OSGeo-Live 7.0 has been released! For this release, geospatial applications have been updated to their latest stable release. OSGeo-Live is a self-contained bootable DVD, USB flash drive and Virtual Machine based upon Ubuntu Linux (version 12.04 LTS). OSGeo-Live is pre-configured with a wide variety of robust open source geospatial software. All applications can be trialled without installing anything on your computer, simply by booting the computer from a DVD or USB drive, or running in a Virtual Machine environment. Each featured package is accompanied by both a publication quality one page descriptive summary and a short tutorial on how to get started using it. more >
Spatial Filtering and Time-dependent Sensor Descriptions for SOS
We are pleased to announce that the 52 ° North SOS 4.0.0 implementation supports two new features: the SOS 2.0 Spatial Filtering Profile and the support for the optional validTime parameter in DescribeSensor requests. Both features will facilitate the modelling, storage and retrieval of mobile sensor data from SOS.
Spatial Filtering Profile
The Spatial Filtering Profile is specified in clause 12 of the SOS 2.0 specification (OGC 12-006). This profile restricts observations to spatial observations which provide a well-defined parameter for the observation location. This parameter carries the sampling geometry of the observation which represents the spatial extent where the observation result applies to and can be targeted by spatial filters. The “Spatial Observation” is defined in the Observation & Measurement 2.0 specification (OGC 10-025) subclause 7.13 and can contain any gml:AbstractGeometry type, such as points, lines or polygons.
OpenSensorSearch – Midterm blog
Introduction
The aim of the OpenSensorSearch project is to provide a fast implementation of a sensor discovery server with the high performance of a Solr back-end. In addition, we are working on harvesting mechanisms for OpenSensorSearch to allow users to write harvesters for their own sensor data sources.
During this first term, I have had frequent contact with my mentors, twice a week on Monday and Friday. We stick to a Scrum-like methodology and rely heavily on test-driven development. The main considerations and tasks during the first half of the project runtime were:
- Testing and extending the existing 52°North Sensor Instance Registry (SIR) implementation: Since the project builds upon the SIR implementation, it must be carefully tested and extended for the OpenSensorSearch implementation.
- Providing fast indexing and retrieving: The metadata indexing shall use the data fields supported by Apache Solr for fast indexing and retrieving.
- Developing easy and open harvesting mechanisms: The harvesting mechanisms must be both easy and open to make it accessible to wide span of developersmore >
Seismic Observations in SOS, Midterm Report
This is the midterm update for my GSOC project to integrate seismic data support in SOS. My progress was relatively slow at the start due to a learning curve related to the SOS code base. I have made a lot of progress recently. My main goal for the midterm milestone was to have the SOS set up as a proxy data source querier that could take requests from the server and return seismic data, in time series and/or event format. I wanted to be able to create my own instance of SOS where it was possible to use operations such as GetCapabilities, DescribeSensor, and GetObservation to pull data and simulate what a user might ask for in the SWE client. For details on this architecture, please refer to the SOS Wikipedia page.more >
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