Comparison of the quality of thalweg lines extracted from data of DMR 4G, DMR 5G and its derivatives

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60460709%3A41330%2F24%3A101650" target="_blank" >RIV/60460709:41330/24:101650 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.scopus.com/inward/record.uri?eid=2-s2.0-85208934943&doi=10.46555%2fVTEI.2024.01.001&partnerID=40&md5=6b18c8369267035bc18cee789a4a8b41" target="_blank" >https://www.scopus.com/inward/record.uri?eid=2-s2.0-85208934943&doi=10.46555%2fVTEI.2024.01.001&partnerID=40&md5=6b18c8369267035bc18cee789a4a8b41</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.46555/VTEI.2024.01.001" target="_blank" >10.46555/VTEI.2024.01.001</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Comparison of the quality of thalweg lines extracted from data of DMR 4G, DMR 5G and its derivatives

Popis výsledku v původním jazyce

Determining the gradient of watercourses in the case of local applications is a common problem, which is most often dealt with by geodetic surveying. However, determining the gradient of all watercourses in the Czech Republic is a challenge. The use of geodetic methods on such a scale is usually unrealistic. Therefore, it is necessary to choose a different approach, such as the extraction of the gradient lines from other already existing elevation data. The DMR 4G and DMR 5G are elevation models currently available for the Czech Republic. For the extraction of gradient lines, it is necessary to create a digital terrain model (DTM) from the available datasets. Various interpolation methods are used for this. But which of the available interpolation methods is the most suit-able? What role does the size of spatial resolution play in the quality of altimetry representation and subsequent sizes of the stored DTMs? To find answers to these questions, we chose four study sites (fourth order catchments) in the Otava river basin. Eight different DTMs were then created at each site, which were then compared. The results show that choice of raster size has a significantly greater influence on the resulting quality of the gradient lines than the choice of interpolation method in the case of DTM creation from DMR 5G data. DTM from DMR 4G data gives worse results than from DMR 5G at the same raster resolution.

Název v anglickém jazyce

Comparison of the quality of thalweg lines extracted from data of DMR 4G, DMR 5G and its derivatives

Popis výsledku anglicky

Determining the gradient of watercourses in the case of local applications is a common problem, which is most often dealt with by geodetic surveying. However, determining the gradient of all watercourses in the Czech Republic is a challenge. The use of geodetic methods on such a scale is usually unrealistic. Therefore, it is necessary to choose a different approach, such as the extraction of the gradient lines from other already existing elevation data. The DMR 4G and DMR 5G are elevation models currently available for the Czech Republic. For the extraction of gradient lines, it is necessary to create a digital terrain model (DTM) from the available datasets. Various interpolation methods are used for this. But which of the available interpolation methods is the most suit-able? What role does the size of spatial resolution play in the quality of altimetry representation and subsequent sizes of the stored DTMs? To find answers to these questions, we chose four study sites (fourth order catchments) in the Otava river basin. Eight different DTMs were then created at each site, which were then compared. The results show that choice of raster size has a significantly greater influence on the resulting quality of the gradient lines than the choice of interpolation method in the case of DTM creation from DMR 5G data. DTM from DMR 4G data gives worse results than from DMR 5G at the same raster resolution.

Druh

J_SC - Článek v periodiku v databázi SCOPUS

CEP obor

—

OECD FORD obor

10511 - Environmental sciences (social aspects to be 5.7)

Projekt

—

Návaznosti

S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2024

Kód důvěrnosti údajů

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

Název periodika

Vodohospodářské technicko-ekonomické informace

ISSN

0322-8916

e-ISSN

0322-8916

Svazek periodika

66

Číslo periodika v rámci svazku

2

Stát vydavatele periodika

CZ - Česká republika

Počet stran výsledku

5

Strana od-do

4-9

Kód UT WoS článku

—

EID výsledku v databázi Scopus

2-s2.0-85208934943