13 votes
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Is there a freely usable map of Earth cave systems and/or density?

You might like to check World Cave List which has a pretty extensive list of caves, their depths, and lengths. For example: This list has been automatically produced from our World Caves Database. ...
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13 votes
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Where can I get archived hourly temperature data?

The authoritative sources for your data are: ASOS: Automated Surface Observation Systems at airports, and MADIS: the Meteorological Assimilation Data Ingest System, from NOAA Those are collections ...
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  • 4,060
12 votes
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Does anyone know of a comprehensive listing of geostationary weather satellites?

The WMO OSCAR database is a list of all Earth observation satellites¹. The resulting table can be sorted by orbit type, status (inactive/operation/planned), agency, and other aspects. From their own ...
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10 votes
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What is the status of meteorological data exchange standards?

I don't think there can be "the single standard" for a range of technical and organisational reasons. Probably the biggest thing to note is that different formats serve different purposes. For ...
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  • 338
9 votes

Where can I obtain ocean wave data of the Southeast Asian region?

The only open and ongoing data source for in-situ ocean wave measurements I am aware of is the National Data Buoy Center. Though NDBC manages data service from plenty of moored buoys in the Gulf of ...
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  • 4,925
8 votes
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Public sources of topographical data of Earth?

This is an interesting and common question, so I'll try to give a good answer here, that I think is a good place, as well as GIS and Open Data SE. First, regarding the format, you will never find data ...
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8 votes

Global areas below sea level dataset?

You could try building one using a global Digital Elevation Model. There are several freely available like TanDEM-X, SRTM, or ASTER GDEM. You'd have to look for all the pixels containing a negative ...
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7 votes
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Sea Surface Height Data

The easiest global sea surface height database is from Aviso: http://www.aviso.oceanobs.com/en/data/products/sea-surface-height-products/global.html Aviso has been distributing Topex/Poseidon and ERS ...
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7 votes

Where can I get archived hourly wind speed data for Germany?

The MERRA dataset has data for the world from 1979 to date. It updates frequently. You can get the data as HDF or NETCDF. If your GIS package doesn't read those, there will be translation packages ...
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  • 4,060
7 votes
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What kind of data is best shown in a rose diagram?

Rose diagrams, also called polar bar plots, are useful for showing azimuthal (directional) data. Any dataset consisting of lots of measurements of direction or orientation could be visualized this way....
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7 votes
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Street and road data

Google Maps and MapQuest have gathered data and information through subcontractors and their own internal efforts. Their information is proprietary and is very hard to gain access to (and most methods ...
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7 votes
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Why does NOAA no longer provide sunshine data?

It was not discontinued Using the Climate Data Online tool from NOAA's website, I was able to get sunshine data through March 1st of this year for both major airports in my metropolitan area. ...
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  • 3,294
7 votes
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Freely available and re-distributable weather observations over the US?

Such a dataset can be found via the NCDC. Here is the main gateway. My 'go to' place for high temporal resolution data from NCDC is the 5-minute ASOS data.
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7 votes
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High-resolution georeferenced population data

For "historical" population data, you can refer to the Gridded Population of the World (GPW), version 4. This dataset makes available estimates of population at ~1 km resolution (30 arc second) for ...
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  • 1,248
6 votes
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Where can I get archived hourly wind speed data for Germany?

The most authoritative source for weather data in Germany is the German Weather Service (DWD). They have a climate data center that by now provides historical data free of charge. You can find it here:...
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6 votes

What is a source of worldwide temperature data that also includes extreme weather?

For Europe, I'd look into this dataset : http://onlinelibrary.wiley.com/doi/10.1029/2008JD010201/abstract This is a high-resolution gridded daily dataset derived from station data. However, this is a ...
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  • 439
6 votes

What is a source of worldwide temperature data that also includes extreme weather?

CLIMDEX, the "Datasets for Indices of Climate Extremes" is probably the closest you are going to get, for any pre-computed indices. The 27 indices it includes are listed on the indices page of that ...
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  • 5,317
6 votes

Predicting school closures with historical weather prediction data?

I'm not aware of any datasets that are quite what you want (archived point forecasts for the next day). There is less digestible data out there though. NOAA NCDC archived messages This website has ...
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Predicting school closures with historical weather prediction data?

The National Digital Forecast Database (NDFD) is archived by NCDC here: http://nomads.ncdc.noaa.gov/data/ndfd/ The NDFD contains gridded forecasts across the U.S. produced by NWS forecasters. You can ...
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6 votes

Where can I find the record for the heaviest single-day rainfall ever recorded on any date at a specific location?

Sounds like your question, like most questions about historical data, might be a little challenging to find the right source, as it often is around the world. But seeing you said Atlanta brightened ...
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6 votes

What is the (average) velocity of ocean currents?

This is not meant to be a comprehensive answer: Sometimes the easiest way to calculate the velocity of an ocean current is to take the published transport of the current and divide by the total depth ...
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6 votes
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If the study of "minerals" is covered by inorganic chemistry

The study of minerals is the field "mineralogy" In some ways it would be a subset of inorganic chemistry, restricted to crystaline materials of natural origin. However, mineralogy includes the ...
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  • 4,309
6 votes

How to make a Python function return the Moon's gravitational force (acceleration) to calculate orbits?

From my understanding, it should be possible to follow a similar procedure as what is done for calculating the gradient of gravity potential for the Earth (ignoring the potential corrections due to ...
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  • 233
5 votes

Sea Surface Height Data

For long-term sea level data, some of the PSMSL (Permenant Service for Mean Sea Level) datasets may be of use. These only cover discrete points, mostly tide gauges on coasts, but do so for the long ...
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5 votes

NCEP reanalysis model levels

Grid Resolution of the NCEP/NCAR reanalysis data The data is available on different grids depending on the variables of interest: The original grid is a T62 Gaussian grid, which grid cells do not ...
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5 votes
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where can I download ECHAM climate model data?

Where to find the data The German Climate Research Center (DKRZ, Deutsches Klimarechenzentrum) hosts the Word Data Center for Climate (WDCC). You can search the WDCC via the CERA Database (cera-www....
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5 votes

Does anyone have absorption coefficients at different wavelengths for sulfur dioxide?

The US National Institute of Standards and Technology is a good source. The following image show absorbance between 2.5 and 32 $\mu$m. For wavelengths shorter than 2.5 $\mu$m, other sources (less ...
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5 votes
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How much would weather data from ocean-going vessels improve climate research?

"Ship of opportunity" weather observations have contributed to global data collection exercises since the dawn of meteorology as a science. There are many national and international ...
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4 votes
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Deciphering NCDC data

The documentation linked from the datasets page states: Air Temperature (all units in Fahrenheit on PDF monthly form and tenths of degrees Celsius on CSV or text) EMNT - Extreme minimum ...
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  • 5,370
4 votes
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Remote Sensing System (RSS) historical atmospheric data continually updated

Being remote sensing, algorithms for inverting the raw data to get physical quantities may be improving with time. Perhaps a slight adjustment in algorithm or calibration happened between July and ...
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