使用“matplotlib.mlab.griddata”时程序挂起
我编写了一个脚本（Python 2.6）来以 x，y，z （.csv 格式）网格数据，并显示数据的等高线图。
该脚本适用于某些数据集，但不适用于其他数据集 - 即使这两个数据集是使用相同的脚本创建的。
要绘制的数据集是通过对主数据集进行二次采样而创建的。
以下是 every_4.csv 的示例（每 4 行对主数据集进行二次采样）。
Easting Northing TMI_nT
526243.0 5254128.9 62278.8
526259.4 5254128.9 62352.3
526275.9 5254128.9 62303.3
526292.3 5254128.9 62361.9
526308.8 5254128.9 62667.8
526325.2 5254128.9 62668.6
526341.7 5254128.9 61700.1
526358.1 5254128.9 62029.6
526374.6 5254128.9 62042.7
使用我的脚本可以正确绘制该数据。
“every_3.csv”与 every_4.csv 的形式相同，导致我的脚本在尝试执行时挂起（没有错误消息）：
zi = griddata(x, y, z, xi, yi)
这是我正在使用的脚本：
### program to test gridding and contouring
import numpy as N
import scipy as S
from matplotlib.mlab import griddata
import matplotlib.pyplot as P
import matplotlib.cm as CM
longarray = N.loadtxt('every_3.csv', skiprows=1, delimiter=',')
x = longarray[:,0]
y = longarray[:,1]
z = longarray[:,2]
max_x = max(x)
min_x = min(x)
max_y = max(y)
min_y = min(y)
##print max_y
##print min_x
##print max_x
##print min_y
xi = N.linspace(min_x, max_x)
yi = N.linspace(min_y, max_y)
zi = griddata(x, y, z, xi, yi)
print zi
CS = P.contourf(xi,yi,zi,15,cmap=CM.RdYlBu)
P.show()
我无法弄清楚为什么这个脚本对某些文件挂起，而对其他文件则挂起。
注意：如果我在 Excel 中打开 every_3.csv 并删除一些行（例如文件中 50% 的行），我可以让脚本运行...
更新
这是一个更完整的数据集：
Easting Northing TMI_nT
526243 5254128.9 62278.8
526247.1 5254128.9 62413.3
526251.2 5254128.9 62398.6
526255.3 5254128.9 62355.7
526259.4 5254128.9 62352.3
526263.6 5254128.9 62327.8
526267.7 5254128.9 62279.6
526271.8 5254128.9 62322.1
526275.9 5254128.9 62303.3
526280 5254128.9 62375.1
526284.1 5254128.9 62561.4
526288.2 5254128.9 62302.4
526292.3 5254128.9 62361.9
526374.6 5254128.9 62042.7
526378.7 5254128.9 62139.6
526382.8 5254128.9 61891.5
526386.9 5254128.9 61937.2
526391 5254128.9 62238.7
526395.1 5254128.9 62344.9
526399.2 5254128.9 62220.4
526403.3 5254128.9 62027
526407.4 5254128.9 62392.2
526411.6 5254128.9 63252.4
526415.7 5254128.9 62951.8
526419.8 5254128.9 62504.5
526423.9 5254128.9 62927.6
526428 5254128.9 62813.9
526432.1 5254128.9 63381.4
526436.2 5254128.9 63458.5
526440.3 5254128.9 63273
526444.4 5254128.9 62945
526448.6 5254128.9 62466.2
526452.7 5254128.9 62300.3
526456.8 5254128.9 62164.3
526460.9 5254128.9 62144.7
526465 5254128.9 62216.7
526469.1 5254128.9 62307.3
526473.2 5254128.9 62437.6
526477.3 5254128.9 62495
526481.4 5254128.9 62256.1
526485.6 5254128.9 61951.2
526489.7 5254128.9 61632
526493.8 5254128.9 61221.6
526497.9 5254128.9 62414.3
526502 5254128.9 64152.7
526506.1 5254128.9 61964.7
526510.2 5254128.9 61952.5
526514.3 5254128.9 62104.2
526518.4 5254128.9 62190.4
526522.6 5254128.9 62334.8
526526.7 5254128.9 62468.8
526530.8 5254128.9 62437.3
526296.4 5253951.8 62138
526300.6 5253951.8 62283.3
526304.7 5253951.8 62336
526308.8 5253951.8 62367.6
526312.9 5253951.8 62416
526317 5253951.8 62395.3
526321.1 5253951.8 62364.1
526325.2 5253951.8 62363.2
526329.3 5253951.8 62292.6
526333.4 5253951.8 62252
526337.6 5253951.8 62179.1
526341.7 5253951.8 62086.8
526345.8 5253951.8 62069.6
526349.9 5253951.8 62108.4
526354 5253951.8 61994
526358.1 5253951.8 61909.1
526362.2 5253951.8 61943.1
526366.3 5253951.8 61918.6
526370.4 5253951.8 61895.9
526374.6 5253951.8 61871.6
526378.7 5253951.8 61821.4
526382.8 5253951.8 61778.1
526386.9 5253951.8 61738.2
526391 5253951.8 61644.5
526395.1 5253951.8 61555.8
526399.2 5253951.8 61540
526403.3 5253951.8 61549.6
526407.4 5253951.8 61596.4
526411.6 5253951.8 61566.5
526415.7 5253951.8 61565.1
526419.8 5253951.8 61287.6
526423.9 5253951.8 61368
526428 5253951.8 61481.5
526432.1 5253951.8 61228.8
526436.2 5253951.8 61024.6
526440.3 5253951.8 60960.9
526444.4 5253951.8 61146.7
526448.6 5253951.8 61240.8
526452.7 5253951.8 61396.5
526456.8 5253951.8 61536.9
526460.9 5253951.8 61677.1
526465 5253951.8 61715.6
526469.1 5253951.8 61749.8
526473.2 5253951.8 61809.1
526477.3 5253951.8 61939.2
526481.4 5253951.8 61913.3
526485.6 5253951.8 62035.7
526489.7 5253951.8 62108.9
526493.8 5253951.8 62025.4
526497.9 5253951.8 61929.1
526502 5253951.8 61947.2
526506.1 5253951.8 62182.8
526510.2 5253951.8 62239.3
526514.3 5253951.8 62071.7
526518.4 5253951.8 62054.5
526522.6 5253951.8 62001.3
526526.7 5253951.8 61993.5
526530.8 5253951.8 62009.3
526534.9 5253951.8 61966.5
526539 5253951.8 61947.2
526543.1 5253951.8 61936.4
526547.2 5253951.8 61974
526551.3 5253951.8 62023.6
526555.4 5253951.8 62068.7
526559.6 5253951.8 62096.1
526563.7 5253951.8 62113.4
526567.8 5253951.8 62085.1
