Subject: Marine Geospatial Ecology Tools (MGET) help
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| From: | "Jason Roberts" <> |
|---|---|
| To: | "'Melanie Gomes'" <> |
| Cc: | <> |
| Subject: | RE: [mget-help] MGET tutorial |
| Date: | Mon, 3 Dec 2012 13:44:14 -0500 |
Hi Melanie, I’m still not sure where you are clicking. The URL you sent is where you end up, but unfortunately this does not correspond to what you clicked. The web server detects that you found a missing page and then redirects you to the page you sent, for some reason. Could you describe where you clicked? Maybe send me a screen shot? There is a tutorial on converting HDF files to ArcGIS format here. It might work for your SST and salinity files you are downloading, but I’m not sure. If those files are in netCDF format, the instructions are very similar; you just have to use a netCDF conversion tool rather than a HDF conversion tool. If you sent me an example file I might be able to give specific instructions. Regarding the GHRSST L4 SST. It sounds like you were able to download those successfully. Have you been able to view them at all? You mentioned you were not able to put them into a map. I’m not sure how I can help there. It should be simple enough to add them to the map; just click the add layer button (or whatever it is called) and drill into the directory in which you saved them, pick one, and add it. I do not know of any SST data sources specifically for the Irish and Celtic Seas. The best general-purpose dataset I know of for 1992-2008 is the NOAA NODC 4km AVHRR Pathfinder data. MGET contains tools for downloading this under the Data Products à NOAA National Oceanographic Data Center à 4km AVHRR Pathfinder Version 5 SST. These data run from 1981-2010 (MGET can currently only access data through the end of 2009, however). They are based on a continual series of U.S. NOAA polar orbiting satellites. I do not know of any other satellite-based SST data that cover this complete time period. MGET does not provide any special mechanism for accessing the ICES oceanographic data. If I recall correctly, these data are all in-situ point measurements taken from research vessels, buoys, and so on. Because these data are so sparse in comparison to remote sensing—they are point measurements taken infrequently, rather than images taken regularly—they are typically only used to create climatological maps, such as the mean SST for each season of the year. They are also usually lower resolution than remote sensing data. On the plus side, they often include measurements taken at depth, and include chemical or biological parameters; none of this is presently possible with remote sensing, except salinity, via the recent Aquarius satellite. We have an example of predictive habitat mapping here. It is getting somewhat out of date but can convey the basic idea, and includes a downloadable ArcGIS model that you look at. I’m sorry there is not a more comprehensive and updated example at this time. I appreciate your struggles with the technology. One of our goals with MGET is to try to bridge the gap between the many analytic methods and datasets developed by people who are programmers at heart and those who just want to use this stuff without having to learn programming. It is a difficult job… If possible, I encourage you to find some local collaborators who have strong technical skills who can lend a hand when you’re stuck. Best regards, Jason From: Melanie Gomes [mailto:] Hi Jason, Thank you for the help before I read you paper which was very interesting and has helped me get my head around what MGET can do. I was on the home page again and tried to click on the MGET tutorial as Im still not able to get the files into GIS although the page diverted to MGEL here: http://mgel.env.duke.edu/?s=&search_404=1 Do you have a turorial that would be able to help me with this in GIS? - the things I wish to do are convert files to GIS (the SST and salinity files which I have not fully downloaded yet as I am still looking for salinlity data in the years I need 1992 - 2012). The PO DAAC data you sent me (thank you for that) I have it for 3 years (Ifermer data set) and have contacted them to hopefully get the rest although I was going through the ARc tools and I clicked on the data products - GHRSST L4SST layer then create rasters for GHRSST L4SST although in the output workspace I am struggling to save it and not sure why this is. I downloaded these files into a folder accessible by GIS but have not got them on the map yet. Any help with this would be much appreciated. Thank you so