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This is highly preferred when you have to download a large number of variables and years. ERA5 netCDF are offered in two different formats: either at hourly time steps, or at monthly averages (see this). If you need a sub-monthly time steps the global files for many variables for long time periods are extremely heavy in terms of disk space.
Where can I download Landsat 7 data as GeoTiff. I want to test a program for image classification that uses GeoTiff data with a separate file for each band. So I'm looking for some sample satellite data, preferably of Landsat 7, that doesn't need any further correction or pre-processing (I'm not familiar with these things and just want to do a ...
I am looking for historical hourly temperature data from many cities in the US what other data sources are there except wunderground? UPDATE: I will use the data to compare stations from the same city and need data with high temporal & spatial resolution; currently, one year of data is enough.
Add delimited text layer and try raster interpolation. Download a free coastline vector and clip your raster with the coastline. A few searches at GIS SE can help you out if you get stuck. With a GIS option, it is easy to also plot e.g. cities or extract the interpolated temperature for a location.
Using Matlab, you can do ncgeodataset (http://code.google.com/p/nctoolbox/wiki/ncgeodataset) to subsample the netcdf without having to download large datasets. For instance,
You can download the data from the CRU-NCEP database https://crudata.uea.ac.uk/cru/data/hrg/ CRU stand for Climate Research Unit and it has the most accurate historical data available to the public. They are reanalyzed data from meteorological stations and ships.
CMORPH can be downloaded from Download URL. If you are only downloading via OPeNDAP you can get it from the RDA RDA CMORPH1 and RDA CMORPH2
I need elevation data with lat and long for a project worldwide. By intuition I would say that a GeoTiff would be suitable, e.g. the one from https://asterweb.jpl.nasa.gov/gdem.asp. Are there better ones, or does this one not contain any elevation data? Does anyone know where there are open source Geotiffs that are good?
You could download one of those and process these temperature data using a simple resampling procedure bringing it at the resolution you are interested in by using CDO or another similar software. The procedure could be based on a bilinear interpolation of the original data with a finer grid.
In old computers memory capacity & calculating speed was an issue. In binary digits, integers are half the size of floating point numbers & a quarter the size of double precision numbers. Hence the use of integers speeds up calculations & requires less memory (disk drives, tape & RAM) than floating point numbers.