NOAA/BAA grant for OPeNDAP-Unidata Linked Servers (OPULS)

فهرست عناوین اصلی در این پاورپوینت

فهرست عناوین اصلی در این پاورپوینت

● OPeNDAP-Unidata
Development of DAP4
(a Data Access Protocol)
● Some of DAP Users’
Distinguishing Needs
● Present State of DAP
● Branching: Hyrax & THREDDS
● NOAA/BAA grant for
OPeNDAP-Unidata Linked Servers (OPULS)
● OPeNDAP Data-Type Philosophy
(reflected in DAP2 & now DAP4)
● DAP4 Data Model (simplified)
● DAP4 Data Types & Relations
● DAP4 Operations (invoked as query strings)
● OPeNDAP Projection Operators
● Other DAP-Related Serverices
Note: these were not part of the DAP2 specification…
● Other OPULS Accomplishments
● OPULS Process
● Town-Hall Questions
● i thank

نوع زبان: انگلیسی حجم: 3.26 مگا بایت
نوع فایل: اسلاید پاورپوینت تعداد اسلایدها: 16 صفحه
سطح مطلب: نامشخص پسوند فایل: ppt
گروه موضوعی: زمان استخراج مطلب: 2019/05/17 03:57:12

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عبارات مهم استفاده شده در این مطلب

عبارات مهم استفاده شده در این مطلب

datum, variable, e.g., server, dap, opendap, type, function, service, …, dap۴, user,

توجه: این مطلب در تاریخ 2019/05/17 03:57:12 به صورت خودکار از فضای وب آشکار توسط موتور جستجوی پاورپوینت جمع آوری شده است و در صورت اعلام عدم رضایت تهیه کننده ی آن، طبق قوانین سایت از روی وب گاه حذف خواهد شد. این مطلب از وب سایت زیر استخراج شده است و مسئولیت انتشار آن با منبع اصلی است.

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عبارات پرتکرار و مهم در این اسلاید عبارتند از: datum, variable, e.g., server, dap, opendap, type, function, service, …, dap۴, user,

مشاهده محتوای متنیِ این اسلاید ppt

مشاهده محتوای متنیِ این اسلاید ppt

opendap unidata development of dap۴ a data access protocol describing progress and seeking input at the esip summer meeting ۲ ۱۲ by dave fulker opendap president overarching concept of opendap’s data access protocol dap clients get only needed data when they need them accessing data through web services i.e. url ≈ dataset appending query strings to invoke server functions esp. subsetting getting responses of ۲ major types metadata dataset descriptions catalogs textual content values and metadata binary or textual using responses in diverse client contexts e.g. matlab maps dap responses directly to its internal math types dap libraries netcdf e.g. simplify the programming of apps some of dap users’ distinguishing needs data often depict scientific phenomena where geospatial maps are among the useful views but other views are important as well coordinates often are ۲ ۳ ۴ even ۵ dimensional these may include time dependent coordinate proxies users often wish to use data whose source files are in a variety of inconvenient formats with insufficient or obsolete metadata present state of dap the dap۲ specification after nearly ۲ decades has multiple contemporary realizations on servers and clients clients include matlab grads idl idv … python apps that employ the pydap library fortran c c java apps that employ the netcdf library servers include pydap erdap … often with augmented services most widely deployed tds unidata hyrax opendap widely used by data providers and users including cases where dap servers provide translations of inconveniently formatted source files branching hyrax thredds multiple implementations of a protocol often is considered a good thing per ietf e.g. this can be a problem however if the implementations embody excessive redundancy or confuse users our view co existence of tds unidata hyrax opendap reflects some redundancy creates some inconsistencies for users need ۱ achieve conformance ⇒ consistency for users need ۲ more software reuse ⇒ more advancement noaa baa grant for opendap unidata linked servers opuls goal ۱ opendap unidata conformance linkage new data model protocol specs dap۴ with conformance tests extensibility demos modes of asynchronous access to near line data e.g. server side subsetting of data on irregular meshes goal ۲ common software for opendap unidata servers work yet to begin … opendap data type philosophy reflected in dap۲ now dap۴ data model has few data types for simplified programming lowered risk of errors data types are deliberately domain neutral for better trans domain utility programmer uptake but they allow both syntactic semantic structures metadata these types do in fact support domain needs netcdf like can represent functions on ۴ d domains e.g. sequences selections match dbms sensibilities dap۴ data model simplified attributes are like variables but with a semantic purpose making a variable or a group more meaningful. e.g. variables often have an attribute of type string named units. dataset ≈ unique url with no query string a dataset holds a hierarchy of groups each a namespace container for variables dimensions attributes each variable comprises a name unique in the group a type which applies to all values value s organized as dimensioned arrays attributes optional dap۴ data types relations as in c or java e.g. a variable’s type may be structured or atomic integer float byte string … dap variables may be semantically related to one another via two key grouping constructs relations link ۱ d variables as columns in a table sampled functions link coordinate map variables domain to function value variables ranges having common indexes in turn relations can be linked via variables that serve as foreign keys dap۴ operations invoked as query strings ۳ kinds of constraint expressions i.e. query strings yield subsets or invoke server side processing projection returns a subset selection returns a subset function today’s town hall specify included variables by name as well as indices of included array elements limit tuples rows of a relation to those with variable values satisfying a dbms style predicate invoke server functions to calculate a return we intend to target critical needs like netcdf but as a web service users may skip indices limit index ranges reduce dimensionality opendap projection operators other dap related serverices note these were not part of the dap۲ specification … many dap based servers from unidata opendap e.g. accept multiple types of data as inputs offer several views of them over the web native dap web services for dap enabled clients source format lossless netcdf to netcdf or hdf۴ to hdf۴ e.g. alternative web services html browser views xml wcs etc. town hall what other services should be offered other opuls accomplishments irregular mesh subsetting progress with u wa bill howe to be released soon … asynchronous access preliminary trials … cloud based service provision with parallelism modis reprojection related but not opuls funding opuls process transparency public documentation updated weekly just google opuls advisory committee jeff de la beaujardiere james frew mike folk steve hankin eric kihn rich signell welcoming input per this town hall town hall questions what server functions ought to be specified in the dap۴ protocol simple point wise mathematics mathematics on sampled functions truly domain specific functions involving the datum e.g. which other web service protocols should be leveraged by dap servers what are the pertinent use cases to facilitate open search exploiting atom e.g. to facilitate semantic analysis providing rdf output e.g. others i thank you opendap inc http increasing data’s visibility …

کلمات کلیدی پرکاربرد در این اسلاید پاورپوینت: datum, variable, e.g., server, dap, opendap, type, function, service, …, dap۴, user,

این فایل پاورپوینت شامل 16 اسلاید و به زبان انگلیسی و حجم آن 3.26 مگا بایت است. نوع قالب فایل ppt بوده که با این لینک قابل دانلود است. این مطلب برگرفته از سایت زیر است و مسئولیت انتشار آن با منبع اصلی می باشد که در تاریخ 2019/05/17 03:57:12 استخراج شده است.

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