AndreaBozzo/ceres-open-data-index huggingface dataset:
HIRDLS/Aura Level 3 Nitrogen Dioxide (NO2) 1deg Lat Zonal Fourier Coefficients V007 (H3ZFCNO2) at GES DISC

The "HIRDLS/Aura Level 3 Nitrogen Dioxide (NO2) Zonal Fourier Coefficients" version 7 data product (H3ZFCNO2) contains the entire mission (~3 years) of HIRDLS data expressed as zonal Fourier coefficients in 1 degree latitude bands from -64 to 80 degrees at 121 pressure levels. The coefficients are computed from the HIRDLS Level 2 profiles with a Kalman filter approach using both forward and backward passes in time. Expressed as the mean and up to 7 sine and cosine coefficients (4 waves for ascending and descending, 7 waves for combined), these coefficients may be used to compute values at any longitude. The data are provided on a pressure grid with 24 levels per decade, corresponding to about 1 km vertical resolution. The useful vertical range of the data is 100 to 5.1 hPa. The precision values are given by the root-mean square of the differences between the estimated fields and the input data.

The data are stored in the version 5 Hierarchical Data Format for the Earth Observing System (HDF-EOS5), which is an extension of the HDF5 format. Each file contains a zonal object with data for the entire mission with separate data fields for ascending (daytime), descending (nighttime), and combined orbit node.

Tags: atmosphere, atmospheric-chemistry, earth-science
Organization: National Aeronautics and Space Administration
GIBS Geospatial Data Abstraction Library (GDAL)

GDAL is an open source translator library for raster geospatial data formats that presents a single abstract data model to the calling application for all supported formats. By providing integration into the GDAL command line utilities, GIBS imagery can be easily included in imagery processing workflows, including bulk access.

Tags: digital, gdal, geography, imagery, maps, tiles
Organization: National Aeronautics and Space Administration
Mixture Density Mercer Kernels: A Method to Learn Kernels

This paper presents a method of generating Mercer Kernels from an ensemble of probabilistic mixture models, where each mixture model is generated from a Bayesian mixture density estimate. We show how to convert the ensemble estimates into a Mercer Kernel, describe the properties of this new kernel function, and give examples of the performance of this kernel on unsupervised clustering of synthetic data and also in the domain of unsupervised multispectral image understanding.

Tags: ames, dashlink, nasa
Organization: National Aeronautics and Space Administration
LVIS Classic L2 Geolocated Surface Elevation and Canopy Height Product V001

This data set contains Level-2 geolocated surface elevation and canopy height measurements collected by the NASA Land, Vegetation, and Ice Sensor (LVIS) Facility, an imaging lidar and camera sensor suite.

Tags: biosphere, cryosphere, earth-science, glaciers-ice-sheets, land-surface, sea-ice, topography, vegetation
Organization: National Aeronautics and Space Administration
GPM Ground Validation NASA ER-2 Navigation Data OLYMPEX V1

The GPM Ground Validation NASA ER-2 Navigation Data OLYMPEX dataset supplies navigation data collected by the NASA ER-2 aircraft for flights that occurred during November 9, 2015 through December 15, 2015 for one of the GPM Ground Validation field campaigns called the Olympic Mountains Experiment (OLYMPEX). This navigation dataset consists of multiple altitude, pressure, temperature parameters, airspeed, and ground speed measurements in ASCII, ASCII-IWG1, and XML data file formats.

Tags: earth-science, platform-characteristics, spectral-engineering
Organization: National Aeronautics and Space Administration
SMAP_L1B_SIGMA_NAUGHT_LOW_RES_QA_V003

SMAP Level 1B Sigma Naught Low Res Data Quality Info Version 3

Tags: active-remote-sensing, earth-observation-satellites, earth-remote-sensing-instruments, earth-science, imaging-radars, nasa-decadal-survey, platform-characteristics, radar, smap, spectral-engineering
Organization: National Aeronautics and Space Administration
Prognostics Enhanced Reconfigurable Control of Electro-Mechanical Actuators

