Questions tagged [satellite]

In the context of spaceflight, it is an object which has been placed into orbit by humans.

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0answers
207 views

How to show a correct scale for mercator-based maps in print composer?

To be more specific: I have created a map in Pseudo-Mercator EPSG: 3857 using Google Satellite. So my layers, and my project, are all set to Pseudo-Mercator. How can I create a map in print composer ...
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569 views

What causes this rainbow image artifact in Google Maps satellite imagery?

I discovered this "rainbow" over the Yellowstone River in Google Maps: View the site in Google Maps: https://goo.gl/maps/y6xETmY859M2 You can see a distinct red, yellow, and blue streak hovering ...
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28 views

Does switching satellites by GPS receiver cause errors?

Suppose some GPS receiver getting information ("connected") from 4 satellites, and from some reason disconnected from one of the satellites, and instead connecting to new one, so in total still there ...
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1answer
175 views

Import GDAL_TRANSLATE IMAGE GOES-13

I have this questions, how to Import by GDAL_TRANSLATE IMAGE GOES-13? Whats is possible projection? Files: 1501201445G13I01.TIF Size is 14400, 12001 Coordinate System is `' Metadata: ...
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478 views

List of indices (e.g., NDVI) that can be calculated with satellite images [closed]

I'm looking for a list of published indices that can be calculated from satellite images and the corresponding formula for each: Some indicies, for example, would be: - NDVI: https://en.wikipedia....
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1answer
610 views

Can USGS High Resolution Orthoimagery be viewed online?

I found the USGS EarthExplorer where one can download their High Resolution Orthoimagery. This imagery can also be previewed in the EarthExplorer once a particular tile is found, but I wonder if there ...
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97 views

How to do regression analysis in SAGA for topographic correction

Currently I am trying to do the topographic correction using C-Correction. I would like to know if there is a way to do the regression analysis between L (uncorrected reflectance of each band from ...
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1answer
97 views

How to open and analyze Chandrayaan 1 Hysi data? [closed]

I have an archive of Chandrayaan 1 Hysi data that contains file formats .lbl, .qub data. What software should i use to visualize and analyze these data?
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1answer
262 views

Free satellite data availability for moon [closed]

What are the satellite raster and vector data sets available for mapping the moon that can be freely downloaded? I need to know the availability and type of the data sets from which mineral mapping, ...
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1answer
214 views

How can you know the sequence/names of the bands of a GeoTIFF file in Java?

I want to know the sequence of the bands (4 and more) of a GeoTIFF file for example whether the sequence is blue, green, red, near infra red, temperature, etc or green, blue, ... How can I know that ...
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1answer
242 views

How to know which satellite took the image?

I am having trouble finding which satellite took the images I have. Most are from digital globe. I read through the metadata and the .imd file. I found date and time but not the name of the ...
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4answers
1k views

Is this satellite image of a blackout real? [closed]

Puerto Rico is currently experiencing a massive blackout. 1.5 million homes without electricity. There is a meme circulating with the satelittes of the carribbean before and during the blackout. ...
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132 views

How to cache Google Satellite images? [duplicate]

Is it possible to download all tiles at all available zoom levels for an entire large city from Google Satellite view layer and if so how to do that through use of available open source software? I ...
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1answer
167 views

How does the Phantom 3 4k UAV assign the coordinates/geotag to each photo?

I read that the Phantom 3 used to use a barometric reading but now it uses GPS. Does it take a new reading from the GPS/Glonass satellites every time it takes a photo or does it base every photo from ...
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2answers
315 views

Why locate GPS control/monitor segments near equator?

It's well known why we launch satellites near the equator, but why are the GPS control/monitor segments located near the equator at Hawaii, Ecuador, Florida, Bahrain, Ascension, Diego Garcia, Guam and ...
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1answer
90 views

Satellite signature of reindeer carcasses

In a recent incident (august 2016) in the Norwegian mountains 322 reindeer (rangifer tarandus) were killed by lightning. The carcasses position are documented, although only by point data and not ...
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2answers
215 views

How does my phone get an accurate reference time for calculating distance from GPS satellites?

