{"id":2139,"date":"2026-10-13T14:27:13","date_gmt":"2026-10-13T12:27:13","guid":{"rendered":"https:\/\/sites-lira.obspm.fr\/data-services\/?page_id=2139"},"modified":"2026-10-13T14:27:15","modified_gmt":"2026-10-13T12:27:15","slug":"relab-spectral-library","status":"publish","type":"page","link":"https:\/\/sites-lira.obspm.fr\/data-services\/relab-spectral-library\/","title":{"rendered":"RELAB spectral library"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">The RELAB spectral library is an archive of laboratory measurements of minerals, rocks, meteorites, and extraterrestrial samples in the visible, near-IR, and mid-IR ranges. The data consists in spectra acquired or curated at the RELAB facility at Brown University, Providence (DOI: <a href=\"https:\/\/doi.org\/10.17189\/1519032\">https:\/\/doi.org\/10.17189\/1519032<\/a>; Pieters et al 1983, JGR 88, 9534\u20139544).<br>The RELAB spectral library is distributed in several places:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Brown University makes an annual release of their archive with documentation at <a href=\"https:\/\/sites.brown.edu\/relab\/\">https:\/\/sites.brown.edu\/relab\/<\/a><\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li>the PDS Geosciences node distributes a subset of this collection as a PDS4 dataset at <a href=\"https:\/\/pds-geosciences.wustl.edu\/speclib\/urn-nasa-pds-relab\/\">https:\/\/pds-geosciences.wustl.edu\/speclib\/urn-nasa-pds-relab\/<\/a><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">A web-based interface providing access to this and other collections is also available at the PDS Geosciences node: <a href=\"https:\/\/pds-speclib.rsl.wustl.edu\/search.aspx\">https:\/\/pds-speclib.rsl.wustl.edu\/search.aspx<\/a><br>Most spectra are measured in reflectance, only ~&nbsp;200 are measured in transmittance. The scale is Reflectance factor, or REFF [= I\/F \/ cos(i) ].<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Virtual Observatory service<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">A Virtual Observatory (VO) data service has been setup to provide easier access to the RELAB spectral library content and to facilitate comparisons with observational data. In particular, this service can be queried through the web from the command line.<br>The VO service is based on the RELAB archive at Brown University. It is presented as a table with descriptive parameters for each spectrum, extracted from the RELAB catalogues. Individual spectra have been reformatted as VOTable (xml format).<br>No attempt was made to improve the data content itself. Only the metadata formatting has been adapted to make it compliant with the standard in use, with corrections of a few obvious typos.<br>This data service is responsive to the EPN-TAP data access protocol, and can be queried from the VESPA portal of Solar System data: <a href=\"http:\/\/vespa.obspm.fr\/\">http:\/\/vespa.obspm.fr\/<\/a> and other TAP clients.\u2028 See the <a href=\"https:\/\/vespa.obspm.fr\/planetary\/data\/display\/?&amp;f-url_op=http:\/\/voparis-tap-planeto.obspm.fr\/tap&amp;f-schema_op=spectro_tno&amp;f-text_query=(1%20=%20ivo_hashlist_has(lower(%22target_name%22),lower(%27mars%27)))&amp;services=form_registered_services&amp;query_source=form&amp;service_id=ivo:\/\/padc.obspm.planeto\/relab\/q\/epn_core\">complete data service<\/a> in VESPA (the schema name is relab).<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A tutorial on spectral studies in the Planetary Science VO context is available here:<br><a href=\"http:\/\/voparis-europlanet.obspm.fr\/utilities\/Tuto_Spectro_VESPA.pdf\">http:\/\/voparis-europlanet.obspm.fr\/utilities\/Tuto_Spectro_VESPA.pdf<\/a><br>In particular with the CASSIS tool:<br><a href=\"http:\/\/voparis-europlanet.obspm.fr\/utilities\/Tuto_CASSIS_VESPA.pdf\">http:\/\/voparis-europlanet.obspm.fr\/utilities\/Tuto_CASSIS_VESPA.pdf<\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>In short<\/strong>: you first identify data of interest from a search interface, then send selected results in a visualization and analysis tool. Adapted VO tools include CASSIS, TOPCAT, and SPLAT-VO.