526571.9 5253951.8 62100.7
526576 5253951.8 62180.1
526580.1 5253951.8 62231.8
526584.2 5253951.8 62142.9
526588.3 5253951.8 62137.1
526592.4 5253951.8 62135.4
526596.6 5253951.8 62118.5
526600.7 5253951.8 62104.9
526604.8 5253951.8 62126.5
526608.9 5253951.8 62129.7
526613 5253951.8 62127
526617.1 5253951.8 62122.8
526621.2 5253951.8 62091.5
526625.3 5253951.8 62143.7
526629.4 5253951.8 62144.2
526633.6 5253951.8 62148.1
526637.7 5253951.8 62145.6
526641.8 5253951.8 62247.1
526645.9 5253951.8 62267.5
526650 5253951.8 62131.8
526243 5253955.9 62073.3
526247.1 5253955.9 62018.5
526251.2 5253955.9 61948.4
526255.3 5253955.9 61965.1
526259.4 5253955.9 61980.3
526263.6 5253955.9 61982.2
526267.7 5253955.9 61985.3
526271.8 5253955.9 61979.6
526275.9 5253955.9 61999.4
526280 5253955.9 62025.7
526284.1 5253955.9 62064.8
526288.2 5253955.9 62068.6
526292.3 5253955.9 62099.2
526296.4 5253955.9 62172.6
526300.6 5253955.9 62283.8
526304.7 5253955.9 62440.8
526308.8 5253955.9 62458.1
526312.9 5253955.9 62588.3
526317 5253955.9 62521.1
526321.1 5253955.9 62390.8
526325.2 5253955.9 62310.4
526329.3 5253955.9 62271
526333.4 5253955.9 62214.3
526337.6 5253955.9 62118.8
526341.7 5253955.9 62024.5
526345.8 5253955.9 61989.4
526349.9 5253955.9 61943.5
526354 5253955.9 61835.8
526506.1 5253955.9 61915.8
526510.2 5253955.9 62043
526514.3 5253955.9 62039.2
526518.4 5253955.9 62021.1
526522.6 5253955.9 62014
526526.7 5253955.9 61930.3
526530.8 5253955.9 61880.7
526534.9 5253955.9 61758.4
526539 5253955.9 61733.5
526543.1 5253955.9 61787.5
526547.2 5253955.9 61862.6
526551.3 5253955.9 61934.6
526555.4 5253955.9 61990.5
526559.6 5253955.9 62059.5
526563.7 5253955.9 62092
526567.8 5253955.9 62104.3
526571.9 5253955.9 62146.3
526576 5253955.9 62242.9
526580.1 5253955.9 62420.5
526584.2 5253955.9 62204.1
526588.3 5253955.9 62178.4
526592.4 5253955.9 62159
526596.6 5253955.9 62147.1
526600.7 5253955.9 62159.6
526604.8 5253955.9 62144.3
526608.9 5253955.9 62131.1
526613 5253955.9 62121.7
526617.1 5253955.9 62117.9
526621.2 5253955.9 62084.7
526625.3 5253955.9 62139.2
526629.4 5253955.9 62136.5
526633.6 5253955.9 62142
526637.7 5253955.9 62144.3
526641.8 5253955.9 62250.2
526645.9 5253955.9 62274.5
526650 5253955.9 62119
526243 5253960 62104
526247.1 5253960 62041.8
526251.2 5253960 61978.7
526255.3 5253960 61993.8
526259.4 5253960 61998.6
526263.6 5253960 61981
526267.7 5253960 61982
526271.8 5253960 61995.3
526275.9 5253960 62010.1
526280 5253960 62030.7
526284.1 5253960 62061.3
526288.2 5253960 62089.9
526292.3 5253960 62115.6
526296.4 5253960 62205.4
526300.6 5253960 62319.9
526304.7 5253960 62392.1
526308.8 5253960 62434.8
526312.9 5253960 62466.7
526317 5253960 62479.9
526321.1 5253960 62358.1
526325.2 5253960 62281.7
526329.3 5253960 62214.8
526333.4 5253960 62131.9
526382.8 5253960 61613.3
526386.9 5253960 61591.6
526391 5253960 61406.2
526395.1 5253960 61179.4
526399.2 5253960 61291.8
526403.3 5253960 61307.2
526407.4 5253960 61304.3
526411.6 5253960 61320.5
526415.7 5253960 61376.8
526419.8 5253960 61160.5
526423.9 5253960 61045.8
526428 5253960 61138.2
526432.1 5253960 61113.1
526436.2 5253960 60926.6
526440.3 5253960 60793.8
526444.4 5253960 60775.6
526448.6 5253960 60776.9
526452.7 5253960 60979.6
526456.8 5253960 61309.1
526460.9 5253960 61772.9
526465 5253960 61665.1
526469.1 5253960 61554.1
526473.2 5253960 61569.5
526477.3 5253960 61725.2
526481.4 5253960 61846
526485.6 5253960 61948.4
526489.7 5253960 61944.3
526493.8 5253960 61848
526497.9 5253960 61677.3
526502 5253960 61516.1
526506.1 5253960 61634.4
526510.2 5253960 61884.9
526514.3 5253960 61975.8
526518.4 5253960 61909.8
526522.6 5253960 61905.6
526526.7 5253960 61835
526530.8 5253960 61692.3
526534.9 5253960 61408.4
526539 5253960 61533.9
526543.1 5253960 61670.4
526547.2 5253960 61785.9
526551.3 5253960 61878.6
526555.4 5253960 61963.3
526559.6 5253960 62048.6
526563.7 5253960 62070.7
526567.8 5253960 62099.5
526571.9 5253960 62140.9
526576 5253960 62242.6
526580.1 5253960 62255
526584.2 5253960 62171.5
526588.3 5253960 62180.7
526592.4 5253960 62164.1
526596.6 5253960 62158.9
526600.7 5253960 62147.7
526604.8 5253960 62146.6
526608.9 5253960 62129
526613 5253960 62122.5
526617.1 5253960 62114.6
526621.2 5253960 62080.8
526625.3 5253960 62140.4
526629.4 5253960 62142.5
526633.6 5253960 62149.3
526637.7 5253960 62152
526641.8 5253960 62263.4
526645.9 5253960 62291.9
526650 5253960 62286.3
526243 5253964.1 62092
526247.1 5253964.1 62041.8
