80 lines
2.5 KiB
Go
80 lines
2.5 KiB
Go
package imageproc
|
|
|
|
import "fmt"
|
|
|
|
func calculateProj(topLeftX, topLeftY, width, height, resolution float64) string {
|
|
// 计算图像的地理范围
|
|
bottomRightX := topLeftX + float64(width)*resolution
|
|
bottomRightY := topLeftY + float64(height)*resolution
|
|
|
|
// 根据地理范围和分辨率选择适当的投影信息
|
|
// 这里只是一个示例，你需要根据实际情况选择合适的投影系统和参数
|
|
projection := fmt.Sprintf(`PROJCS["Custom Projection",
|
|
GEOGCS["WGS 84",
|
|
DATUM["WGS_1984",
|
|
SPHEROID["WGS 84",6378137,298.257223563,
|
|
AUTHORITY["EPSG","7030"]],
|
|
AUTHORITY["EPSG","6326"]],
|
|
PRIMEM["Greenwich",0,
|
|
AUTHORITY["EPSG","8901"]],
|
|
UNIT["degree",0.0174532925199433,
|
|
AUTHORITY["EPSG","9122"]],
|
|
AUTHORITY["EPSG","4326"]],
|
|
PROJECTION["Transverse_Mercator"],
|
|
PARAMETER["latitude_of_origin",0],
|
|
PARAMETER["central_meridian",%f],
|
|
PARAMETER["scale_factor",0.9996],
|
|
PARAMETER["false_easting",%f],
|
|
PARAMETER["false_northing",0],
|
|
UNIT["metre",1,
|
|
AUTHORITY["EPSG","9001"]],
|
|
AXIS["Easting",EAST],
|
|
AXIS["Northing",NORTH]]`,
|
|
(topLeftX+bottomRightX)/2, (topLeftY+bottomRightY)/2)
|
|
|
|
projection = `PROJCS["WGS 84 / UTM zone 51N",
|
|
GEOGCS["WGS 84",
|
|
DATUM["WGS_1984",
|
|
SPHEROID["WGS 84",6378137,298.257223563,
|
|
AUTHORITY["EPSG","7030"]],
|
|
AUTHORITY["EPSG","6326"]],
|
|
PRIMEM["Greenwich",0,
|
|
AUTHORITY["EPSG","8901"]],
|
|
UNIT["degree",0.0174532925199433,
|
|
AUTHORITY["EPSG","9122"]],
|
|
AUTHORITY["EPSG","4326"]],
|
|
PROJECTION["Transverse_Mercator"],
|
|
PARAMETER["latitude_of_origin",0],
|
|
PARAMETER["central_meridian",123],
|
|
PARAMETER["scale_factor",0.9996],
|
|
PARAMETER["false_easting",500000],
|
|
PARAMETER["false_northing",0],
|
|
UNIT["metre",1,
|
|
AUTHORITY["EPSG","9001"]],
|
|
AXIS["Easting",EAST],
|
|
AXIS["Northing",NORTH],
|
|
AUTHORITY["EPSG","32651"]]`
|
|
|
|
projection = `PROJCS["WGS 84 / Pseudo-Mercator",
|
|
GEOGCS["WGS 84",DATUM["WGS_1984",
|
|
SPHEROID["WGS 84",6378137,298.257223563,
|
|
AUTHORITY["EPSG","7030"]],
|
|
AUTHORITY["EPSG","6326"]],
|
|
PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],
|
|
UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],
|
|
AUTHORITY["EPSG","4326"]],
|
|
PROJECTION["Mercator_1SP"],
|
|
PARAMETER["central_meridian",0],
|
|
PARAMETER["scale_factor",1],
|
|
PARAMETER["false_easting",0],
|
|
PARAMETER["false_northing",0],
|
|
UNIT["metre",1,AUTHORITY["EPSG","9001"]],
|
|
AXIS["X",EAST],
|
|
AXIS["Y",NORTH],
|
|
EXTENSION["PROJ4","+proj=merc +a=6378137 +b=6378137 +lat_ts=0.0 +lon_0=0.0 +x_0=0.0 +y_0=0 +k=1.0 +units=m +nadgrids=@null +wktext +no_defs"],
|
|
AUTHORITY["EPSG","3857"]]`
|
|
|
|
// 输出投影信息
|
|
return projection
|
|
}
|