12
votes
Accepted
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 ...
- 1,621
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%...
- 211
11
votes
Accepted
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:
<...
- 7,191
10
votes
Accepted
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. ...
- 8,546
10
votes
Accepted
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/...
- 75.2k
9
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}/...
- 91
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. ...
- 6,225
8
votes
Accepted
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 ...
- 1,219
8
votes
Accepted
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 ...
- 2,737
8
votes
Accepted
Numpy is not setting properly nan values: arr[arr== 0] = np.nan
Your arrays are not all nan.
It prints nan because that is how np.mean and np.std work, if the array contains any nans, the result will be nan.
You can use nanmean and nanstd instead:
import numpy as ...
- 68.6k
7
votes
Accepted
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 ...
- 13.3k
7
votes
Accepted
Satellite image in OpenLayers
Both maps that @Mike mentioned in his comment require API key. One possible satellite map is Esri's (ArcGIS) World Imagery:
var worldImagery = new ol.layer.Tile({
source: new ol.source.XYZ({
url:...
- 23.9k
6
votes
Accepted
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 ...
- 176
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.
...
- 762
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, ...
- 24.4k
5
votes
Creating shapefile showing footprints of Rasters?
Ensure images have defined nodata. If source images do not, fix with something like one of the below, where 0 or 255 is the supposed-to-be nodata value:
gdal_translate ... -a_nodata 0 ... outimage.vrt
...
- 28.1k
5
votes
Creating shapefile showing footprints of Rasters?
The Previous Answers worked for QGIS 2.x.
If you are reading this after 2020, you will find that the Answers don't work. What Works with QGIS 3.x is the plugin called IBAMA Processing.
Install this ...
- 41.1k
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.
- 250
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 ...
- 345
5
votes
Accepted
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 ...
- 49.4k
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.,...
- 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 ...
- 49.4k
5
votes
Accepted
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 ...
- 80.4k
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 ...
- 6,486
5
votes
Accepted
Correlating mol/m^2 with ton and lb?
One mol of NO2 is 46.0055 g (reference here) and 1 pound is 453.592 g so, conversion factor from mol to lbs is 0.1014 lbs/mol.
For converting mol/m2 to lbs/m2 in snippet code of this link Sentinel-...
- 29.6k
5
votes
Accepted
Can satellite data have different locations of nodata values in different channels
Short;
It will actually depend on what NO DATA values mean; are they representing missing values during acquisition? Or, as the production of these images requires many processing steps, erroneous ...
- 9,776
5
votes
Is Satellite Image Continuous Data?
Just to add to what @Kostas VI. mentioned: Measuring means always approximation. If the approximation is "good enough", you would consider it "reliable data". What that exactely ...
- 67k
4
votes
Accepted
Sentinel-2A: Begin of operational period?
Update: 11/30/2015 -- Open data access is 'imminent.' Expect to see it in the next two weeks.
I think they haven't released a date because they are not sure when everything will be calibrated and ...
- 1,477
4
votes
Difference between spatial and geometric resolution
Resolution can be quite confusing as some say that spectral=radiometric, others (1&2) differentiate between the two, and as you noticed, that Wikipedia page spends a whole lot of words trying to ...
- 11.6k
4
votes
Is this satellite image of a blackout real?
Theories:
On GIMP the light superposes very well for the two images, which is slightly suspicious.
Another concerns would be that Puerto Rico seems to have no generators?
Large cities like San Juan ...
- 1,852
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