much. Do you know where I would be able to get good SST data for teh Irish and Celtic Seas from 1992 - 2008 -to coincide with the PO.DAAC data set above? thank you. Does any of the ICES data sets go through MGET at all? Then after I get my data in I was to do the predictive habitat mapping for 4 species of ray hopefully using MGET which is also why I was hoping to get the tutorial as I am not sure how to do this. I am basically struggling with this and am not so technologically minded so will probably be alot slower then everyone else so any help with this is much appreciated. Thank you so very much Best wishes Melanie G1112 Centre for Coastal and Marine Research Cromore Road, Coleraine Co. Derry, Northern Ireland Email: From: Jason Roberts [] Dear Melanie, It turns out that something broke the “Need instructions? Click here” link. I just fixed it. Sorry about that! You should be able to access it now. It just goes to the same place as the Download button on the horizontal black toolbar. Currently, MGET does not have tools specifically built for the datasets hosted by ifremer. However many of the files hosted there are in formats that MGET can convert to ArcGIS. Some of them may be readable by ArcGIS directly using the Multidimension Toolbox. Finally, some of them are also hosted at places for which MGET does have some convenient tools for accessing. For example, I think the ODYSSEA GHRSST L4 SST dataset you mentioned is also hosted by NASA PO.DAAC here. MGET does have tools for accessing that dataset directly from NASA PO.DAAC. When you get it installed, look under Data Products à NASA JPL PO.DAAC à GHRSST L4 SST. You can also poke around in the other parts of the Data Products part of MGET and find some other convenient data, such as ocean currents from Aviso, ocean color products from the NASA GSFC OceanColor Group, temperature and salinity from the HYCOM ocean model, etc. These are not a comprehensive list of products by any means, but they are convenient to access: you can just run one tool to download whole sets of time series rasters in GIS format, plugging in the spatial and temporal extent of interest. We add new products every few months. Let me know if you have any questions, Best, Jason From: Melanie Gomes [] Dear Jason, Thank you so much for getting back to me I think part of the reason was my computer as the page http://mgel.env.duke.edu/mget looks different today although still when I click on the "need instructions click here" on the right in the box where it says "Download the latest MGET release" it still comes up with an error and defaults to another page and I cant see the instructions. Not sure why. It says error page not found 404 I think then defaults to this page: http://mgel.env.duke.edu/?s=&search_404=1 I am only really getting my head around it all and am going to be using environmental variables, temperature, salinity, predicted tidal currents to input into GIS. The layers I have for temperature are netcdf files from Ifermer which I was hoping to convert to a layer in GIS using your tool. (although I have just gone to the page where I was going to get the data and this has gone so will have to check up on it again: http://tds0.ifremer.fr/thredds/subcatalogs/DATA_CENTERS/CERSAT/ODYSSEA-SST-NRT/ODYSSEA-SST-NRT_VIEW_RUN.html Thank you so much look forward to hearing from you Best wishes Melanie G1112 Centre for Coastal and Marine Research Cromore Road, Coleraine Co. Derry, Northern Ireland Email: From: Jason Roberts [] Dear Melanie, Thanks for your interest in MGET. I’m not sure which help file you are referring to. Can you please send me the URL to that file and I’ll look at it? Also, can you tell me a bit more about what conversion you’re trying to accomplish? I might be able to point you to some better instructions. Best regards, Jason From: Melanie Gomes [] Dear Sir/Madam, Thank you for your free software for Arc 10.1 GIS which I am currently downloading at the moment. I tried to download the help file although it would not load although there was a place for a user name and password but no where to register (the website looked a little strange and maybe it was because on my laptop it did not open properly). I wondered would I be able to register to get the help to use the conversion for these files? I am a full time PhD student at the University of Ulster Northern Ireland. Thank you so much look forward to hearing from you Yours faithfully Melanie Melanie Gomes B.Sc. Hons. M.Sc. MSB PhD research student G1112 Centre for Coastal and Marine Research Cromore Road, Coleraine Co. Derry, Northern Ireland Email: |