<br><\/p>\n\n\n\n<div class=\"wp-block-group\"><div class=\"wp-block-group__inner-container is-layout-constrained wp-block-group-is-layout-constrained\">\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"664\" src=\"https:\/\/sites-lira.obspm.fr\/data-services\/files\/2026\/10\/Vesta-vs-SNC-1024x664.png\" alt=\"\" class=\"wp-image-2158\" srcset=\"https:\/\/sites-lira.obspm.fr\/data-services\/files\/2026\/10\/Vesta-vs-SNC-1024x664.png 1024w, https:\/\/sites-lira.obspm.fr\/data-services\/files\/2026\/10\/Vesta-vs-SNC-300x195.png 300w, https:\/\/sites-lira.obspm.fr\/data-services\/files\/2026\/10\/Vesta-vs-SNC-768x498.png 768w, https:\/\/sites-lira.obspm.fr\/data-services\/files\/2026\/10\/Vesta-vs-SNC-1536x997.png 1536w, https:\/\/sites-lira.obspm.fr\/data-services\/files\/2026\/10\/Vesta-vs-SNC-2048x1329.png 2048w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\"><em><strong>Fig. 1:<\/strong> SNC meteorites from RELAB compared with spectra of 4 Vesta from the M4ast data service, in SPLAT-VO<\/em><\/figcaption><\/figure>\n<\/div><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">Looking for spectra<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Spectra of interest can be found by filtering the table parameters. Such queries can be performed from the VESPA portal or any TAP interface (TAPhandle, TOPCAT, CASSIS, astropy python library, etc). \u2028<br>Query results are tables, with a line describing each matching spectrum. The column access_url provides a link to the VOtable version of the spectrum. The main RELAB references are maintained for regular users:\u2028<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>sample_ID<\/strong> \u2013 original SampleID from the catalogues (in upper case). The format is AA-AAA-DDD plus optionally -AAA (where D = digit, A = character). A few identified typos in the catalogue are fixed (replaced by the value in the file).<br><strong>granule_uid<\/strong> = obs_id \u2013 original SpectrumID (in upper case), similar to the spectrum file name. This is a unique ID in the table (duplicate spectra in the archive are removed).<br><strong>target_name<\/strong> \u2013 original SampleName as given by the spectrum producer (with original case). A few obvious parsing errors in the catalogue are fixed but this is otherwise unchanged. In many cases this is a description of the sample rather than a short name. It may include a specific code related to the provider&#8217;s collection.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Other basic search parameters are:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>sample_classification<\/strong> \u2013 complete original classification scheme merging the 6 description keywords in the sample catalogue. It is&nbsp;provided as a list of values in lower cases, separated by the # character. This formatting is more robust than a series of hierarchical keywords and makes it easier to issue global queries. The original keywords do not always contain the exact species name.\u2028<br><strong>granule_gid<\/strong> \u2013 provides higher level grouping of the spectra, derived from the 2 upper-level description keywords in the sample catalogue (Source and GeneralType1, in lower case). In some cases this has been made more explicit: &#8220;lunar sample&#8221;, &#8220;asteroid sample&#8221;, and &#8220;meteorite&#8221; are tagged explicitely. Other values start with &#8220;earth&#8221; or &#8220;synthetic&#8221; + GeneralType1 appended. \u2028<br><strong>sample_desc<\/strong> \u2013 free format string merging the parameters SampleName and Text from the sample catalogue. This is intended as an information string rather than a search parameter, but it may contain the species name when not included in sample_classification, or a mention of sample preparation.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Other parameters are searchable, in particular: <strong>geometry_type<\/strong> (can be &#8216;bidirectional&#8217;, &#8216;biconical&#8217;, &#8216;bidirectional#biconical&#8217;, &#8216;directional-hemispherical&#8217; or &#8216;transmittance&#8217;), <strong>illumination angles<\/strong> (incidence, emergence, phase), <strong>sample_origin<\/strong> and sample_texture, <strong>producer_name<\/strong> and producer_institute.