Actuator systems are employed widely in aerospace, transportation and industrial processes to provide power to critical loads, such as aircraft control surfaces. They must operate reliably and accurately in order for the vehicle / process to complete successfully its designated mission. Incipient actuator failure conditions may severely endanger the operational integrity of the vehicle / process and compromise its mission. The ability to maintain a stable and credible operation, even in the presence of incipient failures, is of paramount importance to accomplish “must achieve” mission objectives. This paper introduces a novel methodology for the fault-tolerant design of critical subsystems, such as an ElectroMechanical Actuator (EMA), that takes advantage of on-line, real-time estimates of the Remaining Useful Life (RUL) or Time-to-Failure (TTF) of a failing component and reconfigures the available control authority by trading off system performance with control activity. The primary goal is to complete critical mission objectives within a time window dictated by prognostic algorithms so that the fault mode is accommodated and an acceptable level of performance maintained for the duration of the mission. The proposed fault-tolerant control design is mathematically rigorous, generic and applicable to a variety of application domains. An EMA is used to illustrate the efficacy of the proposed approach.

Tags: ames, dashlink, nasa
Organization: National Aeronautics and Space Administration
Prognostic Techniques for Capacitor Degradation and Health Monitoring

This paper discusses our initial efforts in constructing physics of failure models for electrolytic capacitors subjected to electrical stressors in DC-DC power converters. Electrolytic capacitors and MOSFET’s are known to be the primary causes for degradation and failure in DC-DC converter systems. We have employed a topological energy based modeling scheme based on the bond graph (BG) modeling language for building parametric models of multi-domain systems, such as motors and pumps. In previous work, we have conducted experimental studies to validate an empirical physics of failure model based on Arrhenius Law for equivalent series resistance (ESR) increase in electrolytic capacitors operating under nominal conditions. In this paper, our focus shifts to deriving first principle models of capacitor degradation that explain both the ESR increase and the decrease in capacitance over time when the capacitor is operated under electrical stress conditions. Experimental studies are run in parallel, and data collected from these studies are used to validate the generated models. In the future, they will also be used to compute model parameters, so that the overall goal of deriving accurate models of capacitor degradation, and using them to predict performance changes in DC-DC converters is realized.

Tags: ames, dashlink, nasa
Organization: National Aeronautics and Space Administration
Space Physics Data Facility (SPDF)

The Space Physics Data Facility (SPDF) is the archive of non-solar data for the Heliospheric Science Division (HSD) at NASA's Goddard Space Flight Center. Besides direct access to the data and documentation, SPDF also provides web-based services for survey and high resolution data and trajectories. The Facility supports data from most NASA Heliophysics missions to promote correlative and collaborative research across discipline and mission boundaries.

Tags: heliophysics, heliospheric, nasa, orbit, solar, space-physics, sun
Organization: National Aeronautics and Space Administration
High Mountain Asia LDAS 1 km Snow and Temperature Parameters V001

This data set provides daily-averaged NASA Land Information System (LIS) output at a spatial resolution of 1 km. LIS was driven by uncorrected Modern-Era Retrospective Analysis for Research and Applications, Version 2 (MERRA-2) data, using the Noah Multiparameterization Land Surface Model (Noah-MP). Modeled parameters include snow water equivalent (SWE), snow depth, surface temperature, and soil temperature profile.

Tags: atmosphere, atmospheric-temperature, earth-science, land-surface, snow-ice, soils, terrestrial-hydrosphere
Organization: National Aeronautics and Space Administration
HIRENASD Unstructured Grids - VGRID software FINAL

These grids were constructed using VGRID software from NASA Langley. The grids designed for node based (labeled 'nc') and cell-centered (labeled 'cc') solvers are supplied. Grids with mixed elements (labeled 'mixed') and tetrahedral elements (labeled 'tets') are supplied.

Each mixed elements tar-file contains grid in aflr3 .ugrid format and the corresponding .cgns file. Each tetrahedral elements tar-file contains grid in native VGRID format (.cogsg, .bc, .mapbc) and the corresponding .cgns file.

Some files were too large and had to be split into parts. To combine the parts, use cat filename_part1 filename_part2 > filename.

Grids are in units of 'mm'. Information about grids, that is number of nodes, elements, etc., is provided in AePW_HIRENASD_Grid_Statistics_VGRID_Final.docx

Please report any issues with these grids to Pawel.Chwalowski@nasa.gov


The mode shapes from NASTRAN interpolated on the surface mesh are available for some of the grids.  These files are in Tecplot format and units of 'meter.'