So if I understand this correctly, my phone uses trilateration to figure out a position in 3D space using the distance from various satellites. In order to figure out the distance from those ...
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77 views

How is range calculated by a GPS receiver?

I wanted some help on understanding how range is calculated by a GNSS/GPS receiver(rx), I tried looking on google, but can't find the required results. C/A codes repeat every 1 ms and the rx delays ...
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1answer
150 views

Annotating satellite images in the field

I have high res satellite imagery of my remote field location through Planet. I am working with indigenous communities on participant action mapping and would like to be able to annotate my images in ...
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1answer
311 views

Extracting some part of a satellite image using mask?

I'm trying to extract some part of a satellite Landsat-8 image. using another image. I have the following satellite image: and I want to keep only the areas from the satellite image which are ...
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3answers
1k views

Samples of 5 cm per pixel satellite imagery?

Are there samples of 5 cm per pixel or better resolution satellite imagery especially for a city or urban area ( street view level)? Also are there providers of 5 cm per pixel satellite imagery for ...
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0answers
62 views

Find densest point in satellite agriculture map [closed]

I have a .tiff image file with 3 bands. I want to write a program, (python opencv?), that will find the first N densest points in the region. Densest, meaning the point with the most of its own ...
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2answers
2k views

How to find out whether a satellite image is atmospherically corrected

I have a satellite image and I am not sure whether an atmospheric correction has been done with the image. Is there a way to find that out by looking at some values? A atmospheric correction was ...
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2answers
323 views

Pattern search in satellite imagery

I would like to search for the specific buildings (polyhouse in my case) on the map like the one shown here Are there any free options available which can give me lat and lng of such shapes/features ...
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269 views

Using QGIS for current SAR (Search And Rescue) operation?

A friend of mine, Christiaan Wilson is missing since 15 may during descending the Dhaulagiri mountain in the Himalayas. One searching team has already finished one operation. A second is on the way. ...
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1answer
810 views

Publicly accessible (near) real-time satellite imagery

The operators of the Himawari-8 weather satellite provide a fresh full-disc picture of Earth every 10 minutes. This is a great resource and powers applications such as RealEarth. Are there any other ...
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1answer
73 views

Except from Hyperion do you know any other hyper-spectral satellites?

There aren't many images for my research area. So I am looking for other hyperspectral satellites. Or maybe another site except USGS? The area is near here "40.223124, 23.031155"
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1answer
48 views

What is the standard method of finding satellite positions in between the 15 minute intervals in an SP3 file?

SP3 files provide satellite positions for every 15 minutes. How would you find the satellite position at a time between two logged positions, i.e. 7 minutes after the last logged position? I can ...
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1answer
41 views

Working Alone Satellite Devices

I am researching potential tech solutions for personnel to use out in remote areas in the event of an emergency situation. I have been told I need to 1) find satellite based solutions as the phone ...
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1answer
51 views

MODIS emissivity extraction using ArcGIS Desktop?

I am doing validation of 40 Landsat images.now I need two spectral emissivities of the 8-day MODIS land surface temperature and emissivity product (MOD11A2).and I have to extract emissivities for ...
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1answer
218 views

Is GRACE satellite data freely available? [closed]

Is GRACE (Gravity Recovery And Climate Experiment) satellite data freely downloadable/available to users?
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1answer
573 views

Maximum Solar Zenith Angle for Landsat-8 images

Heliosynchronous satellites enter a darkness region at high latitude in winter. They are most of the time programmed not the capture an image when the solar zenith angle becomes too large because the ...
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1answer
46 views

What resolution will be able to show visible changes on a parcel of farm land? [closed]

What resolution will be adequate (5m, 2.5m, etc) to show visible changes on a parcel of farm land? Each plot is typically the size of two football pitches. Details to detect: a) has the farm land ...
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1answer
676 views

Identifying bands of satellite images qgis

I have a series of satellite images and am not sure which satellite took them. I know there are 8 bands but not which band relates to which spectral color. Here is the metadata of one image : Driver ...
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1answer
82 views

Satellite data to watch atmosphere and ionosphere

Which bandwidths are best suited to watch atmosphere and ionosphere of a region? And what are the sources (satellite sensors/names etc)? Any suggestion would definitely help me to narrow down my ...
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1answer
6k views

Is it possible to query/download satellite images with Python?

