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1answer
40 views

Image classification using google satellite images

Currently our expert user classifies locations by viewing the Google earth satellite image of a location. They consider circular areas of a 5km radius at a set zoom level. They evaluate the image for ...
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19 views

How to estimate the area of rooftops of buildings after detection?

Presently, i need to find out the area.I have made an gui in which i change thresholds and find out the rooftops as white portion. I have identified the rooftops which are the white regions in the ...
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1answer
68 views

Reading zipped ESRI BIL files with Python

I asked the question below on StackOverflow, but haven't received any feedback there yet: I have precipitation data from the PRISM Climate Group which are now offered in .bil format (ESRI BIL, I ...
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0answers
70 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
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1answer
144 views

Failed to create signature file

I need some help, because I've no clue how solve this issue the exercise that I'm trying to perform. The point where I'm stuck is 4. "Create signature file as LandsatCompS.sgs". I've done what it ...
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0answers
49 views

header information is missing from image, after writing using opencv

I am doing complement of an image using open-cv python, while writing the image, open-cv is not writing the header information in the complemented image. my image data are in TIFF format. i am doing ...
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0answers
19 views

i.atcorr empty raster

I am recent GRASS GIS user who is trying to run the i.atcorr module to atmospherically correct a Landsat ETM+ image in GRASS 7 (on MacBook Pro, Mavericks OSX). This image has been already converted to ...
3
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1answer
47 views

Sample classification datasets?

I was looking for some publicly available ground data classification datasets, specifically, locations in e.g. latitude/longitude with a description of the land cover/land use, and a reference e.g. ...
2
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1answer
200 views

How to extract vegetation polygons from Imagery using Python?

I have been trying to roughly polygonize vegetation areas from Imagery (RGB). I tried using Iso Cluster Unsupervised Classification (Spatial Analyst) but it is still too detailed for my purpose. I ...
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0answers
139 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
70 views

How to convert decision tree to ruleset in eCognition?

I have created a decision tree which created using decision tree tool in ENVI to classify 10 land cover types. Now I want to convert it to a ruleset in eCognition. How can I convert it? Thank you ...
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2answers
214 views

Gdal: How iterate through all pixels of a raster image?

Given a topographic raster image. How to iterate through all pixels of this raster image ? Solution preferably with gdal, in console. Some other libraries/script could be installed. Related: ...
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0answers
235 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
252 views

Why does ArcGIS Resample tool change cell size and numbers of columns and rows?

I am working with images of oxygen distribution within individual plant root systems submerged in water. The program I use to acquire these images, LookatRGB, splits the green band in half and makes ...
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0answers
92 views

How can you calculate mean value per segment in Idrisi?

I have a segmented image and the original NIR/R/G bands in Idrisi Selva. I would like to calculate the mean NDVI per segment in Idrisi. There are so many tools, I'm not sure which would do the trick. ...
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0answers
240 views

Novel ways of filling in missing values in a raster

I am looking for robust ways to fill in missing values in some rasters. They all have a single layer. Missing values consist of single pixels to medium sized patches. Rasters are around 1000 x 1000 ...
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0answers
307 views

Enhanced vegetation index using ENVI 4.7 bandmath

I computed Enhanced Vegetation Index using band math in ENVI 4.7 software. The expression used was: 2.5*((float(b1)- float(b2))/(float(b1)+ (6*float(b2)) +(7.5* float(b3)))) BYTSCL(float(b1), min = ...
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1answer
84 views

Find the vertices of an ROI in XROI using IDL

I need to find the vertices of an ROI shape created in IDL's XROI, so that I can redraw the ROI on multiple images. I know you can find the centroid, area and perimeter with the GEOMETRY command, but ...
3
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1answer
279 views

Atmospheric Calibration for Landsat 7 ETM+ Gap Filling

This is for thesis work involving mapping of above-ground mangrove forest biomass using Landsat 7 ETM+ imagery. I am assessing correlations between biomass with vegetative indices, e.g. NDVI, and ...
3
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1answer
257 views

Questions regarding the processing of mosaic Landsat 8

Approximate Translation of Original Question: A question of theoretical and practical about the mosaic of satellite images. I have 3 different months of Landsat images, which need to accomplish the ...
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0answers
132 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
171 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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2answers
434 views

How to specify the pixel depth in model builder?

I have a simple model that calculates the NDVI from bands 3 and 4 of a raster dataset. The input bands are 8-bit unsigned, whereas the default output NDVI is signed 32 bit. How can I specify the ...
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2answers
1k views

How to determine soil moisture index values from reflectance values in a satellite image?

I'm working on determination of soil moisture by remote sensing. I would like to know how we can determine soil moisture index values from reflectance values in LANDSAT TM images.
2
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2answers
291 views

How to manually reclassify a contiguous region of misclassified pixels?

The attached image is the result of an image segmentation algorithm on high resolution imagery. The smaller clusters of pixels represent trees and brush and the larger cluster of pixels (marked with ...