Questions tagged [matlab]

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

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11 views

MATLAB NC converted to TIFF

This is my code: GeoRef = georasterref('Rastersize',[1440,721],'Latlim',[-90,90],'Lonlim',[-180,180]); data=ncread('G:\ERA_humid\humid.nc','r'); for year=1979:2020 data1=data(:,:,1+12*(year-...
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32 views

Import MATLAB data (.mat) in GRASS

I have a file from MATLAB in (.mat) format. I want to import this in GRASS GIS, but I get the following warning.
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16 views

Creating matrices of coordinates for a given geoTIFF

I have GeoTIFFs that are in a given projection, I'm trying to figure out what the easiest way would be to produce corresponding matrices for the the GeoTIFFs that hold the lat, lon, and meters ...
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37 views

Convert MATLAB colormap to QGIS

I want to to use a very good looking colormap/color ramp from a MATLAB program LINK in QGIS 3.x. I already tried to save a colorramp from QGIS and insert the values from the MATLAB colormap after ...
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76 views

How to generate a DEM from a 3D point cloud in MATLAB?

I'm trying to generate a DEM (or a DSM if that works for this purpose) from a .ply point cloud in MATLAB so that I can generate a hillshade from it and this is what I have managed so far but have no ...
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84 views

Read geopackage in Matlab

How do I load geopackage (https://www.geopackage.org/) in Matlab. I am trying to replace the shapefiles with geopackage due to several limitations inherent in shapefile.
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502 views

Compute elevation and azimuth from lat, lon, and altitude

Given the latitude, longitude and altitude of two points (in my case satellite and ground antenna) I would like to compute the azimuth and elevation angle between the two points from the ground ...
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41 views

Issue with image georeferencing of precipitation data generated by matlab.Map output is not matching with WRF output

I am trying to generate a map by using .nc output generated by a WRF model. WRF process gives out a map output for visualization. The .nc file is analysed in Matlab for gridded precipitation data ...
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33 views

Matlab mapshow with NaN in different color

I would like to have a different color for NaN values however when I plot this code bellow the A matrix is plotted wrongly not of the size of A but smaller by one pixel for rows and one for column. ...
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30 views

Matlab mapshow raster plot change colormap

I want to change the colormap of a raster plot with mapshow(), however it always plot in grey: figure('position', [500, 40, 950, 950]); mapshow('RasterFile.tif', 'DisplayType','image'); colormap jet; ...
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26 views

Problem with open .tif file in Matlab

I have a tif file which represents the altitude for a country, I can simply open it in Esri's ArcGIS (Arc Map), Here is the result from ArcMap: You can see the High and Low elevations are shown by a ...
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15 views

spatially extract global hdf5 to subregion

I need to download some SMAP L4 soil moisture data from https://nsidc.org/data/SPL4SMAU/versions/4 . The interface allows for spatial filtering to select a subregion of the global domain either by ...
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20 views

Using MATLAB mapping toolbox,how to create geotiff from NED data and lat/lot reference?

I have 3 matrixes for N,E,D in feet and a ref lat/lon, how can I generate a geotiff in 2019b. I am aware of geotiffwrite(), but am confused on how to create the "Spatial referencing information" from ...
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61 views

Create cross sections equally spaced in a poly line imported from QGIS to MATLAB?

I had to create an Excel sheet with each profile cross-section which gave me the coordinates and elevations from a poly line of 2300 m length, referenced from 5 different DGM, which composed the study ...
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104 views

Cropping Landsat images with shapefile in MATLAB

I want to crop several Landsat images, of different satellites, in MATLAB employing a shapefile. For only one image, I could manage to do it properly. But if I try the same with a second image, the ...
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310 views

Writing a GeoTIFF file that is rotated with respect to a projected coordinate system using Matlab's Mapping Toolbox

I've been prototyping some processing techniques for SAR images in Matlab. This requires importing a GeoTIFF file, and then exporting a file with modified data but the same spatial reference. I have ...
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1answer
600 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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2answers
76 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
29 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
170 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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51 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
1k 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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154 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
206 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
93 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
1k 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
88 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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612 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 ...
2
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1answer
442 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
267 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
190 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
46 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
278 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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563 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
199 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
455 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
379 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 ...
2
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1answer
2k 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
134 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
491 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
551 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
196 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
155 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
301 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
445 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
55 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
313 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 ...
3
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3answers
756 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
683 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
228 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 ...