Fungsi Analisis pada SIG 1 Learning Outcomes Pada

Fungsi Analisis pada SIG 1

Learning Outcomes Pada akhir pertemuan ini, diharapkan mahasiswa akan mampu : �Menunjukkan fungsi-fungsi analisis dari suatu pemodelan dengan SIG 2

Outline Materi �Materi 1 : Jenis Fungsi Analisis �Materi 2 : Pengukuran dalam SIG �Materi 3 : Perbedaan analisis data Raster dan Vektor �Materi 4 : Permasalahan dalam analisis data 3

Jenis Fungsi Analisis (1) �Reclassification �Buffering �Neighborhood �Integrating data-Map Overlay �Spatial Interpolation �Analysis of Surfaces �Network Analysis 4

Jenis Fungsi Analisis (2) Reclassification : �Usually to produce a new simple code image from a complex original image, is a very useful technique to be used in further analysis. Original class 1. Forest 2. Paddy field 3. ……. 4. Housing 5. ……… Reclassification 1. Green Area…. 2. Red Area…. . 5

Jenis Fungsi Analisis (3) Buffering : �Is used to identify a zone of interest around an entity or set of entities. Buffer zones around : Points Line Area 6

Jenis Fungsi Analisis (4) Neighborhood : �The values of individual cells are altered on the basis of adjacency E. q. : Filtering, will change the value of a cell based on the attributes of neighboring cells. Applying 3 x 3 square filter to recalculate value for cell c 4 (in the right) 6 3 3 2 1 2 2 5 3 3 2 1 1 2 4 3 2 2 2 1 1 1 2 1 0 0 0 a b c d e f Minimum Filter c 4 = 1 Maximum Filter c 4 = 3 Mean Filter c 4 = 1. 89 Modal Filter c 4 = 2 (most frequently occurring class) Diversity Filter c 4 = 3 (number of different classes : 1, 2, 3) 7

Jenis Fungsi Analisis (5) Integrating data-Map Overlay : �Vector Overlay ü Point in Polygon ü Line in Polygon ü Polygon on Polygon �Raster Overlay ü Point in Polygon (using add) ü Line in Polygon (using add) ü Polygon on polygon (Boolean alternative) 8

Jenis Fungsi Analisis (6) Spatial Interpolation : �Local or Global �Exact or approximate �Gradual or Abrupt �Deterministic or stochastic Analysis of Surfaces : • Calculating Slope & Aspect • Visibility Analysis 9

Jenis Fungsi Analisis (7) Network Analysis : �Location-allocation Model �Route Tracing �Quantitative Spatial Analysis �Exploratory & Descriptive Statistics �Predictive Statistics �Prescriptive Statistics 10

Pengukuran dalam SIG �Pengukuran Raster �Length �Pythagorean Distance �Manhattan Distance �Proximity Distance �Perimeter �Area �Pengukuran Vector �Distance �Area 11

Analisis data Raster & Vektor Perbedaan analisis data Raster dan Vektor : - Users need to be aware of the strengths & weakness of different type of GIS (raster & vector). - Have limitations of some of the functions they routinely apply (e. q. length measurements). - GIS analyst should be able to produce useful answers by combining data analysis functions into an analysis scheme. - New analysis tools frequently start out in the academic domain 12

Permasalahan dalam analisis data Permasalahan dalam vector & raster overlay : 1. 2. 3. 4. The modifiable areal unit problem. Ecological fallacy Selecting threshold criteria Visual complexity 13

Penutup �Mahasiswa diharapkan telah mampu menunjukkan fungsi-fungsi analisis dari suatu pemodelan dengan SIG. 14