Using strain analysis to test positional precision of cartometric scanning

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00025615%3A_____%2F20%3AN0000036" target="_blank" >RIV/00025615:_____/20:N0000036 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.1201/9780429327025" target="_blank" >https://doi.org/10.1201/9780429327025</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1201/9780429327025" target="_blank" >10.1201/9780429327025</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Using strain analysis to test positional precision of cartometric scanning

Popis výsledku v původním jazyce

In the process of digitizing and publishing old maps, it should be kept in mind that maps created with geodetic or astronomical measurements have their own positioning accuracy. This accuracy is principally affected by an accuracy of measurement, applied cartographic projection, a map scale, used drawing method and so on. The map accuracy is important when we want to extract information about objects in maps and about their relationship. In most cases we want to know how precise the outputs are because it influences our next decisions. Digitization of maps and map atlases should be performed on special scanning devices. A large flatbed scanner is recommended for digitizing old maps because image distortion is minimal due to the scanner's design principles. In the paper, ScannTech cartometric scanner of Proserv company with optical resolution of 800 dpi and also described experi-ence with this large format scanner (A0+) is introduced. The necessary part of the article is devoted to testing its accuracy, which is characterized by the average position error (0.10 mm declared by the manufacturer). Mentioned are also reasons why old maps should not be digitized as documents or books are and why it is important to choose different ap-proach. Factors that have impact on a quality and the accuracy of digitized map are also listed. Major part of the article is given to methods for testing of an accuracy of scanners. It is proposed to use strain analysis to test the positional accuracy of cartometric scanning. The benefits of this new approach are discussed. Test sheets for doing tests are also presented. Results from long-term monitoring are also presented. These results describe behavior of scanners and show how a distortion of digital images (maps) is changing in a time.

Název v anglickém jazyce

Using strain analysis to test positional precision of cartometric scanning

Popis výsledku anglicky

In the process of digitizing and publishing old maps, it should be kept in mind that maps created with geodetic or astronomical measurements have their own positioning accuracy. This accuracy is principally affected by an accuracy of measurement, applied cartographic projection, a map scale, used drawing method and so on. The map accuracy is important when we want to extract information about objects in maps and about their relationship. In most cases we want to know how precise the outputs are because it influences our next decisions. Digitization of maps and map atlases should be performed on special scanning devices. A large flatbed scanner is recommended for digitizing old maps because image distortion is minimal due to the scanner's design principles. In the paper, ScannTech cartometric scanner of Proserv company with optical resolution of 800 dpi and also described experi-ence with this large format scanner (A0+) is introduced. The necessary part of the article is devoted to testing its accuracy, which is characterized by the average position error (0.10 mm declared by the manufacturer). Mentioned are also reasons why old maps should not be digitized as documents or books are and why it is important to choose different ap-proach. Factors that have impact on a quality and the accuracy of digitized map are also listed. Major part of the article is given to methods for testing of an accuracy of scanners. It is proposed to use strain analysis to test the positional accuracy of cartometric scanning. The benefits of this new approach are discussed. Test sheets for doing tests are also presented. Results from long-term monitoring are also presented. These results describe behavior of scanners and show how a distortion of digital images (maps) is changing in a time.

Druh

D - Stať ve sborníku

CEP obor

—

OECD FORD obor

10508 - Physical geography

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2020

Kód důvěrnosti údajů

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

Název statě ve sborníku

Advances and Trends in Geodesy, Cartography and Geoinformatics II

ISBN

978-0-367-34651-5

ISSN

—

e-ISSN

—

Počet stran výsledku

8

Strana od-do

203-210

Název nakladatele

CRC Press/Balkema Taylor & Francis Group

Místo vydání

Schipholweg 107C, 2316XC Leiden, The Netherlands

Místo konání akce

DEMÄNOVSKÁ DOLINA, LOW TATRAS, SLOVAKIA

Datum konání akce

10. 9. 2019

Typ akce podle státní příslušnosti

EUR - Evropská akce

Kód UT WoS článku

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