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Showing posts from 2011

Postgresql PostGIS How to set your search_path

The problem: You want to have all your spatial data in a schema other than "public" in your Postgresql PostGIS database and don't want to have to always specify the schema.tablename when creating new tables. The solution: Close the connection to the database you want to change run the sql query                 ALTER DATABASE DatabaseName SET search_path = '$user','geodata', 'public';              in this example the schema 'geodata' is the primary schema where I want to store all my spatial tables.  The order in which Postgresql "searches" where to create the table is then defined in the same order as you have listed in your SET search_path statement. If you just want to change the search_path for a current session you can use: SET search_path = '$user','geodata', 'public'; now you can merrily go and create a new table and it will automatically be created in your 'geodata' schema.

How to upgrade Geoserver 2.1.1 to 2.1.2

From 2.1.1 to 2.1.2, Ubuntu 10.04 Server, Tomcat6 Note: all those commands need to be done as root (or alternatively, run sudo before the command) Stop Apache tomcat: /etc/init.d/tomcat stop Backup the your directories, this could be different from your own installation: /var/geoserver-data, /opt/tomcat/webapps/geoserver/   tar -cf geoserver-data-nov-17.tar /var/geoserver-data # takes quite long on current geoserver installation (orthofotos, ...) gzip geoserver-data-nov-17.tar tar -cf geoserver-app-nov-17.tar /opt/tomcat/webapps/geoserver gzip geoserver-app-nov-17.tar Additionally, backup web.xml file from WEB-INF directory: cp /opt/tomcat/webapps/geoserver/WEB-INF/web.xml web-backup-nov17.xml Download latest (in this case: 2.1.2) geoserver version (war archive) wget http://downloads.sourceforge.net/geoserver/geoserver-2.1.2-war.zip Unzip it unzip geoserver-2.1.2-war.zip Copy it to the tomcat webapps directory cp geoserver.war /opt/tomcat/webapps/geoserver.war Delete

Why use OpenERP in a small business

Well it did take more than 1/2 hour to get   OpenERP   Odoo  up and running last night.  To be precise it took exactly 4,75 hours. I must say that I'm impressed with the modules, features and useability.   Now I need at least 1 week to play/customize it and we are off to the races. Why did I install an Enterprise Resource Planning (ERP) web application for my small business? Well my company GOMOGI   like all other small businesses around the world need to do all the same stuff like big companies on a smaller scale like: manage and engage customers (Customer Relationship Management ( CRM )) marketing our products write bills/invoices manage projects with AGILE   SCRUM   methodology Getting Things Done way to organize my busy multitasking days, weeks, months and years This keeps all our STUFF in one place and accessible online at anytime no matter where I am (onsite with a customer, traveling, anywhere). No backing up issues since our hosting provider takes care of that f

What Python version do my geospatial apps/libraries use?

Setting up a new PC and I was interested to know what version of Python is being installed and used by various GIS applications and libraries. The problem many new users have is finding what version to install with what software.  So here is the run down of what is using what Python Version. FWTools 2.4.7 (Windows 32bit)   uses Python 2.3.4 ESRI ArcGIS 10 uses Python 2.6.5  on installation ESRI ArcGIS 9.3 uses Python 2.5.1 OSGeo4w  uses Python 2.5.2 Google AppEngine as of 08.06.2011 uses Python 2.5.2   Roadmap has 2.7 in sight Ubuntu Server 10.04 has Python 2.6.5  as a standard instal Django supports any Python version from 2.4 to 2.7  A quick note GdalOgrInPython GDAL this link for details      Dependencies Python 2.X (and 3.X since GDAL 1.7.0). Python 2 versions known to work range from 2.3 to 2.7. libgdal (1.5.0 or greater) and header files (gdal-devel) numpy (1.0.0 or greater) and header files (numpy-devel) (not explicitly required, but many examples and utilitie

Quick Start Guide to OpenStreetMap (OSM)

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As I find myself teaching more and more people to get started with the OpenStreetMap (OSM)  project the first "Newbie" steps are just still to complicated for non - tech users who want to add a simple house or Point of Interest based off Bing Images aka not using GPS. It is really quite straight forward. Lets take for example I want to add a parking lot as  POINT so the parking lot symbol will show when rendered with the standard mapnik renderer aka the main map you see when first starting to us OSM maps. Register for a free account here you need this to do editing. Zoom to a small area where you want to add some data using the map interface. If you can see your entire city that is to much and is not allowed, try zooming in on a smaller area it will be faster too. Select the online editor by just holding your mouse over the Edit Tab and select the online editor for this example I'm using Potlatch2 (You need FLASH installed) . Now double click one time on the s

Free Geodata

Whenever you have a spatial project it usually begins with some data.  Now what if you don't have any data?  Well here come some sources to your rescue. EDEN Data Archive   has a huge list of free data sources OpenStreetMap GeoFabrik Cloudmade International ADDS - Africa Data Dissemination Service Natural Earth Data Depot's Country List GeoBase: Canadian site for sources of free GIS data GeoGratis: Canada's National Digital Atlas Geoscience Australia Gridded Population of the World GoGeo GIS Database (UK) Russian Federation Digital Data Southern Africa Regional Science Initiative (SAFARI)   Imagery Arizona Regional Image Archive (AVHRR, AVIRIS, MSS, TM, SPOT for six southwestern states including California) Canadian Geospatial Data Infrastructure Earth Explorer (Landsat, AVHRR and aerial photos) Earth Observing System Data Gateway (Atmosphere, land, ocean, solar and cryosphere imagery) Geoscience Australia (Free Landsat 7, MODIS & AVHRR

Python and related spatial resources

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To start the first post of the new year here are some thoughts and resources to anyone just starting out in GIS who has NO computer science training at all and wants quick access to great python spatial resources in print and on the web. James Fee over at his blog post has also some thoughts on python for 2011. Why Python ? well ESRI the "world number one" in GIS uses it as its scripting language of choice and VBA will eventually die. Plus the open source GIS scene is also in love with python and of course I just like it. Python books I invested some money into when I started out.  The rest of the python resources are of course all coming from web sources, blog posts and from reading a TON of documentation. First off here are two good free books to get you started: Byte of Python How to think like a computer scientist These ones cost some money if you still read hard copies ( I do )   Second on the list are bloggers who use Python : Sean Gillies   New Yor