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Questions tagged [satellite]

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

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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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54 views

What is the minimum `metadata` specification for the Open Data Cube?

There is a standard metadata definition here, but I would like to create a new one, with only the absolutely required fields. What is the minimum set of values that can be used to define a metadata ...
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1answer
56 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 ...
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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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1answer
44 views

Adding Yandex Satellite map in OpeLayers

How can I add Yandex satellite map in OpenLayers? new ol.layer.Tile({ title: "Yandex Uydu", baseLayer: true, visible: true, source: new ol.source.XYZ({ url: 'http://vec0{1-4}.maps.yandex....
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1answer
41 views

Visualization of 11-bit images

I'm trying to visualize a 11-bit TIFF image using matplotlib. To do it, I load the image using tifffile to obtain a 3D numpy array. Next, I have to down-sample the image because the array contains ...
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2answers
426 views

How are satellite images mapped to terrain coordinates so precisely?

Many geoinformation systems have both satellite images and terrain features (houses, roads, etc) with coordinates. So they can show terrain features drawn over the satellite image or they can display ...
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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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1answer
43 views

How to Sample Locations from a Satellite Image

I am using the Near infrared and red bands from satellite images to research soil quality in southern Africa. The study site is about 20 km wide and 20 km long so almost square shape, and I am using 5 ...
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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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32 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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1answer
50 views

Soil Adjusted Vegetation Index Values (MSAVI2) are Not Within Expected Range

I am using MSAVI2 (Modified Soil Adjusted Vegetation Index 2) to analyze different land cover classes for a study area in southern Africa. The Land cover classes were taken from a Planet Labs ...
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1answer
26 views

What equivalent zoom level would ISS astronauts would be seeing the Earth?

Like for Google Maps, there are 20 zoom levels. What zoom level would approximately give us the view that astronauts have?
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1answer
33 views

Can't Add Mapbox hosted DigitalGlobe Basemap in QGIS 3.2

I'm having trouble viewing a Digital Globe base map in QGIS. I'm following Mapbox's instructions from their API https://mapsapidocs.digitalglobe.com/v2.0/docs/tiles (bottom section that describes ...
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19 views

How to find specific bearing, distance and elevation of a satellite [duplicate]

I am trying to find a specific bearing, distance and elevation to a satellite. I know there are websites but I need a formula to do this. I need to be able to find these things from a set of co-ords ...
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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
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How to move polygon fit to Google satellite in Qgis [closed]

I have a huge polygon layer of land areas and houses in a river delta. It does not really align with the images form Google satellite, so I tried moving the polygon layer. When I do so, it can't be ...
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1answer
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Is there a way to get georeferenced satellite tiles of any location on Earth? [closed]

I'm looking for a way to server or command line interface that a program can use to automatically generate a photorealistic satellite image of any portion of the Earth. It is critical that every such ...
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1answer
24 views

ArcGIS 10.5 - Testing the accuracy of a satellite image's georeferencing using dGPS ground control points

I want to test the accuracy of the georeferencing of a satellite image by using a set of independent ground control points collected in the field via differential GPS. Is there a tool/method/...
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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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1answer
92 views

FCC Galileo Waiver: What does it mean in practice? [closed]

Today the FCC approved the use of Galileo navigation satellites in the United States. According to gps.gov, The Federal Communications Commission (FCC) rules require licensing of non-federal ...
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2answers
54 views

How to get latest picture of my city from sentinel 2?

I was trying to get latest picture of my city from Sentinel 2, but had no success. I have registered on Copernicus website, found my city and drew a square around it. Then I clicked the "search" icon, ...
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1answer
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Comparing raster - pixel colors using PyQGIS? [closed]

I would like to compare satellite pictures (raster) infra - red. I have 2 rasters from the same area. I would like the compare pixels with the same xy coordinate using PyQGIS. 10 different values ...
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1answer
47 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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2answers
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What is the difference between Bing Maps, Here WeGo and Google Earth imagery in this area?

We are working on a project about the exploration of historical ruins via publicly available satellite imagery. This project is for a high school scientific research competition. In the photos below ...
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1answer
261 views

Seeking OpenStreetMap satellite images service beyond Google Maps service?

I have come back to a private QGIS project that I designed 3 months ago and I get a message from the Google Map Service like: For Deployment Purposes Only Are there attempts to provide satellite ...
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1answer
213 views

Why Landsat images are tilted/rotated?

When I browse images from https://earthexplorer.usgs.gov/, I can see that all of the images from Landsat are all tilted/rotated at a certain angle. Why are they rotated? And what's that for? Below ...
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1answer
63 views

Satellite image in ArcGIS darker than usual

This is one image from 2013 in some área. This is another image from 2014 in the same área, but darker. why? How can I display it like in 2013. Both are Landsat 8 images.
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3answers
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What are the sources for old (1998 or earlier) satellite or aerial photos of the (southern) Netherlands?

