# Questions tagged [matlab]

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

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1 vote
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### What does "Common frequency offset" plot means in gnss raw measurements?

I'm using Google's MATLAB code to analyze raw gnss measurement made with gnsslogger android app. In plots, there is one in particular that I don't understand the meaning, which is "Common ...
• 11
1 vote
35 views

### How to make TIFF output file with coordinate reference system (CRS)

I am working on TIFF files to produce the median matrix for them, I am using the following Matlab code for that. How I can make the output as .tif while keeping the coordinate reference system (CRS)? ...
1 vote
46 views

### m_proj equivalent in R

I am looking for an equivalent function of m_proj form Matlab in R. I am familiar with the crs or st_crs function in R but it is difficult to set the lon and lat limits. I am looking to convert the ...
1 vote
823 views

### Trilateration using latitude/longitude points, and distances

I want to find out an unknown target location (latitude and longitude co-ordinates). There are +3 lat-long known points and for each point a distance in meters to the target location. I found some ...
• 11
100 views

### How can I use "spline" or Interpolation on a UK Map? [closed]

Basically, I have a number of data across a number of UK cities (London, Aberdeen, Birmingham, etc.). I want to plot them onto a map and then use something like a "contour map" to get ...
• 1
485 views

### How to interpret "AOD_QA" layer of MCD19A2?

I read hdf data using MATLAB, qa = hdfread("MCD19A2.A2003060.h28v04.006.2018018233855.hdf","AOD_QA"); According to page 13 of the user guide (MODIS Multi-Angle Implementation of ...
• 101
1 vote
497 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.
• 21
1 vote
2k 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 ...
• 111
1 vote
120 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 ...
1 vote
337 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 ...
• 413
895 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 ...
• 154
2k 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 (...
1 vote
100 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 ...
177 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 ...
323 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 ; ...
1 vote
91 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 ...
• 11
2k 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.
204 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 ...
• 695
1 vote
326 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 ...
117 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 ...
• 315
1 vote
2k 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 ...
1 vote
143 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 ...
961 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 ...
• 393
741 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 ...
• 23
1 vote
535 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 >...
• 311
231 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 ...
• 141
78 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 ...
403 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 ...
996 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....
• 695
340 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, ...
1 vote
585 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 ...
• 695
1k 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 ...
• 53
3k views

### Sentinel-2 Reflectance calculation

What is the procedure for reflectance calculation from Sentinel 2 1C products downloaded from ESA Scientific Hub?
• 483
288 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 ...
1 vote
628 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 ...
1 vote
978 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 ...
• 3,335
244 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 ...
1 vote
186 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 ...
454 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 ...
• 123
557 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?
1 vote
67 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 ...
339 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 ...
2k 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 ...
• 165
876 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?
287 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 ...
• 551
533 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 ...
• 93
3k 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 ...
• 695
1 vote
336 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 ...
• 31
129 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 ...
• 21