Please note that the coarse and medium grids for the mixed elements node based solvers are at the bottom of the list.

Tags: ames, dashlink, nasa
Organization: National Aeronautics and Space Administration
DMSP SSM/I-SSMIS Daily Polar Gridded Brightness Temperatures V006

This data set provides daily gridded brightness temperatures derived from passive microwave sensors and distributed in a polar stereographic projection. NSIDC produces daily gridded brightness temperatures from orbital swath data generated by the Special Sensor Microwave/Imager (SSM/I) aboard the Defense Meteorological Satellite Program (DMSP) F8, F11, and F13 platforms and the Special Sensor Microwave Imager/Sounder (SSMIS) aboard DMSP F17 and F18. The SSM/I and SSMIS channels used to calculate brightness temperatures include 19.3 GHz vertical and horizontal, 22.2 GHz vertical, 37.0 GHz vertical and horizontal, 85.5 GHz vertical and horizontal (on SSM/I), and 91.7 GHz vertical and horizontal (on SSMIS). Data at 85.5 GHz and 91.7 GHz are gridded at a resolution of 12.5 km, with all other frequencies at a resolution of 25 km. Orbital data for each 24-hour period are mapped to respective grid cells using a simple sum-and-average method, also known as the drop-in-the-bucket method. Data coverage began on 09 July 1987 and is ongoing through the most current processing, with updated data processed several times annually.

Tags: earth-science, infrared-wavelengths, spectral-engineering
Organization: National Aeronautics and Space Administration
Supporting Information for Global Navigation Satellite System (GNSS) Data and Products from NASA CDDIS

This dataset consists of supporting information for use of ground-based Global Navigation Satellite System (GNSS) data and products from the NASA Crustal Dynamics Data Information System (CDDIS). GNSS provide autonomous geo-spatial positioning with global coverage. GNSS data sets from ground receivers at the CDDIS consist primarily of the data from the U.S. Global Positioning System (GPS) and the Russian GLObal NAvigation Satellite System (GLONASS). Since 2011, the CDDIS GNSS archive includes data from other GNSS (Europe’s Galileo, China’s Beidou, Japan’s Quasi-Zenith Satellite System/QZSS, the Indian Regional Navigation Satellite System/IRNSS, and worldwide Satellite Based Augmentation Systems/SBASs), which are similar to the U.S. GPS in terms of the satellite constellation, orbits, and signal structure. More information about these data and products are available on the CDDIS website at https://cddis.nasa.gov/Data_and_Derived_Products/GNSS/GNSS_data_and_product_archive.html.

Tags: earth-science, geodetics, gravity-gravitational-field, solid-earth, tectonics
Organization: National Aeronautics and Space Administration
Plug Load Data

We provide MATLAB binary files (.mat) and comma separated values files of data collected from a pilot study of a plug load management system that allows for the metering and control of individual electrical plug loads. The study included 15 power strips, each containing 4 channels (receptacles), which wirelessly transmitted power consumption data approximately once per second to 3 bridges. The bridges were connected to a building local area network which relayed data to a cloud-based service. Data were archived once per minute with the minimum, mean, and maximum power draw over each one minute interval recorded. The uncontrolled portion of the testing spanned approximately five weeks and established a baseline energy consumption. The controlled portion of the testing employed schedule-based rules for turning off selected loads during non-business hours; it also modified the energy saver policies for certain devices.

Three folders are provided: “matFilesAllChOneDate” provides a MAT-file for each date, each file has all channels; “matFilesOneChAllDates” provides a MAT-file for each channel, each file has all dates; “csvFiles” provides comma separated values files for each date (note that because of data export size limitations, there are 10 csv files for each date). Each folder has the same data; there is no practical difference in content, only the way in which it is organized.

Tags: ames, dashlink, nasa
Organization: National Aeronautics and Space Administration
AfriSAR LVIS L1A Geotagged Images V001

This data set contains geotagged images collected over Gabon, Africa. The images were taken by the NASA Digital Mapping Camera paired with the Land, Vegetation, and Ice Sensor (LVIS), an airborne lidar scanning laser altimeter. The data were collected as part of a NASA campaign, in collaboration with the European Space Agency (ESA) mission AfriSAR.

