Land Use Change Detection Using Satellite Imagery

Transcription

1 Land Use Change Detection Using Satellite Imagery Chi-Farn Chen Center for Space and Remote Sensing Research National Central University TAIWAN Tel : Fax : cfchen@csrsr.ncu.edu.tw 1

2 Land cover / Land use Change Detection in Taiwan TAIWAN Area: 36,000 sq km Landscape: 2/3 are mountains and hills Population: 23,000,000, 90% reside in west coastal plants 2

3 Land cover / Land use Change Detection in Taiwan Illegal activities of land use is inevitable. Land use monitoring heavily depends on patrolmen that is labor-intensive and inefficient for a large-scale operation. For the purpose of sustainable development, the government becomes aware of that the land use management needs the aid of remote sensing technology. 3

4 Land cover / Land use Change Detection in Taiwan A joint project to monitor the land use has been conducted by : Center for Space and Remote Sensing Research National Central University National Land Surveying and Mapping Center Ministry of Interior ( 整合營建署 水利署 水保局土地利用監測的業務 ) 4

5 Land cover / Land use Change Detection in Taiwan The system integrates multi-temporal images with GIS The main objective is to use the remote sensing images to detect the land use changes every two month on a national scale. 5

6 FORMOSAT-2 Satellite Satellite Spectral Range Resolution Period Coverage Height FS-2 (μm) (m) (day) (km 2 ) (km) Multispectral 1.B G R NIR daily 24 X Panchromatic

7 FORMOSAT-2 Orbits over Taiwan 7

8 SPOT Satellite Satellite Spectral Range Resolution Period Coverage Height SPOT 5 (μm) (m) (day) (km 2 ) (km) Multispectral 1.G R NIR SWIR / X Panchromatic /2.5 8

9 SPOT Orbits over Taiwan 9

10 Multi-temporal Images Image at Time 1 Image at Time 2 1. the detection of changes 2. the notification of change information 3. the field investigation of change spots 10

11 Infrastructure The system basically consists of three sub-systems: Land Change Detection System Web-based Land Change Reporting System Digital Field Investigation System 11

12 Infrastructure 12

13 Land Change Detection System Basic DIP functions Change detection capability Editing functions Output 13

14 Land Change Detection System FUNCTIONS SYSTEM MANAGEMENT OPERATION SETTING IMAGE MANAGEMENT BATCH LAYOUT STATISTICS 14

15 Land Change Detection System 5400 map frames with scale of 1/

16 Image Pre-Processing Image Acquisition Raw Image Image Catalogue Level-1A Image Ortho-Rectified Image (Level-4) Fusion of XS and PAN Registration of Multi-temporal images 16

17 Land Change Detection System Change detection:1. computer processing Threshold of Histogram Matching Change Detection Using Histogram Matching(HM) 17

18 Land Change Detection System Image at Time 1 Image at Time 2 HM Result of Image at Time 2 White Areas are the Changes 18

19 Land Change Detection System Change detection:2. manual editing (with supplementary GIS data : land use map, topo. maps with differential scales, aerial photos, etc.) 19

20 Land Change Detection System The supplementary GIS data used for manual editing Land use map 1/5,000 Topo. map 1/25,000 Topo. map Slop map Aerial photo Land development permitted map 20 20

21 Land Change Detection System Computer Processing Manual Editing Aerial Photo Land Use Map Tour Guide Map Land change inside the campus of a college NO notification 21

22 Land Change Detection System Computer Processing Manual Editing Aerial Photo Land Use Map Tour Guide Map Land development in the farm land Notification 22

23 Land Change Detection System End editing 23

24 Land Change Detection System Output based on 1/5000 scale map 5400 map frames with scale of 1/

25 Land Change Detection System Output Change spot on Image at Time 1 Change spot on Image at Time 2 25

26 Land Change Detection System Output Digital map Aerial photo Change spot 26

27 Land Change Detection System Output Change spot on Image at Time 1 Change spot on Image at Time 2 Change spot on Digital map Change spot on Aerial photo 27

28 Web-based Land Change Reporting System Declare the changed spots through internet Report the survey results through internet 28

29 Web-based Land Change Reporting System Change Detection System Web-based Reporting System County Township 29

30 Web-based Land Change Reporting System Notices of change spots by Information of Change Spots Investigation Notices 30

31 Web-based Land Change Reporting System Web-base GIS system 31

32 Web-based Land Change Reporting System Download change spot s maps Prior Satellite Digital Map Aerial Photo Subsequent Satellite Google Earth (KML) 32

33 Digital Field Investigation System GPS, digital camera and digital maps Smartphone Apps Aid Field Investigation GPS Digital Camera Smartphone 33

34 Field Investigation Using GPS, Digital Maps Lead the way to the change spot Judge the legality of the use of the land 34

35 Field Investigation Report Through Web-based Land Change Reporting System Report the survey results through internet : text 35

