東華大學圖書館 |

語系: 繁體中文

說明(常見問題)

回圖書館首頁

手機版館藏查詢

登入

回首頁

切換: 標籤 | MARC模式 | ISBD

Automatic extraction of terrain feat...

Lay, Jinn-Guey.

FindBook

Google Book

Amazon

博客來

Automatic extraction of terrain features from digital terrain data: A multi-faceted study.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Automatic extraction of terrain features from digital terrain data: A multi-faceted study./
作者:	Lay, Jinn-Guey.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 1993,
面頁冊數:	177 p.
附註:	Source: Dissertations Abstracts International, Volume: 55-11, Section: A.
Contained By:	Dissertations Abstracts International55-11A.
標題:	Geography. -
電子資源:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9416061
ISBN:	9798641214252

Automatic extraction of terrain features from digital terrain data: A multi-faceted study.
Lay, Jinn-Guey.

Automatic extraction of terrain features from digital terrain data: A multi-faceted study. - Ann Arbor : ProQuest Dissertations & Theses, 1993 - 177 p.

Source: Dissertations Abstracts International, Volume: 55-11, Section: A.

Thesis (Ph.D.)--University of Hawai'i at Manoa, 1993.

This item must not be added to any third party search indexes.

Ridge and valley lines are important terrain features to many scientific endeavors and practical applications. They are extracted manually from topographic maps traditionally. Besides being tedious, the manual process involves much arbitrariness by human interpreters and the results are not repeatable nor consistent. The lack of repeatability and consistence undermines the usefulness of the extracted results. The increasing availability of digital terrain data provides an alternative that may remedy the shortcomings of manual extraction. The automatic delineation of terrain features is a multi-faceted task that is relevant to cognitive issues, terrain modeling, and computer implementation. This research has identified four groups of methods for the extraction of ridge and valley lines. They are: symbolic approach, tracing approach, profiling approach, and hydrological approach. The embedded meaning of ridge and valley lines in each of these methods is investigated. A series of tests are conducted inside computers to evaluate the performance of these methods. A primary investigation on the symbolic method concludes that the difficulty pertaining to the generation of TINs undermines the feasibility of the symbolic approach, thus it is not pursued further. The other three groups of methods have been tested and compared on the basis of the numbers, continuity, agreement, and positional accuracy of the extracted features. It is concluded that the hydrological approach performs the best generally. The hydrological approach, instead of emulating manual interpretation in computers, takes an innovative approach that makes good use of the computational power of modern computers. By defining ridge and valley lines with accumulation values, this method is less sensitive to local terrain variations and extracts a rather continuous and complete result. In contrast, the tracing and profiling methods attempt to emulate manual process in extraction and the outcomes turn out to be not satisfactory. The various performances of the three methods present a notion that direct replication of human knowledge into computers is not necessarily feasible in the development of automatic methods. Several topics for future research are identified and subject to further study.

ISBN: 9798641214252Subjects--Topical Terms:

524010
Geography.

Automatic extraction of terrain features from digital terrain data: A multi-faceted study.
LDR:03445nmm a2200337 4500 001 2282449
005 20211004085035.5
008 220723s1993 ||||||||||||||||| ||eng d
020 $a 9798641214252
035 $a (MiAaPQ)AAI9416061
035 $a AAI9416061
040 $a MiAaPQ $c MiAaPQ
100 1 $a Lay, Jinn-Guey. $3 3561251
245 1 0 $a Automatic extraction of terrain features from digital terrain data: A multi-faceted study.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 1993
300 $a 177 p.
500 $a Source: Dissertations Abstracts International, Volume: 55-11, Section: A.
500 $a Publisher info.: Dissertation/Thesis.
500 $a Advisor: Wingert, Everett A.
502 $a Thesis (Ph.D.)--University of Hawai'i at Manoa, 1993.
506 $a This item must not be added to any third party search indexes.
506 $a This item must not be sold to any third party vendors.
520 $a Ridge and valley lines are important terrain features to many scientific endeavors and practical applications. They are extracted manually from topographic maps traditionally. Besides being tedious, the manual process involves much arbitrariness by human interpreters and the results are not repeatable nor consistent. The lack of repeatability and consistence undermines the usefulness of the extracted results. The increasing availability of digital terrain data provides an alternative that may remedy the shortcomings of manual extraction. The automatic delineation of terrain features is a multi-faceted task that is relevant to cognitive issues, terrain modeling, and computer implementation. This research has identified four groups of methods for the extraction of ridge and valley lines. They are: symbolic approach, tracing approach, profiling approach, and hydrological approach. The embedded meaning of ridge and valley lines in each of these methods is investigated. A series of tests are conducted inside computers to evaluate the performance of these methods. A primary investigation on the symbolic method concludes that the difficulty pertaining to the generation of TINs undermines the feasibility of the symbolic approach, thus it is not pursued further. The other three groups of methods have been tested and compared on the basis of the numbers, continuity, agreement, and positional accuracy of the extracted features. It is concluded that the hydrological approach performs the best generally. The hydrological approach, instead of emulating manual interpretation in computers, takes an innovative approach that makes good use of the computational power of modern computers. By defining ridge and valley lines with accumulation values, this method is less sensitive to local terrain variations and extracts a rather continuous and complete result. In contrast, the tracing and profiling methods attempt to emulate manual process in extraction and the outcomes turn out to be not satisfactory. The various performances of the three methods present a notion that direct replication of human knowledge into computers is not necessarily feasible in the development of automatic methods. Several topics for future research are identified and subject to further study.
590 $a School code: 0085.
650 4 $a Geography. $3 524010
650 4 $a Hydrology. $3 545716
650 4 $a Remote sensing. $3 535394
690 $a 0366
690 $a 0388
690 $a 0799
710 2 $a University of Hawai'i at Manoa. $3 1017511
773 0 $t Dissertations Abstracts International $g 55-11A.
790 $a 0085
791 $a Ph.D.
792 $a 1993
793 $a English
856 4 0 $u https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9416061