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I prompted a flurry of PostGIS hate (and some love) on Twitter last week, documented via Storify . I’ve been using PostGIS for around 2 years now both at Stamen and before that at The Washington Post. Let me say upfront that PostGIS is amazing and is definitely in the top 5 best FOSS4G (free and open source software for geo) out there. It is a super powerful spatial data store that is free to download, install, and use (even in commercial projects!). It’s can also be mind numbingly difficult to install and use. It doesn’t matter how awesome something is unless it’s usable.
Même s’il est parfois nécessaire de réaliser soi-même la jointure avec les données statistiques, les couches vectorielles disponibles sur internet et téléchargeables gratuitement sont relativement nombreuses. Il en est de même des couches raster et même des modèles numériques de terrain. Nous en présentons ici une sélection utile pour l’enseignement de nos disciplines, aussi bien en Géographie qu’en Histoire.
How-to (Select tiles directly) Map can be scrolled and zoomed by cursor. Zooming is possible both by mouse and scale bar on the top of the map. When clicking [# Grid] button, tiles will appear.
Raster IGN BDAlti La BDAlti de l'IGN est un MNT disponible sur la France en différentes résolutions. les versions 250 m, 500 m et 1000 m sont disponibles gratuitement. Emprise des données : France (dont DOM/TOM)
Certains formats de fichiers nécessitent une conversion. En cas de besoin, voir ici . Ces données sont utiles en 1S et TS pour enseigner la tectonique des plaques. Un TP (en anglais) montre où trouver des données.
World government data revealed Data, data, data. There's loads of it out there and more coming your way as governments open their statistics vaults around the world. First the US with data.gov , then Australia and New Zealand followed suit. Now it's the UK's turn with data.gov.uk .
Select and download free geographic (GIS) data for any country in the world Sources Formats The files have been compressed and grouped in ZIP files. You can use programs such as 7-zip, PKZIP or StuffIt to decompress the files. Vector data are stored as ESRI shapefiles Grid (raster) data are stored as DIVA gridfiles
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Some of these data sites are more specific by subject or by region than others. However, it is suggested to first try the links under the “National and International Data” heading before going to more specific sites. The National and International sites are more generic in some instances and may have the data that you are trying to locate. When searching these sites, the keywords of “GIS” and the “subject” in question are usually good starting points if you are having difficulty.
From World Wind Wiki Below is a list of sites offering free orthoimagery of various locations. Note that most of the following do not offer the imagery up via WMS and is thus not easy (as yet) to incorporate into World Wind. [ edit ] Austria [ edit ] Burgenland [ edit ] Kärnten
Sponsors Page 1 of 4, Go To Next Page Doing GIS doesn't have to be expensive or complicated. If you are new to GIS, check out our free GIS tutorial and atlas . Then download free GIS software and free ArcGIS shapefiles here on these pages.
With hurrican Irene on its way. I thought some of you may be interested in these historical hurricane shapefiles. These cover the period from 1851 up to 2004. I'm working also to include more recent hurricanes in the near future. The paths of tropical cyclones and major hurricanes from 1851 to 2004. The term "tropical cyclone" is a generic term for a low-pressure storm system that usually forms in the tropics.
ASTER GDEM 30m DEMs for the world. Downloadable, but a bit hard to navigate. CIESIN (Center for International Earth Science Information Network) Earth Institute, Columbia University Interdisciplinary research related to human interactions in the environment CIESIN hosts: Socioeconomic Data and Applications Center (SEDAC) SEDAC focuses on human interactions in the environment.
Data themes are available in three levels of detail. For each scale, themes are listed on Cultural, Physical, and Raster category pages. Stay up to date! Know when a new version of Natural Earth is released by subscribing to our announcement list . Overwhelmed?
HYDRO1k is a geographic database developed to provide comprehensive and consistent global coverage of topographically derived data sets, including streams, drainage basins and ancillary layers derived from the USGS' 30 arc-second digital elevation model of the world (GTOPO30) . HYDRO1k provides a suite of geo-referenced data sets, both raster and vector, which will be of value for all users who need to organize, evaluate, or process hydrologic information on a continental scale. Center for Earth Resources Observation and Science (EROS) , the HYDRO1k project's goal is to provide to users, on a continent by continent basis, hydrologically correct DEMs along with ancillary data sets for use in continental and regional scale modeling and analyses. Detailed descriptions of the processing steps involved in development of the HYDRO1k data sets can be found in the Readme U.S.