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Posted on September 25, 2006 by Wyatt

Order levitra online cheap, So let's say you need a spatial geometry library for Python. Levitra over the counter, You could write your own; you could also use the PCL. The PCL includes some packages we don't need, levitra, Buy levitra no rx, like one for MapServer rendering. I only installed the minimum needed to get the spatial package working (which I'll talk about below), levitra sale. Order levitra overnight delivery, [Note: "geometry" refers to points, lines, Rhode Island RI R.I. , Køb billige levitra, polygons and other geometric forms used to represent real-world objects. Examples: intersection (point), street (line), zip code boundary (polygon).]

I wrote a rudimentary geometry library for the trip planner that's been working fine, but now I need to do some more "advanced" stuff related to using PostGIS and SQLAlchemy, order levitra online cheap. In particular, Nebraska NE Nebr. , Cheap generic levitra, I want to convert database values to Python objects and vice versa.

The first part (database to Python) is fairly easy and our current library already does that, kjøpe billig levitra, Arkansas AR Ark. , but it's convoluted in that it gets the database value as well-known text (WKT), parses that, billig kaufen levitra, Order levitra without prescription, and creates a Python object. From what I can tell, levitra pharmacy, Pennsylvania PA Penn. , the PCL can go straight from well-known binary (WKB) geometry to Python objects.

The second part (Python to database) is harder because it involves converting a Python object to a binary geometry value, generic levitra. Order levitra online cheap, I don't know anything about the binary geometry format and I don't want to know, and it looks like with the PCL I don't need to know. Buy levitra online legally, I'm assuming PostGIS and PCL will get along together because they both rely on the same libraries, proj4 and geos, buy levitra. Buy levitra cod, We'll see.

The installation was fairly straightforward, levitra online kopen. Wyoming WY Wyo. , The PCL includes five sub-packages. We had to install two of them, PCL-Referencing and PCL-Spatial, order levitra online cheap. PCL-Referencing requires proj4, farmacia levitra baratos. Buy cheap levitra, PCL-Spatial requires PCL-Referencing and geos >= 2.2.2. Something in there also requires the OGR library, New Mexico NM N.Mex. , Kopen goedkope levitra, which is included with GDAL.

The basic steps are, install proj, geos, and gdal, then install PCL-Referencing, and lastly install PCL-Spatial. On Ubuntu 6.06 (Dapper), here's what I actually did:


  • Installed proj4 using apt-get

  • Installed libgdal using apt-get

  • Installed geos 2.2.3 from source into /usr/lib. I installed this over a slightly older version of geos installed using apt-get; hopefully that won't cause any issues.

  • Checked out the PCL trunk:
    svn co http://svn.gispython.org/gispy/PCL/trunk PCL

  • Installed PCL-Referencing with the usual python setup.py install

  • Installed PCL-Spatial with the usual...

.

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About Wyatt

System Architect and Lead Developer for byCycle.org. Also, employeed by TriMet as a software developer on their GIS team.
This entry was posted in GIS, PostgreSQL, Python, SQLAlchemy, Technical, Trip Planner. Bookmark the permalink.

2 Responses to Order Levitra Online Cheap

  1. Sean Gillies says:
    October 8, 2006 at 2:58 pm

    I just recently switched to Ubuntu and followed these same steps when refreshing my development environment. Now I’m working on making PCL easier to install by completely isolating all PCL dependencies on GDAL and MapServer. See http://trac.gispython.org/projects/PCL/wiki/DependencyMinimization. The new core would depend only on PROJ.4 and GEOS.

  2. Wyatt says:
    October 26, 2006 at 9:53 am

    I just checked out revision 550 to a different machine (also running Dapper), and the installation is slightly different now:

    - sudo apt-get install proj
    - GDAL no longer seems necessary for PCL-Core
    - Install geos 2.2.3 from source (Note to self: apparently libs for extension modules must be installed under the same prefix as Python; e.g., if Python is under /usr/lib, you can’t install geos into /usr/local/lib.)
    - Check out the PCL trunk:
    cd ~/src && svn co http://svn.gispython.org/gispy/PCL/trunk PCL
    - cd PCL/PCL-Core
    - sudo setup.py install

    OK, so that last step really only worked after I modified setup.py in PCL-Core like so:

    from distutils.core import setup, Extension
### Added extensions
proj4_extension = Extension(
'cartography.proj.transform._proj4',
sources=['cartography/proj/transform/_proj4module.c'],
libraries=['proj'],
include_dirs=[]
)

geom_extension = Extension(
'cartography.geometry._geom',
sources=['cartography/geometry/_geommodule.c'],
libraries=['geos_c', 'proj']
)
### End

# ---------------------------------------------------------------------------
# Execute setup
# ---------------------------------------------------------------------------
setup(
name          = 'Python Cartographic Library',
version       = '0.11.0',
description   = 'Library for rendering maps from GIS data',
author          = 'Sean Gillies',
author_email  = 'sgillies@frii.com',
url           = 'http://zmapserver.sourceforge.net/',
packages      = ['cartography',
### Added  stuff below here
'cartography.geometry',
'cartography.proj',
'cartography.proj.transform',
],
ext_modules   = [proj4_extension,
geom_extension,
],
)

    Actually, I don’t know if this really works. I just did the “smoke test” of `python -c ‘import cartography.geometry’`. [Update: It does work.]

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