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POHow can I use the numpy.ndarray output generated in one function as the input into another function?
 

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  1. POHow can I use the numpy.ndarray output generated in one function as the input into another function?
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    <p>Firstly, here is the script:</p> <pre><code>import numpy as np import osgeo.gdal import os ArbitraryXCoords = np.arange(435531.30622598,440020.30622598,400) ArbitraryYCoords = np.arange(5634955.28972479,5638945.28972479,400) os.chdir('/home/foo/GIS_Summer2013') dataset = osgeo.gdal.Open("Raster_DEM") gt = dataset.GetGeoTransform() def XAndYArrays(spacing): XPoints = np.arange(gt[0], gt[0] + dataset.RasterXSize * gt[1], spacing) YPoints = np.arange(gt[3] + dataset.RasterYSize * gt[5], gt[3], spacing) return (XPoints, YPoints) def RasterPoints(XCoords,YCoords): a=[] for row in YCoords: for col in XCoords: rasterx = int((col - gt[0]) / gt[1]) rastery = int((row - gt[3]) / gt[5]) band = int(dataset.GetRasterBand(1).ReadAsArray(rasterx,rastery, 1, 1)[0][0]) a[len(a):] = [band] foo = np.asarray(a) bar = foo.reshape(YCoords.size,XCoords.size) return bar </code></pre> <p>When I load the script that is presented above, I am unable to use the output from the function XAndYArrays as input in the function RasterPoints. But I am able to use the numpy.ndarray that I have defined manually as input in the function RasterPoints. But this is not good enough. I need to be able to use the output from XAndYArrays as input in RasterPoints. Here are the commands that I used at the PyDev interactive console:</p> <pre><code>&gt;&gt;&gt; Eastings,Northings = XAndYArrays(400) &gt;&gt;&gt; Eastings Out[1]: array([ 435530.30622598, 435930.30622598, 436330.30622598, 436730.30622598, 437130.30622598, 437530.30622598, 437930.30622598, 438330.30622598, 438730.30622598, 439130.30622598, 439530.30622598, 439930.30622598]) &gt;&gt;&gt; Northings Out[1]: array([ 5634954.28972479, 5635354.28972479, 5635754.28972479, 5636154.28972479, 5636554.28972479, 5636954.28972479, 5637354.28972479, 5637754.28972479, 5638154.28972479, 5638554.28972479, 5638954.28972479]) &gt;&gt;&gt; RasterPoints(Eastings, Northings) ERROR 5: MergedDEM_EPSG3159_Reduced, band 1: Access window out of range in RasterIO(). Requested (0,246) of size 1x1 on raster of 269x246. Traceback (most recent call last): File "/usr/lib/python2.7/dist-packages/IPython/core/interactiveshell.py", line 2538, in run_code exec code_obj in self.user_global_ns, self.user_ns File "&lt;ipython-input-1-326be9918188&gt;", line 1, in &lt;module&gt; RasterPoints(Eastings, Northings) File "/home/foo/GIS_Summer2013/src/22July_StackOverflowQuestion.py", line 23, in RasterPoints band = int(dataset.GetRasterBand(1).ReadAsArray(rasterx,rastery, 1, 1)[0][0]) TypeError: 'NoneType' object has no attribute '__getitem__' &gt;&gt;&gt; RasterPoints(ArbitraryXCoords, ArbitraryYCoords) Out[1]: array([[422, 422, 431, 439, 428, 399, 410, 395, 398, 413, 409, 386], [414, 428, 421, 430, 426, 403, 409, 410, 406, 408, 412, 406], [420, 428, 427, 424, 408, 406, 428, 420, 408, 410, 409, 420], [392, 418, 426, 430, 414, 428, 430, 418, 433, 414, 402, 399], [400, 411, 420, 406, 401, 405, 398, 420, 419, 400, 401, 414], [408, 421, 418, 428, 399, 398, 405, 412, 421, 406, 395, 397], [399, 404, 398, 401, 400, 399, 399, 398, 398, 419, 399, 395], [401, 410, 407, 407, 404, 400, 398, 397, 397, 399, 400, 398], [400, 410, 418, 405, 401, 400, 397, 398, 400, 398, 397, 396], [389, 387, 399, 408, 423, 400, 407, 398, 411, 408, 410, 420]]) &gt;&gt;&gt; print "partial success" partial success </code></pre>
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    1. COIt looks like the "ERROR 5" line is where the real problem is occurring - perhaps the test data you are giving is invalid.
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