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Questions tagged [digital-image-processing]

The field of raster image processing

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12 views

How to export a rasterio window to an image without geo-reference information?

I would like to export a rasterio window to an image. import rasterio def export_window(w, path): number_of_bands, height, width = w.shape profile = { "driver": "JPEG", "...
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1answer
32 views

Orfeo Toolbox maps Pleiades wrong

I have a problem with Orfeo Toolbox (OTB) function OrthoRectification. I have a Pleiades product which is an extract (not a whole scene) of a small area in the western hemisphere south of the equator ...
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1answer
34 views

Preparing two images with different dimensions to use in Agisoft PhotoScan

I have two aerial photos that are flowed over the national forest. The photos were scanned by a contractor and they came in various dimensions for each photos. The one I have had smaller dimension ...
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1answer
19 views

Unable to activate analytic asset in satellite Imagery

I was trying to import the map of Melbourne. I was able to fetch the details from API coordinates but when i am trying to check the analytic asset status, it is returning inactive. # extract image ...
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1answer
53 views

Cloud mask for worldview

I'm using worldview imagery downloaded from gbdx and I want to apply cloud mask for it. It's preferable to use ready-made layer or some python module/tool to create it. The demand for the method ...
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0answers
77 views

Histogram matching in Google Earth Engine?

Does anyone know if there is a more GEE-friendly way of achieving this? I'm experimenting with S1 SAR image histogram matching in GEE and was wondering if foremost the code can be improved. Read here ...
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0answers
23 views

Generate multiple polygons based on JPEG image?

I have a number of image files depicting polygons (the original shapefiles are lost). Is there a way to automatically create new polygons in GIS, based on the form of the shapes visible in the image? ...
2
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1answer
68 views

QGIS raster calculator ^2 operation gives negativs results

I want to compare 2 same tiles at different dates. I use the raster calculator like this : (IR_band_frb - IR_band-aug)^2 But I get this result : The data range goes from -6049 to 4486 ... Why I ...
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2answers
62 views

Detecting 12bit images in 16bit

Setting For the purpose of a machine learning algorithm I'm tying to automatically scale images of arbitrary bitdepth to unit interval, i.e. I want to map pixels from [0,2x] to [0,1] simply by ...
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30 views

How to get pixel per meter in MATLAB

I have a vector shapefile which is in unit of 'Meter' presenting boundary of overall Germany. I am converting it into raster format based on each pixel representing 300 Meters respectively. After ...
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0answers
25 views

QGIS raster files not aligned due to different extent

I have a DEM file of building heights calculated from DSM-DTM in QGIS. Based on this DEM file, I generated a mask that indicates the presence of buildings in matlab. However, when I load the building ...
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84 views

What does cumulative count cut actually do?

I have a grayscale satellite image (16-bit image) which is dull (low brightness). When I apply cumulative count cut from 2 to 98 percent (Properties -> Min-Max Setting -> Cumulative count cut), it ...
2
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1answer
64 views

Reading large image using GDAL?

I want too read large image. The image size is 92117 x 30313 pixels. So far I know cv2.imread can not read large size. How can I read using GDAL API?
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43 views

Assessing quality (accuracy and precision) of digital surface model (DSM)?

I have been trying to build digital surface model from stereo satellite images. I do some initial research of it, it looks like I have to go outside and manually measure the height of an object (...
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1answer
36 views

Image Overlay 3D Adapt in Google Earth

When adding an image overlay (specifically a GeoTiff exported from QGIS), the image looks great until you turn on 3D buildings or terrain. These features pop through the image overlay, and disrupt the ...
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0answers
24 views

Mapping a LinearFit to colors

Refering to EE>Examples>LinearFit (https://code.earthengine.google.com/598af3369de7a4845f0325030a66e0e1) I would like to check my understanding. On line 20 comment says: // Display trend in red/blue,...
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13 views

Normalizing a single band of landsat 8 imagery w.r.t an adjacent one

We have 23 landsat 8 level 2 imageries which has to be mosaiced. Based on date, we have mosaiced individual bands (B1, B2, B3, B4, B5, B6) and now it's down to 5 imageries. But we are not getting a ...
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36 views

Matrix union in ArcGIS

How can I do matrix processing in ArcGIS or ERDAS Imagine? l have two different raster images for change detection. Matrix join same code filed information. In this video link already done matrix in ...
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89 views

Earth Engine: Function to generate daily image collection from 3 hourly

I am working with GLDAS-2.1 image collection. I would like to generate a daily image collection with max temperature, min temperature, mean temperature and sum temperature for each day from 3 hourly ...
2
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2answers
143 views

Feature normalization (scaling) for Hyperspectral images

I have been straggling with the concept of feature normalization for the hyperspectral images. Respect to my problem I have attached a picture of my problem which clearly stands the issue which I have....
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0answers
17 views

No Data Holes in Certain Tiling Scheme Levels in Mosaic Dataset Imagery Cache

I have a mosaic dataset containing three other mosaic datasets (one containing county imagery, one containing regional imagery, and one containing city imagery) I have them ordered by putting the ...
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0answers
199 views

Writing code to add calculated image to display in Google Earth Engine?

