The influence of observer line geometry on results of visibility analysis

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989100%3A27350%2F12%3A86087048" target="_blank" >RIV/61989100:27350/12:86087048 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.5593/sgem2012/s09.v2034" target="_blank" >http://dx.doi.org/10.5593/sgem2012/s09.v2034</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.5593/sgem2012/s09.v2034" target="_blank" >10.5593/sgem2012/s09.v2034</a>

Jazyk výsledku

angličtina

Název v původním jazyce

The influence of observer line geometry on results of visibility analysis

Popis výsledku v původním jazyce

An analysis of visibility is one of the basic analyses in GIS, where the precision of the input data influence the quality of results. Visible area is determined by observer site, terrain model and used visibility algorithm. In general is observer line presented by a simple polyline, which is roughly generalised. It is brought to account of curve representation in GIS. Another simplification can be used due to computing of visibility acceleration, but it can induce variance of results. For the efficient using of visibility analysis is important to know acceptable degree of observer line generalisation to obtain reliable results and execute the process more efficiently. We accomplished the analysis of influence of observer line geometry on visibility analysis by using focused experiments. The tests were examined with observer lines considering terrain morphology around them - crest lines, fall lines, contours etc. There were used digital terrain model in several levels of a raster resolution. The test was focused on raster based algorithms provided by ArcGIS and GRASS GIS. The evaluation of output visible area was solved by ANOVA. The influence of observer line geometry in results of visibility analysis was not found fundamentally considerable. SGEM2012 All Rights Reserved by the International Multidisciplinary Scientific GeoConference SGEM.

Název v anglickém jazyce

The influence of observer line geometry on results of visibility analysis

Popis výsledku anglicky

An analysis of visibility is one of the basic analyses in GIS, where the precision of the input data influence the quality of results. Visible area is determined by observer site, terrain model and used visibility algorithm. In general is observer line presented by a simple polyline, which is roughly generalised. It is brought to account of curve representation in GIS. Another simplification can be used due to computing of visibility acceleration, but it can induce variance of results. For the efficient using of visibility analysis is important to know acceptable degree of observer line generalisation to obtain reliable results and execute the process more efficiently. We accomplished the analysis of influence of observer line geometry on visibility analysis by using focused experiments. The tests were examined with observer lines considering terrain morphology around them - crest lines, fall lines, contours etc. There were used digital terrain model in several levels of a raster resolution. The test was focused on raster based algorithms provided by ArcGIS and GRASS GIS. The evaluation of output visible area was solved by ANOVA. The influence of observer line geometry in results of visibility analysis was not found fundamentally considerable. SGEM2012 All Rights Reserved by the International Multidisciplinary Scientific GeoConference SGEM.

Druh

D - Stať ve sborníku

CEP obor

JC - Počítačový hardware a software

OECD FORD obor

—

Projekt

—

Návaznosti

N - Vyzkumna aktivita podporovana z neverejnych zdroju

Rok uplatnění

2012

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

12th International Multidisciplinary Scientific GeoConference SGEM 2012 : conference proceedings. Volume I-V

ISBN

—

ISSN

1314-2704

e-ISSN

—

Počet stran výsledku

8

Strana od-do

1177-1184

Název nakladatele

STEF92 Technology Ltd.

Místo vydání

Sofia

Místo konání akce

Albena

Datum konání akce

17. 6. 2012

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

000348532700150