526251.2 5253964.1 61978.3
526255.3 5253964.1 62000.1
526259.4 5253964.1 62012.2
526263.6 5253964.1 62027.1
526267.7 5253964.1 62001.6
526271.8 5253964.1 62003.2
526275.9 5253964.1 61988.3
526280 5253964.1 62028.8
526284.1 5253964.1 62056.9
526288.2 5253964.1 62075.6
526292.3 5253964.1 62149.4
526296.4 5253964.1 62248
526300.6 5253964.1 62365.5
526555.4 5253964.1 61980.9
526559.6 5253964.1 62035.4
526563.7 5253964.1 62055.7
526567.8 5253964.1 62100.7
526571.9 5253964.1 62146.3
526576 5253964.1 62199
526580.1 5253964.1 62195.8
526584.2 5253964.1 62152.1
526588.3 5253964.1 62147.5
526592.4 5253964.1 62192.7
526596.6 5253964.1 62123.1
526600.7 5253964.1 62114
526604.8 5253964.1 62115.9
526608.9 5253964.1 62108.7
526613 5253964.1 62106.3
526617.1 5253964.1 62101.6
526621.2 5253964.1 62065.8
526625.3 5253964.1 62131
526629.4 5253964.1 62133.5
526633.6 5253964.1 62139.8
526637.7 5253964.1 62143
526641.8 5253964.1 62245.9
526645.9 5253964.1 62265.8
526650 5253964.1 62302.6
526243 5253968.3 62086
526247.1 5253968.3 62035.9
526251.2 5253968.3 61980
526255.3 5253968.3 61995.1
526259.4 5253968.3 62021.7
526263.6 5253968.3 62012.6
526267.7 5253968.3 61992.3
526271.8 5253968.3 62024.4
526275.9 5253968.3 61968.1
526280 5253968.3 62030.8
526284.1 5253968.3 62045.5
526288.2 5253968.3 62092.9
526292.3 5253968.3 62189.2
526296.4 5253968.3 62316.8
526300.6 5253968.3 62476.9
526304.7 5253968.3 62513.2
526308.8 5253968.3 62437.8
526312.9 5253968.3 62356.8
526317 5253968.3 62305.8
526321.1 5253968.3 62248.8
526325.2 5253968.3 62187.3
526329.3 5253968.3 62115.2
526333.4 5253968.3 62031
526337.6 5253968.3 62028.7
526341.7 5253968.3 61980.8
526345.8 5253968.3 61979.9
526349.9 5253968.3 61825.2
526354 5253968.3 61721.9
526358.1 5253968.3 61733.8
526362.2 5253968.3 61654.4
526366.3 5253968.3 61493.2
526370.4 5253968.3 61363.9
526374.6 5253968.3 61270.6
526378.7 5253968.3 61302.3
526382.8 5253968.3 61352.9
526386.9 5253968.3 61309
526391 5253968.3 61151.5
526395.1 5253968.3 60971.2
526399.2 5253968.3 60867.7
526403.3 5253968.3 60888.3
526407.4 5253968.3 60935
526411.6 5253968.3 60938.5
526415.7 5253968.3 61003.7
526419.8 5253968.3 61103.4
526423.9 5253968.3 60876.9
526428 5253968.3 60551.8
526432.1 5253968.3 60572.6
526436.2 5253968.3 60717
526440.3 5253968.3 60755.9
526444.4 5253968.3 60572.4
526448.6 5253968.3 60121.9
526563.7 5253968.3 62039.3
526567.8 5253968.3 62088.7
526571.9 5253968.3 62134.1
526576 5253968.3 62154.3
526580.1 5253968.3 62181.4
526584.2 5253968.3 62209.6
526588.3 5253968.3 62200.7
526592.4 5253968.3 62210.8
526596.6 5253968.3 62184.9
526600.7 5253968.3 62175.3
526604.8 5253968.3 62120.9
526608.9 5253968.3 62105.4
526613 5253968.3 62100.4
526617.1 5253968.3 62089.4
526621.2 5253968.3 62048.4
526625.3 5253968.3 62109.9
526629.4 5253968.3 62118.6
526633.6 5253968.3 62114.2
526637.7 5253968.3 62122.6
526641.8 5253968.3 62244.9
526645.9 5253968.3 62267.5
526650 5253968.3 62310.7
526243 5253972.4 62069.2
526247.1 5253972.4 62038.8
526251.2 5253972.4 62000.6
526255.3 5253972.4 62021.2
526259.4 5253972.4 62007
526263.6 5253972.4 62003.1
526267.7 5253972.4 62021.6
526271.8 5253972.4 62052.7
526275.9 5253972.4 62073.4
526280 5253972.4 62056.2
526284.1 5253972.4 62089.7
526288.2 5253972.4 62148.2
526292.3 5253972.4 62244.1
526296.4 5253972.4 62372
526300.6 5253972.4 62451.7
526304.7 5253972.4 62476
526308.8 5253972.4 62392.1
526312.9 5253972.4 62354.4
526317 5253972.4 62276.2
526321.1 5253972.4 62209.1
526325.2 5253972.4 62164.2
526329.3 5253972.4 62089.1
526333.4 5253972.4 62038.1
526337.6 5253972.4 61983.1
526341.7 5253972.4 61910.2
526345.8 5253972.4 61794.9
526349.9 5253972.4 61654
526354 5253972.4 61547
526358.1 5253972.4 61532.1
526362.2 5253972.4 61464.3
526366.3 5253972.4 61343.5
526370.4 5253972.4 61173
526374.6 5253972.4 61061.3
526378.7 5253972.4 61041.7
526382.8 5253972.4 61234.2
526386.9 5253972.4 61196.5
526391 5253972.4 61047.1
526395.1 5253972.4 60856.4
526399.2 5253972.4 60764.9
526403.3 5253972.4 60778.6
526407.4 5253972.4 60836.6
526411.6 5253972.4 60887.4
526415.7 5253972.4 61012
526419.8 5253972.4 61134.9
526423.9 5253972.4 60972.7
526428 5253972.4 60599.3
526432.1 5253972.4 60154.9
526436.2 5253972.4 60802.8
526440.3 5253972.4 60958.2
526444.4 5253972.4 60530.1
526448.6 5253972.4 60229.9
526452.7 5253972.4 60197.6
526456.8 5253972.4 60425.8
526460.9 5253972.4 60450.8
526465 5253972.4 59787.6
526469.1 5253972.4 59404.4
526473.2 5253972.4 60447.7
526477.3 5253972.4 61011.9
