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

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10 views

Help understanding MODIS coverage?

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
21 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
32 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 ...
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0answers
12 views

lambertian - non lambertian methods

There is enough literature on the topographic correction of satellite images, but in what cases the non Lambertian methods are preferred (over Lampertian)? do we determine the appropriate method only ...
2
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1answer
18 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 ...
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0answers
24 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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0answers
162 views

Which remote sensing satellite is best used 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).
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0answers
78 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
27 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!
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1answer
12 views

Use of OTB BandmathX

I have a couple of three-band satellite images that I want to apply an expression to and get a three-band output. The expression is of a simple form: output_pixel= (input_pixel*d^2)/cos e After ...
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0answers
20 views

Multiple Satellite Swatch processing for 1 years worth of data

I have a file of several scans per day for one year. I am using the OMINO2 product from the Aura platform. I am tasked with creating an automated process to: 1) Extract the sub-data set within the ...
1
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1answer
120 views

view zenith angle and view azimuth angle with Quickbird

I am trying to do an atmospheric correction on a Quickbird scene. I am creating a user-defined geometry which requires six parameters. The six parameters are solar zenith angle, solar azimuth angle, ...
0
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0answers
90 views

Erdas Imagine/LPS RPC orthorectification

When creating orthos in Erdas imagine or LPS from geoeye-1 (or other) satellite images having _rpc.txt files, which are referenced in WGS84 generally, what should be the projection of the used DEM? If ...
1
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1answer
47 views

how to generate metadata file for semi automatic classification plug in?

I am working on satellite images. The region I am interested in is only a fraction of the whole satellite images. My laptop slows down tremendously when working on the whole image. So I clipped the ...
1
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1answer
58 views

Is it possible to make satellite imagery viewable through a marker?

I am working on the project using Mapbox.js and jQuery and the client has asked for something that I'm not sure is possible. A screenshot of what I currently have is below. The client wants the ...
0
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0answers
47 views

How much does relatively up-to-date 1 meter resolution color satellite imagery cost?

I'm starting to realize that I'll probably have to pay for good satellite imagery, and the sites I've been to so far want me to call them to ask for price quotes. I'm wary of this and haven't done it ...
3
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2answers
204 views

High resolution satellite

Can any one tell me from where I can buy commercial High resolution Satellite images for Biodiversity research ? I need some websites that sells these kind of images ?
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0answers
34 views

Satellite data between 1975-1985 in Brazil?

So I've been looking for satellite imagery to use for a project without any luck. I need images between 1975 and 1985 near the Roosevelt river in Brazil, from any satellite at any spatial/spectral ...
3
votes
1answer
106 views

It is possible to verify landsat reflectance values?

My question is really wide today, as I am still beginner in Remote sensing. I´ve asked a GRASS programmer to prepare for me Landsat reflectance values from raw DN values (1 scene per year from 1987 to ...
1
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1answer
46 views

Disconnected Satellite map tiles usable with OpenLayers or other javascript api

I'm looking for satellite map, usable with OpenLayer (or with an other js api), with a good scale (at least 100m, MapQuest stops at 1000m) and avaible for a disconnected mode (avaible for download). ...
2
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0answers
55 views

Is it possible to get coordinates for point from satellite image? [closed]

Is it possible to get coordination for point from satellite image using any programming language? For example, if I clicked on a specific point on a satellite image hosted on a web application, I ...
0
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2answers
41 views

MODIS product MCD43A3 stating 16 periodicity but when downloadad I have files every 8 days

I'm downloading the MODIS derived Albedo 16-Day L3 Global 500 m resolution product. I expected to have a dataset for dates every 16 days. Instead I have datasets every 8 days as can be seen in the ...
3
votes
1answer
458 views

I am looking for an alternative solution to openlayers for satellite imagery in QGIS? [closed]

Does anyone have any other suggestions for sources of satellite imagery on QGIS? Openlayers is becoming extremely temperamental in QGIS 2.6 (Google imagery not bothering to work anymore, Can't zoom in ...
0
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1answer
50 views

Satellites to retrieve UV bands

I want to retrieve some satellite images with UV bands,Bun I don't know which satellites are providing UV bands and We can freely download them? I have already downloaded Modis and Landsat images,But ...
0
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0answers
110 views

Extract Aerial Imagery using QGIS

I need to create city-wide (Warsaw in this case) aerial based map, pretty detailed (clearly visible buildings and possibly 1-pixel-sized cars. So far the only way I found is: Using this method: ...
3
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0answers
206 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 ...
4
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4answers
2k views

Free radar (SAR) satellite data

I'm looking for free (non-commercial use) sources of radar (SAR) satellite imagery. Does anyone know of sources?
1
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0answers
62 views

Calculating new satellite position given pseudorange measurements

I'm looking for a reference/text for an explicit formula to calculate a satellite position given pseudorange measurements from later epoch times. I've seen a lot of matlab code on the internet but I ...
2
votes
1answer
161 views