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The parameter <strong>external_link<\/strong> points to the spectrum page in the PDS Geosciences node interface. This page contains links to ancillary files when available &#8211; these provide extra descriptive information such as chemical analysis, sample photographs, bibliographic references, etc which are not currently included in the EPN-TAP table. Notice however that many spectra from the RELAB archive have not been included in the PDS dataset and do not have a dedicated page. Similarly, <strong>sample_analysis_url <\/strong>points to the chemical analysis in the PDS Geosciences site.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"598\" src=\"https:\/\/sites-lira.obspm.fr\/data-services\/files\/2026\/09\/Portail-vs-RELAB-1024x598.png\" alt=\"\" class=\"wp-image-2151\" srcset=\"https:\/\/sites-lira.obspm.fr\/data-services\/files\/2026\/09\/Portail-vs-RELAB-1024x598.png 1024w, https:\/\/sites-lira.obspm.fr\/data-services\/files\/2026\/09\/Portail-vs-RELAB-300x175.png 300w, https:\/\/sites-lira.obspm.fr\/data-services\/files\/2026\/09\/Portail-vs-RELAB-768x448.png 768w, https:\/\/sites-lira.obspm.fr\/data-services\/files\/2026\/09\/Portail-vs-RELAB-1536x897.png 1536w, https:\/\/sites-lira.obspm.fr\/data-services\/files\/2026\/09\/Portail-vs-RELAB.png 1636w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\"><em><strong>Fig.2:<\/strong> the RELAB spectral library in the VESPA portal (result from a global query)<\/em><\/figcaption><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">Standard query to find selected species<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The VESPA portal allows the user to issue requests from a graphical interface. It will query all available data services that use the EPN-TAP standard.<br>\u2028TAP queries can also be issued from lower-level interfaces using the ADQL language. Such detailed queries can be performed in the ADQL Query mode of the VESPA portal, as well as from TOPCAT or TAPhandle. Beware that spectral range has to be queried in Hz (no conversion performed in this mode).<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>The initial clause of the ADQL query is always\u2028<br><em>SELECT * from relab.epn_core<\/em><br>By itself, it returns the whole content of the collection.<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Simple filters on the search parameters can be attached to it, e.g.:\u2028<br><em>WHERE sample_classification LIKE &#8216;%olivine%&#8217;<\/em><br>\u2028or<br>\u2028<em>WHERE sample_classification LIKE &#8216;%mixture%&#8217;\u2028<\/em><br>However due to the original description of samples in the RELAB spectral library, not all spectra of interest will be retrieved this way.<br><\/li>\n\n\n\n<li>Possible refinements include:\u2028<br><em>WHERE sample_classification LIKE &#8216;%neso%&#8217;<\/em><br>\u2028(which may include fayalite or forsterite)\u2028<br><em>WHERE lower(sample_desc) LIKE &#8216;%olivine%&#8217;\u2028<\/em><br>(although this parameter is mostly informative and not intended as a search key)<br><\/li>\n\n\n\n<li>Queries for groups of materials can use the granule_gid parameter, which provides a rough grouping of materials:\u2028<br>earth | synthetic | lunar sample | asteroid sample | meteorite\u2028<br>(for earth) | amp | ash | glass | mineral | rock, etc\u2026<br>\u2028(for synthetic) biological | coating |&nbsp;mixture, etc\u2026<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Some special cases<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">&#8211; <strong>Meteorites spectra<\/strong> are identified as such in the table. They can be found with the request\u2028<br><em>WHERE granule_gid = &#8216;meteorite&#8217;<\/em><br>which provides 7209 matches. <br>This includes some minerals extracted from meteorites (mainly troilite).<br>Beware that 66 spectra which do not have a description in the catalogues include lunar samples and meteorites.<br>The target_name parameter usually provides the meteorite name, sometimes associated with size separate or indication of irradiation dose. The meteorite name is often included in sample_desc, the type is usually specified in sample_classification.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">&#8211; <strong>Martian and lunar meteorite<\/strong> spectra are identified in the original catalogue so that they are all identifiable with a request, e.g.:\u2028<br><em>WHERE sample_classification LIKE &#8216;%mars-met%&#8217;\u2028<\/em><br>which provides 335 matches\u2028<br>In addition, the meteorite name is included in the target_name parameter in almost all cases.