gdalwarp.exe 调用

本文主要是介绍gdalwarp.exe 调用，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

下载

https://www.gisinternals.com/stable.php下载所需版本的编译好的Gdal

如：
release-1900-x64-gdal-2-4-mapserver-7-4.zip为编译好的dll，c#可以直接使用
release-1900-x64-gdal-2-4-mapserver-7-4-libs.zip，包含头文件和gdal.lib，c/c++可以直接使用

apps

release-1900-x64-gdal-2-4-4-mapserver-7-4-3\bin\gdal\apps目录下包含gdalwarp.exe，需放在外层gdal204.dll同级目录下

wkt 格式

Gdal3.0后 SpatialReference类的导出wkt函数

exportToWkt(out string argout,string[] options)

参数说明

主要设置 MULTILINE=YES / NO，FORMAT=SFSQL / WKT1_SIMPLE / WKT1 / WKT1_GDAL / WKT1_ESRI / WKT2_2015 / WKT2_2018 / WKT2 / DEFAULT

本次调用源影像投影字符串为WKT1_ESRI格式

string esriString;
string gdalString;
var formatEsri = new[] { "FORMAT=WKT1_ESRI" };
var formatGdal = new[] { "FORMAT=WKT1_GDAL" };
spProj.ExportToWkt(out esriString, formatEsri);
spProj.ExportToWkt(out gdalString, formatGdal);

两种格式 投影名称不同

WKT1_ESRI格式

"PROJCS[\"CGCS2000_3_Degree_GK_CM_123E\",GEOGCS[\"GCS_China_Geodetic_Coordinate_System_2000\",DATUM[\"China_2000\",SPHEROID[\"CGCS2000\",6378137,298.257222101]],PRIMEM[\"Greenwich\",0],UNIT[\"degree\",0.0174532925199433,AUTHORITY[\"EPSG\",\"9122\"]]],PROJECTION[\"Transverse_Mercator\"],PARAMETER[\"latitude_of_origin\",0],PARAMETER[\"central_meridian\",123],PARAMETER[\"scale_factor\",1],PARAMETER[\"false_easting\",500000],PARAMETER[\"false_northing\",0],UNIT[\"metre\",1,AUTHORITY[\"EPSG\",\"9001\"]],AXIS[\"Easting\",EAST],AXIS[\"Northing\",NORTH]]"

WKT1_GDAL格式

"PROJCS[\"CGCS2000 / 3-degree Gauss-Kruger CM 126E\",GEOGCS[\"China Geodetic Coordinate System 2000\",DATUM[\"China_2000\",SPHEROID[\"CGCS2000\",6378137,298.257222101],AUTHORITY[\"EPSG\",\"1043\"]],PRIMEM[\"Greenwich\",0],UNIT[\"degree\",0.0174532925199433,AUTHORITY[\"EPSG\",\"9122\"]]],PROJECTION[\"Transverse_Mercator\"],PARAMETER[\"latitude_of_origin\",0],PARAMETER[\"central_meridian\",126],PARAMETER[\"scale_factor\",1],PARAMETER[\"false_easting\",0],PARAMETER[\"false_northing\",0],UNIT[\"metre\",1,AUTHORITY[\"EPSG\",\"9001\"]],AXIS[\"Easting\",EAST],AXIS[\"Northing\",NORTH]]"

命令行调用 gdalwarp.exe

重采样方法：-r cubic
输出分辨率：-tr 2 2
设置瓦片：-co TILED=YES，默认为条形
输出投影：-t_srs “wkt”，支持 从SpatialReference导出的wkt字符串，但需要双引号包裹

以下为c#启动进程调用 gdalwarp.exe

const string projName = "PROJCS";
const string centralMeridian = "central_meridian";// ProjectionString从影像获取
var spProj = new SpatialReference(ri.ProjectionString);
// spProj 操作 ...
// .GetProjParm获取中央经线，可对应设置
// .GetAttrValue获取投影名称，可对应设置
// .SetTM 设置横轴墨卡托的 5 个参数，包含中央经线等
string tSrs;
double clong;
clong = spProj.GetProjParm(centralMeridian, clong);
spProj.GetAttrValue(projName,0)
spProj.ExportToWkt(out tSrs);var gdalWarpExe = System.IO.Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "gdalwarp.exe");
var startInfo = new ProcessStartInfo(gdalWarpExe)
{WindowStyle = ProcessWindowStyle.Normal,Arguments = string.Format("-t_srs {0}{1}{2} -r cubic -tr {3} {4} {5} {6} -co TILED=YES",'"', tSrs,'"', resolutoin, resolutoin, tifFi.FullName, System.IO.Path.Combine(tifPath, "B.TIF")),UseShellExecute = false,RedirectStandardOutput = true,CreateNoWindow = true
};
var process = new Process { StartInfo = startInfo };
process.Start();

参考文献
https://gdal.org/programs/gdalwarp.html
https://gdal.org/api/ogrspatialref.html

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