[postgis-users] PL/Python

[Martijn Meijers]

I think the gdal.getDriver call returns None. Hence the attribute error on the line afterwards. Are you sure that 19 is what you should pass as input?

Martijn

Verzonden vanaf mobiel.

<div>-------- Oorspronkelijk bericht --------</div><div>Van: David Haynes <haynesd2 at gmail.com> </div><div>Datum:18-05-2016  17:35  (GMT+01:00) </div><div>Aan: postgis-users at lists.osgeo.org </div><div>Onderwerp: [postgis-users] PL/Python </div><div>
</div>Hello,

I have a question regarding importing the gdal library using pl/python. Specifically, I want to create an in memory raster using the gdal library. This is a snippet of code that I have written,

CREATE OR REPLACE FUNCTION terrapop_area_level_to_raster2( sample_geog_level_id bigint, raster_variable_id bigint, raster_band bigint) RETURNS text AS
	$BODY$   
	
	from osgeo import gdal
	import numpy as np
	from osgeo import ogr, osr
	

	memDriver = gdal.GetDriver(19)
	#memDriver = gdal.GetDriverByName('MEM')
	memRast = memDriver.Create('', 10, 10, 1, gdal.GDT_Int32)

This is the error I receive. A python NoneType error. Which seems to that the gdal class has not been imported. I have verified that gdal is available on the system. 

ERROR: AttributeError: 'NoneType' object has no attribute 'Create'
SQL state: XX000

However, this function on the same server and database returns to me all the gdal drivers. Any idea how I can diagnose this problem?

CREATE OR REPLACE FUNCTION gdal_drivers()
  RETURNS SETOF text AS
$BODY$

from osgeo import gdal
driver = gdal.GetDriverByName('MEM')
rast = driver.Create('', 2, 4, 1, gdal.GDT_Int32)

names = []
driverall = gdal.GetDriverCount()
for i in range(gdal.GetDriverCount()):
	driver = gdal.GetDriver(i)
	drivername = driver.ShortName
	names.append([i,drivername])

return names

$BODY$
  LANGUAGE plpythonu VOLATILE





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