<br><em>\u2028WHERE lower(target_name) LIKE &#8216;%nakhla%&#8217;\u2028<\/em><br>returns 13 spectra of Nakhla samples<br>\u2028Beware that the request<br><em>\u2028WHERE lower(sample_desc) LIKE &#8216;%mars%&#8217;\u2028<\/em><br>mostly returns synthetic Martian analogues\/simulants, rather than meteorites.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">&#8211; <strong>Lunar samples<\/strong> are all identifiable with the request\u2028<br><em>WHERE granule_gid = &#8216;lunar sample&#8217;\u2028<\/em><br>which provide 2682 spectra identified in the dataset<br>\u2028These include rocks, soils, and some extracted minerals.\u2028<br>The lunar sample ID is often included in the target_name or sample_desc parameters, not in sample_classification.<br>Beware that 66 spectra which do not have a description in the catalogues include lunar samples and meteorites.<br>Ex: the ADQL query to select spectra in Fig. 3 is<br><em>\u2028SELECT * FROM relab.epn_core WHERE granule_gid = &#8216;lunar sample&#8217; and sample_origin LIKE &#8216;%Apollo 17%&#8217; and spectral_range_min &lt; 23000000000000<\/em><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">&#8211; <strong>Lunar simulants<\/strong> are not directly identified in the RELAB catalogues but can be found with:<br><em>WHERE (sample_classification LIKE &#8216;%simulant%&#8217; or target_name LIKE &#8216;%simulant%&#8217;) and (target_name LIKE &#8216;%lunar%&#8217; or sample_classification LIKE &#8216;%lunar%&#8217;)<\/em><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">&#8211; <strong>Mixtures of minerals<\/strong> may be difficult to retrieve\u2028<br>A basic request is\u2028<br><em>WHERE sample_desc LIKE &#8216;%mixture%&#8217; or sample_classification LIKE &#8216;%mixture%&#8217;\u2028<\/em><br>which returns 3047results<br>\u2028However, other mixtures may be present in the archive. An ad hoc description scheme is often used for individual measurement programmes.\u2028<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"737\" src=\"https:\/\/sites-lira.obspm.fr\/data-services\/files\/2026\/10\/Mars_met_RELAB-1024x737.png\" alt=\"\" class=\"wp-image-2159\" srcset=\"https:\/\/sites-lira.obspm.fr\/data-services\/files\/2026\/10\/Mars_met_RELAB-1024x737.png 1024w, https:\/\/sites-lira.obspm.fr\/data-services\/files\/2026\/10\/Mars_met_RELAB-300x216.png 300w, https:\/\/sites-lira.obspm.fr\/data-services\/files\/2026\/10\/Mars_met_RELAB-768x553.png 768w, https:\/\/sites-lira.obspm.fr\/data-services\/files\/2026\/10\/Mars_met_RELAB.png 1276w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\"><em><strong>Fig. 3:<\/strong>\u00a0 Martian meteorites spectra encompassing the mid-IR range, displayed in SPLAT-VO<\/em><\/figcaption><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">Extra information<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u2022&nbsp;Chemical analyses, sample photographs and bibliographic references are available on the PDS page when present. This page is reachable under <strong>external_link<\/strong> for interactive use. The chemical analysis file is linked under <strong>sample_analysis_url<\/strong>.<br>\u2022 Spectral range conversion from Hz to \u00b5m goes like this:\u2028<br>\u2013 min_wvl = 2.99792458E14 \/ max_freq\u2028<br>\u2013 max_wvl = 2.99792458E14 \/ min_freq<br>\u2022&nbsp;Spectral_resolution_min \/max provides the resolving power at both range extremities. This is only indicative, and values may be inaccurate for composite spectra.<br>\u2022&nbsp;Bulk material is indicated as grain_size_min = grain_size_max = 0. \u2028<br>Particles larger than a minimum size are described with grain_size_max = 1000 to 10000 \u00b5m, or occasionally grain_size_max = 0<br>\u2022&nbsp;Azimuth is always zero; incidence and emergence can be negative; opposite signs correspond to directions opposite to the normal, so that the phase angle always equals incidence + emergence.&nbsp;Incidence and emergence angles are retrieved from the spectral catalogue, and left empty when they are not provided. Viewing angles set to 0. are actually 0\u00b0 (not unknown).