ΤΕΙ Ιονίων Νήσων - Εργαστηριακές Ασκήσεις στα Γεωγραφικά Συστήματα Πληροφοριών

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1 ): ): site: search criteria) ｨC site register login Data Search Landsat Archive ( Landsat) L8 OLI/TIRS ( Landsat 8), L7 ETM (2003-present) L7 ( ) L4-5 TM Results Data Set) L8, L7(1), L7(2) L

2 L L7) L8) Next ( L L JULY (downloading Download Options GeoTIFF,

3 (order scene) Landsat 8, L L8, Band Name Landsat 7 Landsat 8 Bandwidth (08m) Resolution (m) Band Name Band 1 Blue 0.45 ｨC Bandwidth (08m) Resolution (m) Band 1 Coastal 0.43 ｨC Band 2 Blue 0.45 ｨC Band 2 Green 0.52 ｨC Band 3 Green 0.53 ｨC Band 3 Red 0.63 ｨC Band 4 Red 0.64 ｨC Band 4 NIR 0.77 ｨC Band 5 SWIR ｨC Band 5 NIR 0.85 ｨC Band 6 SWIR ｨC Band 7 SWIR ｨC Band 7 SWIR ｨC Band 8 Pan 0.52 ｨC Band 8 Pan 0.50 ｨC Band 6 TIR ｨC /60 Band 9 Cirrus 1.36 ｨC Band 10 TIRS ｨC Band 11 TIRS ｨC

4 , 4, Landsat Landsat 8 Landsat 7 Landsat 5 Landsat 8 Color Infrared: 4, 3, 2 5,4,3 Natural Color: 3, 2, 1 4,3,2 False Color: 5,4,3 6,5,4 False Color: 7,5,3 7,6,4 False Color: 7,4,2 7,5,3 O

5 L _BQA L (Landsat) C (Combined) 8 ( ( row ｨC path) 2013 ( LGN00 ( B1 ( ?? ENVI ｭ Open External File >> Landsat >> GeoTiff B7. 14

6 Basic Tools >> Layer Stacking Projection UTM Datum WGS84, Import File ) L8_Pelop_ SOSOS 15

7 Band 1 Coastal 0.43 ｨC 0.45 = 0,44 Band 2 Blue 0.45 ｨC 0.51 = 0,48 Band 3 Green 0.53 ｨC 0.59 = 0,56 Band 4 Red 0.64 ｨC 0.67 = 0,655 Band 5 NIR 0.85 ｨC 0.88 = 0,865 Band 6 SWIR ｨC 1.65 = 1,61 Band 7 SWIR ｨC 2.29 = 2,2 1 nanometer =0.001 micrometers nm = 0,44 mm available list) Edit Header >> Edit attributes >> Wavelengths Micrometers Nanometers micrometers RGB ) ENVI,

8 WGS 1984) File >> Open Vector File Shapefile (*.shp) *.evf) Load selected Display 1, Vector parameters)

9 Vector parameters File >Export active layer to ROI Available Vectors List >> Export Layers to ROI ROI evf ROI, Display Basic Display Mask Definition >> Options >> Import ROIs Import EVFs Apply Avialable bands list

10 ｨC Basic tools >> Apply mask ( Mask value = Spatial Subset ROI EVF Full Scene Landsat 7)

11 ): ｨC , ( ) " " , , (image subtraction) , , ( (1) (2) ( ) , ( , ( ), ( , , (spectral ratioing) , , Landsat MSS Band-7 ( ,1 mm) ( , ,7 mm) , , , ,

12 , ( ) , , , (NDVI), Advanced Very High Resolution Radiometer (AVHRR) NOAA , Landsat MSS ( , (principal components analysis) ( ) " " ( , Thematic Mapper (TM), , , Red Edge) red edge). 21

13 NDVI) LAI NIR/RED [NDVI = (NIR - Red) / (NIR + Red)]

14 ｨC ｨC (Spectral ratioing) DN ( DN , PCA DN I = a 11 DN A + a 12 DN B + a 13 DN C + a 14 DN D DN II = a 21 DN A + a 22 DN B + a 23 DN C + a 24 DN D 1 7 DN III = a 31 DN A + a 32 DN B + a 33 DN C + a 34 DN D DN IV = a 41 DN A + a 42 DN B + a 43 DN C + a 44 DN D PCA DN I, -DN IV, - DNs DN A, -DN D -DNs a 11, a 12,,,, a 44 ｨC

15 LandSat GIS_REMOTE LABORATORY > ｭLANDSATS_Envi formats PCA Transform >> Principal Components >> Forward PC Rotation >> Compute New Statistic and Rotate ｨC Spectral subset, ｨC Spatial Subset Select Mask Band sta), Covariance Correlation matrix 3) PCA ( ｨC eigenvalues)

16 Availabe List (PC Bands) PCA True color RGB PCA PCA PCA RGB PCA Layer stacking

17 NDVI NDVI Transform >> NDVI RED IR IR ( Lansat IR RED Landsat IR RED R Near IR ) Byte Output Data Type >> Spectral >> Vegetation analysis >> Vegetation Index Calculation Landsat NDVI Simple Ratio = RED/IR). * NVI Landsat 8) NDVI NDVI ｨCcomposite (R=IR band, G=NDVI, B =Green Band). NDVI NDVI - RGB 26

18 Landsat ｨC ｨC True color PCA ｨC 2000 (2005), 1984 ｨC ｨC RGB

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