Our municipality says that our garden is too big, according too the cadastre. If we can prove the situation has been already there for twenty years, then they won't charge us for the extra space our ...
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2answers
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Is any map with calculated NDVI available online?

Is there any map which has NDVI calculated? Where can I get highest multispectral satellite image which could be zoom to very large extent?
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1answer
401 views

Python folium package for 'satellite' map

I am trying to have a zoomable satellite map for my Transportation network analysis. Other free maps all OK but could not get satellite to work. I am using: token = 'pk....
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1answer
136 views

Writing custom Prepare Scripts for Open Data Cube?

How do I write custom prepare scripts for the Open Data Cube format ? The docs say the following: We expect that many new Data Cube instances will require custom prepare scripts to be written. It ...
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1answer
68 views

Displaying hdf5 file at correct location?

I have downloaded the INSAT-K1 VHR INSOLATION PRODUCT (https://mosdac.gov.in/catalog/doi/36). This is satellite data in hdf5 format. When I display the raster in either ArcGIS or QGIS it appears at ...
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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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RTK GPS Surveying

My RTK GPS surveying setup uses two Topcon HiPer V antennas, running Pocket 3D on a FC-5000 tablet. Over the past year I have taken 274 shots on the water's edge (to get the lake level) and there have ...
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1answer
38 views

What is accurate GLONASS?

As I know, GPS gives accurate data for everyone. I've heard GLONASS have two types of data. High precision data available only for the Military. Low precision data for civilians. İs there an ...
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1answer
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How to download satellite image from planet.com using API key

I would like to know what to do (step by step in simple words) and how to get data from www.planet.com There is tutorial https://www.planet.com/docs/api-quickstart-examples/ but anyways I have ...
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Image navigation/geolocation of geostationary MTSAT HRIT?

I am wondering if anyone has had any experience with image navigation of MTSAT HRIT images? My current workflow is: create geostationary scanning angle co-ordinates re-project to 0.025 degree ...
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2answers
562 views

Determining if Sentinel-1 orbit is ascending or descending from absolute orbit number?

The file name convention for the Sentinel-1 mission is MMM_BB_TTTR_LFPP_YYYYMMDDTHHMMSS_YYYYMMDDTHHMMSS_OOOOOO_DDDDDD_CCCC, where MMM: mission identifier (S1A, S1B) BB: mode/beam (IE/EW/WV) TTT: ...
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1answer
185 views

Satellite data to position coordinates

Is there a step by step process to convert sets of raw satellite data to traditional GPS lat/long points or a website that takes the data and processes it? Example of the raw satellite data: $GPS30,...
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1answer
180 views

Extracting a polygon from slanted Sentinel satellite image using R

I have a Sentinel image, the coordinates of the boundary are given. I want to extract/subset a polygon from it. I am using R and don't have any prior experience in GIS. I have downloaded some ...
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2answers
108 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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1answer
107 views

Exporting 16bit tiff sattelite imagery with the stretch/colour-balance applied by Arcmap?

Problem: I have 16-bit satellite GeoTIFFs from DigitalGlobe (QuickBird/WV2), which I wish to share with a colleague that does not have access to GIS software. When loaded into ArcMap, these ...
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0answers
32 views

Water contamination assessment in SNAP using sentinel-2 images

I recently started using SNAP. I need help with assessment of the current water contamination crisis in Gdansk, Poland. On 15.05 the local sewage pumping station broke and started pumping sewage ...
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1answer
95 views

Multi-Spectral High Resolution Satellite images for flood events

I'm searching for multi-spectral high resolution satellite images for flood events. I found a database of flood events from this link with dates and approxiamte locations (polygons) and I used the ...
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2answers
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Performing nighttime light intercalibration of DMSP/OLS in GRASS GIS?

I have 1 nightlight image of DMSP/OLS. It is uncalibrated. I want to calibrate the image based on Wu's (2013) methodology. Every time I try to run the command "i.nightlights.intercalibration" on GRASS ...
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1answer
62 views

R does not load coordinate reference when importing a multiband tif raster from Triplesat satellite

I'm trying to read Triplesat imagery into R. However there seems to be a problem with the coordinate reference in the .tif file as the crs, extent and resolution are not loaded. I tried two ways of ...
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1answer
29 views

Difference in Bit-depth in Satellite Images

I have DMSP/OLS and VIIRS satellite images. For the 1st image the bit depth is 8, for the 2nd image is 32. I want to make intercalibration between those images. Will it cause a problem due to ...
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0answers
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Calibrating satellite images using observed points?

I was considering using cokriging in blending observed points with satellite images but this answer to Performing Cokriging in R? and the comments there urged me not proceed with cokriging. How can ...
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113 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 ...