<br>\u2022 The acquisition and release date are taken from the spectra catalogue and may also differ from the value in the spectral files.<br>\u2022&nbsp;The data provider indicated in the table is the PI from the catalogue.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Sending spectra to VO tools<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Several VO tools open the VOtable versions of the spectra for plotting and analysis. They also accept the data sent through the IVOA SAMP protocol, in particular from the VESPA portal:<br>\u2028\u2022 CASSIS accepts files passed as spectra only<br>\u2028\u2022 TOPCAT accepts files passed as tables only<br>\u2022&nbsp;SPLAT-VO accepts files passed either as spectra or tables\u2028<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Both CASSIS and SPLAT-VO check the spectral quantity of input spectra. A warning is issued in CASSIS when overplotting different quantities, but this does not prevent from plotting the spectra (manual scaling is required in this case).<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">How the service was built<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The current service is derived from the RELAB archive at Brown University (2025 version). Although remarkably consistent over a 40-year period, the archive fatally suffers from the absence of a community standard, metadata enlargement as new instruments were used, evolutions of data handling software, and apparently digitization of printed material at some point. <br>The archive consists in several catalogues (spectra, samples, instruments, PI\u2026&nbsp;) and two series of spectral files: a .txt version with a short header providing only sample ID and spectrum ID, and a .asc version with a longer tailer providing more information. The catalogues do not always include all this information but they integrate other sources.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The main table of the service was written by merging the RELAB catalogues, and completed to some extent with extra information available in the spectral files. The current restoration is independent from that in the PDS Geosciences service, although this was of course used as a reference point when solving issues.<br>\u2013 A global consistency check is performed on the spectra catalogue and minor corrections are made. All catalogues are joined in a single table describing one spectrum per row. \u2028<br>\u2013 The baseline is to maintain the indexing and description of samples available in the original archive. This may lead to some inconsistencies and occasional difficulties to locate the spectra.<br>\u2013 The service table describes spectra in compliance with the EPN-TAP protocol, which implies changes in keyword names and units (e. g., particle size is always in \u00b5m, spectral range in Hz).<br>\u2013 All spectra are provided as VOTable \u2014&nbsp;xml files which are handled by VO tools for display and analysis. Although the VOTable header here is minimal, it is more regular that the tailer of the original ascii files at RELAB and can be parsed easily. Occasional encoding difficulties are fixed during conversion.\u2028<br>\u2013 Thumbnails have been produced to provide a quick visual diagnostic in the VESPA portal and other interfaces.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><br>Only some obvious formatting issues and inconsistencies are fixed during ingestion both in the table and spectra, including:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>sampleID was corrected whenever the value in the spectra catalogue didn&#8217;t match any entry in the sample catalogue. In most cases this results from incomplete string parsing, and restoring the value from the original file fixed the issue. The file value was not restored systematically however, as it sometimes resulted in further inconsistencies.<\/li>\n\n\n\n<li>spectrumID was corrected when the value provided in the spectra catalogue didn&#8217;t fit the description, and when a correct match was found. A few examples were identified from inconsistencies in the metadata, but others may remain unspotted.<\/li>\n\n\n\n<li>sampleName, if still empty after the previous corrections, is completed from the description provided in the spectrum file. This may not be always relevant.