastavuuden mallintamiseen, satelliiteista saadun datan varmentamiseen ja ilmakuviin tehtäviin korjauksiin.

FIGIFIGO on suunniteltu mahdollisimman varmatoimiseksi, nopeaksi ja kevyeksi.
Tämän työn kuluessa laitteistoon on lisätty muun muassa kalansilmälinssillä varustettu kamera, jolla määritetään laitteen asento suhteessa aurinkoon, sekä uudet optiikat, joilla voi mitata valon polarisaatiota.
Nämä lisäykset ovat mahdollistaneet entistä monipuolisemmat mittaukset ja siten uusien tieteellisten tulosten hankkimisen.

Laitteiston kalibraatio on antanut lisää varmuutta saatujen tulosten oikeellisuudesta ja tarkkuustestien perusteella tehdyt muutokset ja parannukset ovat entisestään lisänneet laitteiston mittatarkkuutta ja luotettavuutta
ED:2009-07-21
INSSI record number: 38119
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