Questions tagged [matlab]
MATLAB® is a high-level language and interactive environment for numerical computation, visualization, and programming.
112
questions
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0answers
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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votes
1answer
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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0answers
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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0answers
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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0answers
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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0answers
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.
1
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0answers
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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0answers
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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0answers
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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0answers
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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0answers
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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0answers
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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0answers
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 ...
1
vote
0answers
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 ...
1
vote
0answers
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 ...
2
votes
0answers
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 ...
1
vote
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 (...
1
vote
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 ...
2
votes
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 ...
0
votes
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 ;
...
1
vote
0answers
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 ...
-1
votes
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.
3
votes
0answers
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 ...
1
vote
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 ...
0
votes
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 ...
0
votes
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 ...
1
vote
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 ...
0
votes
0answers
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
votes
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 ...
1
vote
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
>...
2
votes
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 ...
0
votes
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 ...
0
votes
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 ...
0
votes
0answers
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....
2
votes
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, ...
1
vote
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 ...
0
votes
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
votes
1answer
2k views
Sentinel-2 Reflectance calculation
which is the proceddure for reflectance calculation from Sentinel 2 1C products downloaded from ESA Scientific Hub?
0
votes
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 ...
1
vote
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 ...
1
vote
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 ...
-1
votes
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 ...
1
vote
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
votes
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 ...
-2
votes
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?
1
vote
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 ...
0
votes
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
votes
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 ...
0
votes
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?
0
votes
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 ...
