83 lines
2.9 KiB
Go
83 lines
2.9 KiB
Go
package producer
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import "fmt"
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func calculateProj(topLeftX, topLeftY, width, height, resolution float64) string {
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var projections []string
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// 计算图像的地理范围
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bottomRightX := topLeftX + float64(width)*resolution
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bottomRightY := topLeftY + float64(height)*resolution
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// 根据地理范围和分辨率选择适当的投影信息
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// 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
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projections = append(projections, fmt.Sprintf(`PROJCS["Custom Projection",
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GEOGCS["WGS 84",
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DATUM["WGS_1984",
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SPHEROID["WGS 84",6378137,298.257223563,
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AUTHORITY["EPSG","7030"]],
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AUTHORITY["EPSG","6326"]],
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PRIMEM["Greenwich",0,
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AUTHORITY["EPSG","8901"]],
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UNIT["degree",0.0174532925199433,
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AUTHORITY["EPSG","9122"]],
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AUTHORITY["EPSG","4326"]],
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PROJECTION["Transverse_Mercator"],
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PARAMETER["latitude_of_origin",0],
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PARAMETER["central_meridian",%f],
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PARAMETER["scale_factor",0.9996],
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PARAMETER["false_easting",%f],
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PARAMETER["false_northing",0],
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UNIT["metre",1,
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AUTHORITY["EPSG","9001"]],
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AXIS["Easting",EAST],
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AXIS["Northing",NORTH]]`,
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(topLeftX+bottomRightX)/2, (topLeftY+bottomRightY)/2))
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projections = append(projections, `PROJCS["WGS 84 / UTM zone 51N",
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GEOGCS["WGS 84",
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DATUM["WGS_1984",
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SPHEROID["WGS 84",6378137,298.257223563,
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AUTHORITY["EPSG","7030"]],
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AUTHORITY["EPSG","6326"]],
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PRIMEM["Greenwich",0,
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AUTHORITY["EPSG","8901"]],
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UNIT["degree",0.0174532925199433,
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AUTHORITY["EPSG","9122"]],
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AUTHORITY["EPSG","4326"]],
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PROJECTION["Transverse_Mercator"],
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PARAMETER["latitude_of_origin",0],
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PARAMETER["central_meridian",123],
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PARAMETER["scale_factor",0.9996],
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PARAMETER["false_easting",500000],
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PARAMETER["false_northing",0],
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UNIT["metre",1,
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AUTHORITY["EPSG","9001"]],
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AXIS["Easting",EAST],
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AXIS["Northing",NORTH],
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AUTHORITY["EPSG","32651"]]`)
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projections = append(projections, `PROJCS["WGS 84 / Pseudo-Mercator",
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GEOGCS["WGS 84",DATUM["WGS_1984",
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SPHEROID["WGS 84",6378137,298.257223563,
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AUTHORITY["EPSG","7030"]],
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AUTHORITY["EPSG","6326"]],
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PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],
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UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],
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AUTHORITY["EPSG","4326"]],
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PROJECTION["Mercator_1SP"],
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PARAMETER["central_meridian",0],
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PARAMETER["scale_factor",1],
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PARAMETER["false_easting",0],
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PARAMETER["false_northing",0],
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UNIT["metre",1,AUTHORITY["EPSG","9001"]],
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AXIS["X",EAST],
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AXIS["Y",NORTH],
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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"],
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AUTHORITY["EPSG","3857"]]`)
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projections = append(projections, `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"]],AXIS["Latitude",NORTH],AXIS["Longitude",EAST],AUTHORITY["EPSG","4326"]]`)
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// 输出投影信息
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return projections[4]
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}
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