Questions tagged [digital-image-processing]

The field of raster image processing

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0
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1answer
102 views

I can apply tasseled Cap transformation in surface reflectance (not ToA)?

I can not understand if I should adjust the Tasseled Cap index with the surface reflectance values or the Top of Atmosphere
3
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0answers
76 views

Processing drone Images of body of water?

I took some pictures of a body of a body of water using a multi-spectral sensor attached to drone. When trying to process the image using Pix4D, more than 50% of pictures were unable to calibrated. ...
1
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0answers
21 views

ArcGIS imagery analysis difference raster errors

I have two DEM rasters from the USGS NED dataset. One is from 2013 and one is from 2017, the extents should, and appear to, be 100% identical. I ran the difference function on the ArcGIS Imagery ...
3
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1answer
234 views

ArcMap Image Analysis Window - functionality is grayed out

In ArcMap's Image Analysis Window, none of the tools are available even though I have a raster selected in the window. I do not have Editor turned on. I can't identify why the Processing tools are ...
0
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1answer
126 views

Is there any comprehensive book or online instruction on image segmentation techniques? [closed]

I'm looking for a source to learn theoretical basis of image segmentation techniques thoroughly. The desirable book, or other kinds of source you may know, should cover the techniques that are more ...
2
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1answer
72 views

Aerial picture - how can I extract water drainages on a crop (to vectorize them)

I have a RGB aerial picture of an agricultural crop. The drainages (hundreds of them) can be barely seen because they a very slightly greener then the surrounding crop area (picture is from April). ...
1
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1answer
142 views

Atmospheric correction of Landsat 7 slc-off images

I am interested in finding the change in land cover particularly forests. I am working with slc-off images (no other sensor images available for my study). I have done the gap-filling in Erdas Imagine ...
1
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1answer
588 views

eCognition TTA Mask : Aerial images in ecognition for supervised classification

I am using eCognition Developer Trial 8.0. I have rgb Drone Otho foto. We want to classify this image for various biotope types exist in that region. We have already an existing classification as a ...
2
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1answer
116 views

Is image registration necessary among temporal Landsat images?

I am working on a project comparing each pixel every 4 years for the same AOI from Landsat Images (1986-2017). It involves with Landsat 5, 7 and 8 images. Do I need to perform image registration as ...
1
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1answer
626 views

How to aggregate/resample a higher resolution image to coarser resolution using defined threshold?

I've got a 30 m classification image and i'd like to convert it to 500 m resolution using a user-defined threshold value. Basically what i'd like to accomplish is similar to using the Resample tool ...
2
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2answers
137 views

Why such a large difference between overlapping LiDAR DEM values?

Background: Using Arc Desktop 10.5.1, I have been tasked with mosaicking two adjacent LiDAR rasters (I'll call them A and B). They were flown, processed and supplied under contract by different ...
0
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1answer
299 views

Preparing an integrated band depth image

How do i prepare an integrated band depth image? If i have to prepare an 1 micrometer integrated band depth image (sum of 0.79 and 1.3 band depth micrometer bands), do i just average all bands from ...
8
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1answer
2k 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 ...
2
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0answers
555 views

Remote sensing Classification and texture analysis compared with QGIS zonal statistics

I am Using Geomatica to analyse suburban spectral signature in Las Vegas. Ran a texture analysis on all band images. Combined texture bands with original image bands to run an unsupervised ISODATA ...
0
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1answer
1k views

How to find out Actual coordinate(pixel values) of chunk relative to the actual image?

I have an image of let say 500 X 500 px, I created tiles/chunks of size (10, 10). Now I want to find out actual chunk coordinate relative to the Original 500X500 px image. Ex I have first chunk of ...
1
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2answers
665 views

Calculate NDVI image from R and NIR channels and rescale it to 0-255

I have images of plants taken in Red(R) and Near End Infrared(NIR) field, I calculate the NDVI image per pixel using the below formula, NDVI = (R-NIR)/(R+NIR) , for all pixels, I get a range ...
1
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2answers
1k 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 ? =============================================...
4
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0answers
119 views

Appropriate resolution of images for image classification? [duplicate]

I am attempting to perform image classification on some maps that I have in PNG format. This classification is failing due to there being too many many pixels in the training samples (I appear to be ...
1
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1answer
168 views

comparison of atmospheric 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 dark object subtraction (DOS) is a method for doing ...
1
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1answer
416 views

R: Display single band raster in true color

I have a static image of a Bing maps tile (Mercator EPSG: 3857) with satellite overlay in PNG format. I read the PNG as a raster and georeferenced it in R by setting the corner coordinates using the ...
4
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1answer
356 views

Which preprocessing comes first for pansharpened imagery- atmospheric correction or orthorectification?

