forked from mikebianco/locally-sparse-tomography
-
Notifications
You must be signed in to change notification settings - Fork 0
/
slownessMap3.m
34 lines (27 loc) · 844 Bytes
/
slownessMap3.m
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
function [ s ] = slownessMap3(type)
% function for generating synthetic slowness maps
% INPUT: 'type'='ch' or 'sd' for checkerboard or smooth-discontinuous
% profle
% 12/8/18 Michael J. Bianco
if type=='ch'
% checkerboard image
ds = checkerboard(10,5,5) > 0.5; % regular checkerboard
ds = padarray(ds,[2,2]); %shifted checkerboard
ds = (ds(1:100,1:100)-0.5)/5;
elseif type=='sd'
% smooth variation with discontinuity
ds_maskBar = zeros(100,100);
ds_maskBar(:,47:52)=1;
%
[xx,yy]=meshgrid(1:100,1:100);
ds = (sin(2*pi*(xx-10)/50)+sin(2*pi*(yy+10)/50))/2;%-sqrt(2)/2; % sinusoidal slowness
ds = ds*0.1; %scaling sinusoid
ds_bar = ds.*ds_maskBar;
ds = ds-ds_bar+0.1*ds_maskBar;
else
disp('invalid type!')
return
end
% adding perturbations to background speeds
s = ds+0.4;
end