1 / 16

Mapping Afghanistan Irrigated Areas with MODIS NDVI

Mapping Afghanistan Irrigated Areas with MODIS NDVI. Michael Budde , Md. Shahriar Pervez, James Rowland US Geological Survey – EROS. Methodology. 4-step Process Step 1 Classify grassland/rangeland Classify forest Terrain characterization Step 2 Build a mask using step 1 outputs

gypsy
Télécharger la présentation

Mapping Afghanistan Irrigated Areas with MODIS NDVI

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Mapping Afghanistan Irrigated Areas with MODIS NDVI Michael Budde, Md. Shahriar Pervez, James Rowland US Geological Survey – EROS

  2. Methodology • 4-step Process • Step 1 • Classify grassland/rangeland • Classify forest • Terrain characterization • Step 2 • Build a mask using step 1 outputs • Identify potential agricultural areas by applying the mask • Step 3 • Develop rules for the decision tree model • Step 4 • Evaluation

  3. Spectral signatures for various land cover types

  4. Identify spectral signatures for grassland/forest classes Grassland Forest

  5. + + = Develop and apply non-agriculture mask Grassland Forest Slope > 20 % Potential Agricultural Land – Peak NDVI (21 Mar – 24 May)

  6. Mask compared to 1993 land cover – upper Helmand 1993 land cover overlaid on 2000 - 1stseason peak NDVI

  7. Develop decision tree rules • Peak NDVI of the following time periods • FS = 1st season : Period 6 to 10 (Mar 21 – May 24) • SS = 2nd season : Period 14 to 18 (Jul 27 – Oct 15) • MS = Middle : Period 11 to 13 (Jun 9 – Jul 11) • TIN= Time Integrated NDVI : Period 7 to 16 (Apr 6 to Aug 28) 1st season 2nd season FS & SS > MS MS < FS > 0.35 1700 > TIN > 1300 FS & SS > MS + 5% 1700 > TIN > 1300 TIN Decision Tree Bi-modal Irrigated 1st Season Irrigated MS < SS > 0.35 1700 > TIN > 1300 N Y 2nd Season Irrigated N Y Y • Thresholds are set by comparison with base year of 2004 Google Earth imagery Y

  8. Results comparing 2000 vs 2011 – increased irrigation 2000 : Irrigated Area 2011 : Irrigated Area

  9. Visual comparisons with Landsat Irrigated Area From MODIS: 2000 False color Landsat 5: Mar 21, 2000

  10. Visual comparisons with Landsat Irrigated Area From MODIS : 2010 False color Landsat 5: Apr 1, 2010

  11. Irrigated areas from Landsat False color Landsat 5: Apr 1, 2010 NDVI > 0.45 and K < 311 • DN to Reflectance to NDVI • DN to Kelvin (thermal band) • Only in areas with at least 3 scenes available between March and August • Irrigated: IF criteria met in any one of three Landsat scenes between Mar & Aug

  12. Area comparison Limited to areas with Landsat scenes for both seasons • MODIS at 250m • Landsat at 30m • 18 polygons – delineate irrigated areas from both image sources • Total irrigated area extracted at each polygon

  13. Landsat/MODIS Irrigated Areas (2000 & 2010) 2000 2010

  14. Time evolution of irrigated areas Cereals include Wheat, Milled Rice, Maize and Barley – FAO 2011 Report

  15. Time evolution of irrigated areas for select provinces

  16. Thank you

More Related