21 votes
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Free radar (SAR) satellite data

You can get Sentinel-1 data from scihub.esa. Requires only registration (And most likely, non-commercial use). As Sentinel-1 has just become operational the archive is not very extensive but should ...
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  • 422
11 votes

Identifying image location?

IMAGE REVERSE SEARCH WITH GOOGLE IMAGES Doing a reverse search using images.google.com I found this link from wikimedia commons: https://commons.wikimedia.org/wiki/File:M%C3%...
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11 votes
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Is it possible to get satellite image tile sets from something like openmaptiles tiles offers?

EDIT as 2019-06-18: HRO (High Resolution Orthoimagery) is no longer available on https://viewer.nationalmap.gov/basic/. Instead, visit https://earthexplorer.usgs.gov/. You'll need an account (free to ...
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  • 1,513
10 votes
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Why does the resolution decrease with increasing incidence angle in the Sentinel-1 SAR sattelite

Think of the geometry. The incidence angle refers to the angle from nadir, or directly beneath the satellite, which would be 0°. As the sensor looks out to the sides from this nadir, the angle of ...
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10 votes
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Is this satellite image of a blackout real?

NASA's "Black Marble" is not one satellite image, but a mosaic gathered over several weeks and heavily edited: The data was acquired over nine days in April 2012 and thirteen days in October 2012. ...
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  • 8,217
10 votes
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Free satellite data availability for moon

Perhaps the following links might be useful: http://ode.rsl.wustl.edu/moon/coverage/ODE_Moon_shapefile.html https://webgis.wr.usgs.gov/pigwad/down/moon_dl.htm https://webgis.wr.usgs.gov/pigwad/down/...
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  • 72.4k
10 votes
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How do I add projection to this NetCDF file? (Satellite)

It appears that the projection information is stored using CF conventions. import rioxarray # for 'rio' accessor import xarray xds = xarray.open_dataset("glm.nc") Here is what is in xds: <...
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  • 5,807
8 votes

Mosaicking rasters in GRASS GIS

You can use r.patch for that (see help file) You probably want to set the region first to encompass all raster layers, after which you can use r.patch to 'mosaic' the layers. The following example is ...
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  • 1,673
8 votes

Samples of 5 cm per pixel satellite imagery?

There is no satellite with a 5cm resolution. The best one that is available is 30cm (worldview 3, panchromatic). There are rumors that the military/secret service still have better ones in orbit (11. ...
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  • 6,045
8 votes
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Is there an online catalog for declassified Soviet Union Spy Satellite images (Zenit-4, Resurs-F1, Okean)?

As others have shown interest for this question I'll answer it using the information I've been able to gather so far: There might be more than one archive or old Soviet Union imagery. As there were ...
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  • 1,174
8 votes
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Noisy lines in all scenes for Landsat 7?

You should read about the Landsat 7 ETM+ SLC-off data This refers to all Landsat 7 images collected after May 31, 2003, when the Scan Line Corrector (SLC) failed. These products have data gaps, but ...
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7 votes
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How to know which satellite took the image?

According to https://www.digitalglobe.com/sites/default/files/ISD_External.pdf you should have a field called satellite with a mnemonic like: “QB02”, “WV01”, “WV02”, “WV03”, “GE01”, “Aerial” Which ...
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  • 11.9k
6 votes

What satellite imagery would help to show spring locations?

As someone who did feature capture from imagery for a while, I would caution you against expecting a pool at a spring. The majority of the ones I've encountered (both in capture and on the ground in ...
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  • 15.5k
6 votes
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Free Web-service providing Satellite Images

Landsat is now available via Amazon Web Services Landsat 8 data is available for anyone to use via Amazon S3. All Landsat 8 scenes from 2015 are available along with a selection of cloud-free ...
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  • 48.6k
6 votes
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Colour matching satellite imagery from different time periods

The effects you are seeing are atmospheric effects due to differences in atmospheric aerosols, sun angle, and Rayleigh scattering. Since you have two scenes of the same location, though at different ...
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  • 50.3k
6 votes

