Questions tagged [matlab]

MATLAB® is a high-level language and interactive environment for numerical computation, visualization, and programming.

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TOA Reflectance and BOA Reflectance Matlab Sentinel 2

How to convert DN into TOA Reflectance and BOA Reflectance in MATLAB? If I have to use Sen2Cor for do that. How can i use Sen2Cor in MATLAB?
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6 views

Matlab's geographicToDiscrete function does not return the correct col, row

I have a shapefile with points (in WGS84) that overlap with a raster layer (also in WGS84) and for each point I want to calculate the corresponding col and row raster coordinates. I work on Matlab ...
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1answer
36 views

QGIS: Clip Raster by Mask Layer-permanently remove black edges

I want to introduce geotiff images generated in QGIS by clipping ortho imagery to a shapefile into matlab. However, the clipped raster images come with black borders. I managed to remove them in QGIS (...
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23 views

Atmospheric correction of InSAR interefrograms

I am trying to apply GACOS service to correct atmospheric artifacts on InSAR interferogram. In the GACOS manual provided with the GACOS_Ultility example, it is mentioned that data storage of the ...
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0answers
26 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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2answers
65 views

Geospatial Analysis

How can I convert spatial information like the elevation, land use(source:corine land cover map), location of power transmission lines, etc to a 2D array of numbers like a 2D spatial array based on ...
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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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1answer
73 views

Plotting data only inside polygon in MATLAB?

We can plot data with polygon in MATLAB as a data size of 651*1200*12 S.X and S.Y shows the X and Y values of polygon. for i = 1:12 subplot(4,3,i) pcolor(lon1,lat1,data(:,:,i)) ; shading interp ; ...
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43 views

How to detect the edge of the the curve?

I'm using MATLAB edge function to find the edge of an item in a picture. It's easy to deal with some individual item, like: I can use edge function to get the boundary However, when the picture ...
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1answer
684 views

Read raster data in Matlab

I have a GeoTIFF image (satellite image) and I need to read the values of every pixel to calculate the sum. How do I do that? I'm new in both Matlab and the geographic field.
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142 views

Pixel shifts from its actual position in Matlab geospatial plots?

I am plotting a spatial map in MATLAB, where I have LAT-LON info for corresponding fill values. Though the grid lines follows the meridian and parallels drawn in MATLAB plot domain, the fill values ...
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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 ...
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1answer
74 views

Running MFmask in MATLAB: Error using imfill

I am trying to create a cloud and cloud shadow masking raster using MFmask (https://www.sciencedirect.com/science/article/pii/S0034425717303073) for a Landsat 8 scene. MFmask 1.1 is modified version ...
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1answer
576 views

Using Geotiffwrite or Worldfilewrite for global TIF in MATLAB?

In MATLAB I have written the code: [image,geo]=geotiffread('africa.tif'); info=geotiffinfo('africa.tif'); geotiffwrite('Wafrica.tif',image,geo); but there was error: geotiffwrite>validateR (line ...
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0answers
80 views

Getting the area of a polygon from Google Earth or .xyz digital elevation model INCLUDING area due to topography

I'm doing some analysis for a study on geomorphology. For this I'm comparing the 'bumpiness' of lava fields to the 'bumpiness' of the surroundings. What I'm trying to do for this is measure the ratio ...
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482 views

How to convert an image .jpg to GeoTIFF (with georeference)

I did a linear regression of 26 images with the same structure (rows, columns, resolution, DATUM, projection) using MATLAB. The result that I have got is an image without spatial reference, other ...
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1answer
357 views

Reading LiDAR attributes from a .mat file?

