【发布时间】：2015-10-30 13:55:08
【问题描述】：
我正在尝试使用 GIS 扩展中的 apply-raster 将 ascii 加载到 Netlogo 中。 虽然我之前做过很多次（虽然不是使用这个特定的 ascii），但 netlogo 现在会抛出以下错误：
extension exception: 1944553
error while observer running GIS:APPLY-RASTER
我不确定为什么会这样。 ascii 有一个投影文件（WKT），应该可以正常工作：
GEOGCS["GCS_WGS_1984",DATUM["D_WGS_1984",SPHEROID["WGS_1984",6378137,298.257223563]],PRIMEM["Greenwich",0],UNIT["Degree",0.017453292519943295]]
ascii 本身有这些参数：
ncols 1481
nrows 1314
xllcorner -10.577897001
yllcorner 49.902509998994
cellsize 0.00833333333333
NODATA_value -9999
我正在运行这四行来加载 ascii 和调整世界大小。
set my-dataset "data/my-folder/my-file.asc"
resize-world 0 gis:width-of (gis:load-dataset my-dataset) - 1 0 gis:height-of (gis:load-dataset my-dataset) - 1
gis:set-world-envelope-ds (gis:envelope-of (gis:load-dataset my-dataset))
gis:apply-raster (gis:load-dataset my-dataset) my-variable
有人知道这个错误吗？ 或者有没有一个地方我可以查看这个扩展异常的含义？我找不到它，但也许我找错地方了。
谢谢！
编辑： 有关错误的详细信息，请参见下文
Extension exception: 1944553
error while observer running GIS:APPLY-RASTER
called by procedure LOAD-DATASETS
called by procedure CREATE-WORLD
called by Button 'create-world'
org.nlogo.nvm.EngineException: Extension exception: 1944553
at org.nlogo.agent.World.fastGetPatchAt(World.java:560)
at org.nlogo.agent.World.fastGetPatchAt(World.java:35)
at org.myworldgis.netlogo.ApplyRaster.performInternal(ApplyRaster.java:53)
at org.myworldgis.netlogo.GISExtension$Command.perform(GISExtension.java:63)
at org.nlogo.prim._extern.perform(_extern.java:54)
at org.nlogo.nvm.Context.stepConcurrent(Context.java:91)
at org.nlogo.nvm.ConcurrentJob.step(ConcurrentJob.java:82)
at org.nlogo.job.JobThread.org$nlogo$job$JobThread$$runPrimaryJobs(JobThread.scala:143)
at org.nlogo.job.JobThread$$anonfun$run$1.apply$mcV$sp(JobThread.scala:78)
at org.nlogo.job.JobThread$$anonfun$run$1.apply(JobThread.scala:76)
at org.nlogo.job.JobThread$$anonfun$run$1.apply(JobThread.scala:76)
at scala.util.control.Exception$Catch.apply(Exception.scala:88)
at org.nlogo.util.Exceptions$.handling(Exceptions.scala:41)
at org.nlogo.job.JobThread.run(JobThread.scala:75)
NetLogo 5.2.0
main: org.nlogo.app.AppFrame
thread: JobThread
Java HotSpot(TM) Server VM 1.6.0_45 (Sun Microsystems Inc.; 1.6.0_45-b06)
operating system: Windows 7 6.1 (x86 processor)
Scala version 2.9.2
JOGL: (3D View not initialized)
OpenGL Graphics: (3D View not initialized)
model: test_run_world
03:23:17.778 SwitchedTabsEvent (org.nlogo.app.Tabs) AWT-EventQueue-0
03:23:17.778 RuntimeErrorEvent (org.nlogo.app.App$$anon$1 (org.nlogo.window.GUIWorkspace)) AWT-EventQueue-0
03:23:17.778 InterfaceGlobalEvent (org.nlogo.window.ChooserWidget) AWT-EventQueue-0
03:23:17.778 InterfaceGlobalEvent (org.nlogo.window.InputBoxWidget) AWT-EventQueue-0
03:23:17.778 InterfaceGlobalEvent (org.nlogo.window.InputBoxWidget) AWT-EventQueue-0
03:23:17.778 InterfaceGlobalEvent (org.nlogo.app.InterfacePanel$2 (org.nlogo.window.SliderWidget)) AWT-EventQueue-0
03:23:17.778 InterfaceGlobalEvent (org.nlogo.window.ChooserWidget) AWT-EventQueue-0
03:23:17.778 InterfaceGlobalEvent (org.nlogo.window.ChooserWidget) AWT-EventQueue-0
03:23:17.778 InterfaceGlobalEvent (org.nlogo.window.ChooserWidget) AWT-EventQueue-0
03:23:17.778 InterfaceGlobalEvent (org.nlogo.widget.SwitchWidget) AWT-EventQueue-0
【问题讨论】：
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这个错误在我看来好像问题出在 GIS 扩展中；该扩展正在计算 pxcor 和/或 pycor 的越界值，然后尝试访问不存在的补丁。我不知道 GIS 的东西或扩展的胆量，所以我无法推测为什么会这样。在这种情况下，它至少应该给出一个易于理解的错误信息。