<\/li>\n\n\n\n<li>For a small fraction of the archive (66 spectra) the sample description couldn&#8217;t not be safely restored from the available catalogues. This includes lunar samples and meteorites. In some cases they can be identified by target_name.<\/li>\n\n\n\n<li>Occasional duplicates are removed, as well as catalogue entries with no corresponding file and a few outliers (external data converted to the RELAB format).<\/li>\n\n\n\n<li>Illumination angles in the table are those from the spectra catalogue, which support searches for phase angle and photometric function.<br>Illumination angles are provided both in the files and in the spectra catalogue, but their values differ significantly. The catalogue values appear to be restored from more documented sources (perhaps experimental notebooks, sometimes free comment in the file tailer) even when the file keywords indicate a default configuration. They include the phase angle (consistently = i-e), and the emergence angle is often opposite to the value in the file, suggesting that it has been corrected when necessary. Altogether, the catalogue values are more informative and more consistent than the file values, in particular when considering experimental runs exploring phase function of given samples. Illumination is provided in the catalogue for only ~&nbsp;half the dataset, but the all missing values correspond to file values of (i,e) = (0,0), (30,0), (30,-30) \u2014&nbsp;which are either a default entry or a default measurement configuration.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">The major differences with the Spectral library service at the PDS Geosciences node include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>the PDS service provides access to several other databases and is mainly an interactive tool. In contrast, the EPN-TAP service is easily scriptable and can be cross-searched with similar archives which comply to the EPN-TAP standard.<\/li>\n\n\n\n<li>the EPN-TAP service is an agnostic port of the RELAB catalogues. Spectra with inconsistent description are removed only when they result in malfunctions, typically with duplicate spectrumID or when the file is absent from the archive. A total of 33795 spectra are recovered from the RELAB archive.<\/li>\n\n\n\n<li>the RELAB section of the PDS service is instead limited to 23,598 spectra, suggesting filtering on quality criteria. In particular, poorly described spectra are removed and composite spectra from various instruments do not seem included in the PDS service.<\/li>\n\n\n\n<li>the PDS service lists the illumination angles provided via the Source and Detection angles of the data files, plus the reconstructed phase angle. The EPN-TAP service maintains the values (i,e,phi) listed in the spectra catalogues, which are more consistent. Missing values always correspond to default configurations, either (i,e) = (30,0) or (30,-30).<\/li>\n\n\n\n<li>Additional descriptive files (chemical analysis, sample photographs\u2026) are only accessible via the PDS service currently.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Other major libraries of mineral spectra<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Three other databases will benefit from an EPN-TAP interface and will be available for cross searches from the VESPA portal:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2022 The <strong>SSHADE<\/strong> service (Schmitt et al., EPSC, 2015) [published]: <a href=\"https:\/\/www.sshade.eu\">https:\/\/www.sshade.eu<\/a><br>including in particular the older <strong>GhoSST<\/strong> database (Schmitt et al. 2012, EPSC2012\u2013960): <a href=\"http:\/\/Ghosst.osug.fr\">Ghosst.osug.fr<\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2022&nbsp;<strong>Berlin Reflectance Spectral Library<\/strong> (Henckel et al, EPSC 2017) [draft ready]<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2022 The <strong>Berlin emissivity database<\/strong> (BED) (Maturilli et al., 2008, PSS 56, 420\u2013425) [draft ready]<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2022&nbsp;The EPN-TAP RELAB service replaces a previous library in support to the CRISM experiment on MRO, which was affected by formatting issues. Most of its content is included in the larger RELAB archive.