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The other formats did not work either... I'll try to read my way into QGIS, but I'd still appreciate an answer...
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08-18-2017
02:50 PM
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I tried yesterday to read my way into QGIS. It seems to have a much better grip on NetCDF that ArcGIS, with a lot more options to extract and analyse the data directly, but I found it difficult to get started with QGIS. Esri does not have Geotiff, only tiff and gif and GRID and a lot of things I don't know... But it's still an idea, I'll try what happens with all the other formats! Cheers.
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08-17-2017
06:37 AM
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Yes, in a way, they're along two different paths to get my analysis. Extracting the time interval and putting it into a mosaic dataset would be great, but, as of now, also adding raster to the mosaic dataset does not work. A fallback option would include, extracting the time-slices separately as raster and processing them individually. Will take all night, but even that is not in sight...
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08-17-2017
05:44 AM
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Yes, it is in a way. They're both problems I have when trying to analyse NetCDF-Data. But I've researched and tried on all of these questions separately.
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08-17-2017
02:58 AM
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Hm, I don't think so. For example, I can make a rasterlayer from the netcdf-file, then it would contain all the years, and the question would be how to extract simply 2010, or how to condense it down to 2010. But if somebody can recommend a way to extract the data from the netcdf-file directly and then make a rasterlayer from the new file, or any other way to get just the year 2010, that's fine. Later on I want to add it to a mosaic datalayer and make some spatial analysis, so I will probably have to transform it to a rasterlayer along the way. At the end I will probably need a point-layer to aggregate it to NUTS2 regions...
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08-17-2017
12:44 AM
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Hi Dan, yes, my posts are all related. I broke the big question down into several smaller ones in the hope to get help with them. I've been researching thoroughly for over a week (at least as well as I could), I tried the toolbox, I downloaded the multidimensional extension, I found the solution to a silly bug, where arcgis reads my windows7-time-settings, I can read the netcdf-file now as raster and point(=vector)-file correctly, I watched several youtube-videos and the esri-video from 2013ish - I can't watch the 2hour tutorial, unfortunately, because of our licence somehow. But the tools don't seem to be for analysis with other rasterlayers, or for extracting files. There is one tool for extracting a timeslice as tif-rasterfile, but it relies on bands that I can't manage to put up. I also thought that I had rephrased the above question to simply ask for the spatial analyst tool, where I can find out, which % of each landuse is living below my rastercells... Too tired now, but will try tomorrow afresh.
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08-16-2017
03:44 PM
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I can select the right dimension, but that will just display this timeslice in the netcdf-raster, it does not extract a time interval. As far as I could make out, there tools in the toolbox are to create multidimensional layers (save the select tool, but that's just for display), not extract them. But maybe I've misunderstood?
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08-16-2017
03:21 PM
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In ArcGIS Desktop 10.4 (advanced licence) I downloaded a NetCDF-File from here: http://eca.knmi.nl/download/ensembles/downloadchunks.php (the 0.25 grid with the years 1995-2016). It consists of temperature-data over time (in days). I read it into ArcGIS as a NetCDF-Rasterlayer, and now I'm trying to export data of a single time-slice as a tif-rasterlayer. I did not get the hang on Mosaic Datasets, so my plan is to make a spatial analysis on the exported tif-rasterlayer, relating it to landuse (also in a tif-rasterlayer), and later aggregating it to NUTS3-Level). If I keep track what happens to which rasters I can later export other time-slices as tables and relate the spatial analysis to them. The export-function works in principle, but the raster looses it's attribute table, and without that I can't keep track which cell relates to which. Does anyone have a suggestion on how to get that working? Thanks a lot for any answer!
