Questions tagged [satellite]

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

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54 views

Seeking Public API to get GPS satellite's position?

Is there any public availible API that allows you to retrieve the current coordinates of satellites such as GPS and Galileo? I've only found ways to get Satellites Ephemeries and calculate the ...
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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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2answers
150 views

Automatic split a mosaic of satellite images into pieces

I have a mosaic of satellite images, but for the analysis, I need to define the boundaries of each part. Does anyone know how to do it in an automatic way? I need to get the red boundaries like on the ...
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360 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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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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960 views

Formula for maximum coverage of a geostationary satellite based on earth station elevation

I am trying to create a JavaScript function to represent the maximum coverage of a geo satellite for different antenna elevations (0 degrees, 5 and 10 degrees) with 3 leaflet polylines. The result is ...
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840 views

Decision tree classifying of satellite image in R?

I want to classify satellite image in R using RWeka classifier, J48. I have a CSV file with the classes required, and raster data loaded in R. I am able to make the tree, however, I am not able to use ...
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819 views

GLONASS Satellite Position Prediction using Almanac Data

GLONASS ICD has a section named "Algorithm of calculation of satellite motion parameters using almanac". It gives the formulas in order to calculate the position and velocity of the satellite. ...
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502 views

AGI STK Server alternative

AGI has a server product called STK Server that exposes REST services to perform satellite acquisition planning. However the cost is astronomical $200k+ (pun inteded). They also have STK components (...
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0answers
169 views

Projection string for GOES-WEST

Full-res, full-disk GOES-WEST images are available from goes.gsfc.nasa.gov. Is it possible to rig up a projection string for these images? We know the center pixel is at (0N, 135W) and the satellite ...
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0answers
71 views

Satellite looking angle calculation (non zero latitude for subsatellite point)

When calculating looking angles for geostationary satellites, it is assumed that because the satellites have an equitorial orbit, the latitude of the subsatellite point is 0. In reality, the latitude ...
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177 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)= [...
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2k views

Principal Component Analysis in QGIS

How do I go about to perform a band ratio and Principal Component analysis in QGIS? I need to derive principal components from ratios of landsat TM bands .
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17 views

Extracting or masking of very large raster to reduce file size on disk?

I have a very large 8-band raster (339806 x 61704) that I cannot load to memory to manipulate (R, raster:canProcessInMemory indicates I need 4999.16 GB of ram to load this file). However, I only need ...
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46 views

Google satellite xyz tile layer in QGIS has lower resolution than the basemap in Google Earth?

As far as I can tell, the Google satellite imagery loaded as an xyz tile in QGIS is the same image that is used in Google Earth, but at a lower resolution. The lower image below is from QGIS using the ...
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16 views

Calculating Satellite Azimuth from Landsat WRS data?

I found the below answer in regards to how one identifies the satellite azimuth from Landsat Images, but am not sure how you translate the path/row into azimuth angle. I have searched for such, but am ...
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28 views

Calculating satellite position in lat, lon given the position of receiver, altitude of satellite, azimuth and elevation angles

I want to calculate position of a satellite, given the position of the receiver, azimuth,elevation angles and height above ellipsoid for the satellite. I think this should be a simple geometry problem ...
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21 views

How to create coordinate system (using Lat/Long) across IR & VIS satellite images

A recent project of mine has been to gather IR and VIS data from WeatherUnderground's online site for the purposes of creating fun and informational temporal GIFs. Now, I'd like to take it a step ...
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44 views

Creating Workspace for Satellite Imagery in ArcGIS Pro?

I am trying create mosaic from Sentinel – 2 satellite data. To realize this task I’ve used “New Ortho Mapping Workspace” and “Satellite” Type. In next step I’ve chosen appropriate sensor type, the ...
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95 views

calculating HRMS using NMEA sentences including GPGGA , GPGSV, GLGSV, QZGSV,QZGSA, GPGSA?

I have NMEA sentences including GPGGA , GPGSV, GLGSV, QZGSV,QZGSA, GPGSA and GNGSA. my goal is to achieve HRMS accuracy meter. produced android devices for special intent gives GP/GN GST nmea message ...
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38 views

Using carto mobile iOS sdk download offline map having satellite map style instead of normal map style

Is there any way to use satellite map style for maps downloaded for offline usage using Carto Mobile SDK?
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25 views

Gravity map GOCE

I'm trying to produce a gravity map out of some GOCE (Gravity field and steady-state Ocean Circulation Explorer) data I downloaded from ESA's (European Space Agency) GOCE archive. I'm trying to follow ...
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20 views

Where can I find decent resolution (5m ish) night time orthophotography/satellite imagery data for Ireland?

