Comments for Michalis Avraam http://michalisavraam.org intersecting space and time through gis endeavors Tue, 08 Feb 2011 01:03:54 +0000 hourly 1 http://wordpress.org/?v=3.0.3 Comment on Python and Geography: Input Output Models and Graph Theory by Vishal http://michalisavraam.org/2009/05/python-and-geography-input-output-models-and-graph-theory/comment-page-1/#comment-9125 Vishal Tue, 08 Feb 2011 01:03:54 +0000 http://michalisavraam.org/blog/38-blog-entries/54-geopy-graph#comment-9125 MIchalis, This is great. I'm wondering if you could share the Python code for this? FYI I'm just getting into Python for these sorts of applications. Thanks! MIchalis,
This is great. I’m wondering if you could share the Python code for this? FYI I’m just getting into Python for these sorts of applications. Thanks!

]]> Comment on The essential skills to succeed in a GIS career by The Geospatial Technology Competency Model- Finally… a Yardstick! | GIS Jo http://michalisavraam.org/2009/11/the-essential-skills-to-succeed-in-a-gis-career/comment-page-1/#comment-9120 The Geospatial Technology Competency Model- Finally… a Yardstick! | GIS Jo Sun, 06 Feb 2011 18:03:05 +0000 http://michalisavraam.org/?p=218#comment-9120 [...] needed to be a successful GIS professional. It was written by Michalis Avraam, entitled The Essential skills needed to succeed in a GIS Career. This was the post that inspired me to take a serious look at my current skillset and organise my [...] [...] needed to be a successful GIS professional. It was written by Michalis Avraam, entitled The Essential skills needed to succeed in a GIS Career. This was the post that inspired me to take a serious look at my current skillset and organise my [...]

]]> Comment on Geoprocessing Iteration with Python by Johannes http://michalisavraam.org/2009/06/geoprocessing-iteration-with-python/comment-page-1/#comment-9088 Johannes Wed, 02 Feb 2011 15:33:29 +0000 http://michalisavraam.org/teaching/36-pygeoprocessing/56-geoprocessing-iteration-with-python#comment-9088 Hej, I am working with GRASS GIS and access it also via python. What I want to do now is to iterate/loop over the single points of a pointfile. Do you have any idea how to do that in python? I guess I have to loop over the *.dbf file with a for loop, but as I am new to python I don't know how...maybe you can help me. cheers j Hej,

I am working with GRASS GIS and access it also via python. What I want to do now is to iterate/loop over the single points of a pointfile. Do you have any idea how to do that in python?
I guess I have to loop over the *.dbf file with a for loop, but as I am new to python I don’t know how…maybe you can help me.

cheers
j

]]> Comment on About me by Marlo http://michalisavraam.org/about-2/comment-page-1/#comment-8682 Marlo Wed, 12 Jan 2011 20:41:18 +0000 http://michalisavraam.org/points/?page_id=2#comment-8682 We are looking for a spatial anslysis scientist / GIS at NREL. Thought you may be able to help pass around this opportunity. NREL" www.nrel.gov requisition # 1628BR We are looking for a spatial anslysis scientist / GIS at NREL. Thought you may be able to help pass around this opportunity.

NREL” http://www.nrel.gov requisition # 1628BR

]]> Comment on The Essential Python Modules for GIS by Nate http://michalisavraam.org/2010/04/the-essential-python-modules-for-gis/comment-page-1/#comment-8655 Nate Tue, 11 Jan 2011 20:05:35 +0000 http://michalisavraam.org/?p=304#comment-8655 add pysal to the list - http://pysal.org/ add pysal to the list – http://pysal.org/

