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

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12 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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57 views

How to analysis the spatial distribution similarity?

There are three different data source aiming at atmospheric chemistry research: Simulated concentration of ground level air pollutant Satellite retrieved concentration for the same area. ...
0
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2answers
134 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 ...
4
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2answers
51 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/...
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0answers
22 views

Downloading high resolution multi spectral commercial satellite images

how can i download high resolution multi spectral commercial satellite images like rapid eye, worldview etc. that have less return period like 1,2 or few days .And i need image of Pokhara city of ...
4
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0answers
46 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. ...
2
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0answers
47 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 ...
3
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1answer
23 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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8 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 ...
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1answer
12 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
27 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
62 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
36 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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20 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 ...
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2answers
52 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
32 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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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: http://mirador.gsfc.nasa.gov/cgi-bin/mirador/granlist.pl?page=1&dataSet=OMUVBd&version=003&allversion=003&...
2
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177 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
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1answer
43 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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0answers
37 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
24 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
50 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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74 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
169 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
148 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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35 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
64 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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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; ...
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1answer
265 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
64 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
76 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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1answer
93 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
183 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 ...
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1answer
243 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 https://scientiaplusconscientia.wordpress.com/2014/11/...
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35 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
199 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
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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
110 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
149 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
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1answer
161 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
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2answers
187 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
82 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
114 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
69 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
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1answer
59 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
69 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 ...
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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 ...