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Re: [Fwd: 20040827: netCDF Java - How do I export a single variable to a GeoTiff file?]





To: address@hidden
From: "andrew fox" <address@hidden>
Subject: netCDF Java - How do I export a single variable to a GeoTiff file? 
Organization: USDA
Keywords: 200408272156.i7RLuqsB013099



Institution: U.S.D.A APHIS
Package Version: UI Webstart version
Operating System: Win XP Pro
Hardware Information: Dell workstation: dual intel xeon 2.37 GHz processor, 2 GB RAM Inquiry: I am trying to use the Java netstart netcdf UI tool interface: http://my.unidata.ucar.edu/content/software/netcdf-java/v2.1/webstart/index.html?unidata=5ecf7c4c34abe333603544ecc312610d
I have a netcdf file with about 50 variables in a matrix form registered to a map grid. I am trying to use the netcdf UI program to export a single variable to a GeoTiff file. I created a folder in: C:\data\geotiff\test to hold output geotiff files and am able to create a single geotiff file from the .nc file but I cannot figure out how to export a single variable from the netcdf file to a geotiff file? Is it possible to export a single variable from a netcdf file containing many variables to a geotiff file? Thanks very much! Andrew Fox 


Andrew,
The answer is yes and this is how geotiff api designed. Here is a example you can refernece (assuming that you already have netcdf-java packages): 

import ucar.ma2.*;
import ucar.nc2.*;
import ucar.nc2.dataset.*;
import ucar.nc2.geotiff;
import ucar.nc2.dataset.grid.*;
import ucar.unidata.geoloc.*;
import ucar.unidata.geoloc.projection.*;

import java.io.*;
import java.util.*;


 public static void main(String args[]) throws IOException {
   String fileOut = "totalr1.tif";
GeotiffWriter writer = new GeotiffWriter(fileOut); writer.writeGrid("dods://www.cdc.noaa.gov/cgi-bin/nph-nc/Datasets/noaa.oisst.v2/sst.mnmean.nc", "sst", 0, 0,false); //writer.writeGrid("/home/yuanho/dev/netcdf-java/geotiff/2003072918_avn-x.nc", "T", 0, 0, true, llr); 
   writer.close();

 }

Let me know if you need further help.


Yuan
address@hidden
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