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#! /usr/bin/env python
#
#
# A simple utility for passing parameters to ST_AsGDALRaster
# for a GDAL raster output
# This utility is handy for debugging purposes.
#
# Example:
# rtgdalraster.py -d "dbname=postgres" -r "(SELECT rast FROM pele LIMIT 1)" -f JPEG -o pele.jpg
#
#
###############################################################################
# Copyright (C) 2011 Regents of the University of California
# <bkpark@ucdavis.edu>
# Copyright (C) 2009 Mateusz Loskot <mateusz@loskot.net>
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software Foundation,
# Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
###############################################################################
from __future__ import print_function
from optparse import OptionParser
import sys
import os
import psycopg2
def logit(msg):
if VERBOSE is True:
sys.stderr.write("LOG - " + str(msg) + "\n")
###############################################################################
try:
prs = OptionParser(version="%prog",
usage="%prog -d <DB> -r <RASTER> -o <FILE> [-f <FORMAT>] [-c <OPTIONS>]",
description="Output raster in a GDAL raster format")
prs.add_option("-d", "--db", dest="db", action="store", default=None,
help="PostgreSQL database connection string, required")
prs.add_option("-r", "--raster", dest="raster", action="store", default=None,
help="sql expression to create or access a existing raster, required")
prs.add_option("-o", "--output", dest="output", action="store", default=None,
help="file to put the output of ST_AsGDALRaster if successful, required")
prs.add_option("-f", "--format", dest="format", action="store", default="GTiff",
help="format of GDAL raster output, optional, default=GTiff")
prs.add_option("-c", "--config", dest="config", action="store", default=None,
help="comma separated list of GDAL raster creation options, optional")
prs.add_option("-v", "--verbose", dest="verbose", action="store_true", default=False,
help="be excessively verbose and useful for debugging")
(opts, args) = prs.parse_args()
if opts.db is None:
prs.error("use -d option to specify database connection string")
if opts.raster is None:
prs.error("use -r option to specify a sql expression for a raster")
if opts.output is None:
prs.error("use -o option to specify raster output file")
if opts.config is not None:
opts.cfg = opts.config.split(',')
else:
opts.cfg = None
global VERBOSE
VERBOSE = opts.verbose
conn = psycopg2.connect(opts.db)
logit("Connected to %s" % opts.db)
logit("Raster expression is %s" % opts.raster)
cur = conn.cursor()
sql = "SELECT ST_AsGDALRaster(%s, %%s, %%s::text[], NULL::integer)" % (opts.raster)
cur.execute(sql, (opts.format, opts.cfg))
logit("Number of rows: %i" % cur.rowcount)
rec = cur.fetchone()[0];
logit("size of raster (bytes): %i" % len(rec))
fh = open(opts.output, 'wb', -1)
fh.write(rec);
fh.flush();
fh.close();
logit("size of %s (bytes): %i" % (opts.output, os.stat(opts.output)[6]));
cur.close();
conn.close();
print("raster outputted to %s" % opts.output);
except Exception as e:
print("ERROR: ", e)
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