Abstract
Abstract. Recent developments in spatial data infrastructures have enabled real time GIS analysis and visualization using open input data sources and service interfaces. In this study we present a new concept where metric point clouds derived from national open airborne laser scanning (ALS) and photogrammetric image data are processed, analyzed, finally visualised a through open service interfaces to produce user-driven analysis products from targeted areas. The concept is demonstrated in three environmental applications: assessment of forest storm damages, assessment of volumetric changes in open pit mine and 3D city model visualization. One of the main objectives was to study the usability and requirements of national level photogrammetric imagery in these applications. The results demonstrated that user driven 3D geospatial analyses were possible with the proposed approach and current technology, for instance, the landowner could assess the amount of fallen trees within his property borders after a storm easily using any web browser. On the other hand, our study indicated that there are still many uncertainties especially due to the insufficient standardization of photogrammetric products and processes and their quality indicators.
Highlights
There exists globally a great need for 3D environmental model information
The free data include for example the national airborne laser scanning (ALS) data as well as orthophotos that are used for production of national topographic database
We have introduced a novel concept to process and analyze Finnish geospatial data sets, and visualised the resulting 3D environmental models in standard web browsers using open Web Graphics Library (WebGL) technology
Summary
There exists globally a great need for 3D environmental model information. Applications such as city planning, disaster management and environmental monitoring benefit from accurate 3D information. An increasing trend in many countries is that the national topographic data sets are offered for free use. In Finland, the data by the National Land Survey of Finland were opened in May 2012. The free data include for example the national airborne laser scanning (ALS) data as well as orthophotos that are used for production of national topographic database. Open data sources enable new possibilities for both public and commercial services, that make use of geospatial data infrastructures. Source data for terrain and building models: ALS city.
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