ChemSpider is a free chemical structure database providing fast text and structure search access to over 26 million structures from hundreds of data sources. There is an iPhone app also available at http://itunes.apple.com/us/app/chemspider/id458878661?mt=8
Open-access collection of crystal structures of organic, inorganic, metal-organic compounds and minerals, excluding biopolymers.
Including data and software from CrystalEye, developed by Nick Day at the department of Chemistry, the University of Cambridge under supervision of Peter Murray-Rust.
The GSA Data Repository was established in 1974. It is an open file in which authors of articles in our journals can place information that supplements and expands on their article. These supplements will not appear in print but may be obtained from GSA.
One Stop Source for environmental and natural resources data, at anytime, from anywhere, to anyone. The Gateway allows you to choose your area of interest, browse and select data from our catalog, customize the format, and have it downloaded or shipped on CD or DVD.
GCMD holds more than 28,000 Earth science data set and service descriptions, which cover subject areas within the Earth and environmental sciences. The project mission is to assist researchers, policy makers, and the public in the discovery of and access to data, related services, and ancillary information (which includes descriptions of instruments and platforms) relevant to global change and Earth science research.
NODC maintains and updates a national ocean archive with environmental data acquired from domestic and foreign activities and produces products and research from these data which help monitor global environmental changes. These data include physical, biological and chemical measurements derived from in situ oceanographic observations, satellite remote sensing of the oceans, and ocean model simulations.
The National Hydrography Dataset (NHD) is the surface water component of The National Map. The NHD is a digital vector dataset used by geographic information systems (GIS). It contains features such as lakes, ponds, streams, rivers, canals, dams and streamgages. These data are designed to be used in general mapping and in the analysis of surface-water systems.
Databases of diatomic, triatomic, and hydrocarbon molecules were originally published as spectral tables in the Journal of Physical and Chemical Reference Data. Each of the databases covers primarily the microwave region with some data available for the radio frequency region.
Provides the energies for K transitions connecting the K shell (n = 1) to the shells with principal quantum numbers n = 2 to 4 and L transitions connecting the L1, L2, and L3 shells (n = 2) to the shells with principal quantum numbers n = 3 and 4.
Calculate photon cross sections for scattering, photoelectric absorption and pair production, as well as total attenuation coefficients, for any element, compound or mixture (Z ≤ 100), at energies from 1 keV to 100 GeV.
NASA's permanent archive for space science mission data. Space science means astronomy & astrophysics, solar and space plasma physics, and lunar and planetary science. Archives > 130 TB of data, 7 TB of the most important data are available for digital download.
NASA funded project to support and provide to the astronomical community a variety of astronomical data archives, with the primary focus on scientifically related data sets in the optical, ultraviolet, and near-infrared parts of the spectrum. MAST is located at the Space Telescope Science Institute (STScI).
(operated by CDS)
Interactive software sky atlas allows the user to visualize digitized astronomical images, superimpose entries from astronomical catalogues or databases, and access data from object archives.
(operated by CDS and ESA-ESRIN)
Access to 10934 published astronomical catalogues and data tables available online. Optimized to query some very large catalogues such as UCAC2, USNO-B1, and 2MASS's last release.
Built around a master list of extragalactic objects for which cross-identifications of names have been established, accurate positions and redshifts entered to the extent possible, and some basic data collected. Bibliographic references relevant to individual objects have been compiled, and abstracts of extragalactic interest are kept on line. Detailed and referenced photometry, position, and redshift data, have been taken from large compilations and from the literature. NED also includes images from 2MASS, from the literature, and from the Digitized Sky Survey. NED's data and references are being continually updated, with revised versions being put on-line every 4-6 months.