Web mapping client comparison v.6 This comparison aims to serve as a basis for those seeking a first approach to Web mapping technologies at the client side. In the sixth version a number of projects have been added and the whole set of clients has been categorized in order to distinguish them better, since there are currently forty four (44) Web mapping clients in the comparison. Web mapping clients play a significant role in Geoportals of Spatial Data Infrastructures (SDI) allowing the visualization of spatial data from several sources. There exists a wide variety of free and open source software (FOSS) projects that make the creation and configuration of Web mapping clients easier. This study presents a wide collection of Web mapping clients capable to access Open Geospatial Consortium (OGC) Web services, and examines some of their most relevant properties, but does not represent an exhaustive analysis of their technical features. Below is a graph showing the relation between free and open source Web mapping clients.
Tässä.fi+ Il GIS su Internet — Home OSGeo & Health Workshop (#gecohealth) Invalid quantity. Please enter a quantity of 1 or more. The quantity you chose exceeds the quantity available. Please enter your name. Please enter an email address. Please enter a valid email address. Please enter your message or comments. Please enter the code as shown on the image. Please select the date you would like to attend. Please enter a valid email address in the To: field. Please enter a subject for your message. Please enter a message. You can only send this invitations to 10 email addresses at a time. $$$$ is not a properly formatted color. Please limit your message to $$$$ characters. $$$$ is not a valid email address. Please enter a promotional code. Sold Out Pending You have exceeded the time limit and your reservation has been released. The purpose of this time limit is to ensure that registration is available to as many people as possible. This option is not available anymore. Please read and accept the waiver. All fields marked with * are required. US Zipcodes need to be 5 digits. Map
kantaa valitsemassa Nykyään ensisijainen tapa tallentaa paikkatietoja on relaatiotietokanta. Tiedostopohjaiset ratkaisut ovat hyviä tietojen siirtämiseen, mutta varsinainen paikkatietojen käsittely tehdään pääsääntöisesti tietokantaan tallennetuista paikkatiedoista. Tietokantaratkaisujakin on nähty monenlaisia matkan varrella: relaatiopohjaiset tietokannat ovat kuitenkin yleisyytensä kautta muodostuneet defacto-ratkaisuksi. Oikean relaatiotietokannan valinta on sitten hieman monimutkaisempi ongelma. Jos on mahdollisuus vapaasti valita paikkatietojen tallentamiseen relaatiotietokanta, niin on hyvä tutustua tähän blog-kirjoitukseen: Compare SQL Server 2008 R2, Oracle 11G R2, PostgreSQL/PostGIS 1.5 Spatial Features. Paikkatietokannan valintaa ei voi eriyttää sovelluspalvelimista ja työasemasovelluksista. Tykkää tästä: Tykkää Lataa...
ESRI’s brilliant marketing move and what Open Source GIS can learn from it « Mapoholic ESRI has announced “ESRI Maps for Office”, an Excel add-in which will be available in public beta the first half of 2012. So imagine: You have all your Excel data, all the power of Excel for analysis and now, you can also display this data on a map WITHIN Excel to explore and analyze it in a whole new way.Fantastic – no? It probably is. ESRI hasn’t released any information about pricing or licensing (e.g. would you need to have ArcGIS installed on the desktop to use the add-in?) but this is beside the point. This move by ESRI, penetrates -in a big way- a previously untapped market. In a recent blog post, Sofia Parafina, argues that the release of TileMill for Windows will be the game changer for the adoption of open source mapping. I beg to differ. …it’s rather bare bones in that there is no tool to select a feature and set the line style, color, or fill in a menu. So here we go. BUT, providing a –say- QGIS add-in for Excel might do the trick. Now, this IS a game-changer! Like this:
Compare SQL Server 2008 R2, Oracle 11G R2, PostgreSQL/PostGIS 1.5 Spatial Features In our prior compare -- we compared PostgresQL 8.3/PostGIS 1.3-1.4, SQL Server 2008 and MySQL 5+ (now owned by Oracle). Many people would have preferred seeing Oracle or IBM DB2 in the mix since few use MySQL seriously for spatial work. So by popular demand we are replacing our compare of MySQL with that of Oracle. A couple of exciting things have happened since that last comparison. PostGIS released PostGIS 1.5 which introduced native geodetic support in the form of a new type called geography. In this new comparison, we'll be comparing the geodetic support offered by these three commendable spatially enabled DBMS as well as standard OGC planar geometry support. In PostgreSQL/PostGIS and SQL Server you get both geometry and geography full support as well as all the functions that work with them at no extra cost but as two separate data types. Full Disclosure -- Regina is on the PostGIS project steering committee. Why would you ever want to pick more than one. Now on with the show.
Group Stats Tutorial Group Stats is a plugin for QGIS which makes it easy to calculate statistics for feature groups in a vector layer. Note that the plugin is still marked “experimental” so you have to allow experimental plugins in order to install it. I tried this plugin for the first time today and decided to write this post because it didn’t seem immediately obvious how to use it. The plugin button is added to the vector toolbar and of course you can access it via vector menu. The example I want to show is: How to calculate the total area of of each Corine Land Cover (CLC) class per state. After adding state information to the CLC datasets by intersecting CLC and state geometries from Natural Earth we can get started with Group Stats. The big area on the left will display the results. To calculate the total area of of each Corine Land Cover (CLC) class per state, I chose land cover classes as columns, state names as rows and sum of areas as values: Like this: Like Loading...