Automatic Quality Assessment of Gis Data Based on Object Coherence

نویسندگان

  • Christian Becker
  • Martin Pahl
چکیده

Spatially referenced data, stored as Geo Information System (GIS) data is needed for numerous applications like map services or administration. Thus, quality assessment of GIS data is of highest importance. Manual quality checks and updates are very time consuming, therefore support through automatic systems is required. Typically, semi-automatic systems are used to narrow down the list of objects that are getting reviewed in a manual process. Current systems introduce an additional layer of complexity, though. To select objects in a binary decision, the user is asked to define rules and to specify parameters. We present a system that provides a much more flexible selection of objects, without the need of any rules or parameters: Relations between up-to-date remote sensing data and GIS data are automatically identified and described by attributes. To determine a Coherence Model for each GIS feature the attribute space is evaluated using a multivariate Gaussian. Abnormality of GIS objects is determined by calculating the Mahalanobis distance of a GIS object’s attributes to the mean. Evaluation shows that results outperform existing systems improving precision by a factor four. Figure 1: Choropleth map showing continuous evaluation result for GIS objects: (from red (conspicuous) to green (inconspicuous))

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Object-Based Classification of UltraCamD Imagery for Identification of Tree Species in the Mixed Planted Forest

This study is a contribution to assess the high resolution digital aerial imagery for semi-automatic analysis of tree species identification. To maximize the benefit of such data, the object-based classification was conducted in a mixed forest plantation. Two subsets of an UltraCam D image were geometrically corrected using aero-triangulation method. Some appropriate transformations were perfor...

متن کامل

Object-based Verification and Update of a Large-scale Topographic Database

It is well known that there is a growing need for consistent and up-to-date GIS-data at various scales. This paper describes a system for semiautomatic quality assessment and update of an existing large scale topographic database. The necessary reference information is derived from current digital aerial orthophotos with a ground sampling distance of 0.1m via automatic image analysis. The advan...

متن کامل

Assessment of the completeness of Volunteered Geographic Information focusing on building blocks data (Case Study: Tehran metropolis)

Open Street Map (OSM) is currently the largest collection of volunteered geographic data, widely used in many projects as an alternative to or integrated with authoritative data. However, the quality of these data has been one of the obstacles to the widely use of it. In this article, from among the elements related to the quality of volunteered geographic data, we have tried to examine the com...

متن کامل

Mono-temporal Gis Update Assistance System Based on Unsupervised Coherence Analysis and Evolutionary Optimisation

Data in Geo Information Systems (GIS) is used for map services and various applications. Thus, quality assessment on a regular basis is required to keep the data up-to-date. In this paper we focus on one key reasons for updates: incorrect object borders. State of the art systems semi-automatically analyse up-to-date satellite image data to narrow down areas that have to be considered for GIS up...

متن کامل

Automatic Quality Assessment of Gis Road Data Using Aerial Imagery - a Comparison between Bayesian and Evidential Reasoning

This paper describes the framework for automatic quality assessment of existing geo-spatial data. The necessary reference information is derived from up-to-date digital aerial images via automatic object extraction. The focus is on roads, as these are amongst the most frequently changing objects in the landscape. In contrast to existing approaches for quality control of road data, a common and ...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

عنوان ژورنال:

دوره   شماره 

صفحات  -

تاریخ انتشار 2012