Questions tagged [satellite]

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

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33
votes
8answers
24k views

Creating shapefile showing footprints of Rasters?

I have around 1,000 satellite images in tiff format, and I want to create a shapefile which will serve as an index to the rasters. This is something similar to a raster catalog, but I do not want to ...
6
votes
2answers
2k views

Identify the latitudinal and longitudinal point directly beneath an object in space

Given the azimuth and altitude / latitude and longitude from the observer to the satellite, how can I accurately find the latitude and longitude of the point of intersection directly under the ...
1
vote
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 ...
5
votes
2answers
822 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 ...
1
vote
2answers
174 views

Seeking downloadable images for night?

Where can I download freely available images for night from for South Asian region? ?
9
votes
5answers
25k views

Free radar (SAR) satellite data [closed]

I'm looking for free (non-commercial use) sources of radar (SAR) satellite imagery. Does anyone know of sources?
17
votes
7answers
5k views

Seeking Satellite Imagery Providers? [closed]

I'm building a web application - my requirements are: Must have global satellite imagery. Must have easy to use API's that are capable of geoJSON data imports, mouse and keyboard gestures, etc. To ...
12
votes
1answer
2k views

Automating roof orientation detection from satellite imagery?

A while ago I did a neighbourhood roof orientation survey for solar panel deployment, by visually checking each roof and marking individually whether they were south or almost south-facing. As this ...
12
votes
2answers
43k views

Identifying image location?

I have a satellite image of only one part of some city with a lot of vegetation. I need to find out where is that image taken. Is there any way to find out where it is taken on Google Maps, Google ...
6
votes
2answers
5k views

GPS Module Without Velocity or Altitude Limitations

I am looking for a GPS module that I can use in a high-altitude project. The problem I have discovered is that GPS manufacturers are required to place a set of restrictions on GPS modules. The ...
5
votes
2answers
5k views

Is there an industry-standard official mapping of GLONASS satellites to “PRN” values?

In the U.S. GPS system, satellites are uniquely identified by the PRN number broadcast by each satellite. This ID is usually visible on most GPS receiver platforms that provide access to individual ...
4
votes
3answers
3k 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 ...
3
votes
1answer
5k views

How do I clip/mask a satellite photo to a polygon?

Given a shapefile composed of contiguous polygons, I'd like to clip (or mask) regions of satellite photo to the polygon outlines, and export each resulting raster in medium resolution for further ...
7
votes
1answer
660 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 ...
2
votes
1answer
99 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 ...
2
votes
1answer
264 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 ...
3
votes
2answers
2k views

Where can I find non-rectified stereo satellite imagery?

I'm looking for free (as in beer and as in commercial-use-friendly freedom) sources of stereo satellite imagery. I assume that such imagery should not be rectified since that would remove the benefits ...
2
votes
1answer
174 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 ...
1
vote
1answer
176 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: ...
1
vote
1answer
760 views

Win7 GRASS 7 & i.landsat.toar

Hello has anyone got experience running i.landsat.toar ? The output files I get are empty, the command takes but a moment to complete. However when run in verbose mode all the calculations are done, ...