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| public:lta_howto [2017-03-08 15:27] – external edit 127.0.0.1 | public:lta_howto [2017-10-16 12:38] – [Staging data (Prepare for download)] Reinoud Bokhorst |
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| This is a short manual on how to search for and retrieve data from the LOFAR Long Term Archive. | This is a short manual on how to search for and retrieve data from the LOFAR Long Term Archive. |
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| To access the LTA, go to: [[http://lofar.target.rug.nl|lofar.target.rug.nl]] | To access the LTA, go to: [[https://lta.lofar.eu|lta.lofar.eu]] |
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| For background information and in case of problems, please refer to the [[public:lta_faq|Frequently Asked Questions]] page. | For background information and in case of problems, please refer to the [[public:lta_faq|Frequently Asked Questions]] page. |
| === Project data === | === Project data === |
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| To directly access project-related data in the LTA you need to have an account in [[https://lofar.astron.nl/mom3|MoM]] that is enabled for the archive. | To directly access project-related data in the LTA you need to have an account in [[https://lofar.astron.nl/mom3|MoM]] that is enabled for the archive. This automatically happens if you were a member of the original project proposal in Northstar/MoM. |
| - This automatically happens if you were a member of the original project proposal in Northstar/MoM. | |
| - Otherwise Science Operations and Support can add you to the project for which you need access upon request. | |
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| If you were not originally a member of the project in MoM, you can request to be added by Science Operations and Support. When you send such a request, you must add the project's PI in cc. After Science Operations and Support adds you to the project, you might get an email asking you to set a new password in [[https://webportal.astron.nl/pwm/private/Login|ASTRON Web Applications Password Self Service]]. Please note that this will set a new password not just for the LTA //but for MoM (LOFAR/WSRT) and Northstar as well//. | If you were not included among the co-authors of the project but are still a collaborator, you can request to be added by Science Operations and Support. When you send such a request, you must add the project's PI in cc. After Science Operations and Support adds you to the project, you might get an email asking you to set a new password in [[https://webportal.astron.nl/pwm/private/Login|ASTRON Web Applications Password Self Service]]. Please note that this will set a new password not just for the LTA //but for MoM (LOFAR/WSRT) and Northstar as well//. |
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| ====== How to find data in the archive ====== | ====== How to find data in the archive ====== |
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| {{:public:lta_navigation.png|}} | {{:public:lta_menu.png|}} |
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| A "project" can be selected by registered users that have access to a specific project. Subsequent searches will then be done within that project. | A "project" can be selected by registered users that have access to a specific project. Subsequent searches will then be done within that project. |
| Searching the catalogue is easiest by selecting one of the otions in the "Search" menu. Depending on the knowledge of the data you are looking for (if any), searches can be performed on e.g., target ("Simple Search"), date and/or observation-ID and more advanced parameters per data type ("Advanced Search"). | Searching the catalogue is easiest by selecting one of the otions in the "Search" menu. Depending on the knowledge of the data you are looking for (if any), searches can be performed on e.g., target ("Simple Search"), date and/or observation-ID and more advanced parameters per data type ("Advanced Search"). |
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| Another option is to choose "Show Latest", which will show the latest additions in the LTA. This is particularely useful for project related searches. | Another option is to choose "Show Latest", which will show the latest additions in the LTA. This is particularly useful for project related searches. |
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| === Finding Data === | === Finding Data === |
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| {{:public:lta_observations.png|}} | {{:public:lta_observations_2017.png?900|}} |
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| Depending on the search parameters, e.g., which data products were requested (observation, pipeline), lists of observations and/or pipelines will be returned (see observations example above). From this point there are several options: | Depending on the search parameters, e.g., which data products were requested (observation, pipeline), lists of observations and/or pipelines will be returned (see observations example above). From this point there are several options: |
| Once you have a list of dataproducts, observations or pipelines, you can use the check boxes to select which files you want to download. The first check box can be used to select or deselect all files or observations on a page. | Once you have a list of dataproducts, observations or pipelines, you can use the check boxes to select which files you want to download. The first check box can be used to select or deselect all files or observations on a page. |
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| {{:public:lta_howto2.png|}} | {{:public:lta_staging_1.png|}} |
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| The LOFAR Archive stores data on magnetic tape. This means that it cannot be downloaded right away, but has to be copied from tape to disk first. This process is called 'staging'. | The LOFAR Archive stores data on magnetic tape. This means that it cannot be downloaded right away, but has to be copied from tape to disk first. This process is called 'staging'. |