Sensor Web, Geoprocessing, Security & GeoRM, Geostatistics, Semantics, 3D, Ilwis, Earth Observation

Extending the geostatistical capabilities of ArcGIS via the R-bridge with R, Shiny and gstat

July 19th, 2017 @ 08:20 by Benedikt Graeler
Posted in 52°North, Geostatistics

Screenshot of ArcGIS along with the interactive kriging Shiny app.

ArcGIS is the central tool to handle and derive geoinformation in many applications. However, the standard kriging capabilities only include a few covariance functions and hide the estimation and fit quality of the semivariogram to a large degree. R is less appealing for working with maps, but features a variety of statistical, i.e. geostatistical, extensions. In this showcase, we exploit the semivariogram modeling and kriging capabilities of the gstat R package. In order to give the user visual control over the estimation procedure and the model selection, we use the Shiny framework to realize an interactive graphical user-interface for the semivariogram fitting step. This tool hides the entire R implementation from the user, but delivers a good deal of the geostatistical power to perform kriging. (more…)

Simple Features for protobuf and others

June 1st, 2017 @ 13:14 by Malith Withanage Don
Posted in 52°North, Communities, Geoprocessing, GSoC, Sensor Web

The Simple Feature Access Specification is a common standard that is widely used in geoinformatics for exchanging spatial features. It defines a common storage and access model for spatial vector geometries used by geographic information systems. Efficient serialization of this spatial data is a vital requirement in Spatial Data Infrastructures and Geoprocessing applications. (more…)

Caching for Sensor Web REST-API

May 31st, 2017 @ 10:13 by Anton Egorov
Posted in 52°North, GSoC, Sensor Web

There are only two hard things in Computer Science: cache invalidation and naming things.

Phil Karlton

Caching is a common technique to improve the response time of a data source. A cache is a temporary storage for a most often acquired data. Caching is widely used in a proxying software such as Squid. The caching of network responses can provide a huge improvement to the response time. The latency of a network resource is much more greater than of a memory or a disk resource [Fig.1]. That’s why the caching is a “must-have” feature of network proxies.

Fig.1 Comparison of a memory and network latency

(more…)

52°North @ Firmenlauf 2017

March 24th, 2017 @ 11:09 by Ann Hitchcock
Posted in 52°North

In spite of the dampness and cool temperatures, it was actually great running weather for this year’s Firmenlauf this past Saturday. 52°North showed up with 2 teams for the 5k race. Once again we had some great results! Team 1 came in eighth among the Mixed Teams and Team 2 finished with an honorable 85th place among the Men’s Teams (see results below)!

Congrats to all!!! (more…)

Handbook of best practices for open ocean fixed observatories

March 7th, 2017 @ 16:11 by Christoph Stasch
Posted in 52°North, Communities, Sensor Web

The FixO3 project has recently published the “Handbook of best practices for open ocean fixed observatories”. It describes optimal ways for users to implement fixed stations in an open ocean region. Download the handbook for free.

(more…)

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