526481.4 5253972.4 61304
526485.6 5253972.4 61404
526489.7 5253972.4 61431.8
526493.8 5253972.4 61455.5
526497.9 5253972.4 61489.8
526502 5253972.4 61445.9
526506.1 5253972.4 61581.3
526510.2 5253972.4 61723.1
526514.3 5253972.4 61744.5
526518.4 5253972.4 61759.3
526522.6 5253972.4 61651.6
526526.7 5253972.4 61357.4
526530.8 5253972.4 61088.1
526534.9 5253972.4 61505.6
526539 5253972.4 61793.5
526543.1 5253972.4 61846.8
526547.2 5253972.4 61890.7
526551.3 5253972.4 61929
526555.4 5253972.4 61953.5
526559.6 5253972.4 62004
526563.7 5253972.4 62017.1
526567.8 5253972.4 62069.5
526571.9 5253972.4 62119.6
526576 5253972.4 62142.3
526580.1 5253972.4 62190.1
526584.2 5253972.4 62239.9
526588.3 5253972.4 62268.3
526592.4 5253972.4 62257.5
526596.6 5253972.4 62212.8
526600.7 5253972.4 62193.3
526604.8 5253972.4 62137
526608.9 5253972.4 62084.3
526613 5253972.4 62075.9
526617.1 5253972.4 62072.8
526621.2 5253972.4 62030.6
526625.3 5253972.4 62100.9
526629.4 5253972.4 62107.4
526633.6 5253972.4 62124.6
526637.7 5253972.4 62140.9
526641.8 5253972.4 62249.8
526645.9 5253972.4 62275.2
526650 5253972.4 62325
526243 5253976.5 62069.2
526247.1 5253976.5 62037.5
526251.2 5253976.5 61984.2
526255.3 5253976.5 62000.4
526259.4 5253976.5 62020.3
526263.6 5253976.5 62019.6
526267.7 5253976.5 62028.1
526271.8 5253976.5 62079.9
526275.9 5253976.5 62095.9
526280 5253976.5 62084.5
526284.1 5253976.5 62129.4
526288.2 5253976.5 62203.6
526292.3 5253976.5 62304.3
526296.4 5253976.5 62380.6
526300.6 5253976.5 62398
526304.7 5253976.5 62358.6
526308.8 5253976.5 62323.8
526312.9 5253976.5 62283
526317 5253976.5 62240.6
526321.1 5253976.5 62175.5
526325.2 5253976.5 62113.9
526329.3 5253976.5 62021.2
526333.4 5253976.5 61958.1
526337.6 5253976.5 61902.3
526341.7 5253976.5 61846.7
526345.8 5253976.5 61647.2
526349.9 5253976.5 61442.7
526354 5253976.5 61346.2
526358.1 5253976.5 61387.1
526362.2 5253976.5 61324.2
526366.3 5253976.5 61168.7
526370.4 5253976.5 61043.5
526374.6 5253976.5 60854.9
526378.7 5253976.5 60797.1
526382.8 5253976.5 60889.2
526386.9 5253976.5 60915.6
526391 5253976.5 60822.2
526395.1 5253976.5 60760.4
526399.2 5253976.5 60700.1
526403.3 5253976.5 60540.3
526407.4 5253976.5 60525.5
526411.6 5253976.5 60693.8
526415.7 5253976.5 60905.6
526419.8 5253976.5 61065.2
526423.9 5253976.5 60992.9
526428 5253976.5 60873.2
526432.1 5253976.5 60135.2
526436.2 5253976.5 60421.8
526440.3 5253976.5 60699.9
526444.4 5253976.5 60422.8
526448.6 5253976.5 60075.5
526452.7 5253976.5 59948.4
526456.8 5253976.5 60170.3
526460.9 5253976.5 60534
526465 5253976.5 59849.7
526469.1 5253976.5 59221.9
526473.2 5253976.5 59961.2
526477.3 5253976.5 60589
526481.4 5253976.5 60958.8
526485.6 5253976.5 61166
526489.7 5253976.5 61296.1
526493.8 5253976.5 61335.3
526497.9 5253976.5 61448
526502 5253976.5 61423.1
526506.1 5253976.5 61574.7
526510.2 5253976.5 61769.1
526514.3 5253976.5 61774.9
526518.4 5253976.5 61847.8
526522.6 5253976.5 61888.6
526526.7 5253976.5 61915.7
526530.8 5253976.5 61965.2
526534.9 5253976.5 61939
526539 5253976.5 61954.5
526543.1 5253976.5 61935.2
526547.2 5253976.5 61942.9
526551.3 5253976.5 61951.1
526555.4 5253976.5 61998.7
526559.6 5253976.5 61981.4
526563.7 5253976.5 61991.2
526567.8 5253976.5 62052.1
526571.9 5253976.5 62141.2
526576 5253976.5 62167.5
526580.1 5253976.5 62175.5
526584.2 5253976.5 62277.2
526588.3 5253976.5 62363.1
526592.4 5253976.5 62262.3
526596.6 5253976.5 62178.3
526600.7 5253976.5 62151.2
526604.8 5253976.5 62143.3
526608.9 5253976.5 62092.3
526613 5253976.5 62073.4
526617.1 5253976.5 62072.3
526621.2 5253976.5 62030.2
526625.3 5253976.5 62096.5
526629.4 5253976.5 62110.7
526633.6 5253976.5 62115.6
526637.7 5253976.5 62139
526641.8 5253976.5 62251.8
526645.9 5253976.5 62277.1
526650 5253976.5 62337.3
526243 5253980.6 62066.3
526247.1 5253980.6 62048
526251.2 5253980.6 62002.1
526255.3 5253980.6 62005.9
526259.4 5253980.6 62016.9
526263.6 5253980.6 62024
526267.7 5253980.6 62054.9
526271.8 5253980.6 62109.2
526275.9 5253980.6 62090.7
526280 5253980.6 62121.7
526284.1 5253980.6 62169.8
526288.2 5253980.6 62245.1
526292.3 5253980.6 62311.2
526296.4 5253980.6 62336.4
526300.6 5253980.6 62305.7
526304.7 5253980.6 62294.3
526308.8 5253980.6 62252.1
526312.9 5253980.6 62203
526317 5253980.6 62172.3
526321.1 5253980.6 62097.8
526325.2 5253980.6 62031.2
526329.3 5253980.6 61944.4
526333.4 5253980.6 61889.2
526337.6 5253980.6 61820.7
526341.7 5253980.6 61742.6
526345.8 5253980.6 61514
