IEEE Geoscience and Remote Sensing Magazine - June 2013 - 43

table 1. liSt oF MetaData VariableS aDopteD For the accoMpliShMent oF SpectroraDioMetric
FielD SurVeyS, MoDeleD on Specchio DatabaSe requireMentS [31].
Group

Variable

DeScription

General/campaign

campaign name

name of the sampling campaign

campaign description

textual information about the campaign

investigator

Person responsible for the campaign

File path

File system path to the spectral campaign data

capturing date and time

date and time of the sampling in Utc

Latitude

spatial sampling position

Spatial and temporal
information

Longitude
altitude
target information

Sampling geometry

target homogeneity

Based on corine land cover (ec dG Xi, 1993)

spectrum name

scientific and common names of the target

target type

rsL internal designation of target type, e.g., snow, pasture

Hand sample

id name of the sample directly collected in the field

Pictures

images depicting the target

sensor zenith angle

measured from nadir, i.e., nadir = 0

sensor azimut angle

relative to the illumination angle, i.e., 180° for the principal plane opposite of
illumination source
distance of the sensor to the target

sensor distance

Measurement
details

environmental
conditions

File information

Homogeneous or heterogeneous

Landcover type

illumination zenith angle

illumination source zenith angle measured from nadir

illumination azimuth angle

measured from geographic north

illumination distance

distance between the illumination source and target

number of averaged spectra

number of spectra averaged internally by the instrument

White reference

White reference panel used

White inter-calibration

inter-calibration between Lab and Field reference

sensor

sensor model

instrument

specific instrument identified by a serial number

instrument calibration number

number of the instrument calibration

Foreoptic

additional optic than changes the field of view (FoV) in degrees

illumination source

type of illumination source, e.g., sun, Hg lamp

sampling environment

Field or laboratory

measurement type

single, directional, temporal

measurement unit

reflectance, digital numbers, radiance, absorbance

Goniometer model

name of the goniometer used

cloud cover

amount of clouds covering the sky defined in octas

ambient temperature

air temperature in degrees

air pressure

air pressure in hPa

relative humidity

relative humidity as percentage

Wind speed

Qualitative description of the wind speed: calm, breezy, windy, stormy

Wind direction

direction classes in 45° steps, measured from geographic north

auto number

automatic, consecutive number assigned by the spectroradiometer capturing software

User comment

comment added by the user

spectral file name

name of the spectral file

File format
data structuring information

File format of the spectral file
Hierarchical structure as gleaned from folder structure

as a file system structure. By using a simple client
application based on a Graphical User Interface the
user enters a query into the database, thus starting the
information retrieval process. Data management and
information retrieval therefore become very efficient
and can be used during the survey in order to contextually verify the proper data collection and avoid
june 2013

ieee Geoscience and remote sensinG maGazine

errors and redundancy. Interactivity allows the user
to perform some distortion removal (as for the water
absorption bands), and some statistical calculation on
the dataset (i.e., mean/median calculation of targets
response, intra/inter-variability of spectra, spectral
resampling). Some examples of those possibilities are
illustrated in Section 3.
43



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