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

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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 ...
3
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1answer
18 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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29 views

How do we know the Altitude of a Geosynchronous Satellite is correct? [closed]

Geostationary Satellites are about 26,000 miles above the surface of the Earth, Altitude is calculated by measurements taken from Barometric readings of Mercury reacting to Atmospheric Pressure; but ...
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0answers
6 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 ...
2
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1answer
22 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 ...
1
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1answer
10 views

MODIS emissivity extraction

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
25 views

Is GRACE satellite data freely available? [closed]

Is GRACE (Gravity Recovery And Climate Experiment) satellite data freely downloadable/available to users?
3
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1answer
59 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
35 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 ...
0
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0answers
13 views

Facing “unknown sensor error” in using Alos Polsar 2 (Geotiff format) at ENVI 5.3

For calculation of Radar Backscatter for Alos 2 (2015) whit Geotiff format via ENVI 5.3, I faced following error: "The target file does not appear to be a valid sensor type" The question is; how ...
1
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2answers
49 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 ...
1
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1answer
31 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 ...
0
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0answers
12 views

Spatial referencing OMI level 3 UV data OMUVBd

I would like to process the OMI level 3 UV data (OMUVBd) in netCDF format: ...
2
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0answers
126 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 ...
1
vote
1answer
39 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 ...
0
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0answers
31 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 ...
1
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0answers
22 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 ...
1
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1answer
49 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 ...
3
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0answers
73 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 ...
9
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2answers
164 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 ...
0
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2answers
135 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 ...
0
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0answers
34 views

Downloading data for surface temperature mapping

I'm doing a school gis project on analyzing the urban heat island effect on Denver, Colorado mapping surface temperatures. I tried downloading data from the Earth Viewer application but upon loading ...
0
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1answer
62 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 ...
3
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0answers
34 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; ...
1
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1answer
231 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 ...
1
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1answer
62 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 maps ...
2
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0answers
64 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 ...
1
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1answer
86 views

Print composer problems Qgis 2.8 Wien with Google Satellite

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 ...
4
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2answers
181 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 ...
1
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1answer
228 views

Create true color image from Sentinel-1 data

Is it possible to create or extract a true color (RGB) image from Sentinal-1 satellite data? Like with Landsat8 data described in this article ...
0
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0answers
34 views

Finding seasonal satellite map tiles?

I am working on an exhibit/geospatial visualization which shows the migration of marine animals over time throughout the year. I am searching for seasonal satellite map tiles. Does anyone know of any? ...
2
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1answer
161 views

Is there an industry-standard official mapping of Galileo satellites to global "PRN”/ID values?

In the U.S. GPS system, satellites are identified by the PRN number broadcast by each satellite. This ID is usually visible on most GPS receiver platforms that provide access to individual GPS ...
2
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1answer
61 views

NASA world view (EOSDIS) coverage delay per day - scanning footprint issue?

I noticed that in NASA world view web site it's take some time to get per day world wide coverage. I made some calculations: The source is Aqua & Terra satellites Both have orbital period ...
3
votes
1answer
75 views

Why NASA world view (EOSDIS) have black strips?

There is the famous NASA World View site based on EOSDIS. I relatively new to this and I wonder why & what are those black strips on the existing coverage? I also notice that the position of the ...
2
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0answers
105 views

How to Import Circular Polar Orbit (HDF5) data into ArcMap with WGS 1984 Projection

I'm currently trying to retrieve data from http://smap.jpl.nasa.gov/data/ and use it in ArcMap. The issue is that the data is curved towards the poles and so the bottom left of the extent isn't the ...
6
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1answer
142 views

Free open satellite or other remote sensing data for night time?

I usually work with daytime satellite images to do some image classification (mostly Landsat data from the USGS EarthExplorer). Right now I'd like to check at some night time images to work on city ...
1
vote
1answer
138 views

Getting netCDF data into PostGIS database using Python?

I can read the netCDF file data with netCDF-python or with gdalinfo, but I am unsure of the easiest way to get it into a PostGIS database. It would be really easy if I could convert the netCDF file ...
4
votes
2answers
167 views

Why does the resolution decrease with increasing incidence angle in the Sentinel-1 SAR sattelite

On this link (Sentinel1 webpage for a SLC product), the resolution is written as a range from the highest corresponding to low incidence angle, to the lowest resolution corresponding to high incidence ...
2
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1answer
81 views

Can a satellite go over the same area in different passes overtime

Can a sun-synchronous satellite (let's consider Sentinel-1) go over the same place, one time in an ascending pass and the next time (or few times after) in a descending pass?
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59 views

Raster map source for desktop, commercial application

We develop desktop, commercial application for Architects (c++). In a future update, we would like to provide our customers with the option to automatically create a 3D terrain with appropriate ...
2
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1answer
110 views

Get resolution and whether right/left looking from sentinel metadata

Is it possible in Sentinel hub products to know the resolution of the product and whether the SAR was right or left looking at the scene? I know that it's possible to know if the SAR was operating in ...
2
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0answers
68 views

Application of a Piecewise Logistic Function to Extract Seasonality Metrics

I am working with 16-day MODIS EVI (satellite) data and I want to fit a Piecewise Logistic Function through my 23 EVI data values. The following formula is for the Piecewise Logistic Function: y(t)= ...
3
votes
1answer
56 views

Why is part of the MODIS (MOD09) Swath missing?

I have been using the WorldView web application to identify clear sky days to download MODIS images. However there are some instances where I see a clear day image, then download the MOD09 product and ...
0
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1answer
68 views

comparison of atmopsheric correction methods

I have noticed that dos methods for atmospheric corrections are in the section of radiometric correction (i.toar) on grass gis.Does that means that dos is a method doing radiometric and atmospheric ...
1
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1answer
44 views

How to convert GOES-R (15) IR image from gray-scale to brightness temprature

How do I convert satellite IR images taken by GOES-R (15) from gray-scale to brightness temperature? We can download the IR satellite images, and read its RGBA values. But how can we convert this RGBA ...
2
votes
1answer
24 views

STATION_ID of satellite images

My question might be simple but can someone explain to me the importance of STATION_ID to satellite images?If the sensor is the same(e.g landsat TM) for 2 images but the STATION_ID is different (MLK ...
0
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0answers
45 views

remove black margin of georeferenced image before overlay to google maps

i used envi to georeference satellite imagery. then I tried to overlay that geo image to google map. all fines BUT the black margin appears on the map. is there any way to git rid of that black ...
4
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1answer
217 views

Using remote sensing satellite for chlorophyll mapping?

Location of my research are reservoirs which have an area of 47 and 62 km2. I need a better image resolution than Landsat(Pan).
1
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1answer
256 views

Error in downloading MODIS image using R script

I am trying to download "MOD13A3" MODIS image using R script (http://r-gis.net/?q=ModisDownload) but each time it's ending in error. How to make it work ? ...
0
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1answer
126 views

Finding Sentinel-1 data from the hub

Can somebody please tell me how to download data from specific locations on the sentinel-1 data hub? I cannot seem to get the geospatial search function to work... Many thanks for guidance!