526349.9 5253980.6 61344.2
526354 5253980.6 61245.2
526358.1 5253980.6 61238.2
526362.2 5253980.6 61181.5
526366.3 5253980.6 61034
526370.4 5253980.6 60946.3
526374.6 5253980.6 60761.3
526378.7 5253980.6 60579.3
526382.8 5253980.6 60575.5
526386.9 5253980.6 60797.7
526391 5253980.6 60773.6
526395.1 5253980.6 60771.5
526399.2 5253980.6 60727.6
526403.3 5253980.6 60545.5
526407.4 5253980.6 60405.8
526411.6 5253980.6 60482.8
526415.7 5253980.6 60903.6
526419.8 5253980.6 61087.6
526423.9 5253980.6 61206.6
526428 5253980.6 61175.3
526432.1 5253980.6 60749.5
526436.2 5253980.6 60558.7
526440.3 5253980.6 60418
526444.4 5253980.6 60293.5
526448.6 5253980.6 60012
526452.7 5253980.6 59445.5
526456.8 5253980.6 59617.3
526460.9 5253980.6 60258.1
526465 5253980.6 60222.1
526469.1 5253980.6 59939.5
526473.2 5253980.6 60081.4
526477.3 5253980.6 60348.9
526481.4 5253980.6 60695.2
526485.6 5253980.6 60930.1
526489.7 5253980.6 61133.6
526493.8 5253980.6 61264.2
526497.9 5253980.6 61349.5
526502 5253980.6 61355.8
526506.1 5253980.6 61398.3
526510.2 5253980.6 61698.9
526514.3 5253980.6 61786.7
526518.4 5253980.6 61866.2
526522.6 5253980.6 62075.3
526526.7 5253980.6 62405.3
526530.8 5253980.6 62759.8
526534.9 5253980.6 62307.7
526539 5253980.6 62091.4
526543.1 5253980.6 61996.8
526547.2 5253980.6 61953.2
526551.3 5253980.6 61935.6
526555.4 5253980.6 61932.6
526559.6 5253980.6 61922.5
526563.7 5253980.6 61940.6
526567.8 5253980.6 61991.2
526571.9 5253980.6 62040.7
526576 5253980.6 62075.9
526580.1 5253980.6 62104.3
526584.2 5253980.6 62151.5
526588.3 5253980.6 62193.7
526592.4 5253980.6 62166.6
526596.6 5253980.6 62121.4
526600.7 5253980.6 62098.5
526604.8 5253980.6 62100
526608.9 5253980.6 62070.9
526613 5253980.6 62061.9
526617.1 5253980.6 62064.2
526621.2 5253980.6 62018.3
526625.3 5253980.6 62088.8
526629.4 5253980.6 62102.2
526633.6 5253980.6 62107.7
526637.7 5253980.6 62133.7
526641.8 5253980.6 62251.3
526645.9 5253980.6 62280.6
526650 5253980.6 62348
526243 5253984.7 62070.5
526247.1 5253984.7 62032.9
526251.2 5253984.7 61995.8
526255.3 5253984.7 62013.9
526259.4 5253984.7 62021.1
526263.6 5253984.7 62031.5
526267.7 5253984.7 62062.8
526271.8 5253984.7 62111.6
526275.9 5253984.7 62114.9
526280 5253984.7 62139
526284.1 5253984.7 62200.9
526288.2 5253984.7 62248.8
526292.3 5253984.7 62278.6
526296.4 5253984.7 62268.5
526300.6 5253984.7 62259.9
526304.7 5253984.7 62234.8
526308.8 5253984.7 62189.8
526312.9 5253984.7 62159.2
526317 5253984.7 62085
526321.1 5253984.7 62005
526325.2 5253984.7 61934.3
526329.3 5253984.7 61855.4
526333.4 5253984.7 61811.4
526337.6 5253984.7 61785.8
526341.7 5253984.7 61567.1
526345.8 5253984.7 61412.7
526349.9 5253984.7 61300.2
526354 5253984.7 61168
526358.1 5253984.7 61129.6
526362.2 5253984.7 61029.5
526366.3 5253984.7 60792.3
526370.4 5253984.7 60739
526374.6 5253984.7 60601.2
526378.7 5253984.7 60352.3
526382.8 5253984.7 60250.4
526386.9 5253984.7 60371.7
526391 5253984.7 60576.7
526395.1 5253984.7 60709.4
526399.2 5253984.7 60647.8
526403.3 5253984.7 60407.7
526407.4 5253984.7 60270.3
526411.6 5253984.7 60235.8
526415.7 5253984.7 60576.9
526419.8 5253984.7 60782.5
526423.9 5253984.7 61177.2
526428 5253984.7 61308.1
526432.1 5253984.7 61268.4
526436.2 5253984.7 60831.1
526440.3 5253984.7 60244.9
526444.4 5253984.7 60060.9
526448.6 5253984.7 60139.4
526452.7 5253984.7 59810.3
526456.8 5253984.7 59954
526460.9 5253984.7 60277.9
526465 5253984.7 60327.2
526469.1 5253984.7 60454.4
526473.2 5253984.7 60387.6
526477.3 5253984.7 60202.1
526481.4 5253984.7 60292.2
526485.6 5253984.7 60657.1
526489.7 5253984.7 60909
526493.8 5253984.7 61070.8
526497.9 5253984.7 61128.9
526502 5253984.7 61233.6
526506.1 5253984.7 61286.2
526510.2 5253984.7 61543.5
526514.3 5253984.7 61691.4
526518.4 5253984.7 61822.6
526522.6 5253984.7 62016.1
526526.7 5253984.7 62274.3
526530.8 5253984.7 62299.4
526534.9 5253984.7 62263.7
526539 5253984.7 62161.4
526543.1 5253984.7 62070.3
526547.2 5253984.7 61992.3
526551.3 5253984.7 61919.4
526555.4 5253984.7 61842.4
526559.6 5253984.7 61810.8
526563.7 5253984.7 61862.3
526567.8 5253984.7 61926.4
526571.9 5253984.7 61919
526576 5253984.7 61948.4
526580.1 5253984.7 61989.3
526584.2 5253984.7 62017
526588.3 5253984.7 62065.8
526592.4 5253984.7 62058.4
526596.6 5253984.7 62053.2
526600.7 5253984.7 62041.8
526604.8 5253984.7 62066.9
526608.9 5253984.7 62072.8
526613 5253984.7 62072.4
526617.1 5253984.7 62055.3
对未对齐的条目表示抱歉，这是从 MS Excel 中复制出来的...