I am working on some LiDAR dataset. I am used to importing the LiDAR data from .las files. I generally use liblas library in Python to import the same. Recently, I found the dataset in .mat format ...
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1answer
161 views

Read Matlab file as raster in R

I have a .mat file I got from someone, and it's supposed to represent global gridded data. I wanted to read it as a raster in R. Importing was ok, I was able to import using the R.matlab package >...
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0answers
166 views

Shortest path creation between two lines

I've a raster of temperature of a river, I'd like to extract values horizontally, so from bank to bank, shortest path. so basically extract pixel values along the red lines in the schema I did. What ...
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1answer
37 views

interferometry vertical wavenumber

I want to process a stack of Sentinel 1 SLC images (4) to produce tomographic layers for above ground biomass estimation. To do that, I need to generate the interferometric vertical wave number images ...
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1answer
199 views

Write referenced GeoTiff with 4 corners on matlab

I have some matlab raster matrix to export to geotif. I also have the location of each corner in Decimal degrees (WGS84). I know how to export and write the data into a geotiff but i'm having a ...
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0answers
421 views

Correctly display the colors in MATLAB colormap and colorbar?

I am plotting spatial maps with fill values ranging from 0.05 to -0.05 Below is the part of code for plotting colormap and colorbar colormap(brewermap([10],'RdYlBu')); caxis([-0.05 0....
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0answers
151 views

ENVI shows colors of different RGB code the same in a bitmap image wrongly?

As you see in this picture which I've captured in MATLAB, there are two colors. Red with the RGB code (255,0,0) Brown with the RGB code (138,139,1) I've tried to show the same picture in ENVI, ...
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0answers
350 views

Allign shapefile polygons and underlying image in MATLAB spatial plots?

I am plotting a map in MATLAB. For this I have values at corresponding Latitude-Longitude. I am creating meshgrids for Lat, Lon, and values for plotting the map. Somehow plotted map does not exactly ...
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2answers
90 views

How to adjust rows and columns, retaining cell sizes in arcmap?

The Situation: I have a vector data map with all the countries in the World, including a unique landcode for every country. I need to convert it into a raster map, so I can eventually analyse (with ...
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1answer
1k views

Sentinel-2 Reflectance calculation

which is the proceddure for reflectance calculation from Sentinel 2 1C products downloaded from ESA Scientific Hub?
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1answer
94 views

Lena Histogram 8 bit unsigned image

I am working on Lena image (unsigned 8 bit grayscale 512*512 pixels). I tried to plot the histogram using matlab (inbuilt imhist function) and in arcgis. I am getting different pixel count, appx duble ...
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1answer
424 views

from .hdf to .geoTIFF of product MOD35

I am trying to create a geoTIFF from an .hdf MOD35_L2, I am trying either a Matlab code, either I heard something about LDOPE-1.7 + MRTSwath but I am not really succeeding. Have anyone ever tried to ...
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1answer
276 views

Easiest way to create an area raster

The objective is to create a global geotiff raster at 30s resolution (appr 1km) with the pixel value the area of that pixel. I have multiple tools but struggle to find the easiest way. I am aware of ...
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1answer
188 views

Voronoi Polygon Coordinates

I am using Voronoi polygon coordinates and respective node coordinates together. To apply the load to that particular node which is obtained by summing up the loads that lies within the polygon. By ...
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0answers
141 views

Solar Potential roof-top analysis using GIS and Remote Sensing [closed]

3D Building models were generated by using Google Sketchup Pro and Google Earth. Then shadow casted 2D orthographic raster models were exported as TIFF or JPEG format. For further analysis with ...
2
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1answer
226 views

Using spectral library provided by USGS Spectroscopy Lab?

In the USGS Spectroscopy laboratory, the researchers there have worked very hard to measure reflectance of a hundreds of minerals (and plants). Look at this site I downloaded the splib04a - FTP ...
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1answer
370 views

Exporting data from ArcGIS for use in Fuzzy Logic in Matlab?

