How to extract and save water depth data from a 2dm file?

Do you know about a program called 'Surface-water Modeling System (SMS)'? I am doing homework to create a 'homework_depth.dat' file using the 'homework.2dm' file created by the SMS program to meet the conditions described later. Currently, I created the code as below, but the depth data is not recorded in the 'homework_depth.dat' file. It seems that depth data extraction is not working properly with this code alone. How should I modify the code below to make it work properly? I am uploading the work I have done so far.

The conditions are as follows:

Deepest: obc (far left of grid in .2dm file)

Shallowest: Freshwater input boundary (far right of grid in .2dm file)

Deepest water depth: 50m

Shallowest water depth: 30m

Constant decrease only in the X-axis direction

Scatter interval: 100m each on the x-axis, 50m each on the y-axis

%% Code

clear all; clc; close all;

pwd;

addpath('./01__Data')

conf.base = fullfile(pwd, '01__Data', 'make_input');

filePath = fullfile(conf.base, 'homework.2dm');

outputFilePath = fullfile(pwd, '01__Data', 'homework_depth.dat');

fileID = fopen(filePath, 'r');

data = textscan(fileID, '%f %f %f', 'HeaderLines', 1);

fclose(fileID);

depth = data{3};

minDepth = 30;

maxDepth = 50;

xGrid = data{1};

yGrid = data{2};

depth(xGrid == min(xGrid)) = maxDepth;

depth(xGrid == max(xGrid)) = minDepth;

xInterval = 100;

yInterval = 50;

[~, index] = sort(xGrid, 'descend');

depthSorted = depth(index);

fileID_dat = fopen(outputFilePath, 'w');

for i = 1:length(depthSorted)

fprintf(fileID_dat, '%f\n', depthSorted(i));

end

fclose(fileID_dat);

Answer 1

[Angelo Yeo]

You may have an issue with importing data. "fopen" and "textscan" are low-level functions, and it may be hard to get them to use properly.

Why don't you try readtable? It offers numerous options and can potentially import the data as per your requirements. Give the code below a shot to see if it accomplishes the desired data import:

%% Set up the Import Options and import the data
opts = delimitedTextImportOptions("NumVariables", 6);

% Specify range and delimiter
opts.DataLines = [3, Inf];
opts.Delimiter = " ";

% Specify column names and types
opts.VariableNames = ["MESH2D", "VarName2", "VarName3", "VarName4", "VarName5", "Var6"];
opts.SelectedVariableNames = ["MESH2D", "VarName2", "VarName3", "VarName4", "VarName5"];
opts.VariableTypes = ["string", "double", "double", "double", "double", "string"];

% Specify file level properties
opts.ExtraColumnsRule = "ignore";
opts.EmptyLineRule = "read";
opts.ConsecutiveDelimitersRule = "join";
opts.LeadingDelimitersRule = "ignore";

% Specify variable properties
opts = setvaropts(opts, ["MESH2D", "Var6"], "WhitespaceRule", "preserve");
opts = setvaropts(opts, ["MESH2D", "Var6"], "EmptyFieldRule", "auto");

% Import the data
homework = readtable("homework.txt", opts); % You may change it to 2dm file you work with.
head(homework)

    MESH2D    VarName2    VarName3    VarName4    VarName5
    ______    ________    ________    ________    ________

    "E3T"        1            2          11          12   
    "E3T"        2           11           1          10   
    "E3T"        3            1          11           2   
    "E3T"        4            2          12           3   
    "E3T"        5            3          12          13   
    "E3T"        6           13           4           3   
    "E3T"        7           14           4          13   
    "E3T"        8           14           5           4   

My last comment is: utilizing the "Import Data" feature in MATLAB is worth mentioning as it holds significant power.

Answer 2

[Kyoung Moon Lee]

use meshgrid

In my opinion, next time don't post the original homework file as is.

% enther lon, lat, depth
x = [];
y = [];
z = [];

% make grid
[x y] = meshgird(x,y);

% save file
writematrix([x(:),y(:),z(:)],'homework_depth.dat')

[영택 조]

Thank you. I'll try more.