数据被排列为一系列行，这些行组合起来构成了一个坐标列表，该列表来自于上、下边界区域上的网格。降低大多数点的“x”和“y”值。
导致我的脚本挂起的问题是子采样数据集（我试图对其进行网格化以便将其计数图像与主数据集进行比较）的线起点和终点未对齐。对于使用奇数子间隔创建的所有子采样数据集都是如此。
我通过在“for”循环中使用额外的检查来对数据集进行二次采样来解决这个问题。
这是固定的“子样本”代码。
- Note: The plotting code works seamlessly.
def sub_sample():
print ""
print " - This program will sub-sample a dataset for every <n> datapoint."
print " - <n> should realistically should be between 1 and 10."
print " - If <n> > 10, interpretation confidence is reduced significantly."
print ""
n = raw_input(" - What value should <n> take?: ")
if int(n) > 0 and int(n) < 2001:
print ""
print " - You have chosen to subsample the data every "+str(n)+" datapoints."
perc = (float(1)/float(n)*int(100))
print " - This corresponds to "+str(perc)+" percent of the data."
indataarray = numpy.loadtxt("out.csv", skiprows=1, delimiter=',')
out_name = "every_"+str(n)+".csv"
t = indataarray.shape
totalrows = t[0]
totalcolumns = t[1]
holding_array = numpy.zeros( [totalrows, totalcolumns] )
for i in range(totalrows):
if ((i % 100) % int(n) == 0):
for j in range(totalcolumns):
holding_array[i,j] = indataarray[i,j]
no_zeros = (holding_array == 0).sum(1)
new_holding = holding_array[no_zeros == 0, :]
numpy.savetxt(out_name, new_holding, delimiter=',', fmt='%f')
hdr_c1 = 'Easting,'
hdr_c2 = 'Northing,'
hdr_c3 = 'TMI_nT'
f = open(out_name)
text = f.read()
f.close()
f = open(out_name, 'w')
f.write(hdr_c1+hdr_c2+hdr_c3+'\n')
f.write(text)
f.close
print " - The file "+out_name+" has been created."
else:
print ""
print " - You have entered an unrealistic value for <n>."
print " - Please try again."
sub_sample()
I have written a script (Python 2.6) to grid data in x,y,z (.csv format), and display a contour plot of the data.
The script works for some datasets but not others - even though both datasets were created using the same script.
The datasets to be plotted are created by sub-sampling from a master dataset.
Here is an example of every_4.csv (master dataset sub-sampled for every 4 rows).
Easting Northing TMI_nT
526243.0 5254128.9 62278.8
526259.4 5254128.9 62352.3
526275.9 5254128.9 62303.3
526292.3 5254128.9 62361.9
526308.8 5254128.9 62667.8
526325.2 5254128.9 62668.6
526341.7 5254128.9 61700.1
526358.1 5254128.9 62029.6
526374.6 5254128.9 62042.7
This data plots correctly using my script.
"every_3.csv" Which is of the same form as every_4.csv causes my script to hang (no error message) when it tries to execute:
zi = griddata(x, y, z, xi, yi)
here is the script I am using:
### program to test gridding and contouring
import numpy as N
import scipy as S
from matplotlib.mlab import griddata
import matplotlib.pyplot as P
import matplotlib.cm as CM
longarray = N.loadtxt('every_3.csv', skiprows=1, delimiter=',')
x = longarray[:,0]
y = longarray[:,1]
z = longarray[:,2]
max_x = max(x)
min_x = min(x)
max_y = max(y)
min_y = min(y)
##print max_y
##print min_x
##print max_x
##print min_y
xi = N.linspace(min_x, max_x)
yi = N.linspace(min_y, max_y)
zi = griddata(x, y, z, xi, yi)
print zi
CS = P.contourf(xi,yi,zi,15,cmap=CM.RdYlBu)
P.show()
I cannot work out why this script hangs for some files and not others.
Note: If I open every_3.csv in excel and delete some rows (say 50% of the rows in the file) I can get the script to run...
