Hot answers tagged learning
Using Snow's Cholera map story. When John Snow mapped the Cholera outbreak in London, he noticed that most cholera cases appeared near certain water pumps. After these pumps were closed or cleared, the cholera outbreak stopped. This is how Mommy's/Daddy's work can help save the world! In general, I always like to explain using images and vivid examples. A ...
Boundless' Introduction to PostGIS Boundless (formerly opengeo) has a very very good workshop with a lot of exercises on the PostGIS database. I would start with this one.
Not really a full-blown GIS projects, but interesting example of situation when spatial aspects were not handled correctly. Economist's 'North Korea missile threat' first looked like: Whereas in reality should look like: Readers quickly pointed mistake and Economist admitted it and posted correction. (via Spatial Analysis blog) Edit: Some more info ...
Kids often learn well through experiences, so I'd take them geocaching, and show them how the coordinates helped us find the cache. Afterward, I'd display the track in Google Earth or QGIS, and show them maps overlaid with our trail. Finally, we could calculate how high we climbed to reach the cache using a DEM, or display other data like rainfall to ...
Vector Data Advantages : Data can be represented at its original resolution and form without generalization. Graphic output is usually more aesthetically pleasing (traditional cartographic representation); Since most data, e.g. hard copy maps, is in vector form no data conversion is required. Accurate geographic location of data is maintained. Allows for ...
Some starting points to consider: PostGIS in Action (Second Edition) should be your first resource PostGIS section of 'Introduction to the OpenGeo Suite' Boundless workshops Materials from BostonGIS webpage Also, for general introduction to PostgreSQL I quite enjoyed 'Beginning Databases with PostreSQL' book by Matthew & Stones.
I love the Geospatial Revolution series of videos from Penn State University. It's a beautifully produced set of videos showcasing some everyday uses of GIS.
There is one blog post from Michalis Avraam that explains essential skills to succeed in GIS career which I think is well written. You will probably find lot of good advices there.
A standard term is geodetic coordinate system. However, the market leader in GIS software tends to invent new terminology with each new release of its flagship system, and by virtue of gaps in fundamental training by most of its users (or just plain enthusiasm for new words), this terminology quickly gets adopted by the majority. For example, "Geographic ...
Few from my side, mostly out of ESRI world: CARTODB MapBox OPENGEO Linfiniti Geo Blog Smathermather's Weblog GISTUTOR Open Source Computing and GIS in the UK Google Geo Developers
Well I just talked about it with my 11-year old and he understood but was unimpressed. Me: "Imagine you have a map of our city and you want to colour it by income" Him: "But isn't that money? How does that become colour" Me: "Perhaps I decide that high income is green and low income is red and incomes in between are colours in between green and red" ...
Geospatial, geographic and spatial are used interchangeably to mean data with a spatial component, probably on the surface of the earth. The reasoning behind the portmanteau geospatial is that spatial alone is too generic: any three dimensional space qualifies, and geographic is too specific: you could use the same methods for manipulating martian data. ...
Pixels vs Coordinates When I think Raster maps, my first thought is satellite imagery. Almost every pixel in a detailed satellite image of a urban area could contain unique information. A single tile in a web map (typically a variant of Mercator loosely referred to as "Spherical Mercator" or "Web Mercator" and supported by Google, Bing, Yahoo, OSM and ...
I like Chris Garrard's Python for Geoprocessing course materials. http://www.gis.usu.edu/~chrisg/python/2009/ Personally, I find programmatic manipulation of OGR/GDAL to be indispensable. With respect to finding the best fit for you, consider the software or geostack you wish to be most expert in (like ArcGIS, QGIS, PostGIS-GeoServer-OpenLayers), and then ...
This illustration stuck with me, and helps me remember at the most basic level what precision vs. accuracy is.This is the source of the image, also containing a little more context. In general, Precision is the how close your grouping of measurements are. Accuracy is how close your measurement is to the actual measurement in the real world. Blah238 is ...
I would not compare GIS to a programming language. A programming language is a tool that can be used to define your business process. "Perform these steps in this order, making some decisions as you go." GIS is more abstract; rather than being a tool to define a process, it's an entire branch of tools and methods that manipulate data that have location. ...
Here is one more: Eurocrats forgetting about Wales on the cover of Eurostat yearbook 2004 Reactions from BBC, Telegraph, and Mail. (via Spatial Analysis blog; image from GIT NEWS)
If you're into open source GIS, I would recommend FOSS4G, 6-9 September in Madrid Barcelona this year. You have another week or so to submit an academic paper if you want to present.
My way to find PostGIS was http://bostongis.org/?content_name=postgis_tut01#20 there is three parts of the tutorial. I really like it. Then I have to mention: http://postgisonline.org I have tried to build a way of trying spatial SQL queries online. There are a very few tutorials there: http://postgisonline.org/tutorials anyone can write a tutorial and ...
I do like How to Lie with Maps.
VB.Net Add-Ins for sure. The ESRI walk-troughs will get you on the way. I've been using VB6 and VBA for years and personally I find VB fairly intuitive. Of course VB .Net is an entirely different animal but the add-in structure is relatively simple to learn and deploy. I just took a technical workshop in ArcPy at an ESRI conference and I have to say that I ...
Have you looked at the "gentle GIS introduction" found on the QGIS website? Might be a good starting place to look for topics. The address is: http://qgis.org/en/documentation/manuals.html It's found towards the bottom of the page.
This beginner's course offered by GBD Consult might be a good reference. Their course covers the following topics: Installation Overview and Applications of Quantum GIS Introduction to the Graphical User Interface Data management and fundamentals on projections Integrating and analyzing vector and raster data Attribute management and ...
11 years old might be a little young for Grand Theft Auto, but you could sit down with them, and show them this map, and explain > "I do this, but in the real world."
Don't start with C++ and GIS without learning software development first. It's just too much. Python is a good place to start regardless of what GIS platform you go with later. There are a lot of books, websites and training materials available and a lot of colleges use python as an introduction before going on to the heavy duty programming languages, like ...
Ahhh, the dreaded 'decimal minutes'... I think that different people are comfortable with different formats based on the areas that they work/play in. If you plan to use the coordinates to create spatial features, I would store them in decimal degrees (or as spatial features). Computers don't deal well with Sexgesimal numeral systems. (Funny that our ...
A great question to ask over beers (you'd get some fun answers for sure). My greatest failures (yea plural unfortunately) usually revolve around scope creep. More is never better, words to live by.
The bostongis website provides many tutorials and quick guides regarding PostGIS, SQL Server 2008 and spatial analyses, openlayers, OSM and openlayers and some more. The faunitalia youtube channel gives video tutorial regarding Qgis and plugins
Should't Cristopher Columbus be mentioned here? He thought he was on the other side of the globe when he arrived in America. No doubt it was because of bad map data. edit: maybe at least not only bad data according to whubers comment, more like common architect technique to get their dream project come true. /Nicklas
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