Anything I've found so far has been incredibly granular. I need a resolution which is fine enough to see general lighting footprints for motorway junctions.
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58 views

Aligning multiple images with different spatial resolutions

I am using 2 different satellite images that have different spatial resolutions. One of them has 1 degree and other has 0.25 degree resolution. I want to subtract one image from another. So I should ...
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108 views

AOD measure from MODIS satellite images

I need to use the MODIS Terra images, in particular the daily data that contains information about Aerosol Optical Depth. What do i have to do is to obtain the value of AOD in some precise point(in my ...
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148 views

Changing raster display in QGIS to look same as ArcGIS Desktop?

I have a strange problem. I have noticed that the same satelite imagery looks totally different in QGIS and ArcGIS. The problem is that I need to get the same style in QGIS. I've tried to calculate ...
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108 views

How to check if area of interest has clouds in a sentinel scene

I am using python script to download sentinel 2 imagery. given area of interest and cloud condition, it's easy to download the scene. but I am more interested to know if there is some way to check ...
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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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568 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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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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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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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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553 views

Raster satellite images for QGIS

When I try to apply a downloaded GIS satellite (t=rimage to Quantum, it doesn't seem to open properly. There must be a step-by step description on how this would be done effectively. Can anyone tell ...
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19 views

Creating segmentation masks for high resolution images?

I have some very high resolution satellite 30cmx30cm images. I am trying to label some things in the images using polygons or masks. How do I go about creating segmentation masks for this images. ...
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20 views

Permissions are blank when trying to load satellite images from Planet API

I am trying to download the map of Melbourne using Planet API. I have given AOI coordinates of Melbourne. When I run the code the permissions are returning blank ("_permissions": []). I cannot able to ...
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2answers
45 views

ESRI Clarity vs Google Maps satellite images, distortion due to elevation?

I have a couple of satellite images, each about 1 km square, of the same rock climbing area. One is from ESRI Clarity, the other from Google Maps. The Clarity image is projected to UTM and has a UTM ...
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0answers
23 views

Projecting a satellite full-disc image?

I receive full-disc GOES-16 images wich look like this: I want to crop it and project it so it look like this: How can I do this? Ideally from a command line tool so I can automate the process.
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26 views

Downloading Aster level 1T product?

When I try to download Aster level 1T data from the USGS Earth Explorer site it asks me to enter my username and password over and over when I click on download link of my desired product. What ...
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1answer
37 views

Didn't show all the column while export the CSV file while using Google Earth Engine

I'm trying to calculate the water areas and the statistics of each band for each water areas to see if there are seasonal changes. The exported .csv file only have the columns ("GNIS_ID","AreaSqKm","...
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20 views

Higest-resolution daily temperature products?

I'm looking to collect daily temperatures for a very small geographic area, and as such am in need of some high-resolution products. I have used MODIS, but the data comes with a 1km resolution. Are ...
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0answers
45 views

Google Satellite Imagery

I am working with QGIS 3.4.3-Madeira. I am using XYZ Tiles to display Google's Satellite Imagery via a WMS link. Unfortunately there are limits to WIDTH and HEIGHT parameters so that when creating ...
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0answers
29 views

Open Pan Sharpened satellite images in Python?

I recently downloaded the SpaceNet Off Nadir dataset for work but found that the Pan-Sharpened images can't be opened in Python. I think it's probably due to the colour bands being undefined but I'm ...
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1answer
59 views

Get a list of all the images that match the conditions in Google Earth Engine (not only the first)?

Normally when I run this code I get the least cloudy image but I want to know what the other images are. I use this code: var image = ee.ImageCollection('COPERNICUS/S2') .filterBounds(...
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145 views

Is there an API for NOAA GOES 15 satellite data?

In August 2015, I was requesting GOES 15 GVAR_IMG satellite data because it had both visible and infrared light info (useful for studying cloud coverage and solar radiation). I remember having to ...
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128 views

Retrieve sentinel2 cloud mask through an API

Have you ever heard about an API to download sentinel2 cloud mask only ? Not all bands but just cloud mask. Because I just want to process a small part of each satellite tile and it's very time ...
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97 views

Removing “Bow-tie deletion line ” from my raster dataset

I am working on VIIRS SDR dataset where I have created geolocated and projected raster of "BrightnessTemperature" using "Latitude" and "Longitude" dataset given in HDF5 format using ENVI. Now my study ...
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94 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? ...
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0answers
17 views

Satellite image analysis using sentinel in python

I am trying to download the map of certain region using Sentinal. I am using "BANDS-S2-L1C" to authenticate. When i try running an algorithm to fetch the data of the region, it is throwing "Server ...
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0answers
9 views

High resolution RGB satellite images for different daytimes and seasons of the year

I am looking for high resolution RGB satellite images with the following requirements: Very high resolution: ~1m per pixel Coverage: Big cities in US and/or Europe Revisits during different daytimes (...
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1answer
61 views

Downloading satellite imagery from German cities (zoomlevel > 13)

I am looking for a way to download satellite imagery for later use with ml similar to this: I have to download quite a number of these images so downloading directly from Google Maps isn't really an ...