Free radar (SAR) satellite data

Only managed to find a couple of sources for SAR images and data: You can download SAR images from here which are mostly focused on ecological sites such as forests: You can download SAR samples ...
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  • 72.4k
6 votes
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Satellites to retrieve UV bands

The US Naval Research Laboratory has developed the "Special Sensor Ultraviolet Spectrographic Imager" (SSUSI). Versions of it have been aboard DMSP satellites since 2003, improving in accuracy. It ...
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6 votes

How precise are overpass times of sun-synchronous satellites?

I am not a specialist of orbits, but I'll try to answer. Given a theoretical overpass time on a sun synchronous orbit, the exact one is not that easy to determine, as it depends on a lot of factors. ...
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6 votes

Satellite image disappearing when zooming in

It's probably a missing tile. If that's the case, it has nothing to do with the fact that this is satellite imagery. It's because you're accessing remotely stored data that is broken up into tiles, ...
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  • 23.1k
5 votes

Calculating new satellite position given pseudorange measurements

Algebraic solutions are not very common for GPS, however, several do exist. The most well-known one is probably Bancroft's. Others are Abel's and Kleusberg's.
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5 votes

Free radar (SAR) satellite data

JAXA have made global L-band SAR mosaics at 25 m spatial resolution available from the PALSAR sensor: http://www.eorc.jaxa.jp/ALOS/en/palsar_fnf/fnf_index.htm Registration is required to download ...
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5 votes

Free radar (SAR) satellite data

Sentinel-1 data is published as Open Data, with attribution, see licence here. Registration required. An API is provided. See Scientific Data Hub for details. Software is also provided to process ...
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  • 345
5 votes

Satellites to retrieve UV bands

You won't have much luck finding a satellite that provides data from the ultra violet (UV) portion of the electromagnetic spectrum. The reason is that the wavelength of UV energy is so short that most ...
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  • 8,604
5 votes
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view zenith angle and view azimuth angle with Quickbird

First, there is problably a typo in your question, but here are the sun angles solar zenith angle = 90 - meanSunEl solar azimuth angle = meanSunAz this is also valid for the mean satellite angles ...
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  • 48.6k
5 votes
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NASA world view (EOSDIS) coverage delay per day - scanning footprint issue?

Together Terra and Aqua image the entire Earth every 1 to 2 days. The cross track swath is about 2330 km (about 3000 km is needed for "true" daily global coverage). Compared to the geostationary ...
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  • 48.6k
5 votes

Is there an online catalog for declassified Soviet Union Spy Satellite images (Zenit-4, Resurs-F1, Okean)?

I'm afraid, but there is only little chance, that such images will be in wide access. Most part of such images is still on film source, not in digital. Maybe there are resources, forums, trackers etc.,...
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  • 309
5 votes

Determining if Sentinel-1 orbit is ascending or descending from absolute orbit number?

For the quick and dirty way to find out if it is ascending or descending, it is easier to look at the start (or end) time. For instance, in Belgium, you get the ascending images at around 5 PM and the ...
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  • 48.6k
5 votes

Python folium package for 'satellite' map

You can also use ESRI Satellite for satellite images. I used this: tile = folium.TileLayer( tiles = 'https://server.arcgisonline.com/ArcGIS/rest/services/World_Imagery/MapServer/tile/{z}/{y}/...
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5 votes
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Compress Large size of satellite image by Open Source GIS software

When in doubt follow Paul Ramsey's GeoTiff compression for dummies strategy. gdal_translate \ -co COMPRESS=JPEG \ -co PHOTOMETRIC=YCBCR \ -co TILED=YES \ 5255C.tif 5255C_JPEG_YCBCR.tif and ...
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  • 75.1k
5 votes

Is it a sank ship please see near japan

This is not a ship that sank. It is a result of how the background image is made up of a large number of images that are combined. Google uses a multitemporal approach to creating their basemap and ...
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