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Questions tagged [data-formats]

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5
votes
0answers
61 views

Why is satellite imagery data delivered as signed 16 bit integers?

Landsat 5 tm reflectance product images are delivered as signed 16 bit images, why is this preferred to unsigned 8 bit that the DN's are stored as level 1 products for the same satellite? Look at ...
4
votes
1answer
360 views

What is the relationship between raw seismic data, CMP Stacking, NMO & Machine Learning

I recently joined a geophysics project to assist with some of their machine learning modeling but am trying to gather the domain knowledge required to participate. Something I don't quite understand ...
4
votes
0answers
80 views

How to read EUMETCAST GOME-2 data?

We receive EUMETCAST data with different formats in our local station, I am having the most difficulty when trying to read or sometimes even know the format of a specific data product, in this case, ...
7
votes
1answer
103 views

Regarding compression, shuffle filter of netcdf4

I read the doc but still have no idea about what are the advantages to enable or disable the shuffle, what level [0-9] of compression is optimal, what's the best choice of chunk size?
6
votes
1answer
271 views

Conversion of BUFR format into grib

I am looking for Upper Air Observations (UAO) for Bay of Bengal region. I found NCEP ADP UAO dataset available in BUFR format. I am supposed to use UAO data in grib format only for the purpose of data ...
4
votes
1answer
931 views

SEGD and SEGY recorded data

What is the difference between a segd recorded data and a segy recorded data and can we convert from segd to segy and vice versa?
2
votes
1answer
112 views

Why do values stored in data files, such as climate model output, appear to be high?

I'm in doubt of some values for future scenarios of climate change that were downloaded from http://www.worldclim.org/version2. For example, the NCAR circulation model for ...
0
votes
0answers
221 views

Creating SEGY header for multishot seismic synthetic data

I am trying to convert synthetic shot gathers (n shots) for a 2D model into a single SEGY file. For an illustration of geometry, I have attached a snap of my sources (in red) and receivers (in blue) ...
9
votes
1answer
527 views

NCEP reanalysis model levels

ECMWF Model Levels The above link describes the coefficients used to define the ECMWF model levels in pressure in order to compute geopotential height. Is there a similar data for NCEP reanalysis ...
3
votes
0answers
80 views

Algorithm confirmation for bringing in scalar field values from Gaussian grid to rotated lat lon grid

I am posting an algorithm (more of a procedure description) and I request a review of the correctness of the algorithm. Goal - To bring in scalar field values such as temperature, geopotential height,...
5
votes
1answer
120 views

Why is there a logarithmic grid on this plot?

Why is there a logarithmic grid when these wireline density and neutron porosity logs have linear scale labels, and when these logs are usually displayed on linear scales?
4
votes
1answer
64 views

GIMMS NDVI3g grid cells not entirely square-shaped?

The official data description of the recently updated GIMMS NDVI3g record describes the grid parameters of the dataset as follows. ...
3
votes
2answers
341 views

How do I read IASI GDS L1C in Python?

I'm trying to read IASI GDS Level 1C data (all spectral samples) in the EUMETSAT EPS Native Format, as documented in the Generic Product Format Specification (PDF, 738 KB, 72 pages) and the IASI Level ...
4
votes
1answer
64 views

Where to start with P190s Seismic Navigation Files?

I have a few P190s navigation files from a 2D reflection seismic acquisition shoot and wondering what the best way was to extract UTM's (or latitude and longitude) and depth. I am reading through the ...
10
votes
2answers
730 views

How to read NOAA/NASA GOES satellite data?

I requested satellite image data (GVAR_IMG) for a project that I am working on from the GOES satellite, but I don't know what format it's in or how to read it. When I open it with a text editor it is ...
7
votes
2answers
899 views

What are the fields in Petrel's IESX seismic horizon file?

I have a text file containing 23 seismic horizons from Petrel, Schlumberger's seismic earth interpretation and modelling tool, using the 2D IESX format. Here are the first few rows: ...
7
votes
1answer
3k views

CDL File Questions

I'm confused by what exactly a CDL file is and what its purpose is. Unidata specifies the syntax of such a CDL file in its netCDF documentation. Questions: Are CDL files designed to be opened by a ...
3
votes
1answer
287 views

How to determine the number of bytes in the SEGD Revision 1 interblock gap

How can one determine the number of bytes in the SEGD Revision1 interblock gap? The quantity is present on page 5 of the standards document.
7
votes
0answers
179 views

NASA GLAS Lidar Data Format [closed]

NASA GLAS Lidar Data can be downloaded here. I cannot find (or perhaps understand) the answer to my question on the icesat/glas page. Lidar data can be provided as points (las) or raster (dem), ...
12
votes
1answer
364 views

Where and how can seismic data for earthquakes and volcanoes be downloaded?

I need it in this format. I went to USGS and IRIS websites but couldn't understand the downloading procedure
1
vote
1answer
514 views

How to perform precipitation data analysis? [closed]

I want to make precipitation data analysis for the Latvian territory. I only have meteorological stations and reanalysis data. My data from meteorological stations are in the format: ...
19
votes
4answers
2k views

What would a replacement for SEGY look like?

I have been having a miserable time this week reading SEGY files. This is data from the largest seismic acquisition company in the world whose client is the 7th largest oil company in the world. So if ...