I was wondering if there exists a Python library/API for downloading satellite images. Ideally, I would want to enter the latitude and longitude of a bounding box and get a high resolution image ...
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1answer
573 views

How to define a threshold in Principal Component Image for Urban mapping?

I am working on an Urban mapping and i would like to know how i could define a threshold value for extracting built-up areas from a PC (Principal Component) Image ? I am interesting on how to ...
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1answer
243 views

Assigning latitude and longitude to a particular pixel in satellite image

Pixel of a satellite images can be assigned latitude and longitude, but how this is done as each pixel represent certain area depending on the resolution of image that can be too high to assign ...
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0answers
89 views

Mosaic with LISS-III RESOURCESAT-1 images

I'm having problems with dark edges in normal or virtual catalog (.vrt) with LISIII LISS-III RESOURCESAT-1 mosaic. If I put no data value 0 in properties, change border by white (see figure) and I ...
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1answer
73 views

High res monthly satellite maps including ice cover

I have some old month by month NASA satellite maps showing the world in 2004 at 5400x2700px. I've noticed NASA has newer cleaner versions of these maps at http://neo.sci.gsfc.nasa.gov/view.php?...
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361 views

Python script to automate saving satellite images for different combinations of lat longs

PS. : This is my first try at a GIS application. Please forgive if my question is pedantic. I would like to get a series of satellite images all at the same scale centered around different points on ...
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2answers
857 views

How precise are overpass times of sun-synchronous satellites?

sun-synchronous satellites, as their name say, acquire scenes at the same solar time of the day when they pass over the same location. According to this site, sun-synchronicity is achieved by taking ...
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2answers
698 views

How to determine objects area (size) measurement error using satellite images?

I am working at scientific paper about measuring object's size (it's area) using satellite images. I got some progress in it and need to compare my results with other scientific works. I have found ...
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1answer
105 views

Source for high resolution satellite images

I am looking for high resolution imagery of the Nicobar Islands. Ideally 3 images (2004, 2005 and 2014/15). My budget is 1500 USD. Which image providers would you advice? Until now I have only worked ...
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0answers
87 views

Guide to aerial or space data types and availability

I am overwhelmed by the variety of types of satellite and aerial data (images?) available online. For example, at the USGS Earth Explorer data page, I see AVHRR; CEOS;Ikonos and OrbView; EO-1; GLS; ...
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1answer
5k views

Difference between spatial and geometric resolution

Wikipedia quotes Campbell 2002 as saying: Spatial resolution is defined as the pixel size of an image representing the size of the surface area (i.e. m2) being measured on the ground, determined by ...
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1answer
87 views

Does anyone know of satellite imagery, such as Bing, that I can use to create my own polygons in QGIS by tracing?

For my study area, in western England I would like to effectively trace over certain fields to identify them as intense agricultural fields (such as bright green ones). I know Google Earth and ...
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1answer
661 views

Acquiring Digital Elevation Models for Argentina from commercial providers

I'm interested in obtaining Digital Elevation Models for areas in the 20,000 acre range, as I use them to create contour maps for agriculture. The USGS Earth Explorer has a wonderful free DEM ...
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2answers
1k views

Print composer problems Qgis 2.8 Wien with Google Satellite [duplicate]

I am having serious problems in exporting a map (Google satellite map) linked to QGIS. Using the print editor I clearly see the part of the map I want to print and also in the right scale, but when ...
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2answers
252 views

Sentinel-2A: Begin of operational period?

This also might be of interest here, as it is an important data source: When does Sentinel-2A finally become operational and deliver images regularly? I tried to find information on that, but ...