Tags: earth-science, spectral-engineering, visible-wavelengths
Organization: National Aeronautics and Space Administration
Combined HSRL and Optical Autocovarience Wind Lidar (HOAWL) Demonstration Project

&lt;p&gt;
	Demonstrate 2&amp;beta; + 2&amp;alpha; + 2&amp;delta; High Spectral Resolution Lidar (HSRL) and Doppler wind lidar measurements simultaneously at 355nm and 532nm using a single multiwavelength interferometric receiver.&lt;br /&gt;
	&amp;nbsp;Demonstrate system components:&lt;br /&gt;
	High efficiency multi-wavelength optical autocovariance interferometer and integrated 2&amp;beta; + 2&amp;alpha; + 2&amp;delta; receiver&lt;br /&gt;
	HOAWL calibration and retrieval algorithms&lt;br /&gt;
	Validated radiometric and integrated HOAWL receiver performance models&lt;br /&gt;
	&lt;br /&gt;
	&amp;nbsp;&lt;/p&gt;

Tags: active, nasa-headquarters, project
Organization: National Aeronautics and Space Administration
Tackling Verification and Validation for Prognostics

Verification and validation (V&V) has been identified as a critical phase in fielding systems with Integrated Systems Health Management (ISHM) solutions to ensure that the results produced are robust, reliable, and can confidently inform about vehicle and system health status and to support operational and maintenance decisions. Prognostics is a key constituent within ISHM. It faces unique challenges for V&V since it informs about the future behavior of a component or subsystem. In this paper, we present a detailed review of identified barriers and solutions to prognostics V&V, and a novel methodological way for the organization and application of this knowledge. We discuss these issues within the context of a prognostics application for the ground support equipment of space vehicle propellant loading, and identify the significant barriers and adopted solution for this application.

Tags: ames, dashlink, nasa
Organization: National Aeronautics and Space Administration
Turbulence Models: Data from Other Experiments: 2-D Coanda Airfoil with Tangential Wall Jet

2-D Coanda Airfoil with Tangential Wall Jet. This web page provides data from experiments that may be useful for the validation of turbulence models. This resource is expected to grow gradually over time. All data herein arepublicly available.

Tags: airfoil, coanda, experiment, jets, models, synthetic, tangential, turbulence, validation
Organization: National Aeronautics and Space Administration
SWOT Level 2 Water Mask Pixel Cloud Auxiliary Data Product, Version 2.0

Auxiliary information for pixel cloud product indicating to which water bodies the pixels are assigned in river and lake products. Also includes height-constrained pixel geolocation after reach- or lake-scale averaging. Point cloud over tile (approx 64x64 km2); half swath (left or right side of full swath). Available in netCDF-4 file format.

Tags: earth-science, surface-water, terrestrial-hydrosphere
Organization: National Aeronautics and Space Administration
SMAPVEX19-22 Millbrook Airborne Lidar V001

These lidar measurements were collected in April and August 2022 in the vicinity of Millbrook, NY during the SMAPVEX19-22 campaign. This location was chosen due to its forested land cover, as SMAPVEX19-22 aims to validate satellite derived soil moisture estimates in forested areas. The two acquisition periods were selected to characterize differences during "leaf-off" and "leaf-on" conditions.

Tags: earth-science, lidar, spectral-engineering
Organization: National Aeronautics and Space Administration
Using Markov Models of Fault Growth Physics and Environmental Stresses to Optimize Control Actions

A contrived example of a dice throwing game was considered in order to provide some insight into the general problem developing prognostics-based control routines that utilize uncertain models of component fault dynamics and future environmental stresses to assess and mitigate risk. A generalized Markov modeling representation of fault dynamics was developed for the case that available modeling of fault growth physics and available modeling of future environ- mental stresses are represented by two independent Markov process models. A finite horizon dynamic programming algorithm was given for a Markov decision process representation of the prognostics-based control problem and this algorithm was used to identify an optimal control policy for the dice throwing game that is considered in this paper. The outcomes obtained from simulations of the optimizing control policy were observed to differ only slightly from the outcomes that would have been achievable if all modeling uncertainties were removed from the example dice throwing game.