36 Field Investigation Report Report the survey results through internet : picture 36

37 Digital Field Investigation System Smartphone Apps for : Aiding Field Investigation Land Change Reporting 37

38 Digital Field Investigation System Search 國土監測查報 for ios and Android Apple Store Google Play 38

39 Digital Field Investigation System User interface 39

40 Digital Field Investigation System Download Geospatial Data Navigation Information 40

41 Digital Field Investigation Report Through Smartphone Apps Record / Upload Survey Result Coordinates are automatically tagged on photos 41

42 Inspection Progress Report s progress can be inspect through Web-based Land Change Reporting System 42

43 Change Area No. Name of Map H 永安 Prior Data 05/14/2012 Subsequent Data 08/20/2012 Prior Image Field Investigation Report 1/10 Subsequent Image Change Type Description New Building Result Illegal New temple under construction Photo 43

44 Change Area No. Name of Map F 八里 Prior Data 05/25/2012 Subsequent Data 07/02/2012 Prior Image Field Investigation Report 2/10 Subsequent Image Change Type Description New Building Result New build factory Photo Illegal 44

45 Change Area No. Name of Map T 西勢村 Prior Data 06/03/2013 Subsequent Data 07/17/2013 Prior Image Field Investigation Report 3/10 Subsequent Image Change Type Description New Building Result Illegal Illegal farm house Photo 45

46 Change Area No. Name of Map T 載興 Prior Data 05/27/2013 Subsequent Data 07/10/2013 Prior Image Field Investigation Report 4/10 Subsequent Image Change Type Description Water Body Result Illegal fish pond Photo Illegal 46

47 Change Area No. Name of Map U 大和 Prior Data 11/27/2013 Subsequent Data 01/31/2014 Prior Image Field Investigation Report 5/10 Subsequent Image Change Type Description New Road Result New constructed road Photo Illegal 47

48 Change Area No. Name of Map Q 三界埔 Prior Data 02/06/2011 Subsequent Data 04/02/2011 Prior Image Field Investigation Report 6/10 Subsequent Image Change Type Description Grading Result Illegal Industrial waste Photo 48

49 Change Area No. Name of Map N 梧鳳 Prior Data 06/03/2013 Subsequent Data 07/17/2013 Prior Image Field Investigation Report 7/10 Subsequent Image Change Type Description Grading Result Illegal Cement pavement Photo 49

50 Change Area No. Name of Map N 永靖 Prior Data 11/27/2013 Subsequent Data 01/18/2014 Prior Image Field Investigation Report 8/10 Subsequent Image Change Type Description New Building Result Illegal Market and parking lot Photo 50

51 Change Area No. Name of Map F 湊角山 Prior Data 11/09/2013 Subsequent Data 01/30/2014 Prior Image Field Investigation Report 9/10 Subsequent Image Change Type Description Grading Result Illegal Fruit tree in forest land area Photo 51

52 Field Investigation Report 10/10 Change Area No. Name of Map F 橫溪 Prior Data 04/16/2013 Subsequent Data 07/14/2013 Prior Image Subsequent Image Change Type Description New Building Result Illegal Illegal building for recycling use Photo 52

53 Statistics of The average rate of investigation report is over 98% The average ratio of illegal land usage is near 28% 53

54 Volunteer Reporting System Web-based GIS system for volunteer to report suspicious spots (legal? or illegal?) 54

55 Volunteer Reporting System Report suspicious spot by text and photos Description of suspicious spot Locate suspicious spot and feedback coordinates to system Upload photos of suspicious spot 55

56 Volunteer Reporting System Progress report system for suspicious spot investigation 56

57 Volunteer Reporting System 1/4 Change Area No. V9503 Name of Map Prior Data 1/18/2006 Subsequent Data 3/11/2006 Prior Image Subsequent Image Change Type Description Bare Land Result Legal 94 年 12 月 27 日府農保字 C 號函核准之開挖案件 Photo 57

58 Volunteer Reporting System 2/4 Change Area No. V9706 Name of Map Change Type Bare Land Result Illegal Prior Data 2/16/2008 Subsequent Data 5/14/2008 Prior Image Subsequent Image Description 疑似低漥地填土, 人工機具開墾山坡地 Photo 58

59 Volunteer Reporting System 3/4 Change Area No. V9707 Name of Map Prior Data 12/21/2007 Subsequent Data 6/10/2008 Prior Image Subsequent Image Change Type Description Crop Changed Result Illegal 本案變異點之土地占用本轄立霧溪事業區 67 林班地種植蔬菜, 現在靠近台 14 甲線之土地, 為空地, 本案目前已移送民事訴訟繫屬中地 Photo 59

60 Volunteer Reporting System 4/4 Change Area No Name of Map Prior Data 9/09/2008 Subsequent Data 10/26/2008 Prior Image Subsequent Image Change Type Description Bare Land Result Illegal 經 97 年 11 月 26 日農業處水土保持科主辦會勘, 確認現場為山坡地未經許可整地, 已由該處依違反水土保持法規定辦理中 Photo 60

61 Conclusion Dynamic information is important for a successful land management policy 61

62 Thank You For Listening