How can I export layers from ArcGIS for use in Matlab software for working with Fuzzy Logic, and what extension?
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0answers
51 views

SPOT 6 parameters to open data in matlab

I'm trying to open SPOT 6 data on Matlab using multibandread, but since I don't have some of the paremeters I'm only getting a black image. I've been looking on the web for these parameters but I ...
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1answer
299 views

Define polygons with structured data points

I am doing image processing and I get some scatter points (blue) now, filled with random points (red) on it. I want to find the random points lay inside scatter blue circles. So I tired with MATLAB ...
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1answer
540 views

How to remove cloudy pixel from MODIS NDVI (MOD13Q1)

I am using MODIS NDVI product (MOD13Q1) for the vegetation changes study. I want to remove cloudy or bad pixel from MODIS NDVI data. I am not getting any suitable method or software or any program to ...
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1answer
562 views

PSO for solving shortest path in matlab

I crate a file that represents 16000 edges with information of start node, end node and cost in a table. In MATLAB i want to solve shortest path with PSO algorithm. How i can solve it?
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1answer
204 views

ArcMap highlight features from code

I have a shapefile of lines containing an amount n of elements. I exported these features and analyzed them with another program (Matlab), which provided me as an output a row vector of length n ...
3
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0answers
325 views

Hot Spot Map in ArcMap and MATLAB [closed]

I've tried out the Hot Spot Map tutorial for ArcMap, which is working just fine, and I'm now starting to make some modifications so that it fits my data sets. Instead of aggregating the points as in ...
3
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1answer
1k views

Set NaN values to Transparent in Matlab 'geoshow' function?

I am trying to plot rainfall values in MATLAB using geoshow function. NaN values should be transparent in the map. However, the plot I am getting comes with dark blue color for NaN values. I have ...
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0answers
1k views

Creating spatial plot with colored polygons in MATLAB from shapefile?

I have a shapefile of that has 1800+ polygon features. Each polygon has unique value. How to create a spatial map for visual interpretation. Here is what I have tried in MATLAB. clear all; clc; ...
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0answers
215 views

Georeferenced Image Overlay and export to new image

I have two Geotiffs (one satellite image, one clipped image). I want to put the clipped image over the satellite image, because it shows flow velocity from this shown glacier (see image below). I ...
2
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0answers
81 views

Converting u and v from WGS84 to NZTM2000 - Do I need to do vector conversion?

I have u and v wind component values in latitude and longitude in WGS84. I want to convert this to NZTM2000. I've converted the lat/lon in ArcView - (and will try in R) - but do I need to also do some ...
3
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3answers
2k views

Flow Accumulation Python or MATLAB Script

does anyone have any resources for scripting the D8 flow accumulation in Python or MATLAB after obtaining the flow direction values and filling in 'sinks' and 'flats'? I am trying to understand the ...
3
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1answer
417 views

Spatio-temporal statistical analysis

I need to perform an anomaly analysis in both space and time. I have 4 data parameters: latitude, longitude, time and temperature. What I’m trying to do is to find temperature anomalies that are ...
3
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1answer
177 views

How to transform unknown coordinates?

I have two lists of coordinates in lat/long format which are showing the same points but in different coordinate systems. I need to find the corresponding points in two datasets using distance but ...
7
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6answers
3k views

Estimating river Channel Width using Python/ArcGIS/MATLAB/R?

I am trying to estimate the river channel width from digitized polygon or poly-lines shapefiles. To do so, I converted poly-line shape files to points.shp at regular intervals (at 1 cm). Later, I ...
3
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1answer
2k views

How to add a map created in QGIS to a Matlab plot

I am generating a number of plots in Matlab. I want to overlay these over maps I have created in QGIS. I thought the best way would be to import the maps as a geotiff into Matlab and then overlay my ...
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1answer
182 views

How to create grid from 2 separate images of latitude and longitude

I have two separate images of latitude and longitude, and want to create a grid from them so I can assign it to my Non-Geo referenced file... How can I create it, particularly in Matlab... But other ...
2
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1answer
959 views

How to label feature of shapefile on the color map in matlab

I am trying to make color map from text file data. I am using geoshow to call shapefile of the region and to set it as back ground of the color map. My shapefile is of the country. I have digitized ...