Tags: ames, dashlink, nasa
Organization: National Aeronautics and Space Administration
Extravehicular Activity Fact Sheet: An EVA Chronology

Walking to Olympus:  An EVA Chronology chronicles the 154 EVAs conducted from March 1965 to April 1997. It is intended to make clear the crucial role played by EVA in the history of spaceflight, as well as to chronicle the large body of EVA lessons learned.

Tags: astronaut, eva, extravehicular-activity, human-spaceflight, international-space-station, iss, mission, space-shuttle, spacewalk
Organization: National Aeronautics and Space Administration
Accelerated Aging System for Prognostics of Power Semiconductor Devices

Prognostics is an engineering discipline that focuses on estimation of the health state of a component and the prediction of its remaining useful life (RUL) before failure. Health state estimation is based on actual conditions and it is fundamental for the prediction of RUL under anticipated future usage. Failure of electronic devices is of great concern as future aircraft will see an increase of electronics to drive and control safety-critical equipment throughout the aircraft. Therefore, development of prognostics solutions for electronics is of key importance. This paper presents an accelerated aging system for gate-controlled power transistors. This system allows for the understanding of the effects of failure mechanisms, and the identification of leading indicators of failure which are essential in the development of physics-based degradation models and RUL prediction. In particular, this system isolates electrical overstress from thermal overstress. Also, this system allows for a precise control of internal temperatures, enabling the exploration of intrinsic failure mechanisms not related to the device packaging. By controlling the temperature within safe operation levels of the device, accelerated aging is induced by electrical overstress only, avoiding the generation of thermal cycles. The temperature is controlled by active thermal-electric units. Several electrical and thermal signals are measured in-situ and recorded for further analysis in the identification of leading indicators of failures. This system, therefore, provides a unique capability in the exploration of different failure mechanisms and the identification of precursors of failure that can be used to provide a health management solution for electronic devices.

Tags: ames, dashlink, nasa
Organization: National Aeronautics and Space Administration
OCO-3 Instrument Attitude and Ephemeris Data for One Specific Solar Day, Forward Processing V11 (OCO3_L1aAE) at GES DISC

Version 11 is the current version of the data set. Older versions will no longer be available and are superseded by Version 11.

The Orbiting Carbon Observatory is the first NASA mission designed to collect space-based measurements of atmospheric carbon dioxide with the precision, resolution, and coverage needed to characterize the processes controlling its buildup in the atmosphere. The OCO-3 project uses the LEOStar-2 spacecraft that carries a single instrument. It incorporates three high-resolution spectrometers that make coincident measurements of reflected sunlight in the near-infrared CO2 near 1.61 and 2.06 micrometers and in molecular oxygen (O2) A-Band at 0.76 micrometers. The three spectrometers have different characteristics and are calibrated independently. Their raw data numbers (DN) are delivered correlated in time to the Level 1B process as Level 1A products. Each band has 1016 spectral elements, although some are masked out in the L2 retrieval.This product is the input to the Level 1B process. It is depacketized raw data formatted into a standard granularity with calibrated engineering data (for both science and calibration observations), in the Sample Mode of operation.This is the retrospective processing where the calibration data is estimated from the full timeseries of data (before, during, and after the measurements), and is expected to be of slightly higher quality.

Tags: atmosphere, atmospheric-chemistry, earth-science, infrared-wavelengths, spectral-engineering
Organization: National Aeronautics and Space Administration
Tracking Logistical Constraints Across Missions and Organizations: A Multipurpose Information Infrastructure

execute plans and schedules that achieve stated goals while simultaneously minimizing the cost of logistics management and maximizing resource productivity. This goal is a challenge in space flight environments where just-in-time logistics management can’t be supported and large scale planning and scheduling requires collaborations and negotiations that aross many divisions and departments. Although there have been many systems proposed and/or developed that address one or more of these concerns, a key element missing in these systems is the
tight coupling that is necessary between maintenance, logistics, and operations. This close relationship is particularly important in space operations where changes to scheduled missions and/or the logistics chain can greatly impact overall operations. Based on previous work on combined maintenance and operations planning/scheduling for Marine
Aviation, we propose a software-based infrastructure that coordinates planning, scheduling, and execution across multiple departments and disciplines.

Tags: ames, dashlink, nasa
Organization: National Aeronautics and Space Administration