Computing the elevation angle of a GPS satellite with respect to the given receiver location

can anyone source an explicit formula for calculating the elevation angle for a GPS satellite as seen from a receiver. I can't seem to find one. Even a text reference would be great. I couldn't quite ...
0
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0answers
21 views

Aerial imagery not loading in GeoServer deployed under JBoss

I published a satellite image of a small town in GeoServer using image mosaic plugin. In Tomcat the layer preview is coming without any issue but when i try to do the same in Jboss the layer preview ...
2
votes
1answer
80 views

My RapidEye image won't appear in GRASS GIS

I have several RapidEye images that I want to use for object segmentation in GRASS GIS. When I import the the bands they all look like this and the same goes with a RGB composite: I've used these ...
2
votes
1answer
341 views

Free Web-service providing Satellite Images

Is there any web-service currently available which is hosting satellite images as open-source, just like OSM web-service hosting vector maps? We want to make a real-time traffic monitoring commercial ...
1
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1answer
63 views

Easy Guide to ESA satellite data?

Can anybody provide user friendly guidance to ESA datasets? What is available? When will new stuff be available? I struggle to work out what might be interesting amongst the many websites and their ...
3
votes
1answer
219 views

Dark Object Subtraction QGIS

I'm trying to do Dark Object Subtraction (DOS) for a Spot2 and 4. I have calculated the TOA reflectance and now want to get the at surface reflectance. Using QGIS I would like to know how I can do ...
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1answer
65 views

Most suited Remote Sensing [closed]

What will be the most suited remote sensing data to use for mapping highways in North America?
2
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1answer
152 views

Merging h5 files from VIIRS to gtiff

I am trying to mosaic all the data from VIIRS of a day into a single gtiff. I've already done it with MODIS data using GDAL. The problem it seems is that the coordinates of each h5 files doesn't seem ...
4
votes
3answers
139 views

Colour matching satellite imagery from different time periods

Is it possible to colour match two separate satellite images taken at two different times? I am working with two high resolution, multispectral images that were taken approximately one year apart and ...
2
votes
1answer
58 views

What is the Scan Direction of a satelite image?

There are two possible values that I am aware of for describing the scan Direction of a satellite capture: Forward Reverse What is the meaning of Forward and Reverse scan direction? What are ...
5
votes
4answers
401 views

What satellite imagery would help to show spring locations?

I've got lots of tiny streams on a hydrography shapefile. Historic texts indicate that certain ones have headwaters at "sources" or springs, and I want to try to find these. Browsing the historical ...
1
vote
1answer
85 views

Can we manually select which satellites to use in solution? [closed]

For example, I have used below satellites ID in current solution: ID Signal Strength ______________________ 1 21 22 23 19 12 36 26 20 18 3 29 32 ...
0
votes
1answer
284 views

how to mosaic rasters in grass gis?

I am new user of GRASS GIS. I need to know how can i mosaic different satellite imageries using GRASS GUI? I was trying to use i.image.mosaic, but could not succeed. I have been looking for online ...
2
votes
0answers
215 views

Decision tree classification 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 ...
2
votes
1answer
76 views

Imagery on March 6, 2014 @ Lat 42dd55'22“ N, Long 079dd37'36” W

I am looking for any advice where to find imagery on March 6, 2014 (or a few days following) for: I have searched the USGS, ImageHunter, and Digital Globe with no luck. Does anyone have a resource ...
3
votes
1answer
198 views

Calculate ground nadir line from PV coordinates

I'm using an API which returns a satellite's PVCoordinates (Position/Velocity pairs). {P(1036869.5330731269, 6546536.584960848, 9.892293545390519E-11), V(-9994.355195123433, 1582.9503539842497, ...
1
vote
1answer
587 views

Projection to use with satellite image from Google Maps / Earth

I'm very new to anything concerning GIS so please forgive me if this question has been asked before, but I assure you, I've been trying to find an answer for quite some time now. Of course it is ...
2
votes
1answer
368 views

Is there any information in Sky Plot that is not in DOPs chart in terms of predicting accuracy in the field? (GPS data collection planning)

Joe only looks at DOPs chart and weather report for mission planning. Moe looks at both DOPs chart and Sky Plot and weather report. Is Joe missing out on something relative to Moe in terms of ...
1
vote
1answer
308 views

Convert measurement geometry from ground reference frame to satellite reference frame

I need to convert solar_zenith_angle, solar_azimuth_angle, platform_zenith_angle, and platform_azimuth_angle from a reference frame at the WGS84 surface to a reference frame at the satellite observer, ...
0
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1answer
55 views

Raster vertical pixel offset (ALOS AVNIR)

I am working with ALOS AVNIR-2 level 1a. There is a vertical offset/shift of each and every pixel column. It gives sort of a stripy appearance when zooming in. Does anyone have experience with this ...
2
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1answer
55 views

Need information about the Envisat satellite

I am new to remote sensing and I want to know about sensor design of Envisat satellite. Can anybody help me or preferably direct me to some good references?
2
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0answers
313 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. ...