For pansharpened imagery, what preprocessing method to do first- is it atmospheric correction or orthorectification? From my readings, it seems the former but the rational polynomial coefficients or ...
1
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3answers
1k views

How to use rsgislib python binds in windows environment

I am right now would like to use rsgislib to create a simplify remote sensing image processing application based on python. However I have no idea about how to use rsgislib in windows. Perhaps ...
1
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0answers
162 views

How to add metadata such as geokeydirectory, geoasciiparams, modelpixelscale and modeltiepoint to a compressed tiff image?

I have resized my original tiff file (1.5gb) to a tiff file (170mb). But there was no geo reference points in the resized image which was present in my original tiff file. I have attached the ...
1
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1answer
367 views

Wrong extent when importing geotiff into R

I am trying to import a geotiff of 8-band satellite imagery into R using raster. g <- raster('16SEP22191919-M1BS-057310833010_01_P001.tif' ) When I call the object it displays the extent as the ...
2
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2answers
1k views

Mosaic Imagery using GDAL Edited

I have a couple of large sets of imagery I need to mosaic using GDAL. The sets are currently in tiff format with 18 tiles totaling about 20gb in size. I have attempted to mosaic using both the ...
0
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1answer
53 views

Seeking software to pick up rectangular shape of basketball courts?

Is there any software/plugins for remote sensing or object orientated classification for my 3 band aerial image? I want the program to be able to pick up open air basketball courts or badminton courts ...
2
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2answers
1k views

Creating visually standardized RGB images from Sentinel-2 data

I want to create "visually appealing" RGB images from Sentinel-2 L1C data in a standardized manner. Obviously, this starts with extracting the bands 4, 3, and 2, which correspond to the Red, Green, ...
2
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1answer
279 views

Channel swap when reading created image with Gdal

I use a function on python (3.5) to create GTIFF with GDAL: def array2raster2(fname, matriz, geot, proj): drv = gdal.GetDriverByName("GTiff") dst_ds = drv.Create(fname, matriz.shape[1], ...
0
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2answers
2k views

Tasseled Cap Transformation coefficient and Bias Value

I want to perform Tasseled Cap transformation of Landsat 5,7 and Landsat 8 data manually in ArcGIS. Please let me know where from I can get the coefficient values and Bias values for the following ...
0
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1answer
64 views

Mosaicking two mosaics in ArcMap

I am trying to mosaic together two smaller mosaics with two Landsat scenes each in ArcMap 10.2 but have come across an issue. As background, I am mosaicking the scenes this way since each of the ...
3
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1answer
126 views

Is preproccessing a Landsat scene necessary for image classification?

I am classifying Landsat TM scenes for the entire Chesapeake Bay as part of my Master's research. Scenes have been collected from 1986 to 2016 in 5 year increments for my area of interest. I recently ...
1
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0answers
611 views

SAR processing in R? [closed]

Anyone know if a package for processing SAR data in R exists? Such as doing calibration, terrain correction, classification on e.g. Sentinel 1 data?
2
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1answer
51 views

GRASS m.nviz.image render artifacts

I'm trying to render images of a dome lit from multiple angles in GRASS using the m.nviz.image render plugin. Whilst the DEM displays nicely in the map display, I'm getting weird fractal patterns ...
2
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2answers
383 views

Missing Landsat TM scenes for the year 2005?

I have searched Landsat TM images (path/row 149/37) for the year 2005 (1st Jan to 31 December 2005) on Glovis, Earth Explorer, Landsat Look and University of Maryland archive to work with. However, no ...
2
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1answer
106 views

Using satellite images for manual delineation - is pre-processing required?

