Results 11 to 20 of about 387 (179)

Structural and statistical properties of the collocation technique for error characterization [PDF]

Nonlinear Processes in Geophysics, 2012
The validation of geophysical data sets (e.g. derived from models, exploration techniques or remote sensing) presents a formidable challenge as all products are inherently different and subject to errors.
S. Zwieback, K. Scipal, W. Dorigo, W. Wagner   +3 more
doaj   +1 more source

Twomey effect observed from collocated microphysical and remote sensing measurements over shallow cumulus [PDF]

Journal of Geophysical Research: Atmospheres, 2014
Clear experimental evidence of the Twomey effect for shallow trade wind cumuli near Barbados is presented. Effective droplet radius (reff) and cloud optical thickness (τ), retrieved from helicopter‐borne spectral cloud‐reflected radiance measurements, and spectral cloud reflectivity (γλ) are correlated with collocated in situ observations of the number
F. Werner, F. Ditas, H. Siebert, M. Simmel, B. Wehner, P. Pilewskie, T. Schmeissner, R. A. Shaw, S. Hartmann, H. Wex, G. C. Roberts, M. Wendisch   +11 more
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A Reference-Free Method for the Thematic Accuracy Estimation of Global Land Cover Products Based on the Triple Collocation Approach

Remote Sensing, 2023
Global land cover (GLC) data are an indispensable resource for understanding the relationship between human activities and the natural environment. Estimating their classification accuracy is significant for studying environmental change and sustainable ...
Pengfei Chen, Huabing Huang, Wenzhong Shi, Rui Chen   +3 more
doaj   +1 more source

Tropospheric water vapor: a comprehensive high-resolution data collection for the transnational Upper Rhine Graben region [PDF]

Earth System Science Data, 2022
Tropospheric water vapor is one of the most important trace gases of the Earth's climate system, and its temporal and spatial distribution is critical for the genesis of clouds and precipitation.
B. Fersch, A. Wagner, B. Kamm, E. Shehaj, A. Schenk, P. Yuan, A. Geiger, G. Moeller, B. Heck, S. Hinz, H. Kutterer, H. Kunstmann, H. Kunstmann   +12 more
doaj   +1 more source

On the spatio-temporal representativeness of observations [PDF]

Atmospheric Chemistry and Physics, 2017
The discontinuous spatio-temporal sampling of observations has an impact when using them to construct climatologies or evaluate models. Here we provide estimates of this so-called representation error for a range of timescales and length scales (semi ...
N. Schutgens, N. Schutgens, S. Tsyro, E. Gryspeerdt, E. Gryspeerdt, D. Goto, N. Weigum, M. Schulz, P. Stier   +8 more
doaj   +1 more source

Towards reliable retrievals of cloud droplet number for non-precipitating planetary boundary layer clouds and their susceptibility to aerosol

Frontiers in Remote Sensing, 2022
Remote sensing has been a key resource for developing extensive and detailed datasets for studying and constraining aerosol-cloud-climate interactions.
Romanos Foskinis, Romanos Foskinis, Athanasios Nenes, Athanasios Nenes, Alexandros Papayannis, Alexandros Papayannis, Paraskevi Georgakaki, Konstantinos Eleftheriadis, Stergios Vratolis, Maria I. Gini, Mika Komppula, Ville Vakkari, Ville Vakkari, Panos Kokkalis   +13 more
doaj   +1 more source

Indirect Validation of Ocean Remote Sensing Data via Numerical Model: An Example of Wave Heights from Altimeter

Remote Sensing, 2020
Using numerical model outputs as a bridge, an indirect validation method for remote sensing data was developed to increase the number of effective collocations between remote sensing data to be validated and reference data.
Haoyu Jiang
doaj   +1 more source

A Composite Method for Predicting Local Accuracies in Remotely Sensed Land-Cover Change Using Largely Non-Collocated Sample Data [PDF]

Remote Sensing, 2019
As in conventional error matrix-based accuracy assessments, collocated reference sample data are often used for characterizing per-pixel (local) accuracies in land-cover change maps so that local accuracy predictions can be made using direct methods. In that way, correctness in “from-to” change categorization at sample pixels is assessed and modeled ...
Yingying Mei, Jingxiong Zhang, Wangle Zhang, Fengzhu Liu   +3 more
openaire   +1 more source

Towards an Algorithm for Retrieval of the Parameters of the Marine Atmospheric Boundary Layer at High Wind Speeds Using Collocated Aircraft and Satellite Remote Sensing

Journal of Marine Science and Engineering, 2022
A method has been developed for the retrieval of the atmospheric boundary layer parameters in tropical cyclones, namely the dynamic speed, the wind speed at a 10 m height, and the roughness parameter. For the analysis, the wind speed profiles were obtained from NOAA GPS-dropsondes and collocated with the data from the Stepped-Frequency Microwave ...
Evgeny Poplavsky, Nikita Rusakov, Olga Ermakova, Daniil Sergeev, Yuliya Troitskaya   +4 more
openaire   +2 more sources

Automated ground-based remote sensing measurements of greenhouse gases at the Białystok site in comparison with collocated in situ measurements and model data [PDF]

Atmospheric Chemistry and Physics, 2011
Abstract. The in situ boundary layer measurement site in Białystok (Poland) has been upgraded with a fully automated observatory for total greenhouse gas column measurements. The automated Fourier Transform Spectrometer (FTS) complements the on-site in situ facilities and FTS solar absorption measurements have been recorded nearly continuously in clear
Messerschmidt, J., Chen, H., Deutscher, N., Gerbig, C., Grupe, P., Katrynski, K., Koch, F., Lavrič, J., Notholt, J., Rödenbeck, C., Ruhe, W., Warneke, T., Weinzierl, C.   +12 more
openaire   +5 more sources