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Questions tagged [topography]

45 questions
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topography data, string '-' can't be converted to float

I'm attempting to import cornea topography data from a CSV file. The imshow fails to plot the data after slicing the axes and converting all to np.array, displaying the error message "raise TypeError("Image data of dtype {} cannot be converted to…
Payman Rajai
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How to create Topographic 3d graphs in r?

I have come across some cool topographic maps on reddit and wonder how they can be made in r ? from: reddit image post link Is it even possible to create such maps in r and what kind of data files does it need to create them ?
ViSa
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Possible ways to incorporate topography in a correlated random walk in R?

I was wondering which possibilities there are for incorporating topography in a correlated random walk in R. I have a digital elevation model (DEM) of the study area. I would like for my random walk to avoid areas with a steep slope. walk <-…
neòinean
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How to apply a Sea mask over a NetCDF file using CDO

Let's say I have made a netCDF file, which has a lot of zeros. I want to apply a sea mask to the data, such that only the regions in the sea are really masked and the data on the land is retained. The data that I have has a lot of zeros on land…
Ep1c1aN
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EEG topography from basic

I am trying to develope a program that can draw this picture based on user input. https://www.researchgate.net/post/How_to_plot_topographical_map_of_scalp_from_EEG_data I am trying to use c# from Visual Studio 2017 to write this program. I had…
STREETKILLER007
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Changing the coordinate map in function of its coordinates (gravitational lensing)

I'm trying to compute the optical phenomenon called Gravitational Lensing. In simple words its when a massive object (or with massiva mass) its between me as an observer and a star or some clase of light source. Because its massive mass the light…
Edmundo Lopez Calderon
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Calculate angle of matrix with topography for each triangle

I have a matrix with data of a topography, let's say several hills. I want to have information of the angle of each data point to the vertical line. Here are two examples: If I consider a place near the foot of the hill that is totally flat, I have…
tardis
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LandXML to Topography.ByPoints doesn´t work as expected

I´m new here, so I hope this thread doesn´t exist already. I exported a LandXML file from Civil3D. In this file are 3 surfaces listed. Now my aim is to import it in revit and convert it to a topography. It was no problem to extract all the points…
NancyRue
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Separating one isoline from contour function

I used the contour function on an RGB image (after separating the three channels) and now I want to treat each isoline separately. How I can get each isoline information in a separate matrix? I have 9 isolines and I want 9 matrix's. I tried this one…
Sergio
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Bilinear interpolation on integer coordinates within a Delaunay triangulation

I have a planar Delaunay triangulation consisting of about 1 million triangles. Each vertex is tagged with several scalar metrics [1], and I would like to see a fast, simple interpolation of each of those metrics on the same regular grid. For…
dholstius
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How to add a topographic map to a shapefile?

I wonder how it's possible to add this topographic information (elevation) to the map of Santa Cruz Island and all of the Galápagos Island that I have here. library(rgdal) library(rgeos) library(ggplot2) library(ggthemes) library(ggsn) myGPS =…
M. Beausoleil
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Trying to plot a topographical contour map in R, but I'm getting an error: "Error in plot.new() : figure margins too large"

I have two vectors, one being all my longitudes and the other being all my latitudes. My longitude vector has a length of 720 and my latitude vector has a length of 360. In addition to these vectors, I have a matrix that is 360x720 containing all…
Lilly
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How can I calculate the number of sun hours for a given day and location, considering nearby mountains (with Python)?

My goal is to compute the number of hours for a given day that the sun shines on a given location using Python, under the assumption of a clear sky. The problem arises from the search for real estate. I would like to know how much sun I will…
harry_k
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Topography height prediction from 2D image

I would like to train 2 D images with the corresponding pixel heigh topography information. I have a bunch of 2 D images taken from a topography where the height of each pixel is also known. Is there any way that I can use deep learning to train the…
Anahita Imanian
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How to write topography function for eeg

I am writing a HW neurofeedback app. Which wotks like this: https://www.youtube.com/watch?v=pjCghiq5FoQ In this case it is a demo which is not actually working. I have data from EEG and I want to plot them on the surface by LEDs. The technique is…
Michael Tesař
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