]]> Comment on The Essential Python Modules for GIS by martin http://michalisavraam.org/2010/04/the-essential-python-modules-for-gis/comment-page-1/#comment-8373 martin Mon, 03 Jan 2011 17:49:30 +0000 http://michalisavraam.org/?p=304#comment-8373 you can use shapely with shapefiles (via ogr) without problem: reading shapefile: >>> from osgeo import ogr >>> from shapely.wkb import loads >>> source = ogr.Open("testpoly.shp") >>> couche = source.GetLayerByName("testpoly") >>> for element in couche: ... geom = loads(element.GetGeometryRef().ExportToWkb()) ... if geom.geom_type == 'Point': ... print geom.type ... print geom ... if geom.geom_type == 'LineString': ... print geom.type ... print geom ... if geom.geom_type == 'MultiLineString': ... print geom.type ... print geom ... if geom.geom_type == 'MultiPolygon': ... print geom.type ... print geom ... if geom.geom_type == 'Polygon': ... print geom.type ... print geom ... Polygon POLYGON ((0.0909447004608295 0.8075576036866359, 0.1416359447004608 0.8014746543778801, 0.3606221198156682 0.7021198156682027, 0.2409907834101383 0.5480184331797234, 0.0868894009216590 0.5845161290322580, 0.0544470046082949 0.7426728110599077, 0.0909447004608295 0.8075576036866359)) Polygon POLYGON ((0.2754608294930876 0.7933640552995391, 0.5370276497695853 0.8136405529953916, 0.4173963133640554 0.5926267281105990, 0.2267972350230415 0.6777880184331797, 0.2267972350230415 0.7447004608294931, 0.2754608294930876 0.7933640552995391)) and same for writing shapefile you can use shapely with shapefiles (via ogr) without problem:
reading shapefile:
>>> from osgeo import ogr
>>> from shapely.wkb import loads
>>> source = ogr.Open(“testpoly.shp”)
>>> couche = source.GetLayerByName(“testpoly”)
>>> for element in couche:
… geom = loads(element.GetGeometryRef().ExportToWkb())
… if geom.geom_type == ‘Point’:
… print geom.type
… print geom
… if geom.geom_type == ‘LineString’:
… print geom.type
… print geom
… if geom.geom_type == ‘MultiLineString’:
… print geom.type
… print geom
… if geom.geom_type == ‘MultiPolygon’:
… print geom.type
… print geom
… if geom.geom_type == ‘Polygon’:
… print geom.type
… print geom
…
Polygon
POLYGON ((0.0909447004608295 0.8075576036866359, 0.1416359447004608 0.8014746543778801, 0.3606221198156682 0.7021198156682027, 0.2409907834101383 0.5480184331797234, 0.0868894009216590 0.5845161290322580, 0.0544470046082949 0.7426728110599077, 0.0909447004608295 0.8075576036866359))
Polygon
POLYGON ((0.2754608294930876 0.7933640552995391, 0.5370276497695853 0.8136405529953916, 0.4173963133640554 0.5926267281105990, 0.2267972350230415 0.6777880184331797, 0.2267972350230415 0.7447004608294931, 0.2754608294930876 0.7933640552995391))
and same for writing shapefile

]]> Comment on Manipulating Excel files using Python part 1: Reading Excel Files by Michalis Avraam http://michalisavraam.org/2009/06/manipulating-excel-files-using-python-part-1-reading-files/comment-page-1/#comment-7317 Michalis Avraam Fri, 03 Dec 2010 18:12:51 +0000 http://michalisavraam.org/blog/38-blog-entries/57-manipulating-excel-files-in-python-no-excel-needed#comment-7317 It is safe to say that some coding knowledge is needed for GIS work. Most analyses these days are not the simple point-and-click sort, but rather an amalgamation of different smaller individual pieces. Coding would allow you to perform that effortlessly for large data sets. As for a national certification... There is the <a href="http://www.gisci.org/" rel="nofollow">GISP certificate</a> by the GIS Certification Institute (and a few other attempts if I am not mistaken) but I have never seen a job posting requiring a certification. Any GIS certificate or degree is usually enough for employees to verify your knowledge. It is safe to say that some coding knowledge is needed for GIS work. Most analyses these days are not the simple point-and-click sort, but rather an amalgamation of different smaller individual pieces. Coding would allow you to perform that effortlessly for large data sets.

As for a national certification… There is the GISP certificate by the GIS Certification Institute (and a few other attempts if I am not mistaken) but I have never seen a job posting requiring a certification. Any GIS certificate or degree is usually enough for employees to verify your knowledge.

]]> Comment on Manipulating Excel files using Python part 2: Writing Excel Files by Michalis Avraam http://michalisavraam.org/2009/06/manipulating-excel-files-using-python-part-2-writing-files/comment-page-1/#comment-7316 Michalis Avraam Fri, 03 Dec 2010 18:08:39 +0000 http://michalisavraam.org/blog/38-blog-entries/58-writing-excel-files-using-python-no-excel-needed#comment-7316 Modifying Excel files is done with XLWTWriter. It is available <a href="https://secure.simplistix.co.uk/svn/xlutils/trunk/xlutils/docs/filter.txt" rel="nofollow">here</a>. The documentation is located <a href="http://www.python-excel.org/" rel="nofollow">here</a>. Modifying Excel files is done with XLWTWriter. It is available here. The documentation is located here.

]]> Comment on The Essential Python Modules for GIS by Michalis Avraam http://michalisavraam.org/2010/04/the-essential-python-modules-for-gis/comment-page-1/#comment-7313 Michalis Avraam Fri, 03 Dec 2010 17:42:44 +0000 http://michalisavraam.org/?p=304#comment-7313 As far as I know, it works fine to read them and I believe write them. As far as I know, it works fine to read them and I believe write them.

]]> Comment on Manipulating Excel files using Python part 2: Writing Excel Files by Frank http://michalisavraam.org/2009/06/manipulating-excel-files-using-python-part-2-writing-files/comment-page-1/#comment-7300 Frank Fri, 03 Dec 2010 13:16:27 +0000 http://michalisavraam.org/blog/38-blog-entries/58-writing-excel-files-using-python-no-excel-needed#comment-7300 Hi There. Do you know how to modify an already existing excel file? Thanks! Hi There. Do you know how to modify an already existing excel file?

Thanks!

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