Last minute plug for a geo breakfast. Come hangout, drink coffee, and eat yummy K&Z grub with other geonerds. Just look for the mappy people.

This month at MaptimeStJohns, we will begin programming a basic web spatio-temporal visualization, bring a computer if you have one. Ill bring the js library files for leaflet and the various plugins we will be using. If you have a temporal dataset, bring it... Ill have a couple of datasets to choose from though. Our goal will be for everyone to create at least one temporal point visualizations. An example would be the point locations of where floods occurred with the location, size of flood and date of flood event. With this data we could create a temporal proportional symbol map. The user will be able to click on the locations for specific locations and also use a slider to see when and where floods occurred over time. Let's create some cool web map visualizations!

OSGeo Spatio-Temporal Web Visualizations, Tuesday, September 30, 7:30pm to 9, Anna Bananas, 8716 N. Lombard, Portland

This month at MaptimeStJohns, we will be to continue programming web spatio-temporal visualizations, bring a computer if you have one. If you have not come before, that is alright because we will step through each visualization. I'll bring the js library files for leaflet and the various plugins we will be using. Let's create some cool web map visualizations! please RSVP

Monthly meeting of the open source GIS group PDX-OSGeo.

Discussion of all things spatial and open source.

Monthly meeting of the open source GIS group PDX-OSGeo.

Discussion of all things spatial and open source. Tonight's guest is Dave Mangold, who will speak to us about how to create great cartographic products using QGIS and Inkscape.

Attendees of FOSS4G will remember the excellent map that Dave produced for the printed program [1].

From Dave's Description of his map:

This map was created entirely from freely available data and open-source software. Data were obtained as shapefile downloads from METRO RLIS. These shapefiles were then loaded into a PostGIS database as spatial tables. The initial map was created in QGIS. This map was then saved in a vector format and finished in InkScape, where label adjustment and creation, feature layering, and annotation were accomplished. On the map, if you look closely at the southern portion of Naito Street (right edge of left panel), you will see a hidden tribute to the free and open-source resources used.

[1] https://2014.foss4g.org/wp-content/uploads/mapgallery/orig/150.png

Monthly meeting of the open source GIS group PDX-OSGeo.

Discussion of all things spatial and open source. Tonight's guest is Nick Martinelli who will speak to us about using CartoCSS and UTFGrids for collaborative mapping.

From Nick's Description of the project:

Warning, this talk is about cartographers designing and building web applications. Tasked with making a mapping application for internal business use, we reached out for open source tools that could be combined to produce a platform for collaborative mapping and data sharing. We used tools like Mapbox.js, windshaft, mapnik, and PostGIS to build a web based application that allows its users to create, filter, edit, and share interactive maps and data with teams or individuals. The presentation will take you through the challenges of building on FOSS, and the importance of small group collaborative mapping. Highlights will be our efforts to use great, but occasionally sparsely documented FOSS code and tools, and the sometimes challenging chore of making them play nice together. Also, discussion of why we feel collaborative editing and creation of dynamic maps is an important future focus for web mapping applications. Last, the product we ended up with, and continue to develop for private use opens up the conversation about how to best give back to the FOSS community from the private sector.

Monthly meeting of the open source GIS group PDX-OSGeo.

Discussion of all things spatial and open source. Tonight's guest is Justin Miller who will speak to us about Mapbox GL for JavaScript, "which despite being in active development, is totally usable for certain projects". The particular project he built out is a travel choropleth map with dynamic interaction-based styling, all rendered as vectors in the browser.

Read more about Justin's project here: http://justinmiller.io/posts/2015/01/20/anatomy-of-a-travel-map/

Monthly meeting of the open source GIS group PDX-OSGeo.

Discussion of all things spatial and open source. Tonight's guest is Katie Urey who will speak to us about SpiderOSM. Street conflation is a long time difficult problem and this is a project that looks very useful. The project gives Portland lots of attention as well.

SpiderOSM is an open source python package for matching segments in one path network, e.g., streets and trails, to corresponding segments in another, based on geography and network connectivity. This allows joining together attribute data from separate sources. Importantly authoritative jurisdictional data can be correlated with the rich, crowd-sourced, user editable and extensible, Open Street Maps data. Multifactor match scoring, allows data to be joined only for high confidence matches.

The initial version of the matcher was coded in early 2014 specifically to combine Open Street Map data with Portland Oregon area jurisdictional data (RLIS) to facilitate pedestrian infrastructure analysis and planning. Since then the code has been refactored into a generally useful python package that installs, via pip, and works on all three major platforms: Mac OSX, Linux and Windows. The code is stable and mature, with version 1.0 just around the corner.

The developer, Michael Arnold, is now focusing on developing applications, and finding users and collaborators. On going projects where help would be very welcome include:

1. The Portland Area Mismatched Name Survery (looking at name mismatches between OSM and RLIS identified by SpiderOSM.) Some folks at TriMet and others at PDOT have begun this project, but there is ALOT to be done!

2. A QGIS Plug-in for spiderOSM. Ryan Peterson has recently begun this project, and would welcome help.

3. Help getting the word out: publicizing spiderOSM online and at appropriate events. Alternately, advice and encouragement in this process. :)

Another opportunity, not yet begun: looking for someone interested in developing an ESRI Plug-in for spiderOSM.

Read more about SpiderOSM

Monthly meeting of the open source GIS group PDX-OSGeo.

Speaker: De'Mel Mojica

Abstract: This talk will be on a general approach to automatically join large-scale, geospatial data across distinct data sets, using a mix between Levenshtein Distance thresholds and Haversine Distance thresholds. This approach permits joining multiple data sets without the need to provide ad hoc normalization conventions for each data resource. In addition, this approach can be generalized beyond a geospatial field and applied any domain which requires joining across two or more non-identical dimensions.

We'll visit a local watering hole afterwards.