How to extract the data from .nc file based on lat,lon ?
조회 수: 1 (최근 30일)
이전 댓글 표시
Hi, I have .nc file. I have to extract the data based on lat,lon points. I tried the following code,
precJanuary = ncread('\C:\Users\divecha21\Desktop\errorBar\tasmax_day_GFDL- ESM2M_rcp85_r1i1p1_20060101-20101231.nc','tasmax',[1 1 1],[10 10 1]);
disp(precJanuary);
After the execution I got the data for 10 lat,lon points.
Instead of that start,end I tried latitude,longitude limits.
I got the following error,
precJanuary = ncread('\C:\Users\divecha21\Desktop\errorBar\tasmax_day_GFDL- ESM2M_rcp85_r1i1p1_20060101-20101231.nc','tasmax',[60.25 5.25 1],[97.25 36.75 1]);
Error using ncread Expected start to be integer-valued.
Error in internal.matlab.imagesci.nc/read (line 557) validateattributes(start,{'numeric'},...
Error in ncread (line 58) vardata = ncObj.read(varName, varargin{:});
Error in sample1 (line 28) precJanuary = ncread('\C:\Users\divecha21\Desktop\errorBar\tasmax_day_GFDL-ESM2M_rcp85_r1i1p1_20060101-20101231.nc','tasmax',[60.25 5.25 1],[97.25 36.75 1]);
Can any one help me to clear this?
Thank you
댓글 수: 0
채택된 답변
Geoff Hayes
2014년 5월 26일
According to the ncread command documentation (type help ncread in the Command Window) the START and COUNT inputs are defined as:
For an N-dimensional variable START is a vector of 1-based indices of length N
specifying the starting location. COUNT is also a vector of length N specifying
the number of elements to read along corresponding dimensions. If a particular
element of COUNT is Inf, data is read until the end of that dimension.
In the above code, you are supplying rational (non-integer) inputs as the START and COUNT, hence the error Expected start to be integer-valued.
댓글 수: 2
Geoff Hayes
2014년 5월 27일
편집: Geoff Hayes
2014년 5월 27일
The ncread command is expecting integer inputs for START and COUNT not rational inputs like 60.25, 5.25, etc. Those are not valid inputs and so you observe the above error.
You may have to read through all of the data until you find the region that corresponds to India. Unless there is another variable that may hint at which records belong to the area of interest?
추가 답변 (1개)
Catubela matlab
2014년 8월 8일
@alagu mathi did you find a way to do this? I'm also interested in how to extract data for a subdomain based on lat lon values
참고 항목
카테고리
Help Center 및 File Exchange에서 Data Import and Export에 대해 자세히 알아보기
제품
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!