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Remote sensing & field recording in Doñana: Why we need ground-thruth for long-term ecological monitoring through remote sensing

Ricardo Díaz-Delgado

on 15 March 2013

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Transcript of Ground-truth

Integrating remote sensing and field recording
at Doñana in SW Spain Ricardo Díaz-Delgado
Doñana Biological Station-CSIC
rdiaz@ebd.csic.es In Doñana, ground-truth is essential for
the features monitored at landscape scale In field data acquisition Customized Sequences Saving or sending records In case you are interested... Multi-scale ground-truth Field sampling design Main equipment & gadgets Main monitoring goals Empirical approaches need it! Assessment results Assignment of spectral classes to thematic classes Why ground-truth is so critical? Real features on the ground have to be related to image data One of the remote sensing classical paradigms How accurate our model/classification is?
or how replicable is? Marshland flooding & hydroperiod mapping
Water depth and turbidity
Aquatic vegetation mapping including alien ssp Pre and post-campaign flights
Horse riding & canoeing for long transects
Drone operation for detailed features mapping
Crane for canopy-scaling
Field radiommetric measurements
Laboratory spectroscopy Step by step data acquisition Computer sync &
desktop analysis contact our Experienced Sequence Designer
Hugo LeFranc (h.lefranc@gmail.com) In remote sensing, one can't see the trees for the forest... What pixels are flooded? When inundation levels matter for bird breeding or macrophyte growth Flooded?... but...when ? or just Flat
Contrasted features For quantitative remote sensing For remote sensing classification Receiver Operating Characteristic (ROC) Integrated Long-Term Ecological Monitoring Program Since 2002 more than 100 standardized and validated protocols including monitoring at landscape scale through RS (s.l.) For probabilities (presence/absence) or percent cover (subpixel approaches) Focusing in the challenging monitoring of Doñana marshland habitats Logistic issues Harsh environment
Large marshland extent Ancillary data from permanent field stations Automatic water probes
Limnimetrical scales (water-level)
Meteorological stations
Eddy Covariance Towers for ETP & C
Radiommetric sensors (APOGEE)
Sky-NDVI on ground sensors
Webcams Wireless or GSM connection to central datawarehouse Now for Android Whenever using RS in wild areas always consider ground-truth sampling for training and testing
Wetlands RS monitoring needs much more detailed field work design and careful planning
Automatic deployments together with new technologies for field data acquisition greatly improve efficiency in ground-truth
Multi-scale RS approaches help to target on specific features and apply both quantitative and qualitative RS techniques From our experience Watch the presentation at http://goo.gl/R2Avq European hotspot for Biodiversity Focus on:
Processes Our Example: Landsat TM RGB 543
Path 202 Row 34 Terrestrial Natura 2000 Monitoring Workshop. Swansea March 2013 then, one should go for homogeneous training areas accounting for maximum variability Monthly aerial census Many observers can be contributing to the same database on real time Controlling for:
Plant ssp
% cover
Endmember collection Transect delineation according to updated remote sensing images
Planning of airborne campaigns (AHS+CASI) and coincident Landsat & CHRIS-Proba acquisitions
Selection of locations for radiommetric measurements & of target features (i.e. Azolla, Spartina…) for spectral signatures
High & low radiance references for radiommetric corrections
Scheduling staff teams, cars and equipment plus lodging and horses (RBD facilities) ready Field spectro-radiometers and microtops for optical density estimation
Pole for water depth measurements and zenithal pictures
Differential GPS for endmember delineation
Set up of permanent GPS station for post-processing airborne geometric correction
Multiparametric probes (conductivity, chlorophyll, turbidity)
Pixy drone for mapping of local features
Portable water-proof PDAs with customized Cybertracker sequence http://icts.ebd.csic.es
Full transcript