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.
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