I'm new to using satellite images. I'm using Landsat images from USGS (Level 1 data), so terrain-corrected. I want to manually delineate different forest classes using false color composites. Do ...
1
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1answer
468 views

Pixel value of Sentinel 2A L1C download

As I can read in many posts, it is necessary to convert Sentinel 2 L1C pixel values from Digital Count to TOA reflectance by dividing with the scaling factor. However when I open my image in SNAP, ...
2
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1answer
2k views

Filter Image Collection by Multiple WRS Path/Rows in Google Earth Engine?

How can I filter an image collection in Google Earth Engine by multiple WRS paths/rows? This is an example of a filter using one path.row: var sr2011 = ee.ImageCollection('LANDSAT/LT5_SR') ....
0
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1answer
704 views

Satellite image stretch with python: skimage, numpy

I am trying to perform a simple contrast stretch with python skimage on the image opened with gdal as array of type float32. I first calculate the percentile with: p2, p98 = np.percentile(arrayF, (P1,...
0
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0answers
55 views

Adjusting Spatial Accuracy of Ortho Imagery in ArcGIS Desktop?

I have about 35 square miles of orthorectified, high resolution, aerial imagery that is broken down into 620 individual tiff files. I have created a mosaic dataset of the imagery and I am working ...
16
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2answers
805 views

completing satellite imagery tiles when data coverage is less than 100%

I want to join several images (>=2) into one "best" image. Best is defined on low cloud cover and high data coverage. An example using free Sentinel satelite data follows. See http://sentinel-s2-...
2
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2answers
563 views

Nearest Neighbour Classification in eCognition

I have a few papers and youtube videos explaining how to conduct the NN classification in eCognition but it isnt giving me any output. I think the confusion is arising when trying to define the ...
5
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2answers
456 views

Calibrating Landsat Level-1 Precision and Terrain (L1TP) corrected data?

My study will involve Landsat OLI, ETM+ and TM scenes for forest biomass change assessment (Time Series Analysis) using different vegetation indices and textures. According to the official site https:/...
-1
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1answer
398 views

Find maximum of large (size) multiple rasters

I have several large rasters (300MB - 1GB), each raster has been reclassified with numpy array and GDAL blocks. I now need to create an output file with only the maximum value per pixel used in the ...
1
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1answer
248 views

How to convert NoData values to other values for raster data?

I have a NDVI map from MODIS data for my AOI. When classified, i noticed that few of the pixels appear in " white" color and show no value. How do i classify these pixels and attache an appropriate / ...
3
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1answer
297 views

Determining the best month for discriminating between different vegetation types?

I ordered and downloaded several (Surface Reflectance) Landsat 5-8 images from USGS Earth Explorer with the purpose of choosing a few of them to calculate some Vegetation Indices for each (NDVI, SAVI, ...
0
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1answer
85 views

Classifying concrete material through greyscale in ArcGIS Desktop?

I get greyscale image successfully , but I have some query about pixel value classification, because concrete have cement,fine and coarse aggregate. How can I classify this material through greyscale? ...
4
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1answer
2k views

Performing Random-Forest Classification of 10cm Imagery for species-distribution in R (no point-shapes)? [closed]

I'm trying to classify 10cm-resolution images with the RF-package. I do this to separate some species in the forest, seen on my images. While I was searching for an answer, I found the following ...
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0answers
59 views

Make Chessboard stack Image

I am learning some literature of works and came across a beautiful representation of image in chessboard form. That misaligned is not my current concern. We are group of bachelor students and are ...
8
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0answers
332 views

Executing bidirectional dijkstra on TIFF image?

Can anyone indicate an example of how to do this? Link, tutorial etc... I started a discussion here about how to load a TIFF image like a graph nicely answered by @sehe. But, in this post the image is ...
3
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0answers
872 views

Using WATERSHED to delineate tree crowns in ArcGIS Desktop? [closed]

I'm trying to delineate and count trees from a DSM/DTM generated from a UAV survey. It's from a citrus grove where trees are growing in different spacing. I have developed a workflow that works for ...