Update
Here is a more complete data set:
Easting Northing TMI_nT
526243 5254128.9 62278.8
526247.1 5254128.9 62413.3
526251.2 5254128.9 62398.6
526255.3 5254128.9 62355.7
526259.4 5254128.9 62352.3
526263.6 5254128.9 62327.8
526267.7 5254128.9 62279.6
526271.8 5254128.9 62322.1
526275.9 5254128.9 62303.3
526280 5254128.9 62375.1
526284.1 5254128.9 62561.4
526288.2 5254128.9 62302.4
526292.3 5254128.9 62361.9
526374.6 5254128.9 62042.7
526378.7 5254128.9 62139.6
526382.8 5254128.9 61891.5
526386.9 5254128.9 61937.2
526391 5254128.9 62238.7
526395.1 5254128.9 62344.9
526399.2 5254128.9 62220.4
526403.3 5254128.9 62027
526407.4 5254128.9 62392.2
526411.6 5254128.9 63252.4
526415.7 5254128.9 62951.8
526419.8 5254128.9 62504.5
526423.9 5254128.9 62927.6
526428 5254128.9 62813.9
526432.1 5254128.9 63381.4
526436.2 5254128.9 63458.5
526440.3 5254128.9 63273
526444.4 5254128.9 62945
526448.6 5254128.9 62466.2
526452.7 5254128.9 62300.3
526456.8 5254128.9 62164.3
526460.9 5254128.9 62144.7
526465 5254128.9 62216.7
526469.1 5254128.9 62307.3
526473.2 5254128.9 62437.6
526477.3 5254128.9 62495
526481.4 5254128.9 62256.1
526485.6 5254128.9 61951.2
526489.7 5254128.9 61632
526493.8 5254128.9 61221.6
526497.9 5254128.9 62414.3
526502 5254128.9 64152.7
526506.1 5254128.9 61964.7
526510.2 5254128.9 61952.5
526514.3 5254128.9 62104.2
526518.4 5254128.9 62190.4
526522.6 5254128.9 62334.8
526526.7 5254128.9 62468.8
526530.8 5254128.9 62437.3
526296.4 5253951.8 62138
526300.6 5253951.8 62283.3
526304.7 5253951.8 62336
526308.8 5253951.8 62367.6
526312.9 5253951.8 62416
526317 5253951.8 62395.3
526321.1 5253951.8 62364.1
526325.2 5253951.8 62363.2
526329.3 5253951.8 62292.6
526333.4 5253951.8 62252
526337.6 5253951.8 62179.1
526341.7 5253951.8 62086.8
526345.8 5253951.8 62069.6
526349.9 5253951.8 62108.4
526354 5253951.8 61994
526358.1 5253951.8 61909.1
526362.2 5253951.8 61943.1
526366.3 5253951.8 61918.6
526370.4 5253951.8 61895.9
526374.6 5253951.8 61871.6
526378.7 5253951.8 61821.4
526382.8 5253951.8 61778.1
526386.9 5253951.8 61738.2
526391 5253951.8 61644.5
526395.1 5253951.8 61555.8
526399.2 5253951.8 61540
526403.3 5253951.8 61549.6
526407.4 5253951.8 61596.4
526411.6 5253951.8 61566.5
526415.7 5253951.8 61565.1
526419.8 5253951.8 61287.6
526423.9 5253951.8 61368
526428 5253951.8 61481.5
526432.1 5253951.8 61228.8
526436.2 5253951.8 61024.6
526440.3 5253951.8 60960.9
526444.4 5253951.8 61146.7
526448.6 5253951.8 61240.8
526452.7 5253951.8 61396.5
526456.8 5253951.8 61536.9
526460.9 5253951.8 61677.1
526465 5253951.8 61715.6
526469.1 5253951.8 61749.8
526473.2 5253951.8 61809.1
526477.3 5253951.8 61939.2
526481.4 5253951.8 61913.3
526485.6 5253951.8 62035.7
526489.7 5253951.8 62108.9
526493.8 5253951.8 62025.4
526497.9 5253951.8 61929.1
526502 5253951.8 61947.2
526506.1 5253951.8 62182.8
526510.2 5253951.8 62239.3
526514.3 5253951.8 62071.7
526518.4 5253951.8 62054.5
526522.6 5253951.8 62001.3
526526.7 5253951.8 61993.5
526530.8 5253951.8 62009.3
526534.9 5253951.8 61966.5
526539 5253951.8 61947.2
526543.1 5253951.8 61936.4
526547.2 5253951.8 61974
526551.3 5253951.8 62023.6
526555.4 5253951.8 62068.7
526559.6 5253951.8 62096.1
526563.7 5253951.8 62113.4
526567.8 5253951.8 62085.1
526571.9 5253951.8 62100.7
526576 5253951.8 62180.1
526580.1 5253951.8 62231.8
526584.2 5253951.8 62142.9
526588.3 5253951.8 62137.1
526592.4 5253951.8 62135.4
526596.6 5253951.8 62118.5
526600.7 5253951.8 62104.9
526604.8 5253951.8 62126.5
526608.9 5253951.8 62129.7
526613 5253951.8 62127
526617.1 5253951.8 62122.8
526621.2 5253951.8 62091.5
526625.3 5253951.8 62143.7
526629.4 5253951.8 62144.2
526633.6 5253951.8 62148.1
526637.7 5253951.8 62145.6
526641.8 5253951.8 62247.1
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526592.4 5253980.6 62166.6
526596.6 5253980.6 62121.4
526600.7 5253980.6 62098.5
526604.8 5253980.6 62100
526608.9 5253980.6 62070.9
526613 5253980.6 62061.9
526617.1 5253980.6 62064.2
526621.2 5253980.6 62018.3
526625.3 5253980.6 62088.8
526629.4 5253980.6 62102.2
526633.6 5253980.6 62107.7
526637.7 5253980.6 62133.7
526641.8 5253980.6 62251.3
526645.9 5253980.6 62280.6
526650 5253980.6 62348
526243 5253984.7 62070.5
526247.1 5253984.7 62032.9
526251.2 5253984.7 61995.8
526255.3 5253984.7 62013.9
526259.4 5253984.7 62021.1
526263.6 5253984.7 62031.5
526267.7 5253984.7 62062.8
526271.8 5253984.7 62111.6
526275.9 5253984.7 62114.9
526280 5253984.7 62139
526284.1 5253984.7 62200.9
526288.2 5253984.7 62248.8
526292.3 5253984.7 62278.6
526296.4 5253984.7 62268.5
526300.6 5253984.7 62259.9
526304.7 5253984.7 62234.8
526308.8 5253984.7 62189.8
526312.9 5253984.7 62159.2
526317 5253984.7 62085
526321.1 5253984.7 62005
526325.2 5253984.7 61934.3
526329.3 5253984.7 61855.4
526333.4 5253984.7 61811.4
526337.6 5253984.7 61785.8
526341.7 5253984.7 61567.1
526345.8 5253984.7 61412.7
526349.9 5253984.7 61300.2
526354 5253984.7 61168
526358.1 5253984.7 61129.6
526362.2 5253984.7 61029.5
526366.3 5253984.7 60792.3
526370.4 5253984.7 60739
526374.6 5253984.7 60601.2
526378.7 5253984.7 60352.3
526382.8 5253984.7 60250.4
526386.9 5253984.7 60371.7
526391 5253984.7 60576.7
526395.1 5253984.7 60709.4
526399.2 5253984.7 60647.8
526403.3 5253984.7 60407.7
