Wednesday, January 26, 2011

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
  1. GeoFabrik
  2. Cloudmade
International
  1. ADDS - Africa Data Dissemination Service
  2. Natural Earth
  3. Data Depot's Country List
  4. GeoBase: Canadian site for sources of free GIS data
  5. GeoGratis: Canada's National Digital Atlas
  6. Geoscience Australia
  7. Gridded Population of the World
  8. GoGeo GIS Database (UK)
  9. Russian Federation Digital Data
  10. Southern Africa Regional Science Initiative (SAFARI) 
Imagery
  1. Arizona Regional Image Archive (AVHRR, AVIRIS, MSS, TM, SPOT for six southwestern states including California)
  2. Canadian Geospatial Data Infrastructure
  3. Earth Explorer (Landsat, AVHRR and aerial photos)
  4. Earth Observing System Data Gateway (Atmosphere, land, ocean, solar and cryosphere imagery)
  5. Geoscience Australia (Free Landsat 7, MODIS & AVHRR data)
  6. Global Land Cover Facility (ASTER, Landsat, MODIS, AVHRR)
  7. Global Visualization Viewer (Free ASTER, MODIS and Landsat Imagery)
  8. Landsat.org (Huge collection of Landsat imagery; not all free)
  9. NASA Image Server (Landsat 4,5,7)
  10. Terraserver (Quickie air photo images from Microsoft)
  11. University of Nevada Landsat TM Archive (State of Nevada)
  12. USGS EROS Data Center (Many sensors with links to data access)
Land Cover Data
  1. The U.S. Environmental Protection Agency's Land Cover Data Directory
  2. Global Land Cover 2000
  3. Global Land Cover Facility
  4. GAP analysis program (land cover data by U.S. State)
  5. USGS Geographic Data Download (older LULC data)
  6. National Land Cover Dataset from USGS (seamless and the most current for the US)
    1. NLCD Class Definitions in html or EXCEL .dbf format
  

Friday, January 7, 2011

Python and related spatial resources

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:
These ones cost some money if you still read hard copies ( I do )
Head First Programming: A Learner's Guide to Programming Using the Python LanguagePython Geospatial DevelopmentLearning Python: Powerful Object-Oriented Programming 


    Second on the list are bloggers who use Python:

    Other spatial Python sources or projects on the web:
     Non Spatial Python web resources and training materials for Python

    Feel free to help me out add to this collection of links and post a comment.
    cheers michael