I wrote a code for Land Surface Temperature (LST) from Landsat 8 images in google earth engine. I have successfully calculated the following steps, NDVI, fractional vegetation (fv), emissivity (EM), ...
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1answer
1k views

Reading a 4 band image with rasterio (python)

I am trying to view a tif satellite image which has 4 bands. I want to remove the last band (NIR) and view the RGB image only, so I am trying to split the NIR from the rest of the image. Here is my ...
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85 views

Batch processing DTM with Hillshade in QGIS 3

I'm using the Hillshade tool from GDAL library [Raster analysis] in QGIS 3.4. I can't use the batch process with creative options like compress=LZW or profile=Geotif. It doesn't work. The tool works ...
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2answers
90 views

Relative Radiometric Normalization of multisensor Landsat Level 2 images using R

For my time series analysis, i need to use images of the three Landsat sensors (TM, ETM+ and OLI). I chose the already atmospheric corrected surface reflectance/Level-2 products. Due to the ...
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46 views

Pre-Processing for multi-sensor Time series analyses based on Landsat Level 2 imagery

I downloaded TM, ETM+ and OLI Surface Reflectance Higher-Level Data Products (atmospheric corrected) based on L1TP Landsat images (radiometrically calibrated, orthorectified). I need to include images ...
3
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1answer
108 views

Performing Supervised Classification on Sentinel Image using ArcGIS Desktop?

Is it possible to perform supervised classification on Sentinel Satellite Image with the minimum error. I compared two raster, one being the manual classification of an area using Photoshop CS6 and ...
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1answer
27 views

Two different CRS somehow works? [duplicate]

I am overlaying some WGS84 (EPSG:4326) coordinates over a few DEM rasters with EPSG:102710 (NAD_1983_STATEPLANE_NEW_HAMPSHIRE_FIPS_2800_FEET) When they are these two different layer CRS the ...
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1answer
221 views

How to convert masks generated by rasterio to channel last mask

The problem is about using rasterio to generate mask from GeoJSON file which contains geographic coordinates. The function that I used is from: from rasterio.tools.mask import mask with rasterio....
7
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1answer
485 views

Counting rocks of different sizes on shoreline using ArcGIS Desktop? [closed]

I have a 5cm resolution geotiff image for a shoreline. I need to count the number of rocks in three classes (e.g., >6 feet, 3-6 feet, and <3 feet). I don't have any point cloud data. What will be ...
1
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2answers
570 views

Pansharpen landsat mosaic in Google Earth Engine

Does anyone have a good way to pansharpen an entire mosaic of landsat 8 images? I would use the Panchromatic band (band 8). I have found tutorials on how to pansharpen a single image, but not for a ...
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1answer
50 views

Colorize radar imagery so it looks like optical imagery

Here is an imagery from a radar satellite Is it possible to colorize a radar image, so it looks like and enables the same kinds of analysis as for an image captured from an optical satellite (simple ...
1
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1answer
312 views

conditional statements for raster in R - land surface temperature

Im trying to calculate Land surface temperature estimating with Landsat 8 images, but i got stuck in one place and i cant move on. I m following split window algorithm. I calculated NDVI and I have ...
0
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1answer
105 views

Satellite image in ArcGIS darker than usual

This is one image from 2013 in some área. This is another image from 2014 in the same área, but darker. why? How can I display it like in 2013. Both are Landsat 8 images.
3
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1answer
704 views

Retrieving exif tags from GeoTiff with GDAL?

I work on toolkit that automatically classifies data from a bunch of aerial cameras. Each camera uses geotagging to store position and time metadata in EXIF tags. When I use GDAL (I use version 2.0....
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1answer
103 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
81 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
22 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
258 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 ...
2
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1answer
125 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
629 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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2answers
147 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 ...
1
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1answer
446 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 ...
-1
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2answers
569 views

SCP QGIS sentinel 2 authorization error

I am using Qgis 2.18.16, when i tried to download sentinel 2 via SCP interface, I am getting following error: Authentication Required
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0answers
164 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
388 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 ...
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1answer
54 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
294 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], ...
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1answer
67 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 ...