Collecting and interpreting information about the environment and the surface of the earth from a distance, primarily by sensing radiation that is naturally emitted or reflected by the earth's surface or from the atmosphere, or by sensing signals transmitted from a device and reflected back to it.

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2answers
36 views

Missing Dependency in SAGA. Orfeo Toolbox does not work

Hej guys, I am trying to perforem segmentation from Orfeo Toolbox (QGIS last version 2.2), whenever I try to use the toolbox, I get the following message: Oooops! The following output layers could ...
3
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1answer
54 views

Applying pixel reliability mask to time series MOD13Q1

I am working with a 23-band GEOTiff in which each band is a 16-day MVC MODIS NDVI image. The MODIS .hdfs include a "pixel reliability" image with the following values: [-1]: Fill/No Data-Not ...
3
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1answer
45 views

How can I display GeoEye1 imagery in colour in Opticks?

Anyone familiar with the use of the open-source remote sensing software Opticks? Im new to opticks, I load GeoEye1 imagery but it displayed as greyscale. It supposed to be displayed as bands ...
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1answer
41 views

Finding Normal to a given point in ECEF coordinates

I have a point of reference called Ground Reference Point (GRP) given in Earth Centred Earth Fixed (ECEF) coordinates as given below: (1.4892e+6, 6.1102e+6, 1.0637e+6) (all distances in meters) I ...
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1answer
98 views

Using Mosaicking Images in Erdas software

Do you know any dissertation which has written about Mosaic briefly? I did the Mosaic for my Landsat images but i want to explain and write about but i do not know how and what shall i write about it ...
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0answers
77 views

Using Quickbird to discriminate vegetation response and spectral signatures - which season?

I have a study area in N. Florida loblolly pine plantation with 3 treatments (drought, fertilization, drought+fertilization, control) and 4 replicate plots. All plots will be in the same scene. These ...
3
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0answers
151 views

How to merge SeaWiFS and MODIS data or use other merged products?

I hope to produce a time-series for sea surface temperature (SST) and chlorophyll-a (Chl-a) for use in MaxEnt without the use of arcgis, preferring Python tools to others. I am new to satellite data ...
2
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0answers
32 views

differentiating stone houses from barren rock in ArcGIS 9.3

I'm working in ArcGIS 9.3 trying to differentiate stone houses (often red brick roofs) from barren rock in a typical Mediterranean karst region via remote sensing. I have been using Landsat imagery. I ...
2
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0answers
28 views

“Back calculating” to quantify the “atmospheric effect” of water vapor or other gases in a “corrected” hyperspectral image using QUAC?

I know that when using FLAASH in ENVI, you can produce a water vapor map (caveats considered) from your atmospheric correction. My question is if it is possible to "back-calculate" a water vapor map ...
2
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0answers
105 views

ENVISAT ASAR .N1 file is not being opened by ERDAS IMAGINE 2011

I am not able to open ENVISAT ASAR .N1 file in ERDAS IMAGINE 2011. The software has direct read option for files of this format. Whenever I try to open the file, software closes automatically giving ...
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0answers
263 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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0answers
28 views

How to select MODIS pixels with 80% homogeneous landcover from landsat classification?

I have a complex landcover classification for a landsat scene at 30m spatial resolution. Includes about 600 land cover classes. There is a fair amount of clumping per group. I have a MODIS EVI 16 day ...
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0answers
39 views

How to perform image classification with SemiAutomaticClassificationPlugin and BIP files?

I have multiband satellite images BIP format, Landsat TM/ETM containing 7/8 bands respectively along with a separate header file, some of them corrected by nearest neighbour classifier. I'm working ...
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0answers
34 views

Importing GPS coordinates to extract multiple DN values in ERDAS

I have a set of GPS points (stored as a csv for now) and would like to import these points to ERDAS to find the DN values associated with each location. I am able to import a SHP to ERDAS but the ...
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0answers
196 views

Question related with NDVI value on water

There is a surreal thing on my NDVI images. NDVI values on lake is ranging from -0.04 to 0.7. (The lake surrounded by forest and has freshwater). Theoretically, negative value of NDVI is correspond to ...
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0answers
72 views

How to convert MODIS (Vegetation Continuous Fields - MOD44B) to (.img and hdr) in ENVI

Please can anyone help me to convert MODIS (Vegetation Continuous Fields) to (.img and hdr) formats? In ENVI, anytime i try using the MODIS conversion toolkit, a dialog box appears telling me to ...
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0answers
152 views

How to mask clouds in ER Mapper?

I am using ER Mapper. But, I'm still confused how to detect and mask the clouds. I want to reduce or eliminate the cloud to perform supervised and unsupervised classification.
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0answers
123 views

Averaging satellite data with missing values (using Python)

I am using sea surface temperature, chlorophyll, and other data parameters as covariants in a model, and I would like to average them over a particular time period. I am currently doing this using a ...
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0answers
22 views

Masked data included in ISODATA classification computations?

I am using ENVI to mask NDVI MOD13Q1 images using the "pixel_reliability" raster included in the MOD13Q1 hdf. All instances of cloud cover (pixel_reliability=3) have been masked (=0). I have applied ...
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0answers
134 views

Top-of-atmosphere reflectance conversion with WorldView-2 images

I recently received a set of radiometrically-corrected dynamic range adjusted 8-byte WorldView-2 images. I want to convert to top-of-atmosphere reflectance and would like to use the FLAASH in ENVI 4.8 ...
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0answers
104 views

Atmospheric correction for RapideEye without atmospheric parameters

I'd like to perform an atmospheric correction of my RapidEye images but metadata do no include atmospheric parameters required to use the 6s algo implemented in the Orfeo ToolBox. Is there a solution ...
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0answers
80 views

How to get NDVI data that since 2006

I want to download NOAA NDVI data that since 2006. What source is possible to download? I have ndvi that MODIS 250 m and 16 day (2000-2013), SPOT NDVI 1 km and 10 day (2002-2013) and NOAA NDVI 8km and ...
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0answers
41 views

patch analysis and spatial statistics for Grid data

I have TerraSAR data (raster data) for settlement, I must show the large density building, medium and low density in the map. Is this possible in the spatial analysis or patch analysis? I look ...