我可以在Google Earth中看到多边形

Question

这是我用来生成.kml文件的代码：

def kmlForLab2():
    #XYpoints1_wgs84
    #XYpoints1_wgs84.csv
    
    #Input the file name."JoeDupes3_forearth"
    fname = input("Enter file name WITHOUT extension: ")
    data = csv.reader(open(fname + '.csv'), delimiter = ',')
    
    #Skip the 1st header row.
    #data.next()
    #Open the file to be written.
    f = open('Buffered_kml.kml', 'w')
    
    #Writing the kml file.
    f.write("<?xml version='1.0' encoding='UTF-8'?>\n")
    f.write("<kml xmlns='http://earth.google.com/kml/2.0'>\n")
    f.write("<Document>\n")
    f.write("<!-- first buffer -->")
    f.write("<Placemark>\n")
    f.write("   <name>" + fname + '.kml' +"</name>\n")
    f.write("   <Polygon> <outerBoundaryIs> <LinearRing>\n")
    f.write("           <coordinates>\n" )
    next(data)
    for row in data:
        f.write(str((row[1])) + "," + " "+ (str(row[2]))+"\n") 
    f.write("           </coordinates>\n" )
    f.write("   </LinearRing> </outerBoundaryIs> </Polygon> \n")
    f.write("</Placemark>\n")
    f.write("</Document>\n")
    f.write("</kml>\n")
    f.close()
    print ("File Created. ")
    print ("Press ENTER to exit. ")

它生成.kml文件，但它没有放大NZ内的多边形。发生了什么事？

Answer 1

文档的＆lt; coordinates＆gt;部分旨在包含逗号分隔的元组，每个元组与whitespace分开。因此，这样的：

-77.05788457660967,38.87253259892824,100
-77.05465973756702,38.87291016281703,100

或：

-77.05788457660967,38.87253259892824,100 -77.05465973756702,38.87291016281703,100

您的代码正在将空格插入坐标元组中间。给定的输入：

unknown column,lat,lon,ele
1,-77.05788457660967,38.87253259892824,100
2,-77.05465973756702,38.87291016281703,100
3,-77.05315536854791,38.87053267794386,100
4,-77.05552622493516,38.868757801256,100
5,-77.05844056290393,38.86996206506943,100
6,-77.05788457660967,38.87253259892824,100

您的代码生成以下＆lt; coordinates＆gt; e节：

<coordinates>
-77.05788457660967, 38.87253259892824
-77.05465973756702, 38.87291016281703
-77.05315536854791, 38.87053267794386
-77.05552622493516, 38.868757801256
-77.05844056290393, 38.86996206506943
-77.05788457660967, 38.87253259892824
</coordinates>

这不正确显示。但是，如果我们修改您的代码，以便
看起来这样：

    for row in data:
        f.write(str((row[1])) + "," + (str(row[2]))+"\n") 

或使用加入这样的：

    for row in data:
        f.write(",".join(str(x) for x in row[1:3]))
        f.write("\n")

我们得到：

<coordinates>
-77.05788457660967,38.87253259892824
-77.05465973756702,38.87291016281703
-77.05315536854791,38.87053267794386
-77.05552622493516,38.868757801256
-77.05844056290393,38.86996206506943
-77.05788457660967,38.87253259892824
</coordinates>

这在Google Earth中正确显示。