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08-16-2017
03:10 PM
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In ArcGIS Desktop 10.4 I have a NetCDF-File from this source http://eca.knmi.nl/download/ensembles/downloadchunks.php (grid 0.25, years 1995-2016), and am trying to add it to a Mosaic Dataset I already created. The data consists of temperature over time (in days). I tried two variations: reading the .nc-file as raster, saving as layer-file and then adding the layer-file to the Mosaic Dataset by the "add rasters to Mosaic Dataset"-tool. reading the .nc file directly into the Mosaic Dataset using the "add rasters to Mosaic Dataset"-tool. Here I also ticked the variable I need (tg). Both Variations gave the same result: the features are drawn, but the numbers are wrong. Don't know, where they are coming from, but it's obviously not taking the variable I ticked. Does anyone have an idea what I did wrong?
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08-16-2017
03:06 PM
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In ArcMap 10.4 (advanced licence) I have added a netcdf-file with EU-temperature-over-time data (time being every day between 1995 to 2016). I just need the year 2010 from this data, but I'm still struggling to extract this year. I'm new to python, and the only code I found to extract timeslices was accessing a band to extract the slice. It's from the esri support: http://support.esri.com/en/technical-article/000011318 . But I can't manage to make a band from the time dimension of my netcdf-file, ArcGIS always crashes somewhere along the way. I also tried by OPeNDAP-access to get just this one year of data, both downloading it directly from the website as dods, and trying to access the url, directly through the ArcMap tool (make OpENDAP-layer). The download page ( http://opendap.knmi.nl/knmi/thredds/dodsC/e-obs_0.25regular/tn_0.25deg_reg_v15.0.nc.html ) provides the url in a specific slot. But the tool could not connect with the URL, it gives the "error 000241: The specified pathname or file type is invalid for the required input". And I did not find a way to open .dods with ArcMap. Does anyone know a simple code-snippet I could have a go at editing as a beginner? Or is there a way directly in ArcMap to extract parts of the file? Ore does anyone have a solution to my OPeNDAP-Problems? Thanks for any help!
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08-16-2017
03:04 PM
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Dear Community, sorry that I can't ask anyone else - we don't have support at the moment, renewing it slipped through the timepressuregaps. If it helps, I figured that at some stage I have to convert raster to point layer and clip that with my NUTS2 regions. But the weighing problem is still weighing hard on me... Thanks for anyone taking it's time to help. Please give me a hint if my question is not stated clear enough or sounds chaotic. Best regards Bettina
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08-15-2017
09:09 AM
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In ArcMap 10.4 (advanced licence) I am trying to weigh temperature data in a netcdf-file according to landuse in a tif-rasterfile, and then aggregate that data to the areas of EU-NUTS3-regions, and I am searching for the right spatial analyst tools to do that. I haven't managed to read the NetCDF-file to ArcGIS correctly as a rasterlayer, but I didn't manage yet to add the layer to a mosaic layer, so until then even the spatial analyst tools that will work on a simple rasterlayer will be a great step forward. I have a netcdf-file with EU-temperature-over-time data (time being every day of several years), or single time slices of that file as rasterlayers, if computing NetCDF is too difficult a tif-rasterlayer with EU landuse data (industry, inhabited areas, agriculture and other vegetation/landcover) a shape with EU NUTS2-regions. I need to extract a table with the temperature for each NUTS2 region for each day of the year 2010, with the condition, that the temperature has to be weighted according to thermal loads. That means, depending on how much of the area of the temperature-rastercell is covered with industry or other inhabitation, the temperature gets more or less weight (for example, industry can get a weight of 2, normal inhabitation a weight of 1, everything else 0). My plan was to extract the year 2014 out of the whole range, put it in a mosaic dataset, then with some geospatial analyst tool weigh the landuse data on each of the temperature raster (the netcdf raster is larger than the landuse raster) and then make a statistical analysis of that on the NUTS3 areas. If the Mosaic Part does not work, then extract the 365 timeslices for 2010 as rasters and compute them singularly. I tried local, environment and overlay on simple rasterlayers, but they did not work. Can anybody recommend the right tools for the analysis? Thanks and Best regards Bettina
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08-15-2017
06:47 AM
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