526407.4 5253984.7 60270.3
526411.6 5253984.7 60235.8
526415.7 5253984.7 60576.9
526419.8 5253984.7 60782.5
526423.9 5253984.7 61177.2
526428 5253984.7 61308.1
526432.1 5253984.7 61268.4
526436.2 5253984.7 60831.1
526440.3 5253984.7 60244.9
526444.4 5253984.7 60060.9
526448.6 5253984.7 60139.4
526452.7 5253984.7 59810.3
526456.8 5253984.7 59954
526460.9 5253984.7 60277.9
526465 5253984.7 60327.2
526469.1 5253984.7 60454.4
526473.2 5253984.7 60387.6
526477.3 5253984.7 60202.1
526481.4 5253984.7 60292.2
526485.6 5253984.7 60657.1
526489.7 5253984.7 60909
526493.8 5253984.7 61070.8
526497.9 5253984.7 61128.9
526502 5253984.7 61233.6
526506.1 5253984.7 61286.2
526510.2 5253984.7 61543.5
526514.3 5253984.7 61691.4
526518.4 5253984.7 61822.6
526522.6 5253984.7 62016.1
526526.7 5253984.7 62274.3
526530.8 5253984.7 62299.4
526534.9 5253984.7 62263.7
526539 5253984.7 62161.4
526543.1 5253984.7 62070.3
526547.2 5253984.7 61992.3
526551.3 5253984.7 61919.4
526555.4 5253984.7 61842.4
526559.6 5253984.7 61810.8
526563.7 5253984.7 61862.3
526567.8 5253984.7 61926.4
526571.9 5253984.7 61919
526576 5253984.7 61948.4
526580.1 5253984.7 61989.3
526584.2 5253984.7 62017
526588.3 5253984.7 62065.8
526592.4 5253984.7 62058.4
526596.6 5253984.7 62053.2
526600.7 5253984.7 62041.8
526604.8 5253984.7 62066.9
526608.9 5253984.7 62072.8
526613 5253984.7 62072.4
526617.1 5253984.7 62055.3
Sorry about the miss-aligned entries, this comes from copying out of MS Excel...
The data is arranged as a series of lines which when combined constitute a list of co-ordinates from a grid over an area bounded by the upper and lower most points' 'x' and 'y' values.
The problem which caused my script to hang was that the sub-sampled data set, which I was trying to grid in order to compare a countour image of it with the master dataset, had mis-aligned line start and end points. This was true for all sub-sampled datasets which were created using a sub interval of an odd number.
I fixed the problem by using an additional check in a 'for' loop which sub-sampled the dataset.
Here is the fixed 'sub-sample' code.
- Note: The plotting code works seamlessly.
def sub_sample():
print ""
print " - This program will sub-sample a dataset for every <n> datapoint."
print " - <n> should realistically should be between 1 and 10."
print " - If <n> > 10, interpretation confidence is reduced significantly."
print ""
n = raw_input(" - What value should <n> take?: ")
if int(n) > 0 and int(n) < 2001:
print ""
print " - You have chosen to subsample the data every "+str(n)+" datapoints."
perc = (float(1)/float(n)*int(100))
print " - This corresponds to "+str(perc)+" percent of the data."
indataarray = numpy.loadtxt("out.csv", skiprows=1, delimiter=',')
out_name = "every_"+str(n)+".csv"
t = indataarray.shape
totalrows = t[0]
totalcolumns = t[1]
holding_array = numpy.zeros( [totalrows, totalcolumns] )
for i in range(totalrows):
if ((i % 100) % int(n) == 0):
for j in range(totalcolumns):
holding_array[i,j] = indataarray[i,j]
no_zeros = (holding_array == 0).sum(1)
new_holding = holding_array[no_zeros == 0, :]
numpy.savetxt(out_name, new_holding, delimiter=',', fmt='%f')
hdr_c1 = 'Easting,'
hdr_c2 = 'Northing,'
hdr_c3 = 'TMI_nT'
f = open(out_name)
text = f.read()
f.close()
f = open(out_name, 'w')
f.write(hdr_c1+hdr_c2+hdr_c3+'\n')
f.write(text)
f.close
print " - The file "+out_name+" has been created."
else:
print ""
print " - You have entered an unrealistic value for <n>."
print " - Please try again."
sub_sample()
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它失败了，因为你试图在一个非常奇怪的区域进行插值。
看看你的输入坐标，你的数据都在一条线上，但你试图在二维中进行插值。你的
yi坐标都是一样的！如果您想要一维插值，那么只需使用众多一维插值例程之一... (
numpy.interp如果您只需要线性插值或scipy.interp1d如果您需要某种样条曲线还有其他几个选项...）。完整的数据集是什么样的？
griddata 默认使用 delauney 三角剖分。每当您最终在输入点之间制作非常薄的、面积接近于零的三角形时，该算法就会出现问题。
如果您确实想要在面积为零的区域上进行二维插值（请参阅此处的问题！！），请尝试另一种（最好是一维）插值算法。如果您需要帮助，请告诉我。
如果您确实想要“伪二维”插值，使用线性距离函数的 scipy.interpolate.Rbf 将是一种选择。请注意，（2D）结果可能不是您所期望的，因为您在 y 方向上绝对没有变化...
或者，如果您希望所有内容都是 y 方向上的平铺 1D 插值结果， y 方向相同。
It's failing because you're trying to interpolate over a very strange region.
Look at your input coordinates, your data is all in a line, but you're trying to interpolate in 2D. Your
yicoordinates are all the same!If you want 1D interpolation, then just use one of the many 1D interpolation routines... (
numpy.interpif you just want linear interpolation orscipy.interp1dif you need splines of some sort. There are several other options as well...).What does the full dataset look like?
griddatauses delauney triangulation by default. Anytime you wind up making very thin, near-zero-area triangles between your input points, this algorithm will have problems.If you really want to interpolate in 2D over a region with an area of zero (See the problems here!!) try another (preferably 1D) interpolation algorithm. If you want help let me know.
If you really do want a "pseudo-2D" interpolation,
scipy.interpolate.Rbfusing a linear distance function would be one choice. Just be aware that the (2D) results may not be what you expect as you have absolutely no variation in the y-direction...Alternately you could just tile the 1D interpolation results in the y-direction if you want everything to be the same in the y-direction.