How to interpolate a lat lon satellite data on regular grid

7 ビュー (過去 30 日間)
Eugene Pashinov
Eugene Pashinov 2020 年 2 月 14 日
コメント済み: darova 2020 年 2 月 15 日
Hello. I have SWATH dataset of sateliite measurements. Data are not gridded, and consists of Latitude (1202x123) Longitude(1202x123) and data of measurements same size. I need to place data on regular grid 0.25x0.25 deg, and obtain result data array (720x1440). I've tried to use griddata:
result = griddata(Longitude,Latitude,V23_8,Glong,Glat);
imagesc(Glong(1,:),Glat(:,1),result)
axis xy
but there is some problems on edges.
And result of geoshow:
geoshow(Latitude,Longitude,V23_8,'DisplayType','texturemap')
How to get gridded data array same as it makes geoshow?
Attached of data sample.

回答 (1 件)

darova
darova 2020 年 2 月 15 日
I just created new mesh
[m,n] = size(V23_8); % original size
[gm,gn] = size(Glat); % result size
[X,Y] = meshgrid(1:n,1:m); % original mesh
gx = linspace(1,n,gn);
gy = linspace(1,m,gm);
[GX,GY] = meshgrid(gx,gy); % new mesh
Glat = griddata(X,Y,Latitude,GX,GY);
Glong = griddata(X,Y,Longitude,GX,GY);
result = griddata(X,Y,V23_8,GX,GY);
subplot(121)
h1 = pcolor(Longitude,Latitude,V23_8);
subplot(122)
h2 = pcolor(Glong,Glat,result);
% set(h1,'edgecolor','none')
% set(h2,'edgecolor','none')
  2 件のコメント
Eugene Pashinov
Eugene Pashinov 2020 年 2 月 15 日
編集済み: Eugene Pashinov 2020 年 2 月 15 日
Thsnks, but grid coordinate map should not be changed
darova
darova 2020 年 2 月 15 日
Impossible

サインインしてコメントする。

カテゴリ

Help Center および File ExchangeGeometric Geodesy についてさらに検索

製品


リリース

R2019b

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by