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Other databases listed below are usual references, but are not interoperable in a VO context:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2022&nbsp;USGS <strong>splib07a<\/strong>:<br><a href=\"https:\/\/crustal.usgs.gov\/speclab\/QueryAll07a.php\">https:\/\/crustal.usgs.gov\/speclab\/QueryAll07a.php<\/a><br>~2500 spectra with convolved and over-sampled versions, software, etc (Kokaly et al. 2017, USGS TR 1035)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2022 JPL <strong>ASTER<\/strong><br><a href=\"https:\/\/speclib.jpl.nasa.gov\/\">https:\/\/speclib.jpl.nasa.gov\/<\/a><br>Includes ASTER 2.0 (Baldridge et al 2009, Remote Sensing of Environment 113, 771\u2013715)<br>+ Johns Hopkins University Spectral Library (spectra from Salisbury et al. 1991, Infrared (2.1-25 \u03bcm) spectra of minerals)<br>+ JPL Spectral Library (spectra from Grove et al 1992, TR JPL-Publ-92-2)<br>total of ~&nbsp;2500 spectra, including meteorites, lunar samples, water<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u2022 HOSERLab \/ Planetary Spectrophotometer Facility<\/strong>&nbsp; Winnipeg University<br>Large archive of minerals in form of xls files. Includes data from other facilities, in particular RELAB (Cloutis et al 2006, LPSC abs2121; Cloutis et al 2015, LPSC abs1187))<br>Access to data files: <a href=\"http:\/\/psf.uwinnipeg.ca\/Sample_Database\/\">http:\/\/psf.uwinnipeg.ca\/Sample_Database\/<\/a><br>Documentation: <a href=\"http:\/\/psf.uwinnipeg.ca\/Samples_Directory\/\">http:\/\/psf.uwinnipeg.ca\/Samples_Directory\/<\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2022&nbsp;<strong>ASU spectral library<\/strong> (emission)<br><a href=\"http:\/\/speclib.asu.edu\/\">http:\/\/speclib.asu.edu\/<\/a><br>(Christensen et al 2000, JGR 105, 9735\u20139740)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Contact the helpdesk for comments: <a href=\"mailto:support.vespa@obspm.fr\">support.vespa@obspm.fr<\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">_____________________<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This data service is provided in the framework of the VESPA activity in Europlanet 2020 by Paris Astronomical Data Centre (PADC).<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The Europlanet 2020 Research Infrastructure project has received funding from the European Union\u2019s Horizon 2020 research and innovation programme under grant agreement No 654208. Additional funding was provided in France by the Action Sp\u00e9cifique Observatoire Virtuel and Programme National de Plan\u00e9tologie \/ INSU.<img decoding=\"async\" src=\"https:\/\/sites-lira.obspm.fr\/data-services\/files\/2017\/08\/logo_europlanet_0-300x136.jpg\" alt=\"\" style=\"width: 150px\"> <img decoding=\"async\" src=\"https:\/\/sites-lira.obspm.fr\/data-services\/files\/2017\/08\/PADCpt-300x175.png\" alt=\"\" style=\"width: 80px\">&nbsp; &nbsp; <img decoding=\"async\" src=\"https:\/\/sites-lira.obspm.fr\/data-services\/files\/2017\/08\/VES.png\" alt=\"100\" style=\"width: 50px\"><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>The RELAB spectral library is an archive of laboratory measurements of minerals, rocks, meteorites, and extraterrestrial samples in the visible, near-IR, and mid-IR ranges. The data consists in spectra acquired or curated at the RELAB facility at Brown University, Providence &hellip; <a href=\"https:\/\/sites-lira.obspm.fr\/data-services\/relab-spectral-library\/\">Continue reading <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":31,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-2139","page","type-page","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>RELAB spectral library - Data services<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/sites-lira.obspm.fr\/data-services\/relab-spectral-library\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"RELAB spectral library - Data services\" \/>\n<meta property=\"og:description\" content=\"The RELAB spectral library is an archive of laboratory measurements of minerals, rocks, meteorites, and extraterrestrial samples in the visible, near-IR, and mid-IR ranges. 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