對三維數據進行裁剪

List<Range> tyxRanges = new ArrayList<>(); tyxRanges.add(new Range(null,0,12)); tyxRanges.add(new Range(null,0,12)); tyxRanges.add(new Range(null,0,12)); Array varData = varObject.read(tyxRanges); ncWrite.write(varVar, varData);

只顯示了左下角的區域。

增加對時間變量的裁剪

public String varExport(@ModelAttribute FileSaveVars params ) throws IOException, InvalidRangeException, ParseException { // 0° 設置時間String timeStart = "2018-01-01 00:30:00";String timeEnd = "2018-01-01 00:40:00"; // 1° 設置原始文件路徑+轉存文件路徑String filePath = "/Users/caowei/workspace/jszone/大氣系統/ncdemo/src/main/resources/static/MERRA2_400.tavg1_2d_flx_Nx.20180101.SUB.nc";String savePath = "/Users/caowei/workspace/test.nc"; // 2° 讀取文件NetcdfFile ncFile = NetcdfFile.open(filePath, null); // 3° 設置需要轉存的變量String varName = "QLML"; // 4° 設置時間變量Variable timeObject = ncFile.findVariable("time");String timeAt = timeObject.getUnitsString();String regex = "\\d{4}-\\d{2}-\\d{2} \\d{2}:\\d{2}:\\d{2}";Pattern p = Pattern.compile(regex);Matcher matcher = p.matcher(timeAt);if (matcher.find()) {timeAt = matcher.group(0);} // 4-1° 獲取時間差int timeDiff1 = DateHelp.dateDifference(timeAt,timeStart);int timeDiff2 = DateHelp.dateDifference(timeAt,timeEnd); // 4-2° 獲取時間步長Array timeArray = timeObject.read();int timeStep = (int)(timeArray.getFloat(1) - timeArray.getFloat(0)) ;int startIndex = timeDiff1/timeStep;int endIndex = timeDiff2/timeStep; // 5° 獲取需要轉存的變量對象Variable varObject = ncFile.findVariable(varName); // 6° 構造輸出保存文件NetcdfFileWriter ncWrite = NetcdfFileWriter.createNew(NetcdfFileWriter.Version.netcdf4, savePath); // 6° 設置文件的一些參數 // 7°-1緯度for(Dimension dimension : varObject.getDimensions()){System.out.println(dimension.getShortName());System.out.println(dimension.getLength());ncWrite.addDimension(null, dimension.getShortName(), dimension.getLength());} // 7°-2變量Variable varVar = ncWrite.addVariable(null, varObject.getShortName(), varObject.getDataType(), varObject.getDimensionsString());System.out.println(varVar.getDimensions()); // 7°-3設置屬性List<Attribute> AttrList = varObject.getAttributes();for (Attribute att : AttrList) {varVar.addAttribute(att);} // 8°創建ncWrite.create(); // 9°將數據寫入List<Range> tyxRanges = new ArrayList<>();tyxRanges.add(new Range(null,startIndex,endIndex));tyxRanges.add(new Range(null,0,120));tyxRanges.add(new Range(null,0,120));Array varData = varObject.read(tyxRanges);ncWrite.write(varVar, varData); // 10°關閉保存ncWrite.close();return "OK"; }

總結

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